I2C.c

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/*
 * I2C.c
 *
 *  Created on: Nov 18, 2019
 *      Author: jonac
 */
/***************************************************************************/
/*  ____  ____      _    __  __  ____ ___
 * |  _ \|  _ \    / \  |  \/  |/ ___/ _ \
 * | | | | |_) |  / _ \ | |\/| | |  | | | |
 * | |_| |  _ <  / ___ \| |  | | |__| |_| |
 * |____/|_| \_\/_/   \_\_|  |_|\____\___/
 *                           research group
 *                             dramco.be/
 *
 *  KU Leuven - Technology Campus Gent,
 *  Gebroeders De Smetstraat 1,
 *  B-9000 Gent, Belgium
 *
 *         File: iic.c
 *      Created: 2018-03-22
 *       Author: Geoffrey Ottoy
 *
 *  Description: I2C functionality (wrapper for EFM 32).
 *      Used for interfacing with sensors.
 */
 
#include <i2cspm.h>
#include <em_i2c.h>
 
#include "I2C.h"
 
#include "pinout.h"
 
#define I2C_PORT_LOCATION   1
 
I2CSPM_Init_TypeDef i2cInit = I2CSPM_INIT_DEFAULT;
 
 
/**************************************************************************/
void IIC_Init(void){
 
    /* We use the standard I2C pins and ports, so no need to adjust */
    /*
    i2cInit.port = I2C0;
    i2cInit.sclPort = gpioPortD;
    i2cInit.sclPin = 7;
    i2cInit.sdaPort = gpioPortD;
    i2cInit.sdaPin = 6;
    i2cInit.i2cClhr = i2cClockHLRStandard;
    i2cInit.i2cRefFreq = 0 ;
    i2cInit.i2cMaxFreq = I2C_FREQ_STANDARD_MAX;
    i2cInit.portLocation = I2C_PORT_LOCATION; //zie datasheet �controller (hashtag getal in pinout)
*/
//i2cInit.i2cMaxFreq = I2C_FREQ_FAST_MAX;
 
    I2CSPM_Init(&i2cInit);
}
 
void IIC_Enable( bool enable )
{
    if (enable)
    {
        GPIO_PinModeSet(ICM_20948_SDA_PORT, ICM_20948_SDA_PIN, gpioModeWiredAndPullUp, 1);
        GPIO_PinModeSet(ICM_20948_SCL_PORT, ICM_20948_SCL_PIN, gpioModeWiredAndPullUp, 1);
    }
    else
    {
        GPIO_PinModeSet(ICM_20948_SDA_PORT, ICM_20948_SDA_PIN, gpioModeDisabled, 1);
        GPIO_PinModeSet(ICM_20948_SCL_PORT, ICM_20948_SCL_PIN, gpioModeDisabled, 1);
    }
}
 
/**************************************************************************/
void IIC_Reset(void){
    I2C_Reset(i2cInit.port);
}
 
 
/**************************************************************************/
bool IIC_WriteBuffer(uint8_t iicAddress, uint8_t * wBuffer, uint8_t wLength){
    I2C_TransferSeq_TypeDef seq;
    I2C_TransferReturn_TypeDef ret;
    uint8_t i2