ICM20948.c File Reference

Advanced funcions to control and read data from the ICM-20948. More...

#include "ICM20948.h"
#include "em_device.h"
#include "em_chip.h"
#include "em_cmu.h"
#include "em_gpio.h"
#include "em_usart.h"
#include "debug_dbprint.h"
#include "delay.h"
#include <stdint.h>
#include "pinout.h"
#include "timer.h"
#include "I2C.h"
#include "em_i2c.h"
#include "i2cspm.h"
#include "em_core.h"
#include "em_wdog.h"
#include "rtcdriver.h"
#include "em_rtc.h"
#include "bsp.h"

Include dependency graph for ICM20948.c:

Go to the source code of this file.

Macros
#define	M_PI   3.14159265358979323846

Functions
void	ICM_20948_Init ()
	Init function for ICM20948. More...
void	ICM_20948_Init2 ()
	Second init function for ICM20948, use when waking from sleep. More...
void	ICM_20948_Init_SPI ()
	Initiate SPI functionality for ICM20948. More...
void	ICM_20948_enable_SPI (bool enable)
	Enables the necessary SPI interface to communicate with ICM20948. More...
void	ICM_20948_power (bool enable)
	Turns the GPIO pin high to provide power to the ICM20948. More...
void	ICM_20948_printAllData ()
	Print all gyro + accel + magn data using dbprint. More...
void	ICM_20948_check_WhoAmI ()
	Check WhoAmI register of ICM20948. More...
void	ICM_20948_chipSelectSet (bool enable)
	Set chipselect pin for SPI functionality. More...
void	ICM_20948_bankSelect (uint8_t bank)
	Select appropriate bank in ICM20948 based on first bits of address. More...
uint8_t	ICM_20948_read (uint16_t addr)
	Read single register from IMU using SPI. More...
void	ICM_20948_registerRead (uint16_t addr, int numBytes, uint8_t *data)
	Read registers from IMU. More...
void	ICM_20948_registerWrite (uint16_t addr, uint8_t data)
	Writes registers from IMU. More...
uint32_t	ICM_20948_sleepModeEnable (bool enable)
	Sleep mode enable function. More...
uint32_t	ICM_20948_reset (void)
	Reset IMU. More...
uint32_t	ICM_20948_gyroDataRead (float *gyro)
	Read gyroscope data from IMU. More...
uint32_t	ICM_20948_gyroResolutionGet (float *gyroRes)
	Set gyro resolution. More...
uint32_t	ICM_20948_interruptStatusRead (uint32_t *intStatus)
	Read staus of interrupt IMU. More...
uint32_t	ICM_20948_interruptEnable (bool dataReadyEnable, bool womEnable)
	Enable interrupt for data ready or wake on motion. More...
uint32_t	ICM_20948_sampleRateSet (float sampleRate)
	Combination function to set sample rate of gyro and accel at once. More...
float	ICM_20948_gyroSampleRateSet (float sampleRate)
	Sets the gyro sample rate. More...
float	ICM_20948_accelSampleRateSet (float sampleRate)
	Sets the accelerometer sample rate. More...
uint32_t	ICM_20948_lowPowerModeEnter (bool enAccel, bool enGyro, bool enTemp)
	Enter low power mode for selected sensors. More...
uint32_t	ICM_20948_sensorEnable (bool accel, bool gyro, bool temp)
	Enable selected sensors. More...
uint32_t	ICM_20948_cycleModeEnable (bool enable)
	Enable cycle mode on IMU. More...
uint32_t	ICM_20948_accelDataRead (float *accel)
	Read RAW accelerometer data. More...
uint32_t	ICM_20948_accelResolutionGet (float *accelRes)
	Get accelerometer resultion. More...
uint32_t	ICM_20948_accelFullscaleSet (uint8_t accelFs)
	Set accelerometer full scale range. More...
uint32_t	ICM_20948_gyroFullscaleSet (uint8_t gyroFs)
	Set gyroscope full scale range. More...
uint32_t	ICM_20948_wakeOnMotionITEnable (bool enable, uint8_t womThreshold, float sampleRate)
	Set wake on motion interrupt. More...
uint32_t	ICM_20948_gyroBandwidthSet (uint8_t gyroBw)
	Set gyroscope bandwidth. More...
uint32_t	ICM_20948_accelBandwidthSet (uint8_t accelBw)
	Set acceleromter bandwidth. More...
uint32_t	ICM_20948_latchEnable (bool enable)
	Enables / disables the 50 micro seconds interrupt pin functionality. More...
void	ICM_20948_set_mag_transfer (bool read)
	Set magnetometer data transfer on integrated I2C controller inside ICM20948. More...
void	waitForSlave4 ()
	Wait for I2C slave (internal I2C controller on ICM20948) More...
unsigned char	readMagRegister (unsigned char magreg)
	Read magnetometer register from I2C controller in ICM20948. More...
void	writeMagRegister (unsigned char magreg, unsigned char val)
	Write magnetometer register using internal I2C interface on ICM20948. More...
void	ICM_20948_read_mag_register (uint8_t addr, uint8_t numBytes, uint8_t *data)
	Read register in the AK09916 magnetometer device. More...
void	ICM_20948_write_mag_register (uint8_t addr, uint8_t data)
	Writes a uint8_t to the I2C address of the magnetometer of the ICM_20948. More...
uint32_t	ICM_20948_set_mag_mode (uint8_t magMode)
	Set magnetometer mode (sample rate / on-off) More...
void	ICM_20948_magRawDataRead (float *raw_magn)
	Read magnetometer raw values. More...
void	ICM_20948_magDataRead (float *magn)
	Convert raw magnetometer values to calibrated and scaled ones. More...
uint32_t	ICM_20948_reset_mag (void)
	Reset magnetometer. More...
void	ICM_20948_magn_to_angle (float *magn, float *angle)
	Test function for non-tilt compensated compass. More...
uint32_t	ICM_20948_accelGyroCalibrate (float *accelBiasScaled, float *gyroBiasScaled)
	Accelerometer and gyroscope calibration function. Reads the gyroscope and accelerometer values while the device is at rest and in level. The resulting values are loaded to the accel and gyro bias registers to cancel the static offset error. More...
uint32_t	ICM_20948_gyroCalibrate (float *gyroBiasScaled)
	Gyroscope calibration function. Reads the gyroscope values while the device is at rest and in level. The resulting values are loaded to the gyro bias registers to cancel the static offset error. More...
uint32_t	ICM_20948_min_max_mag (int16_t *minMag, int16_t *maxMag)
	Calculate minimum and maximum magnetometer values, which are used for calibration. More...
bool	ICM_20948_calibrate_mag (float *offset, float *scale)
	Magnetometer calibration function. Get magnetometer minimum and maximum values, while moving the device in a figure eight. Those values are then used to cancel out hard and soft iron distortions. More...

Variables
bool	ICM_20948_Initialized = false
int32_t	mag_minimumRange = 40
float	mag_res = 4912.0f / 32752.0f
int16_t	_hxcounts
int16_t	_hycounts
int16_t	_hzcounts
int16_t	tX [3] = {1, 0, 0}
int16_t	tY [3] = {0, -1, 0}
int16_t	tZ [3] = {0, 0, -1}
float	_hx
float	_hy
float	_hz
float	accRawScaling = 32767.5f
float	gyroRawScaling = 32767.5f
float	magRawScaling = 32767.5f
float	_magScale = (4912.0f) / (32767.5f)
bool	IMU_MEASURING

Detailed Description

Advanced funcions to control and read data from the ICM-20948.

Partly copied from silabs thunderboard code for ICM-20689, partly self written

Version

1.0

Author

Jona Cappelle

Definition in file ICM20948.c.

Macro Definition Documentation

M_PI

#define M_PI   3.14159265358979323846

Declaration of PI as a constant, used for conversion angle <--> rad

Definition at line 41 of file ICM20948.c.

Function Documentation

ICM_20948_accelBandwidthSet()

uint32_t ICM_20948_accelBandwidthSet

(

uint8_t

accelBw

)

Set acceleromter bandwidth.

Parameters

[in]

accelBw

bandwidth, see datasheet for permitted values

Definition at line 1376 of file ICM20948.c.

{
  uint8_t reg;
 
  /* Read the GYRO_CONFIG_1 register */
  ICM_20948_registerRead(ICM_20948_REG_ACCEL_CONFIG, 1, &reg);
  reg &= ~(ICM_20948_MASK_ACCEL_BW);
 
  /* Write the new bandwidth value to the gyro config register */
  reg |= (accelBw & ICM_20948_MASK_ACCEL_BW);
  ICM_20948_registerWrite(ICM_20948_REG_ACCEL_CONFIG, reg);
 
  return ICM_20948_OK;
}

References ICM_20948_MASK_ACCEL_BW, ICM_20948_OK, ICM_20948_REG_ACCEL_CONFIG, ICM_20948_registerRead(), and ICM_20948_registerWrite().

Referenced by ICM_20948_accelGyroCalibrate(), and ICM_20948_wakeOnMotionITEnable().

ICM_20948_accelDataRead()

uint32_t ICM_20948_accelDataRead

(

float *

accel

)

Read RAW accelerometer data.

Parameters

[out]

accel

pointer to resulting memory locaion

Returns

OK when done

Definition at line 1170 of file ICM20948.c.

{
  uint8_t rawData[6];
  float accelRes;
  int16_t temp;
 
  /* Retrieve the current resolution */
  ICM_20948_accelResolutionGet(&accelRes);
 
  /* Read the six raw data registers into data array */
  ICM_20948_registerRead(ICM_20948_REG_ACCEL_XOUT_H_SH, 6, &rawData[0]);
 
  /* Convert the MSB and LSB into a signed 16-bit value and multiply by the resolution to get the G value */
  temp = ( (int16_t) rawData[0] << 8) | rawData[1];
  accel[0] = (float) temp * accelRes;
  temp = ( (int16_t) rawData[2] << 8) | rawData[3];
  accel[1] = (float) temp * accelRes;
  temp = ( (int16_t) rawData[4] << 8) | rawData[5];
  accel[2] = (float) temp * accelRes;
 
  return ICM_20948_OK;
}

References ICM_20948_accelResolutionGet(), ICM_20948_OK, ICM_20948_REG_ACCEL_XOUT_H_SH, and ICM_20948_registerRead().

Referenced by measure_send().

ICM_20948_accelFullscaleSet()

uint32_t ICM_20948_accelFullscaleSet

(

uint8_t

accelFs

)

Set accelerometer full scale range.

Parameters

[in]

accelFs

full scale range, see datasheet for permitted values

Definition at line 1242 of file ICM20948.c.

{
  uint8_t reg;
 
  accelFs &= ICM_20948_MASK_ACCEL_FULLSCALE;
  ICM_20948_registerRead(ICM_20948_REG_ACCEL_CONFIG, 1, &reg);
  reg &= ~(ICM_20948_MASK_ACCEL_FULLSCALE);
  reg |= accelFs;
  ICM_20948_registerWrite(ICM_20948_REG_ACCEL_CONFIG, reg);
 
  return ICM_20948_OK;
}

References ICM_20948_MASK_ACCEL_FULLSCALE, ICM_20948_OK, ICM_20948_REG_ACCEL_CONFIG, ICM_20948_registerRead(), and ICM_20948_registerWrite().

Referenced by ICM_20948_accelGyroCalibrate(), ICM_20948_Init2(), and ICM_20948_wakeOnMotionITEnable().

ICM_20948_accelGyroCalibrate()

uint32_t ICM_20948_accelGyroCalibrate	(	float *	accelBiasScaled,
		float *	gyroBiasScaled
	)

Accelerometer and gyroscope calibration function. Reads the gyroscope and accelerometer values while the device is at rest and in level. The resulting values are loaded to the accel and gyro bias registers to cancel the static offset error.

Parameters

[out]	accelBiasScaled	The mesured acceleration sensor bias in mg
[out]	gyroBiasScaled	The mesured gyro sensor bias in deg/sec

Returns

Returns zero on OK, non-zero otherwise

Definition at line 1820 of file ICM20948.c.

{
  uint8_t data[12];
  uint16_t i, packetCount, fifoCount;
  int32_t gyroBias[3] = { 0, 0, 0 };
  int32_t accelBias[3] = { 0, 0, 0 };
  int32_t accelTemp[3];
  int32_t gyroTemp[3];
  int32_t accelBiasFactory[3];
  int32_t gyroBiasStored[3];
  float gyroRes, accelRes;
 
  /* Enable the accelerometer and the gyro */
  ICM_20948_sensorEnable(true, true, false);
 
  /* Set 1kHz sample rate */
  ICM_20948_sampleRateSet(1100.0);
 
  /* 246Hz BW for the accelerometer and 200Hz for the gyroscope */
  ICM_20948_accelBandwidthSet(ICM_20948_ACCEL_BW_246HZ);
  ICM_20948_gyroBandwidthSet(ICM_20948_GYRO_BW_12HZ);
 
  /* Set the most sensitive range: 2G full scale and 250dps full scale */
  ICM_20948_accelFullscaleSet(ICM_20948_ACCEL_FULLSCALE_2G);
  ICM_20948_gyroFullscaleSet(ICM_20948_GYRO_FULLSCALE_250DPS);
 
  /* Retrieve the resolution per bit */
  ICM_20948_accelResolutionGet(&accelRes);
  ICM_20948_gyroResolutionGet(&gyroRes);
 
  /* The accel sensor needs max 30ms, the gyro max 35ms to fully start */
  /* Experiments show that the gyro needs more time to get reliable results */
  delay(50);
 
  /* Disable the FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_USER_CTRL, ICM_20948_BIT_FIFO_EN);
  ICM_20948_registerWrite(ICM_20948_REG_FIFO_MODE, 0x0F);
 
  /* Enable accelerometer and gyro to store the data in FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_FIFO_EN_2, ICM_20948_BIT_ACCEL_FIFO_EN | ICM_20948_BITS_GYRO_FIFO_EN);
 
  /* Reset the FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_FIFO_RST, 0x0F);
  ICM_20948_registerWrite(ICM_20948_REG_FIFO_RST, 0x00);
 
  /* Enable the FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_USER_CTRL, ICM_20948_BIT_FIFO_EN);
 
  /* The max FIFO size is 4096 bytes, one set of measurements takes 12 bytes */
  /* (3 axes, 2 sensors, 2 bytes each value ) 340 samples use 4080 bytes of FIFO */
  /* Loop until at least 4080 samples gathered */
  fifoCount = 0;
  while ( fifoCount < 4080 ) {
    delay(5);
    /* Read FIFO sample count */
    ICM_20948_registerRead(ICM_20948_REG_FIFO_COUNT_H, 2, &data[0]);
    /* Convert to a 16 bit value */
    fifoCount = ( (uint16_t) (data[0] << 8) | data[1]);
  }
 
  /* Disable accelerometer and gyro to store the data in FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_FIFO_EN_2, 0x00);
 
  /* Read FIFO sample count */
  ICM_20948_registerRead(ICM_20948_REG_FIFO_COUNT_H, 2, &data[0]);
 
  /* Convert to a 16 bit value */
  fifoCount = ( (uint16_t) (data[0] << 8) | data[1]);
 
  /* Calculate the number of data sets (3 axis of accel an gyro, two bytes each = 12 bytes) */
  packetCount = fifoCount / 12;
 
  /* Retrieve the data from the FIFO */
  for ( i = 0; i < packetCount; i++ ) {
    ICM_20948_registerRead(ICM_20948_REG_FIFO_R_W, 12, &data[0]);
    /* Convert to 16 bit signed accel and gyro x,y and z values */
    accelTemp[0] = ( (int16_t) (data[0] << 8) | data[1]);
    accelTemp[1] = ( (int16_t) (data[2] << 8) | data[3]);
    accelTemp[2] = ( (int16_t) (data[4] << 8) | data[5]);
    gyroTemp[0] = ( (int16_t) (data[6] << 8) | data[7]);
    gyroTemp[1] = ( (int16_t) (data[8] << 8) | data[9]);
    gyroTemp[2] = ( (int16_t) (data[10] << 8) | data[11]);
 
    /* Sum the values */
    accelBias[0] += accelTemp[0];
    accelBias[1] += accelTemp[1];
    accelBias[2] += accelTemp[2];
    gyroBias[0] += gyroTemp[0];
    gyroBias[1] += gyroTemp[1];
    gyroBias[2] += gyroTemp[2];
  }
 
  /* Divide by packet count to get the average */
  accelBias[0] /= packetCount;
  accelBias[1] /= packetCount;
  accelBias[2] /= packetCount;
  gyroBias[0] /= packetCount;
  gyroBias[1] /= packetCount;
  gyroBias[2] /= packetCount;
 
  /* Acceleormeter: add or remove (depending on the orientation of the chip) 1G (gravity) from the Z axis value */
  if ( accelBias[2] > 0L ) {
    accelBias[2] -= (int32_t) (1.0 / accelRes);
  } else {
    accelBias[2] += (int32_t) (1.0 / accelRes);
  }
 
  /* Convert the values to degrees per sec for displaying */
  gyroBiasScaled[0] = (float) gyroBias[0] * gyroRes;
  gyroBiasScaled[1] = (float) gyroBias[1] * gyroRes;
  gyroBiasScaled[2] = (float) gyroBias[2] * gyroRes;
 
  /* Read stored gyro trim values. After reset these values are all 0 */
  ICM_20948_registerRead(ICM_20948_REG_XG_OFFS_USRH, 2, &data[0]);
  gyroBiasStored[0] = ( (int16_t) (data[0] << 8) | data[1]);
  ICM_20948_registerRead(ICM_20948_REG_YG_OFFS_USRH, 2, &data[0]);
  gyroBiasStored[1] = ( (int16_t) (data[0] << 8) | data[1]);
  ICM_20948_registerRead(ICM_20948_REG_ZG_OFFS_USRH, 2, &data[0]);
  gyroBiasStored[2] = ( (int16_t) (data[0] << 8) | data[1]);
 
  /* The gyro bias should be stored in 1000dps full scaled format. We measured in 250dps to get */
  /* the best sensitivity, so need to divide by 4 */
  /* Substract from the stored calibration value */
  gyroBiasStored[0] -= gyroBias[0] / 4;
  gyroBiasStored[1] -= gyroBias[1] / 4;
  gyroBiasStored[2] -= gyroBias[2] / 4;
 
  /* Split the values into two bytes */
  data[0] = (gyroBiasStored[0] >> 8) & 0xFF;
  data[1] = (gyroBiasStored[0]) & 0xFF;
  data[2] = (gyroBiasStored[1] >> 8) & 0xFF;
  data[3] = (gyroBiasStored[1]) & 0xFF;
  data[4] = (gyroBiasStored[2] >> 8) & 0xFF;
  data[5] = (gyroBiasStored[2]) & 0xFF;
 
  /* Write the  gyro bias values to the chip */
  ICM_20948_registerWrite(ICM_20948_REG_XG_OFFS_USRH, data[0]);
  ICM_20948_registerWrite(ICM_20948_REG_XG_OFFS_USRL, data[1]);
  ICM_20948_registerWrite(ICM_20948_REG_YG_OFFS_USRH, data[2]);
  ICM_20948_registerWrite(ICM_20948_REG_YG_OFFS_USRL, data[3]);
  ICM_20948_registerWrite(ICM_20948_REG_ZG_OFFS_USRH, data[4]);
  ICM_20948_registerWrite(ICM_20948_REG_ZG_OFFS_USRL, data[5]);
 
  /* Calculate the accelerometer bias values to store in the hardware accelerometer bias registers. These registers contain */
  /* factory trim values which must be added to the calculated accelerometer biases; on boot up these registers will hold */
  /* non-zero values. In addition, bit 0 of the lower byte must be preserved since it is used for temperature */
  /* compensation calculations(? the datasheet is not clear). Accelerometer bias registers expect bias input */
  /* as 2048 LSB per g, so that the accelerometer biases calculated above must be divided by 8. */
 
  /* Read factory accelerometer trim values */
  ICM_20948_registerRead(ICM_20948_REG_XA_OFFSET_H, 2, &data[0]);
  accelBiasFactory[0] = ( (int16_t) (data[0] << 8) | data[1]);
  ICM_20948_registerRead(ICM_20948_REG_YA_OFFSET_H, 2, &data[0]);
  accelBiasFactory[1] = ( (int16_t) (data[0] << 8) | data[1]);
  ICM_20948_registerRead(ICM_20948_REG_ZA_OFFSET_H, 2, &data[0]);
  accelBiasFactory[2] = ( (int16_t) (data[0] << 8) | data[1]);
 
  /* Construct total accelerometer bias, including calculated average accelerometer bias from above */
  /* Scale the 2g full scale (most sensitive range) results to 16g full scale - divide by 8 */
  /* Clear the last bit (temperature compensation? - the datasheet is not clear) */
  /* Substract from the factory calibration value */
 
  accelBiasFactory[0] -= ( (accelBias[0] / 8) & ~1);
  accelBiasFactory[1] -= ( (accelBias[1] / 8) & ~1);
  accelBiasFactory[2] -= ( (accelBias[2] / 8) & ~1);
 
  /* Split the values into two bytes */
  data[0] = (accelBiasFactory[0] >> 8) & 0xFF;
  data[1] = (accelBiasFactory[0]) & 0xFF;
  data[2] = (accelBiasFactory[1] >> 8) & 0xFF;
  data[3] = (accelBiasFactory[1]) & 0xFF;
  data[4] = (accelBiasFactory[2] >> 8) & 0xFF;
  data[5] = (accelBiasFactory[2]) & 0xFF;
 
  /* Store them in the accelerometer offset registers */
  ICM_20948_registerWrite(ICM_20948_REG_XA_OFFSET_H, data[0]);
  ICM_20948_registerWrite(ICM_20948_REG_XA_OFFSET_L, data[1]);
  ICM_20948_registerWrite(ICM_20948_REG_YA_OFFSET_H, data[2]);
  ICM_20948_registerWrite(ICM_20948_REG_YA_OFFSET_L, data[3]);
  ICM_20948_registerWrite(ICM_20948_REG_ZA_OFFSET_H, data[4]);
  ICM_20948_registerWrite(ICM_20948_REG_ZA_OFFSET_L, data[5]);
 
  /* Convert the values to G for displaying */
  accelBiasScaled[0] = (float) accelBias[0] * accelRes;
  accelBiasScaled[1] = (float) accelBias[1] * accelRes;
  accelBiasScaled[2] = (float) accelBias[2] * accelRes;
 
  /* Turn off FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_USER_CTRL, 0x00);
 
  /* Disable all sensors */
  ICM_20948_sensorEnable(false, false, false);
 
  return ICM_20948_OK;
}

References data, delay(), ICM_20948_ACCEL_BW_246HZ, ICM_20948_ACCEL_FULLSCALE_2G, ICM_20948_accelBandwidthSet(), ICM_20948_accelFullscaleSet(), ICM_20948_accelResolutionGet(), ICM_20948_BIT_ACCEL_FIFO_EN, ICM_20948_BIT_FIFO_EN, ICM_20948_BITS_GYRO_FIFO_EN, ICM_20948_GYRO_BW_12HZ, ICM_20948_GYRO_FULLSCALE_250DPS, ICM_20948_gyroBandwidthSet(), ICM_20948_gyroFullscaleSet(), ICM_20948_gyroResolutionGet(), ICM_20948_OK, ICM_20948_REG_FIFO_COUNT_H, ICM_20948_REG_FIFO_EN_2, ICM_20948_REG_FIFO_MODE, ICM_20948_REG_FIFO_R_W, ICM_20948_REG_FIFO_RST, ICM_20948_REG_USER_CTRL, ICM_20948_REG_XA_OFFSET_H, ICM_20948_REG_XA_OFFSET_L, ICM_20948_REG_XG_OFFS_USRH, ICM_20948_REG_XG_OFFS_USRL, ICM_20948_REG_YA_OFFSET_H, ICM_20948_REG_YA_OFFSET_L, ICM_20948_REG_YG_OFFS_USRH, ICM_20948_REG_YG_OFFS_USRL, ICM_20948_REG_ZA_OFFSET_H, ICM_20948_REG_ZA_OFFSET_L, ICM_20948_REG_ZG_OFFS_USRH, ICM_20948_REG_ZG_OFFS_USRL, ICM_20948_registerRead(), ICM_20948_registerWrite(), ICM_20948_sampleRateSet(), and ICM_20948_sensorEnable().

Referenced by ICM_20948_Init().

ICM_20948_accelResolutionGet()

uint32_t ICM_20948_accelResolutionGet

(

float *

accelRes

)

Get accelerometer resultion.

Parameters

[out]

accelRes

pointer to accelerometer resulution

Definition at line 1202 of file ICM20948.c.

{
  uint8_t reg;
 
  /* Read the actual acceleration full scale setting */
  ICM_20948_registerRead(ICM_20948_REG_ACCEL_CONFIG, 1, &reg);
  reg &= ICM_20948_MASK_ACCEL_FULLSCALE;
 
  /* Calculate the resolution */
  switch ( reg ) {
    case ICM_20948_ACCEL_FULLSCALE_2G:
      *accelRes = 2.0 / 32768.0;
      break;
 
    case ICM_20948_ACCEL_FULLSCALE_4G:
      *accelRes = 4.0 / 32768.0;
      break;
 
    case ICM_20948_ACCEL_FULLSCALE_8G:
      *accelRes = 8.0 / 32768.0;
      break;
 
    case ICM_20948_ACCEL_FULLSCALE_16G:
      *accelRes = 16.0 / 32768.0;
      break;
  }
 
  return ICM_20948_OK;
}

References ICM_20948_ACCEL_FULLSCALE_16G, ICM_20948_ACCEL_FULLSCALE_2G, ICM_20948_ACCEL_FULLSCALE_4G, ICM_20948_ACCEL_FULLSCALE_8G, ICM_20948_MASK_ACCEL_FULLSCALE, ICM_20948_OK, ICM_20948_REG_ACCEL_CONFIG, and ICM_20948_registerRead().

Referenced by ICM_20948_accelDataRead(), and ICM_20948_accelGyroCalibrate().

ICM_20948_accelSampleRateSet()

float ICM_20948_accelSampleRateSet

(

float

sampleRate

)

Sets the accelerometer sample rate.

will automatically calculate a sample rate that fits the sample rate divider register

Parameters

[in/out]

sampleRate desired sample rate

Returns

the actual sample rate

Definition at line 988 of file ICM20948.c.

{
  uint16_t accelDiv;
  float accelSampleRate;
 
  /* Calculate the sample rate divider */
  accelSampleRate = (1125.0 / sampleRate) - 1.0;
 
  /* Check if it fits in the divider registers */
  if ( accelSampleRate > 4095.0 ) {
    accelSampleRate = 4095.0;
  }
 
  if ( accelSampleRate < 0 ) {
    accelSampleRate = 0.0;
  }
 
  /* Write the value to the registers */
  accelDiv = (uint16_t) accelSampleRate;
  ICM_20948_registerWrite(ICM_20948_REG_ACCEL_SMPLRT_DIV_1, (uint8_t) (accelDiv >> 8) );
  ICM_20948_registerWrite(ICM_20948_REG_ACCEL_SMPLRT_DIV_2, (uint8_t) (accelDiv & 0xFF) );
 
  /* Calculate the actual sample rate from the divider value */
  accelSampleRate = 1125.0 / (accelDiv + 1);
 
  return accelSampleRate;
}

References ICM_20948_REG_ACCEL_SMPLRT_DIV_1, ICM_20948_REG_ACCEL_SMPLRT_DIV_2, and ICM_20948_registerWrite().

Referenced by ICM_20948_sampleRateSet().

ICM_20948_bankSelect()

void ICM_20948_bankSelect

(

uint8_t

bank

)

Select appropriate bank in ICM20948 based on first bits of address.

Note

Works only with I2C

wBuffer[0] = ICM_20948_REG_BANK_SEL; wBuffer[1] = (bank << 4);

Parameters

[in]

bank

Register to be read

Definition at line 528 of file ICM20948.c.

{
    uint8_t wBuffer[2];
    wBuffer[0] = ICM_20948_REG_BANK_SEL;
    wBuffer[1] = (bank << 4);
 
    IIC_WriteBuffer(ICM_20948_I2C_ADDRESS, wBuffer, 2);
}

References ICM_20948_I2C_ADDRESS, ICM_20948_REG_BANK_SEL, and IIC_WriteBuffer().

Referenced by ICM_20948_read(), ICM_20948_registerRead(), and ICM_20948_registerWrite().

ICM_20948_calibrate_mag()

bool ICM_20948_calibrate_mag	(	float *	offset,
		float *	scale
	)

Magnetometer calibration function. Get magnetometer minimum and maximum values, while moving the device in a figure eight. Those values are then used to cancel out hard and soft iron distortions.

Magnetometer calibration function. Get magnetometer minimum and maximum values, while moving the device in a figure eight. Those values are then used to cancel out hard and soft iron distortions.

Parameters

[out]	offset	Magnetometer XYZ axis hard iron distortion correction.
[out]	scale	Magnetometer XYZ axis soft iron distortion correction.

Returns

'true' if successful, 'false' on error.

Definition at line 2289 of file ICM20948.c.

                                                          {
    int16_t minMag[3];
    int16_t maxMag[3];
    int32_t sum_mx, sum_my, sum_mz;
    int32_t dif_mx, dif_my, dif_mz, dif_m;
 
//    /* Reset hard and soft iron correction before calibration. */
    _hxb = 0.0f;
    _hyb = 0.0f;
    _hzb = 0.0f;
    _hxs = 1.0f;
    _hys = 1.0f;
    _hzs = 1.0f;
 
//    DEBUG_PRINTLN(F("Calibrating magnetometer. Move the device in a figure eight ..."));
 
    ICM_20948_min_max_mag( minMag, maxMag );
 
    sum_mx = (int32_t) maxMag[0] + minMag[0];
    sum_my = (int32_t) maxMag[1] + minMag[1];
    sum_mz = (int32_t) maxMag[2] + minMag[2];
 
    dif_mx = (int32_t) maxMag[0] - minMag[0];
    dif_my = (int32_t) maxMag[1] - minMag[1];
    dif_mz = (int32_t) maxMag[2] - minMag[2];
 
    offset[0] = -0.5f * sum_mx;
    offset[1] = -0.5f * sum_my;
    offset[2] = -0.5f * sum_mz;
 
    dif_m = (dif_mx + dif_my + dif_mz) / 3;
 
    scale[0] = (float) dif_m / dif_mx;
    scale[1] = (float) dif_m / dif_my;
    scale[2] = (float) dif_m / dif_mz;
 
//    Store offset values in local variables, to be accessable by magread functions
    _hxb = offset[0];
    _hyb = offset[1];
    _hzb = offset[2];
 
    _hxs = scale[0];
    _hys = scale[1];
    _hzs = scale[2];
 
 
//    DEBUG_PRINTLN(F("Hard iron correction values (center values):"));
//    DEBUG_PRINT2(offset_mx, 1);
//    DEBUG_PRINT("\t");
//    DEBUG_PRINT2(offset_my, 1);
//    DEBUG_PRINT("\t");
//    DEBUG_PRINT2(offset_mz, 1);
//    DEBUG_PRINT("\t");
//    DEBUG_PRINTLN();
//
//    DEBUG_PRINTLN(F("Soft iron correction values (scale values):"));
//    DEBUG_PRINT2(scale_mx, 4);
//    DEBUG_PRINT("\t");
//    DEBUG_PRINT2(scale_my, 4);
//    DEBUG_PRINT("\t");
//    DEBUG_PRINT2(scale_mz, 4);
//    DEBUG_PRINTLN();
 
    return true;
}

Referenced by ICM_20948_Init().

ICM_20948_check_WhoAmI()

void ICM_20948_check_WhoAmI

(

)

Check WhoAmI register of ICM20948.

Note

Hangs when WhoAmI is not found or is not correct

Definition at line 459 of file ICM20948.c.

{
    uint8_t WhoAmI;
    while( WhoAmI != 0xEA )
    {
        WhoAmI = ICM_20948_read( ICM_20948_BANK_0 | 0x00 );
    }
}

References ICM_20948_BANK_0, and ICM_20948_read().

ICM_20948_chipSelectSet()

void ICM_20948_chipSelectSet

(

bool

enable

)

Set chipselect pin for SPI functionality.

Only when using SPI

Parameters

[in]

enable

'true' - CS pin high 'false' - CS pin low

Definition at line 480 of file ICM20948.c.

{
    if ( enable )
    {
        /* Set CS low (active low) to start transmission */
        GPIO_PinOutClear(ICM_20948_CS_PORT, ICM_20948_CS_PIN);
    }
    else
    {
        /* Set CS high (active low) */
        GPIO_PinOutSet(ICM_20948_CS_PORT, ICM_20948_CS_PIN);
    }
}

References ICM_20948_CS_PIN, and ICM_20948_CS_PORT.

Referenced by ICM_20948_read().

ICM_20948_cycleModeEnable()

uint32_t ICM_20948_cycleModeEnable

(

bool

enable

)

Enable cycle mode on IMU.

Parameters

[in/out]

enable 'true' - enable cycle mode 'false' - disable cycle mode

Definition at line 1142 of file ICM20948.c.

{
  uint8_t reg;
 
  reg = 0x00;
 
  if ( enable ) {
    reg = ICM_20948_BIT_ACCEL_CYCLE | ICM_20948_BIT_GYRO_CYCLE;
  }
 
  ICM_20948_registerWrite(ICM_20948_REG_LP_CONFIG, reg);
 
  return ICM_20948_OK;
}

References ICM_20948_BIT_ACCEL_CYCLE, ICM_20948_BIT_GYRO_CYCLE, ICM_20948_OK, ICM_20948_REG_LP_CONFIG, and ICM_20948_registerWrite().

Referenced by ICM_20948_lowPowerModeEnter(), and ICM_20948_wakeOnMotionITEnable().

ICM_20948_enable_SPI()

void ICM_20948_enable_SPI

(

bool

enable

)

Enables the necessary SPI interface to communicate with ICM20948.

Note

SPI can draw some power

SPI is not used

By setting the GPIO's to 0 state when going to sleep 150 micro A <--> 270 micro A

Parameters

[in]

enable

true - Enable SPI communication. false - Disable SPI communication.

Definition at line 344 of file ICM20948.c.

{
    if (enable)
    {
        /* Enable USART clock and peripheral */
        CMU_ClockEnable(cmuClock_USART0, true);
 
        USART_Enable(USART0, usartEnable);
 
        /* Configure GPIO */
        /* In the case of gpioModePushPull", the last argument directly sets the pin state */
        GPIO_PinModeSet(ICM_20948_CLK_PORT, ICM_20948_CLK_PIN, gpioModePushPull, 0); // US0_CLK is push pull
        /* Normally this is gpioPortE: pin 13 */
        /* Apparently, can't use the US0_CS port (PE13) to manually set/clear CS line */
        GPIO_PinModeSet(ICM_20948_CS_PORT, ICM_20948_CS_PIN, gpioModePushPull, 1); // US0_CS is push pull
        GPIO_PinModeSet(ICM_20948_MISO_PORT, ICM_20948_MISO_PIN, gpioModeInput, 1);    // US0_RX (MISO) is input
        GPIO_PinModeSet(ICM_20948_MOSI_PORT, ICM_20948_MOSI_PIN, gpioModePushPull, 1); // US0_TX (MOSI) is push pull
    }
    else
    {
        /* Disable USART clock and peripheral */
        CMU_ClockEnable(cmuClock_USART0, false);
 
        USART_Enable(USART0, usartDisable);
 
        /* Configure GPIO */
        /* In the case of gpioModePushPull", the last argument directly sets the pin state */
        GPIO_PinModeSet(ICM_20948_CLK_PORT, ICM_20948_CLK_PIN, gpioModeDisabled, 0); // US0_CLK is push pull
        /* Normally this is gpioPortE: pin 13 */
        /* Apparently, can't use the US0_CS port (PE13) to manually set/clear CS line */
        GPIO_PinModeSet(ICM_20948_CS_PORT, ICM_20948_CS_PIN, gpioModeDisabled, 1); // US0_CS is push pull
        GPIO_PinModeSet(ICM_20948_MISO_PORT, ICM_20948_MISO_PIN, gpioModeDisabled, 1);    // US0_RX (MISO) is input
        GPIO_PinModeSet(ICM_20948_MOSI_PORT, ICM_20948_MOSI_PIN, gpioModeDisabled, 1); // US0_TX (MOSI) is push pull
 
    }
}

References ICM_20948_CLK_PIN, ICM_20948_CLK_PORT, ICM_20948_CS_PIN, ICM_20948_CS_PORT, ICM_20948_MISO_PIN, ICM_20948_MISO_PORT, ICM_20948_MOSI_PIN, and ICM_20948_MOSI_PORT.

ICM_20948_gyroBandwidthSet()

uint32_t ICM_20948_gyroBandwidthSet

(

uint8_t

gyroBw

)

Set gyroscope bandwidth.

Parameters

[in]

gyroBw

bandwidth, see datasheet for permitted values

Definition at line 1352 of file ICM20948.c.

{
  uint8_t reg;
 
  /* Read the GYRO_CONFIG_1 register */
  ICM_20948_registerRead(ICM_20948_REG_GYRO_CONFIG_1, 1, &reg);
  reg &= ~(ICM_20948_MASK_GYRO_BW);
 
  /* Write the new bandwidth value to the gyro config register */
  reg |= (gyroBw & ICM_20948_MASK_GYRO_BW);
  ICM_20948_registerWrite(ICM_20948_REG_GYRO_CONFIG_1, reg);
 
  return ICM_20948_OK;
}

References ICM_20948_MASK_GYRO_BW, ICM_20948_OK, ICM_20948_REG_GYRO_CONFIG_1, ICM_20948_registerRead(), and ICM_20948_registerWrite().

Referenced by ICM_20948_accelGyroCalibrate(), and ICM_20948_gyroCalibrate().

ICM_20948_gyroCalibrate()

uint32_t ICM_20948_gyroCalibrate

(

float *

gyroBiasScaled

)

Gyroscope calibration function. Reads the gyroscope values while the device is at rest and in level. The resulting values are loaded to the gyro bias registers to cancel the static offset error.

Parameters

[out]

gyroBiasScaled

The mesured gyro sensor bias in deg/sec

Returns

Returns zero on OK, non-zero otherwise

Definition at line 2031 of file ICM20948.c.

{
  uint8_t data[12];
  uint16_t i, packetCount, fifoCount;
  int32_t gyroBias[3] = { 0, 0, 0 };
  int32_t gyroTemp[3];
  int32_t gyroBiasStored[3];
  float gyroRes;
 
  /* Enable the accelerometer and the gyro */
  ICM_20948_sensorEnable(true, true, false);
 
  /* Set 1kHz sample rate */
  ICM_20948_sampleRateSet(1100.0);
 
  /* Configure bandwidth for gyroscope to 12Hz */
  ICM_20948_gyroBandwidthSet(ICM_20948_GYRO_BW_12HZ);
 
  /* Configure sensitivity to 250dps full scale */
  ICM_20948_gyroFullscaleSet(ICM_20948_GYRO_FULLSCALE_250DPS);
 
  /* Retrieve the resolution per bit */
  ICM_20948_gyroResolutionGet(&gyroRes);
 
  /* The accel sensor needs max 30ms, the gyro max 35ms to fully start */
  /* Experiments show that the gyro needs more time to get reliable results */
  delay(50);
 
  /* Disable the FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_USER_CTRL, ICM_20948_BIT_FIFO_EN);
  ICM_20948_registerWrite(ICM_20948_REG_FIFO_MODE, 0x0F);
 
  /* Enable accelerometer and gyro to store the data in FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_FIFO_EN_2, ICM_20948_BITS_GYRO_FIFO_EN);
 
  /* Reset the FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_FIFO_RST, 0x0F);
  ICM_20948_registerWrite(ICM_20948_REG_FIFO_RST, 0x00);
 
  /* Enable the FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_USER_CTRL, ICM_20948_BIT_FIFO_EN);
 
  /* The max FIFO size is 4096 bytes, one set of measurements takes 12 bytes */
  /* (3 axes, 2 sensors, 2 bytes each value ) 340 samples use 4080 bytes of FIFO */
  /* Loop until at least 4080 samples gathered */
  fifoCount = 0;
  while ( fifoCount < 4080 ) {
    delay(5);
 
    /* Read FIFO sample count */
    ICM_20948_registerRead(ICM_20948_REG_FIFO_COUNT_H, 2, &data[0]);
 
    /* Convert to a 16 bit value */
    fifoCount = ( (uint16_t) (data[0] << 8) | data[1]);
  }
 
  /* Disable accelerometer and gyro to store the data in FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_FIFO_EN_2, 0x00);
 
  /* Read FIFO sample count */
  ICM_20948_registerRead(ICM_20948_REG_FIFO_COUNT_H, 2, &data[0]);
 
  /* Convert to a 16 bit value */
  fifoCount = ( (uint16_t) (data[0] << 8) | data[1]);
 
  /* Calculate the number of data sets (3 axis of accel an gyro, two bytes each = 12 bytes) */
  packetCount = fifoCount / 12;
 
  /* Retrieve the data from the FIFO */
  for ( i = 0; i < packetCount; i++ ) {
    ICM_20948_registerRead(ICM_20948_REG_FIFO_R_W, 12, &data[0]);
    /* Convert to 16 bit signed accel and gyro x,y and z values */
    gyroTemp[0] = ( (int16_t) (data[6] << 8) | data[7]);
    gyroTemp[1] = ( (int16_t) (data[8] << 8) | data[9]);
    gyroTemp[2] = ( (int16_t) (data[10] << 8) | data[11]);
 
    /* Sum the values */
    gyroBias[0] += gyroTemp[0];
    gyroBias[1] += gyroTemp[1];
    gyroBias[2] += gyroTemp[2];
  }
 
  /* Divide by packet count to get the average */
  gyroBias[0] /= packetCount;
  gyroBias[1] /= packetCount;
  gyroBias[2] /= packetCount;
 
  /* Convert the values to degrees per sec for displaying */
  gyroBiasScaled[0] = (float) gyroBias[0] * gyroRes;
  gyroBiasScaled[1] = (float) gyroBias[1] * gyroRes;
  gyroBiasScaled[2] = (float) gyroBias[2] * gyroRes;
 
  /* Read stored gyro trim values. After reset these values are all 0 */
  ICM_20948_registerRead(ICM_20948_REG_XG_OFFS_USRH, 2, &data[0]);
  gyroBiasStored[0] = ( (int16_t) (data[0] << 8) | data[1]);
 
  ICM_20948_registerRead(ICM_20948_REG_YG_OFFS_USRH, 2, &data[0]);
  gyroBiasStored[1] = ( (int16_t) (data[0] << 8) | data[1]);
 
  ICM_20948_registerRead(ICM_20948_REG_ZG_OFFS_USRH, 2, &data[0]);
  gyroBiasStored[2] = ( (int16_t) (data[0] << 8) | data[1]);
 
  /* The gyro bias should be stored in 1000dps full scaled format. We measured in 250dps to get */
  /* the best sensitivity, so need to divide by 4 */
  /* Substract from the stored calibration value */
  gyroBiasStored[0] -= gyroBias[0] / 4;
  gyroBiasStored[1] -= gyroBias[1] / 4;
  gyroBiasStored[2] -= gyroBias[2] / 4;
 
  /* Split the values into two bytes */
  data[0] = (gyroBiasStored[0] >> 8) & 0xFF;
  data[1] = (gyroBiasStored[0]) & 0xFF;
  data[2] = (gyroBiasStored[1] >> 8) & 0xFF;
  data[3] = (gyroBiasStored[1]) & 0xFF;
  data[4] = (gyroBiasStored[2] >> 8) & 0xFF;
  data[5] = (gyroBiasStored[2]) & 0xFF;
 
  /* Write the  gyro bias values to the chip */
  ICM_20948_registerWrite(ICM_20948_REG_XG_OFFS_USRH, data[0]);
  ICM_20948_registerWrite(ICM_20948_REG_XG_OFFS_USRL, data[1]);
  ICM_20948_registerWrite(ICM_20948_REG_YG_OFFS_USRH, data[2]);
  ICM_20948_registerWrite(ICM_20948_REG_YG_OFFS_USRL, data[3]);
  ICM_20948_registerWrite(ICM_20948_REG_ZG_OFFS_USRH, data[4]);
  ICM_20948_registerWrite(ICM_20948_REG_ZG_OFFS_USRL, data[5]);
 
  /* Turn off FIFO */
  ICM_20948_registerWrite(ICM_20948_REG_USER_CTRL, 0x00);
 
  /* Disable all sensors */
  ICM_20948_sensorEnable(false, false, false);
 
  return ICM_20948_OK;
}

References data, delay(), ICM_20948_BIT_FIFO_EN, ICM_20948_BITS_GYRO_FIFO_EN, ICM_20948_GYRO_BW_12HZ, ICM_20948_GYRO_FULLSCALE_250DPS, ICM_20948_gyroBandwidthSet(), ICM_20948_gyroFullscaleSet(), ICM_20948_gyroResolutionGet(), ICM_20948_OK, ICM_20948_REG_FIFO_COUNT_H, ICM_20948_REG_FIFO_EN_2, ICM_20948_REG_FIFO_MODE, ICM_20948_REG_FIFO_R_W, ICM_20948_REG_FIFO_RST, ICM_20948_REG_USER_CTRL, ICM_20948_REG_XG_OFFS_USRH, ICM_20948_REG_XG_OFFS_USRL, ICM_20948_REG_YG_OFFS_USRH, ICM_20948_REG_YG_OFFS_USRL, ICM_20948_REG_ZG_OFFS_USRH, ICM_20948_REG_ZG_OFFS_USRL, ICM_20948_registerRead(), ICM_20948_registerWrite(), ICM_20948_sampleRateSet(), and ICM_20948_sensorEnable().

ICM_20948_gyroDataRead()

uint32_t ICM_20948_gyroDataRead

(

float *

gyro

)

Read gyroscope data from IMU.

Parameters

[out]

gyro

pointer to store data

Definition at line 783 of file ICM20948.c.

{
  uint8_t rawData[6];
  float gyroRes;
  int16_t temp;
 
  /* Retrieve the current resolution */
  ICM_20948_gyroResolutionGet(&gyroRes);
 
  /* Read the six raw data registers into data array */
  ICM_20948_registerRead(GYRO_XOUT_H, 6, &rawData[0]);
 
  /* Convert the MSB and LSB into a signed 16-bit value and multiply by the resolution to get the dps value */
  temp = ( (int16_t) rawData[0] << 8) | rawData[1];
  gyro[0] = (float) temp * gyroRes;
  temp = ( (int16_t) rawData[2] << 8) | rawData[3];
  gyro[1] = (float) temp * gyroRes;
  temp = ( (int16_t) rawData[4] << 8) | rawData[5];
  gyro[2] = (float) temp * gyroRes;
 
  return ICM_20948_OK;
}

References GYRO_XOUT_H, ICM_20948_gyroResolutionGet(), ICM_20948_OK, and ICM_20948_registerRead().

Referenced by measure_send().

ICM_20948_gyroFullscaleSet()

uint32_t ICM_20948_gyroFullscaleSet

(

uint8_t

gyroFs

)

Set gyroscope full scale range.

Parameters

[in]

gyroFs

full scale range, see datasheet for permitted values

Definition at line 1265 of file ICM20948.c.

{
  uint8_t reg;
 
  gyroFs &= ICM_20948_MASK_GYRO_FULLSCALE;
  ICM_20948_registerRead(ICM_20948_REG_GYRO_CONFIG_1, 1, &reg);
  reg &= ~(ICM_20948_MASK_GYRO_FULLSCALE);
  reg |= gyroFs;
  ICM_20948_registerWrite(ICM_20948_REG_GYRO_CONFIG_1, reg);
 
  return ICM_20948_OK;
}

References ICM_20948_MASK_GYRO_FULLSCALE, ICM_20948_OK, ICM_20948_REG_GYRO_CONFIG_1, ICM_20948_registerRead(), and ICM_20948_registerWrite().

Referenced by ICM_20948_accelGyroCalibrate(), ICM_20948_gyroCalibrate(), and ICM_20948_Init2().

ICM_20948_gyroResolutionGet()

uint32_t ICM_20948_gyroResolutionGet

(

float *

gyroRes

)

Set gyro resolution.

Parameters

[in/out]

gyroRes gyro resulution input gyro actual resolution output

Definition at line 817 of file ICM20948.c.

{
  uint8_t reg;
 
  /* Read the actual gyroscope full scale setting */
  ICM_20948_registerRead(ICM_20948_REG_GYRO_CONFIG_1, 1, &reg);
  reg &= ICM_20948_MASK_GYRO_FULLSCALE;
 
  /* Calculate the resolution */
  switch ( reg ) {
    case ICM_20948_GYRO_FULLSCALE_250DPS:
      *gyroRes = 250.0 / 32768.0;
      break;
 
    case ICM_20948_GYRO_FULLSCALE_500DPS:
      *gyroRes = 500.0 / 32768.0;
      break;
 
    case ICM_20948_GYRO_FULLSCALE_1000DPS:
      *gyroRes = 1000.0 / 32768.0;
      break;
 
    case ICM_20948_GYRO_FULLSCALE_2000DPS:
      *gyroRes = 2000.0 / 32768.0;
      break;
  }
 
  return ICM_20948_OK;
}

References ICM_20948_GYRO_FULLSCALE_1000DPS, ICM_20948_GYRO_FULLSCALE_2000DPS, ICM_20948_GYRO_FULLSCALE_250DPS, ICM_20948_GYRO_FULLSCALE_500DPS, ICM_20948_MASK_GYRO_FULLSCALE, ICM_20948_OK, ICM_20948_REG_GYRO_CONFIG_1, and ICM_20948_registerRead().

Referenced by ICM_20948_accelGyroCalibrate(), ICM_20948_gyroCalibrate(), and ICM_20948_gyroDataRead().

ICM_20948_gyroSampleRateSet()

float ICM_20948_gyroSampleRateSet

(

float

sampleRate

)

Sets the gyro sample rate.

will automatically calculate a sample rate that fits the sample rate divider register

Parameters

[in/out]

sampleRate desired sample rate

Returns

the actual sample rate

Definition at line 947 of file ICM20948.c.

{
  uint8_t gyroDiv;
  float gyroSampleRate;
 
  /* Calculate the sample rate divider */
  gyroSampleRate = (1125.0 / sampleRate) - 1.0;
 
  /* Check if it fits in the divider register */
  if ( gyroSampleRate > 255.0 ) {
    gyroSampleRate = 255.0;
  }
 
  if ( gyroSampleRate < 0 ) {
    gyroSampleRate = 0.0;
  }
 
  /* Write the value to the register */
  gyroDiv = (uint8_t) gyroSampleRate;
  ICM_20948_registerWrite(ICM_20948_REG_GYRO_SMPLRT_DIV, gyroDiv);
 
  /* Calculate the actual sample rate from the divider value */
  gyroSampleRate = 1125.0 / (gyroDiv + 1);
 
  return gyroSampleRate;
}

References ICM_20948_REG_GYRO_SMPLRT_DIV, and ICM_20948_registerWrite().

Referenced by ICM_20948_sampleRateSet().

ICM_20948_Init()

void ICM_20948_Init

(

)

Init function for ICM20948.

I2C init Power on IMU Reset IMU Init 2 Calibrate Gyro + Accel Calibrate Magn

Definition at line 85 of file ICM20948.c.

{
    /* Enable GPIO clock in order to set pin states */
    CMU_ClockEnable(cmuClock_HFPER, true);
    CMU_ClockEnable(cmuClock_GPIO, true);
    delay(10);
 
    /* Setup SPI / IIC interface for ICM_20948 */
    /* Comment / Uncomment to select */
    //ICM_20948_Init_SPI();
    IIC_Init();
    delay(10);
 
    /* Power the ICM_20948 */
    ICM_20948_power(true);
    delay(200);
 
    /* Reset ICM_20948, just to be sure */
    ICM_20948_reset();
    delay(100); // 100ms delay needed for reset sequence
 
 
    ICM_20948_Init2();
 
 
#if DIY == 0
    BSP_LedSet(0);
#endif
 
    /* CALIBRATION */
     float accelCal[3];
     float gyroCal[3];
     float magOffset[3];
     float magScale[3];
     ICM_20948_accelGyroCalibrate( accelCal, gyroCal );
 
#if DIY == 0
     BSP_LedClear(0);
#endif
 
#if DIY == 0
    BSP_LedSet(1);
#endif
 
    ICM_20948_Init2();
 
#if DIY == 1
    GPIO_PinModeSet(LED_PORT, LED_PIN, gpioModePushPull, 0);
    GPIO_PinOutSet(LED_PORT, LED_PIN);
#endif
    uint8_t temp[1];
    ICM_20948_set_mag_mode(AK09916_MODE_100HZ);
    delay(100);
    ICM_20948_read_mag_register(0x31, 1, temp);
    ICM_20948_read_mag_register(0x11, 8, temp);
 
    ICM_20948_calibrate_mag( magOffset, magScale );
 
#if DIY == 1
    GPIO_PinOutClear(LED_PORT, LED_PIN);
    GPIO_PinModeSet(LED_PORT, LED_PIN, gpioModeDisabled, 0);
#endif
 
#if DIY == 0
    BSP_LedClear(1);
#endif
 
 
 
 
    ICM_20948_Initialized = true;
}

References AK09916_MODE_100HZ, delay(), ICM_20948_accelGyroCalibrate(), ICM_20948_calibrate_mag(), ICM_20948_Init2(), ICM_20948_Initialized, ICM_20948_power(), ICM_20948_read_mag_register(), ICM_20948_reset(), ICM_20948_set_mag_mode(), IIC_Init(), LED_PIN, and LED_PORT.

ICM_20948_Init2()

void ICM_20948_Init2

(

)

Second init function for ICM20948, use when waking from sleep.

Set sample rates, bandwidths, check whoAmI, enable sensors

Definition at line 169 of file ICM20948.c.

{
 
 
        /* Auto select best available clock source PLL if ready, else use internal oscillator */
        ICM_20948_registerWrite(ICM_20948_REG_PWR_MGMT_1, ICM_20948_BIT_CLK_PLL);
        /* PLL startup time - no spec in data sheet */
        delay(30);
 
        /* Reset I2C Slave module and use SPI */
        /* Enable I2C Master I/F module */                  /* ICM_20948_BIT_I2C_IF_DIS om te vermijden dat toch I2C zal gebruikt worden */
        //ICM_20948_registerWrite(ICM_20948_REG_USER_CTRL, ICM_20948_BIT_I2C_MST_EN);//ICM_20948_BIT_I2C_IF_DIS | ICM_20948_BIT_I2C_MST_EN);
 
        /* Set I2C Master clock frequency */
        //ICM_20948_registerWrite(ICM_20948_REG_I2C_MST_CTRL, ICM_20948_I2C_MST_CTRL_CLK_400KHZ);
 
        uint8_t temp[8];
 
        /* Read ICM20948 "Who am I" register */
        ICM_20948_registerRead(ICM_20948_REG_WHO_AM_I, 1, temp);
 
        /* Check if "Who am I" register was successfully read */
        if (temp[0] == ICM20948_DEVICE_ID) {
    #if DEBUG_DBPRINT == 1 /* DEBUG_DBPRINT */
            dbprint("ICM20948 WHOAMI OKE");
    #endif /* DEBUG_DBPRINT */
 
        }
 
 
 
        /* Make sure ICM_20948 is not in sleep mode */
        ICM_20948_sleepModeEnable( false );
 
        /* Enable all ICM_20948 sensors */
        ICM_20948_sensorEnable(true, true, true);
        delay(10);
 
        /* Set ICM_20948 gyro and accel sample rate to 75Hz */
        ICM_20948_sampleRateSet(50);
 
        /* Set full scale range: gyro & accel */
        ICM_20948_gyroFullscaleSet(ICM_20948_GYRO_FULLSCALE_2000DPS);
        ICM_20948_accelFullscaleSet(ICM_20948_ACCEL_FULLSCALE_4G);
 
        /* Setup 50us interrupt */
        ICM_20948_latchEnable(true);
 
        // TODO: Bandwidth gyro + accel
        // Standard low pass filters are enabled
//      ICM_20948_accelBandwidthSet( ICM_20948_ACCEL_BW_1210HZ );
//      ICM_20948_gyroBandwidthSet( ICM_20948_GYRO_BW_120HZ );
 
        /* Auto select best available clock source PLL if ready, else use internal oscillator */
        ICM_20948_registerWrite(ICM_20948_REG_PWR_MGMT_1, ICM_20948_BIT_CLK_PLL);
        delay(30);
 
 
        /* Magnetometer */
        /* IIC passtrough: magnetometer can be accessed on IIC bus */
        ICM_20948_registerWrite(ICM_20948_REG_INT_PIN_CFG, 0x02);
        delay(10);
 
        /* Reset magnetometer */
        ICM_20948_write_mag_register(0x32, 0x01);
        delay(100); // reset takes 100ms
 
        /* Read AK09916 "Who am I" register */
        ICM_20948_read_mag_register(AK09916_REG_WHO_AM_I, 1, temp);
 
        /* Check if AK09916 "Who am I" register was successfully read */
        if (temp[0] == AK09916_DEVICE_ID) {
    #if DEBUG_DBPRINT == 1 /* DEBUG_DBPRINT */
            dbprint("AK09916 WHOAMI OKE");
    #endif /* DEBUG_DBPRINT */
 
        }
 
        /* Configure magnetometer */
        ICM_20948_set_mag_mode(AK09916_MODE_50HZ);
        delay(10);
 
        ICM_20948_read_mag_register(0x31, 1, temp);
        /* Update data by reading through till ST2 register */
        ICM_20948_read_mag_register(0x11, 8, temp);
 
 
 
 
 
    //  /* Set interrupt to trigger every 100ms when the data is ready */
    //  IMU_MEASURING = true;
    //  ICM_20948_interruptEnable(true, false);
 
}

References AK09916_DEVICE_ID, AK09916_MODE_50HZ, AK09916_REG_WHO_AM_I, dbprint(), delay(), ICM20948_DEVICE_ID, ICM_20948_ACCEL_FULLSCALE_4G, ICM_20948_accelFullscaleSet(), ICM_20948_BIT_CLK_PLL, ICM_20948_GYRO_FULLSCALE_2000DPS, ICM_20948_gyroFullscaleSet(), ICM_20948_latchEnable(), ICM_20948_read_mag_register(), ICM_20948_REG_INT_PIN_CFG, ICM_20948_REG_PWR_MGMT_1, ICM_20948_REG_WHO_AM_I, ICM_20948_registerRead(), ICM_20948_registerWrite(), ICM_20948_sampleRateSet(), ICM_20948_sensorEnable(), ICM_20948_set_mag_mode(), ICM_20948_sleepModeEnable(), and ICM_20948_write_mag_register().

Referenced by ICM_20948_Init().

ICM_20948_Init_SPI()

void ICM_20948_Init_SPI

(

)

Initiate SPI functionality for ICM20948.

Note

SPI not used

Definition at line 273 of file ICM20948.c.

{
 
      /*****************************/
 
      /* Enable necessary clocks */
        CMU_ClockEnable(cmuClock_HFPER, true); /* GPIO and USART0/1 are High Frequency Peripherals */
        CMU_ClockEnable(cmuClock_GPIO, true);
        CMU_ClockEnable(cmuClock_USART0, true);
 
        /* Configure GPIO */
        /* In the case of gpioModePushPull", the last argument directly sets the pin state */
        GPIO_PinModeSet(ICM_20948_CLK_PORT, ICM_20948_CLK_PIN, gpioModePushPull, 0); // US0_CLK is push pull
        /* Normally this is gpioPortE: pin 13 */
        /* Apparently, can't use the US0_CS port (PE13) to manually set/clear CS line */
        GPIO_PinModeSet(ICM_20948_CS_PORT, ICM_20948_CS_PIN, gpioModePushPull, 1); // US0_CS is push pull
        GPIO_PinModeSet(ICM_20948_MISO_PORT, ICM_20948_MISO_PIN, gpioModeInput, 1);    // US0_RX (MISO) is input
        GPIO_PinModeSet(ICM_20948_MOSI_PORT, ICM_20948_MOSI_PIN, gpioModePushPull, 1); // US0_TX (MOSI) is push pull
 
        // Start with default config, then modify as necessary
          USART_InitSync_TypeDef config = USART_INITSYNC_DEFAULT;
          config.master       = true;            // master mode
          //config.baudrate     = 1000000;         // CLK freq is 1 MHz
          config.autoCsEnable = true;            // CS pin controlled by hardware, not firmware
          config.clockMode    = usartClockMode0; // clock idle low, sample on rising/first edge
          config.msbf         = true;            // send MSB first
          config.enable       = usartDisable;    // making sure to keep USART disabled until we've set everything up
 
          /* Modify some settings */
          config.clockMode    = usartClockMode0;    /* clock idle low, sample on rising/first edge (Clock polarity/phase mode = CPOL/CPHA) */
          config.refFreq      = 0;              /* USART/UART reference clock assumed when configuring baud rate setup. Set to 0 to use the currently configured reference clock. */
          config.baudrate     = 4000000;         // CLK freq is 4 MHz
          config.databits     = usartDatabits8; /* master mode */
          config.autoTx = false;                    /* If enabled: Enable AUTOTX mode. Transmits as long as RX is not full. Generates underflows if TX is empty. */
          config.autoCsEnable = false;            /* CS pin controlled by hardware, not firmware */
 
          /* Initialize USART0/1 with the configured parameters */
          USART_InitSync(USART0, &config);
 
          // Set and enable USART pin locations
          USART0->ROUTE = USART_ROUTE_CLKPEN | USART_ROUTE_CSPEN | USART_ROUTE_TXPEN | USART_ROUTE_RXPEN | USART_ROUTE_LOCATION_LOC0;
 
        /* Enable USART0/1 */
        USART_Enable(USART0, usartEnable);
 
        /* Set CS high (active low!) */
        /* Normally this isn't needed, in the case of gpioModePushPull", the last argument directly sets the pin state */
        GPIO_PinOutSet(gpioPortE, 13);
 
 
      /*****************************/
}

References ICM_20948_CLK_PIN, ICM_20948_CLK_PORT, ICM_20948_CS_PIN, ICM_20948_CS_PORT, ICM_20948_MISO_PIN, ICM_20948_MISO_PORT, ICM_20948_MOSI_PIN, and ICM_20948_MOSI_PORT.

ICM_20948_interruptEnable()

uint32_t ICM_20948_interruptEnable	(	bool	dataReadyEnable,
		bool	womEnable
	)

Enable interrupt for data ready or wake on motion.

Parameters

[in]	dataReadyEnable	'true' - enable 'false' - disable
[in]	womEnable	'true' - enable 'false' - disable

Definition at line 885 of file ICM20948.c.

{
  uint8_t intEnable;
 
  /* All interrupts disabled by default */
  intEnable = 0;
 
  /* Enable one or both of the interrupt sources if required */
  if ( womEnable ) {
    intEnable = ICM_20948_BIT_WOM_INT_EN;
  }
  /* Write value to register */
  ICM_20948_registerWrite(ICM_20948_REG_INT_ENABLE, intEnable);
 
  /* All interrupts disabled by default */
  intEnable = 0;
 
  if ( dataReadyEnable ) {
    intEnable = ICM_20948_BIT_RAW_DATA_0_RDY_EN;
  }
 
  /* Write value to register */
  ICM_20948_registerWrite(ICM_20948_REG_INT_ENABLE_1, intEnable);
 
  return ICM_20948_OK;
}

References ICM_20948_BIT_RAW_DATA_0_RDY_EN, ICM_20948_BIT_WOM_INT_EN, ICM_20948_OK, ICM_20948_REG_INT_ENABLE, ICM_20948_REG_INT_ENABLE_1, and ICM_20948_registerWrite().

Referenced by CheckIMUidle(), and ICM_20948_wakeOnMotionITEnable().

ICM_20948_interruptStatusRead()

uint32_t ICM_20948_interruptStatusRead

(

uint32_t *

intStatus

)

Read staus of interrupt IMU.

Parameters

[out]

intStatus

pointer to store status

Definition at line 857 of file ICM20948.c.

{
  uint8_t reg[4];
 
  ICM_20948_registerRead(ICM_20948_REG_INT_STATUS, 4, reg);
  *intStatus = (uint32_t) reg[0];
  *intStatus |= ( ( (uint32_t) reg[1]) << 8);
  *intStatus |= ( ( (uint32_t) reg[2]) << 16);
  *intStatus |= ( ( (uint32_t) reg[3]) << 24);
 
  return ICM_20948_OK;
}

References ICM_20948_OK, ICM_20948_REG_INT_STATUS, and ICM_20948_registerRead().

ICM_20948_latchEnable()

uint32_t ICM_20948_latchEnable

(

bool

enable

)

Enables / disables the 50 micro seconds interrupt pin functionality.

Note

written myself, changes the whole register, maybe not so good...

Parameters

[in]

enable

true - Enable 50 micro second interrupt. false - INT1 pin level held until interrupt status is cleared.

Definition at line 1403 of file ICM20948.c.

{
    uint8_t temp;
    ICM_20948_registerRead(ICM_20948_REG_INT_PIN_CFG, 1, &temp);
 
    if(enable)
    {
        /* Set interrupt pin to pulse, no need to read a interrupt register for proceeding */
        /*  1 � INT1 pin level held until interrupt status is cleared.
         *  0 � INT1 pin indicates interrupt pulse is width 50 us  <----
         */
        ICM_20948_registerWrite(ICM_20948_REG_INT_PIN_CFG, temp | 0b00010000);
        //ICM_20948_registerWrite(ICM_20948_REG_INT_PIN_CFG, 0b00010000);
    }else{
        ICM_20948_registerWrite(ICM_20948_REG_INT_PIN_CFG, 0b00000000);
    }
 
    return ICM_20948_OK;
}

References ICM_20948_OK, ICM_20948_REG_INT_PIN_CFG, ICM_20948_registerRead(), and ICM_20948_registerWrite().

Referenced by ICM_20948_Init2().

ICM_20948_lowPowerModeEnter()

uint32_t ICM_20948_lowPowerModeEnter	(	bool	enAccel,
		bool	enGyro,
		bool	enTemp
	)

Enter low power mode for selected sensors.

Parameters

[in]	enAccel	'true' - go low power 'false' - low noise mode
[in]	enGyro	'true' - go low power 'false' - low noise mode
[in]	enTemp	'true' - go low power 'false' - low noise mode

Returns

OK if successful

Definition at line 1037 of file ICM20948.c.

{
  uint8_t data;
 
  ICM_20948_registerRead(ICM_20948_REG_PWR_MGMT_1, 1, &data);
 
  if ( enAccel || enGyro || enTemp ) {
    /* Make sure that the chip is not in sleep */
    ICM_20948_sleepModeEnable(false);
 
    /* And in continuous mode */
    ICM_20948_cycleModeEnable(false);
 
    /* Enable the accelerometer and the gyroscope*/
    ICM_20948_sensorEnable(enAccel, enGyro, enTemp);
    delay(50);
 
    /* Enable cycle mode */
    ICM_20948_cycleModeEnable(true);
 
    /* Set the LP_EN bit to enable low power mode */
    data |= ICM_20948_BIT_LP_EN;
  } else {
    /* Enable continuous mode */
    ICM_20948_cycleModeEnable(false);
 
    /* Clear the LP_EN bit to disable low power mode */
    data &= ~ICM_20948_BIT_LP_EN;
  }
 
  /* Write the updated value to the PWR_MGNT_1 register */
  ICM_20948_registerWrite(ICM_20948_REG_PWR_MGMT_1, data);
 
  return ICM_20948_OK;
}

References data, delay(), ICM_20948_BIT_LP_EN, ICM_20948_cycleModeEnable(), ICM_20948_OK, ICM_20948_REG_PWR_MGMT_1, ICM_20948_registerRead(), ICM_20948_registerWrite(), ICM_20948_sensorEnable(), and ICM_20948_sleepModeEnable().

Referenced by ICM_20948_wakeOnMotionITEnable().

ICM_20948_magDataRead()

void ICM_20948_magDataRead

(

float *

magn

)

Convert raw magnetometer values to calibrated and scaled ones.

Parameters

[out]

magn

calibrated values in µT

Definition at line 1745 of file ICM20948.c.

                                        {
 
    uint8_t data[8];
    ICM_20948_read_mag_register(0x11, 8, data);
 
    /* Convert the LSB and MSB into a signed 16-bit value */
    _hxcounts = (((int16_t) data[1] << 8) | data[0] );
    _hycounts = (((int16_t) data[3] << 8) | data[2] );
    _hzcounts = (((int16_t) data[5] << 8) | data[4] );
 
    magn[0] = (((float)(tX[0]*_hxcounts + tX[1]*_hycounts + tX[2]*_hzcounts) * _magScale) + _hxb)*_hxs;
    magn[1] = (((float)(tY[0]*_hxcounts + tY[1]*_hycounts + tY[2]*_hzcounts) * _magScale) + _hyb)*_hys;
    magn[2] = (((float)(tZ[0]*_hxcounts + tZ[1]*_hycounts + tZ[2]*_hzcounts) * _magScale) + _hzb)*_hzs;
 
}

References _hxcounts, _hycounts, _hzcounts, _magScale, data, ICM_20948_read_mag_register(), and tX.

Referenced by ICM_20948_min_max_mag(), and measure_send().

ICM_20948_magn_to_angle()

void ICM_20948_magn_to_angle	(	float *	magn,
		float *	angle
	)

Test function for non-tilt compensated compass.

Parameters

[in]	magn	magnetometer values
[out]	angle	angle in degrees

Definition at line 1793 of file ICM20948.c.

                                                       {
 
    angle[0] = atan2(magn[1], magn[0]) * M_PI/180.0f;
 
}

References M_PI.

ICM_20948_magRawDataRead()

void ICM_20948_magRawDataRead

(

float *

raw_magn

)

Read magnetometer raw values.

Note

To update values, read all the way through the registers

Parameters

[out]

raw_magn

output magnetometer raw values

Definition at line 1707 of file ICM20948.c.

                                               {
 
    uint8_t data[8];
    ICM_20948_read_mag_register(0x11, 8, data);
 
    /* Convert the LSB and MSB into a signed 16-bit value */
    _hxcounts = (((int16_t) data[1] << 8) | data[0] );
    _hycounts = (((int16_t) data[3] << 8) | data[2] );
    _hzcounts = (((int16_t) data[5] << 8) | data[4] );
 
    /* Transform to same coordinate system as gyro & accel */
    raw_magn[0] = (float)(tX[0]*_hxcounts + tX[1]*_hycounts + tX[2]*_hzcounts);
    raw_magn[1] = (float)(tY[0]*_hxcounts + tY[1]*_hycounts + tY[2]*_hzcounts);
    raw_magn[2] = (float)(tZ[0]*_hxcounts + tZ[1]*_hycounts + tZ[2]*_hzcounts);
 
#if DEBUG_DBPRINTs == 1 /* DEBUG_DBPRINT */
            dbprint("rawMag x:  ");
            dbprintInt((int) raw_magn[0]);
            dbprint("   rawMag y:  ");
            dbprintInt((int) raw_magn[1]);
            dbprint("   minMag z:  ");
            dbprintInt((int) raw_magn[2]);
            dbprintln("");
#endif /* DEBUG_DBPRINT */
 
}

References _hxcounts, _hycounts, _hzcounts, data, dbprint(), dbprintInt(), dbprintln(), ICM_20948_read_mag_register(), tX, tY, and tZ.

ICM_20948_min_max_mag()

uint32_t ICM_20948_min_max_mag	(	int16_t *	minMag,
		int16_t *	maxMag
	)

Calculate minimum and maximum magnetometer values, which are used for calibration.

Parameters

[out]	minMag	pointer to minima from each axis
[out]	maxMag	pointer to maxima from each axis

Returns

'OK' if successful, 'ERROR' on error.

Definition at line 2186 of file ICM20948.c.

                                                                 {
    float m[3];
 
    minMag[0] = 32767; // alles kleiner dan dit wordt het minimum, daar staat er hier geen '-'!
    minMag[1] = 32767;
    minMag[2] = 32767;
 
    maxMag[0] = -32768; // hier hetzelfde, starten met de kleinste waarde, dan aanpassen dat het groter en groter wordt tot het maximum gevonden wordt!
    maxMag[1] = -32768;
    maxMag[2] = -32768;
 
    uint32_t max_time = 15000;
    uint32_t t_start = millis();
 
    /* Flags for if axis mag_minimumRange is fulfilled */
    bool miniumRange_mx = false;
    bool miniumRange_my = false;
    bool miniumRange_mz = false;
 
 
    while (!miniumRange_mx || !miniumRange_my || !miniumRange_mz) {
        while ((millis() - t_start) < max_time)  {
 
            /* read magnetometer measurement */
            ICM_20948_magDataRead( m );
 
            if (m[0] < minMag[0]) {
                minMag[0] = m[0];
            }
            if (m[0] > maxMag[0]) {
                maxMag[0] = m[0];
            }
 
            if (m[1] < minMag[1]) {
                minMag[1] = m[1];
            }
            if (m[1] > maxMag[1]) {
                maxMag[1] = m[1];
            }
 
            if (m[2] < minMag[2]) {
                minMag[2] = m[2];
            }
            if (m[2] > maxMag[2]) {
                maxMag[2] = m[2];
            }
 
            if ((maxMag[0] - minMag[0]) > mag_minimumRange) {
                miniumRange_mx = true;
            }
            if ((maxMag[1] - minMag[1]) > mag_minimumRange) {
                miniumRange_my = true;
            }
            if ((maxMag[2] - minMag[2]) > mag_minimumRange) {
                miniumRange_mz = true;
            }
 
//                DEBUG_PRINT(min_mx); DEBUG_PRINT("\t"); DEBUG_PRINT(min_my); DEBUG_PRINT("\t"); DEBUG_PRINTLN(min_mz);
//                DEBUG_PRINT(max_mx); DEBUG_PRINT("\t"); DEBUG_PRINT(max_my); DEBUG_PRINT("\t"); DEBUG_PRINTLN(max_mz);
//                DEBUG_PRINTLN();
#if DEBUG_DBPRINT == 1 /* DEBUG_DBPRINT */
            dbprint("minMag:  ");
            dbprintInt((int) minMag[0]);
            dbprint("   minMag:  ");
            dbprintInt((int) minMag[1]);
            dbprint("   minMag:  ");
            dbprintInt((int) minMag[2]);
            dbprint("   maxMag:  ");
            dbprintInt((int) maxMag[0]);
            dbprint("   maxMag:  ");
            dbprintInt((int) maxMag[1]);
            dbprint("   maxMag:  ");
            dbprintInt((int) maxMag[2]);
            dbprintln("");
#endif /* DEBUG_DBPRINT */
        }
    }
 
    return OK;
}

References dbprint(), dbprintInt(), dbprintln(), ICM_20948_magDataRead(), mag_minimumRange, millis(), and OK.

ICM_20948_power()

void ICM_20948_power

(

bool

enable

)

Turns the GPIO pin high to provide power to the ICM20948.

Note

max current 20mA, in total max 100mA (all GPIO pins combined)

Parameters

[in]

enable

true - Provide power to the IMU. false - Cut-off power to the IMU.

Definition at line 392 of file ICM20948.c.

{
    /* Initialize VDD pin if not already the case */
//  if (!ICM_20948_Initialized)
//  {
//      /* In the case of gpioModePushPull", the last argument directly sets the pin state */
//      GPIO_PinModeSet(ICM_20948_POWER_PORT, ICM_20948_POWER_PIN, gpioModePushPull, enable);
 
//      ICM_20948_Initialized = true;
//  }
//  else
//  {
        if (enable) GPIO_PinModeSet(ICM_20948_POWER_PORT, ICM_20948_POWER_PIN, gpioModePushPull, enable); /* Enable VDD pin */
        else GPIO_PinModeSet(ICM_20948_POWER_PORT, ICM_20948_POWER_PIN, gpioModeDisabled, 0); /* Disable VDD pin */
//  }
}

References ICM_20948_POWER_PIN, and ICM_20948_POWER_PORT.

Referenced by ICM_20948_Init().

ICM_20948_printAllData()

void ICM_20948_printAllData

(

)

Print all gyro + accel + magn data using dbprint.

Definition at line 414 of file ICM20948.c.

{
    /* Gyro [DPS]
     * Accel [G *1000] (to print it in Integers
     */
 
      /* Variables to store gyro & accel data
       * GYRO:  X --> ICM_20948_gyro[0];
       *        Y --> ICM_20948_gyro[1];
       *        Z --> ICM_20948_gyro[2];
       * ACCEL: X --> ICM_20948_accel[0]:
       *        Y --> ICM_20948_accel[1]:
       *        Z --> ICM_20948_accel[2]:
       */
#if DEBUG_DBPRINTs == 1 /* DEBUG_DBPRINT */
      dbprint(" Gyro x: ");
      dbprintInt((int) ICM_20948_gyro[0] );
      dbprint(" Gyro y: ");
      dbprintInt((int) ICM_20948_gyro[1] );
      dbprint(" Gyro z: ");
      dbprintInt((int) ICM_20948_gyro[2] );
      dbprint(" Accel x: ");
      dbprintInt((int) (ICM_20948_accel[0]*1000) );
      dbprint(" Accel y: ");
      dbprintInt((int) (ICM_20948_accel[1]*1000) );
      dbprint(" Accel z: ");
      dbprintInt((int) (ICM_20948_accel[2]*1000) );
      dbprint(" Magn x: ");
      dbprintInt((int) ICM_20948_magn[0] );
      dbprint(" Magn y: ");
      dbprintInt((int) ICM_20948_magn[1] );
      dbprint(" Magn z: ");
      dbprintlnInt((int) ICM_20948_magn[2] );
#endif /* DEBUG_DBPRINT */
 
}

References dbprint(), dbprintInt(), and dbprintlnInt().

ICM_20948_read()

uint8_t ICM_20948_read

(

uint16_t

addr

)

Read single register from IMU using SPI.

Parameters

[in]

addr

address 16 bits - first bits are bank, the rest of the bits is the address

Definition at line 545 of file ICM20948.c.

{
    uint8_t data;
    uint8_t reg_address;
    uint8_t bank;
 
    /* Select last 7 bytes (A6 - A0) to use as register address */
    /* Address format: | R/W | A6 | A5 | A4 | A3 | A2 | A1 | A0 | */
    /* Use AND to change only last 7 bytes */
    reg_address = (uint8_t) (addr & 0b01111111);
 
    bank = (uint8_t) (addr >> 7);
 
    /* Select right bank */
    ICM_20948_bankSelect(bank);
 
    /* Enable CS */
    ICM_20948_chipSelectSet(true);
 
    /* Set the first byte to 1 to read (according to data sheet) */
    /* Address format: | R/W | A6 | A5 | A4 | A3 | A2 | A1 | A0 | */
    /* Read setup */
    USART_SpiTransfer(SPI, (reg_address | 0b10000000));
 
    /* Read data */
    data = USART_SpiTransfer(SPI, 0x00);
 
    /* Disable CS */
    ICM_20948_chipSelectSet(false);
 
    return (data);
}

References data, ICM_20948_bankSelect(), ICM_20948_chipSelectSet(), and SPI.

Referenced by ICM_20948_check_WhoAmI(), readMagRegister(), and waitForSlave4().

ICM_20948_read_mag_register()

void ICM_20948_read_mag_register	(	uint8_t	addr,
		uint8_t	numBytes,
		uint8_t *	data
	)

Read register in the AK09916 magnetometer device.

Parameters

[in]	addr	Register address to read from Bit[6:0] - register address
[in]	numBytes	Number of bytes to read
[out]	data	Data read from register

Returns

None

Definition at line 1594 of file ICM20948.c.

                                                                                {
    uint8_t wBuffer[2];
    wBuffer[0] = addr;
    wBuffer[1] = 0x00;
 
    IIC_WriteReadBuffer( ( AK09916_BIT_I2C_SLV_ADDR << 1 ), wBuffer, 1, data, numBytes);
}

References AK09916_BIT_I2C_SLV_ADDR, data, and IIC_WriteReadBuffer().

Referenced by ICM_20948_Init(), ICM_20948_Init2(), ICM_20948_magDataRead(), and ICM_20948_magRawDataRead().

ICM_20948_registerRead()

void ICM_20948_registerRead	(	uint16_t	addr,
		int	numBytes,
		uint8_t *	data
	)

Read registers from IMU.

Using I2C

Parameters

[in]	addr	address
[in]	numBytes	numer of bytes to read
[out]	data	pointer to store data

Definition at line 654 of file ICM20948.c.

{
    uint8_t regAddr;
    uint8_t bank;
 
 
 
    uint8_t rLength = (uint8_t) numBytes;
 
 
    regAddr = (uint8_t) (addr & 0x7F);
    bank = (uint8_t) (addr >> 7);
 
    ICM_20948_bankSelect(bank);
 
    uint8_t wBuffer[2];
    wBuffer[0] = regAddr;
    wBuffer[1] = 0x00;  /* 0x00 to read */
 
    // TODO
 
    IIC_WriteReadBuffer(ICM_20948_I2C_ADDRESS, wBuffer, 1, data, rLength);
 
 
    return;
}

References data, ICM_20948_bankSelect(), ICM_20948_I2C_ADDRESS, and IIC_WriteReadBuffer().

Referenced by ICM_20948_accelBandwidthSet(), ICM_20948_accelDataRead(), ICM_20948_accelFullscaleSet(), ICM_20948_accelGyroCalibrate(), ICM_20948_accelResolutionGet(), ICM_20948_gyroBandwidthSet(), ICM_20948_gyroCalibrate(), ICM_20948_gyroDataRead(), ICM_20948_gyroFullscaleSet(), ICM_20948_gyroResolutionGet(), ICM_20948_Init2(), ICM_20948_interruptStatusRead(), ICM_20948_latchEnable(), ICM_20948_lowPowerModeEnter(), ICM_20948_sensorEnable(), and ICM_20948_sleepModeEnable().

ICM_20948_registerWrite()

void ICM_20948_registerWrite	(	uint16_t	addr,
		uint8_t	data
	)

Writes registers from IMU.

Using I2C

Parameters

[in]	addr	address
[out]	data	data to be written

Definition at line 697 of file ICM20948.c.

{
    uint8_t regAddr;
    uint8_t bank;
 
    regAddr = (uint8_t) (addr & 0x7F);
    bank = (uint8_t) (addr >> 7);
 
    ICM_20948_bankSelect(bank);
 
    uint8_t wBuffer[2];
    wBuffer[0] = regAddr;
    wBuffer[1] = data;
 
 
    IIC_WriteBuffer(ICM_20948_I2C_ADDRESS, wBuffer, 2);
 
    return;
}

References data, ICM_20948_bankSelect(), ICM_20948_I2C_ADDRESS, and IIC_WriteBuffer().

Referenced by ICM_20948_accelBandwidthSet(), ICM_20948_accelFullscaleSet(), ICM_20948_accelGyroCalibrate(), ICM_20948_accelSampleRateSet(), ICM_20948_cycleModeEnable(), ICM_20948_gyroBandwidthSet(), ICM_20948_gyroCalibrate(), ICM_20948_gyroFullscaleSet(), ICM_20948_gyroSampleRateSet(), ICM_20948_Init2(), ICM_20948_interruptEnable(), ICM_20948_latchEnable(), ICM_20948_lowPowerModeEnter(), ICM_20948_reset(), ICM_20948_sensorEnable(), ICM_20948_set_mag_transfer(), ICM_20948_sleepModeEnable(), ICM_20948_wakeOnMotionITEnable(), readMagRegister(), and writeMagRegister().

ICM_20948_reset()

uint32_t ICM_20948_reset

(

void

)

Reset IMU.

Definition at line 762 of file ICM20948.c.

{
  /* Set H_RESET bit to initiate soft reset */
  ICM_20948_registerWrite(ICM_20948_REG_PWR_MGMT_1, ICM_20948_BIT_H_RESET);
 
  /* Wait 100ms to complete the reset sequence */
  delay(100);
 
  return ICM_20948_OK;
}

References delay(), ICM_20948_BIT_H_RESET, ICM_20948_OK, ICM_20948_REG_PWR_MGMT_1, and ICM_20948_registerWrite().

Referenced by ICM_20948_Init().

ICM_20948_reset_mag()

uint32_t ICM_20948_reset_mag

(

void

)

Reset magnetometer.

Definition at line 1768 of file ICM20948.c.

                                   {
    /* Set SRST bit to initiate soft reset */
    ICM_20948_write_mag_register(AK09916_REG_CONTROL_3, AK09916_BIT_SRST);
 
    /* Wait 100ms to complete reset sequence */
    delay(100);
 
    return OK;
}

References AK09916_BIT_SRST, AK09916_REG_CONTROL_3, delay(), ICM_20948_write_mag_register(), and OK.

ICM_20948_sampleRateSet()

uint32_t ICM_20948_sampleRateSet

(

float

sampleRate

)

Combination function to set sample rate of gyro and accel at once.

will automatically calculate a sample rate that fits the sample rate divider register

Parameters

[in/out]

sampleRate desired sample rate

Definition at line 924 of file ICM20948.c.

{
  ICM_20948_gyroSampleRateSet(sampleRate);
  ICM_20948_accelSampleRateSet(sampleRate);
 
  return ICM_20948_OK;
}

References ICM_20948_accelSampleRateSet(), ICM_20948_gyroSampleRateSet(), and ICM_20948_OK.

Referenced by ICM_20948_accelGyroCalibrate(), ICM_20948_gyroCalibrate(), ICM_20948_Init2(), and ICM_20948_wakeOnMotionITEnable().

ICM_20948_sensorEnable()

uint32_t ICM_20948_sensorEnable	(	bool	accel,
		bool	gyro,
		bool	temp
	)

Enable selected sensors.

Parameters

[in]	accel	'true' - enable 'false' - disable
[in]	gyro	'true' - enable 'false' - disable
[in]	temp	'true' - enable 'false' - disable

Returns

OK if successful

Definition at line 1095 of file ICM20948.c.

{
  uint8_t pwrManagement1;
  uint8_t pwrManagement2;
 
  ICM_20948_registerRead(ICM_20948_REG_PWR_MGMT_1, 1, &pwrManagement1);
  pwrManagement2 = 0;
 
  /* To enable the accelerometer clear the DISABLE_ACCEL bits in PWR_MGMT_2 */
  if ( accel ) {
    pwrManagement2 &= ~(ICM_20948_BIT_PWR_ACCEL_STBY);
  } else {
    pwrManagement2 |= ICM_20948_BIT_PWR_ACCEL_STBY;
  }
 
  /* To enable gyro clear the DISABLE_GYRO bits in PWR_MGMT_2 */
  if ( gyro ) {
    pwrManagement2 &= ~(ICM_20948_BIT_PWR_GYRO_STBY);
  } else {
    pwrManagement2 |= ICM_20948_BIT_PWR_GYRO_STBY;
  }
 
  /* To enable the temperature sensor clear the TEMP_DIS bit in PWR_MGMT_1 */
  if ( temp ) {
    pwrManagement1 &= ~(ICM_20948_BIT_TEMP_DIS);
  } else {
    pwrManagement1 |= ICM_20948_BIT_TEMP_DIS;
  }
 
  /* Write back the modified values */
  ICM_20948_registerWrite(ICM_20948_REG_PWR_MGMT_1, pwrManagement1);
  ICM_20948_registerWrite(ICM_20948_REG_PWR_MGMT_2, pwrManagement2);
 
  return ICM_20948_OK;
}

References ICM_20948_BIT_PWR_ACCEL_STBY, ICM_20948_BIT_PWR_GYRO_STBY, ICM_20948_BIT_TEMP_DIS, ICM_20948_OK, ICM_20948_REG_PWR_MGMT_1, ICM_20948_REG_PWR_MGMT_2, ICM_20948_registerRead(), and ICM_20948_registerWrite().

Referenced by ICM_20948_accelGyroCalibrate(), ICM_20948_gyroCalibrate(), ICM_20948_Init2(), ICM_20948_lowPowerModeEnter(), and ICM_20948_wakeOnMotionITEnable().

ICM_20948_set_mag_mode()

uint32_t ICM_20948_set_mag_mode

(

uint8_t

magMode

)

Set magnetometer mode (sample rate / on-off)

Note

Must read special register to update values

Parameters

[in]

magMode

Magnetometer mode

Definition at line 1670 of file ICM20948.c.

                                                {
    switch ( magMode ) {
        case AK09916_BIT_MODE_POWER_DOWN:
            break;
        case AK09916_MODE_SINGLE:
            break;
        case AK09916_MODE_10HZ:
            break;
        case AK09916_MODE_20HZ:
            break;
        case AK09916_MODE_50HZ:
            break;
        case AK09916_MODE_100HZ:
            break;
        case AK09916_MODE_ST:
            break;
        default:
            return ERROR;
    }
 
    ICM_20948_write_mag_register(AK09916_REG_CONTROL_2, magMode);
 
    return OK;
}

References AK09916_BIT_MODE_POWER_DOWN, AK09916_MODE_100HZ, AK09916_MODE_10HZ, AK09916_MODE_20HZ, AK09916_MODE_50HZ, AK09916_MODE_SINGLE, AK09916_MODE_ST, AK09916_REG_CONTROL_2, ERROR, ICM_20948_write_mag_register(), and OK.

Referenced by ICM_20948_Init(), and ICM_20948_Init2().

ICM_20948_set_mag_transfer()

void ICM_20948_set_mag_transfer

(

bool

read

)

Set magnetometer data transfer on integrated I2C controller inside ICM20948.

Note

Not used, this function is only being used when using SPI, not working properly

Parameters

[in]

read

'true' - enable 'false' - disable

Definition at line 1443 of file ICM20948.c.

                                           {
    uint8_t MAG_BIT_READ   = AK09916_BIT_I2C_SLV_ADDR | ICM_20948_BIT_I2C_SLV_READ;
    uint8_t MAG_BIT_WRITE  = AK09916_BIT_I2C_SLV_ADDR;
 
    bool read_old = !read;
 
    /* Set transfer mode if it has changed */
    if (read != read_old) {
        if (read) {
            ICM_20948_registerWrite(ICM_20948_REG_I2C_SLV0_ADDR, MAG_BIT_READ);
        }
        else {
            ICM_20948_registerWrite(ICM_20948_REG_I2C_SLV0_ADDR, MAG_BIT_WRITE);
        }
        read_old = read;
    }
    return;
}

References AK09916_BIT_I2C_SLV_ADDR, ICM_20948_BIT_I2C_SLV_READ, ICM_20948_REG_I2C_SLV0_ADDR, and ICM_20948_registerWrite().

ICM_20948_sleepModeEnable()

uint32_t ICM_20948_sleepModeEnable

(

bool

enable

)

Sleep mode enable function.

Parameters

[in]

enable

'true' - sleep 'false' - active

Definition at line 728 of file ICM20948.c.

{
  uint8_t reg;
 
  /* Read the Sleep Enable register */
  ICM_20948_registerRead(ICM_20948_REG_PWR_MGMT_1, 1, &reg);
 
  if ( enable ) {
    /* Sleep: set the SLEEP bit */
    reg |= ICM_20948_BIT_SLEEP;
  } else {
    /* Wake up: clear the SLEEP bit */
    //reg &= ~(ICM_20948_BIT_SLEEP); /* this was the provided code */
 
    /* My own solution */
    /* AND to define the bits that can be changed: here bit nr 6 */
    reg &= 0b10111111;
    /*OR met 0 to set the SLEEP bit to 0, not really necessary in this case */
    reg |= 0b00000000;
  }
 
  ICM_20948_registerWrite(ICM_20948_REG_PWR_MGMT_1, reg);
 
 
  return ICM_20948_OK;
}

References ICM_20948_BIT_SLEEP, ICM_20948_OK, ICM_20948_REG_PWR_MGMT_1, ICM_20948_registerRead(), and ICM_20948_registerWrite().

Referenced by ICM_20948_Init2(), ICM_20948_lowPowerModeEnter(), and ICM_20948_wakeOnMotionITEnable().

ICM_20948_wakeOnMotionITEnable()

uint32_t ICM_20948_wakeOnMotionITEnable	(	bool	enable,
		uint8_t	womThreshold,
		float	sampleRate
	)

Set wake on motion interrupt.

Parameters

[in]	enable	'true' - enable wom interrupt 'false' - disable wom interrupt
[in]	womThreshold	value above which an interrupt is generated
[in]	sampleRate	sample rate of accel in duty cycle mode (low power mode)

Definition at line 1295 of file ICM20948.c.

{
  if ( enable ) {
    /* Make sure that the chip is not in sleep */
    ICM_20948_sleepModeEnable(false);
 
    /* And in continuous mode */
    ICM_20948_cycleModeEnable(false);
 
    /* Enable only the accelerometer */
    ICM_20948_sensorEnable(true, false, false);
 
    /* Set sample rate */
    ICM_20948_sampleRateSet(sampleRate);
 
    /* Set the bandwidth to 1210Hz */
    ICM_20948_accelBandwidthSet(ICM_20948_ACCEL_BW_1210HZ);
 
    /* Accel: 2G full scale */
    ICM_20948_accelFullscaleSet(ICM_20948_ACCEL_FULLSCALE_2G);
 
    /* Enable the Wake On Motion interrupt */
    ICM_20948_interruptEnable(false, true);
    delay(50);
 
    /* Enable Wake On Motion feature */
    ICM_20948_registerWrite(ICM_20948_REG_ACCEL_INTEL_CTRL, ICM_20948_BIT_ACCEL_INTEL_EN | ICM_20948_BIT_ACCEL_INTEL_MODE);
 
    /* Set the wake on motion threshold value */
    ICM_20948_registerWrite(ICM_20948_REG_ACCEL_WOM_THR, womThreshold);
 
    /* Enable low power mode */
    ICM_20948_lowPowerModeEnter(true, false, false);
  } else {
    /* Disable Wake On Motion feature */
    ICM_20948_registerWrite(ICM_20948_REG_ACCEL_INTEL_CTRL, 0x00);
 
    /* Disable the Wake On Motion interrupt */
    ICM_20948_interruptEnable(false, false);
 
    /* Disable cycle mode */
    ICM_20948_cycleModeEnable(false);
  }
 
  return ICM_20948_OK;
}

References delay(), ICM_20948_ACCEL_BW_1210HZ, ICM_20948_ACCEL_FULLSCALE_2G, ICM_20948_accelBandwidthSet(), ICM_20948_accelFullscaleSet(), ICM_20948_BIT_ACCEL_INTEL_EN, ICM_20948_BIT_ACCEL_INTEL_MODE, ICM_20948_cycleModeEnable(), ICM_20948_interruptEnable(), ICM_20948_lowPowerModeEnter(), ICM_20948_OK, ICM_20948_REG_ACCEL_INTEL_CTRL, ICM_20948_REG_ACCEL_WOM_THR, ICM_20948_registerWrite(), ICM_20948_sampleRateSet(), ICM_20948_sensorEnable(), and ICM_20948_sleepModeEnable().

ICM_20948_write_mag_register()

void ICM_20948_write_mag_register	(	uint8_t	addr,
		uint8_t	data
	)

Writes a uint8_t to the I2C address of the magnetometer of the ICM_20948.

Note

Values not updating, register must be read to update...

Parameters

[in]	addr	The address that needs to be written to.
[in]	data	The data that needs to be written.

Definition at line 1648 of file ICM20948.c.

                                                              {
    uint8_t wBuffer[2];
    wBuffer[0] = addr;
    wBuffer[1] = data;
 
    IIC_WriteBuffer( ( AK09916_BIT_I2C_SLV_ADDR << 1 ), wBuffer, 2);
}

References AK09916_BIT_I2C_SLV_ADDR, data, and IIC_WriteBuffer().

Referenced by ICM_20948_Init2(), ICM_20948_reset_mag(), and ICM_20948_set_mag_mode().

readMagRegister()

unsigned char readMagRegister

(

unsigned char

magreg

)

Read magnetometer register from I2C controller in ICM20948.

Note

Not used, not working properly

Parameters

[in/out]

magreg register to be read

Returns

read value

Definition at line 1509 of file ICM20948.c.

{
  // We use slave4, which is oneshot:
    ICM_20948_registerWrite(ICM_20948_REG_I2C_SLV4_ADDR, ICM_20948_BIT_I2C_READ | AK09916_BIT_I2C_SLV_ADDR);
    ICM_20948_registerWrite(ICM_20948_REG_I2C_SLV4_REG, magreg);
    ICM_20948_registerWrite(ICM_20948_REG_I2C_SLV4_CTRL, ICM_20948_BIT_I2C_SLV_EN);
 
  waitForSlave4();
 
  return ICM_20948_read(ICM_20948_REG_I2C_SLV4_DI);
}

References AK09916_BIT_I2C_SLV_ADDR, ICM_20948_BIT_I2C_READ, ICM_20948_BIT_I2C_SLV_EN, ICM_20948_read(), ICM_20948_REG_I2C_SLV4_ADDR, ICM_20948_REG_I2C_SLV4_CTRL, ICM_20948_REG_I2C_SLV4_DI, ICM_20948_REG_I2C_SLV4_REG, ICM_20948_registerWrite(), and waitForSlave4().

waitForSlave4()

void waitForSlave4

(

)

Wait for I2C slave (internal I2C controller on ICM20948)

Note

Not used, not working properly

Definition at line 1472 of file ICM20948.c.

{
  // Wait until the data is ready:
 
    delay(100);
    unsigned char status = ICM_20948_read(ICM_20948_REG_I2C_MST_STATUS);
    if (status & ICM_20948_BIT_SLV4_NACK)
    {
#if DEBUG_DBPRINT == 1 /* DEBUG_DBPRINT */
        dbprint("Failed to communicate with compass: NACK");
#endif /* DEBUG_DBPRINT */
    }
    if (status & ICM_20948_BIT_SLV4_DONE)
    {
#if DEBUG_DBPRINT == 1 /* DEBUG_DBPRINT */
        dbprint("Transaction Done");
#endif /* DEBUG_DBPRINT */
    }
}

References dbprint(), delay(), ICM_20948_BIT_SLV4_DONE, ICM_20948_BIT_SLV4_NACK, ICM_20948_read(), and ICM_20948_REG_I2C_MST_STATUS.

Referenced by readMagRegister(), and writeMagRegister().

writeMagRegister()

void writeMagRegister	(	unsigned char	magreg,
		unsigned char	val
	)

Write magnetometer register using internal I2C interface on ICM20948.

Note

Not used, not working properly

Parameters

[in]	magreg	register
[out]	val	output register

Definition at line 1538 of file ICM20948.c.

{
  // We use slave4, which is oneshot:
    ICM_20948_registerWrite(ICM_20948_REG_I2C_SLV4_ADDR, AK09916_BIT_I2C_SLV_ADDR);
    ICM_20948_registerWrite(ICM_20948_REG_I2C_SLV4_REG, magreg);
    ICM_20948_registerWrite(ICM_20948_REG_I2C_SLV4_DO, val);
    ICM_20948_registerWrite(ICM_20948_REG_I2C_SLV4_CTRL, ICM_20948_BIT_I2C_SLV_EN);
 
  waitForSlave4();
}

References AK09916_BIT_I2C_SLV_ADDR, ICM_20948_BIT_I2C_SLV_EN, ICM_20948_REG_I2C_SLV4_ADDR, ICM_20948_REG_I2C_SLV4_CTRL, ICM_20948_REG_I2C_SLV4_DO, ICM_20948_REG_I2C_SLV4_REG, ICM_20948_registerWrite(), and waitForSlave4().

Variable Documentation

_hx

float _hx

Definition at line 57 of file ICM20948.c.

_hxcounts

int16_t _hxcounts

Definition at line 47 of file ICM20948.c.

Referenced by ICM_20948_magDataRead(), and ICM_20948_magRawDataRead().

_hy

float _hy

Definition at line 57 of file ICM20948.c.

_hycounts

int16_t _hycounts

Definition at line 47 of file ICM20948.c.

Referenced by ICM_20948_magDataRead(), and ICM_20948_magRawDataRead().

_hz

float _hz

Not used, int16_t _hxcounts,_hycounts,_hzcounts are used to store magnetometer values

Definition at line 57 of file ICM20948.c.

_hzcounts

int16_t _hzcounts

Magnetometer x, y and z axis values (not calibrated)

Definition at line 47 of file ICM20948.c.

Referenced by ICM_20948_magDataRead(), and ICM_20948_magRawDataRead().

_magScale

float _magScale = (4912.0f) / (32767.5f)

Factor to calulate magn in microTesla from raw values of registers, same as magscale

Definition at line 63 of file ICM20948.c.

Referenced by ICM_20948_magDataRead().

accRawScaling

float accRawScaling = 32767.5f

=(2^16-1)/2 16 bit representation of acc value to cover +/- range

Definition at line 59 of file ICM20948.c.

gyroRawScaling

float gyroRawScaling = 32767.5f

=(2^16-1)/2 16 bit representation of gyro value to cover +/- range

Definition at line 60 of file ICM20948.c.

ICM_20948_Initialized

bool ICM_20948_Initialized = false

Variable to keep track if the IMU is initialized

Definition at line 40 of file ICM20948.c.

Referenced by ICM_20948_Init().

IMU_MEASURING

bool IMU_MEASURING

Variable to check if IMU is measuring

Keep track of the state of the IMU

Definition at line 126 of file main.c.

mag_minimumRange

int32_t mag_minimumRange = 40

Minimum value to look for on each axis of the magnetometer, to make sure the magnetomeres is being rotated

Definition at line 42 of file ICM20948.c.

Referenced by ICM_20948_min_max_mag().

mag_res

float mag_res = 4912.0f / 32752.0f

Factor to calulate magn in microTesla from raw values of registers

Definition at line 46 of file ICM20948.c.

magRawScaling

float magRawScaling = 32767.5f

=(2^16-1)/2 16 bit representation of gyro value to cover +/- range

Definition at line 61 of file ICM20948.c.

tX

int16_t tX[3] = {1, 0, 0}

Transformation matrix to put magnetometer in same reference frame as gyro and accel

Definition at line 53 of file ICM20948.c.

Referenced by ICM_20948_magDataRead(), and ICM_20948_magRawDataRead().

tY

int16_t tY[3] = {0, -1, 0}

Transformation matrix to put magnetometer in same reference frame as gyro and accel

Definition at line 54 of file ICM20948.c.

Referenced by ICM_20948_magRawDataRead().

tZ

int16_t tZ[3] = {0, 0, -1}

Transformation matrix to put magnetometer in same reference frame as gyro and accel

Definition at line 55 of file ICM20948.c.

Referenced by ICM_20948_magRawDataRead().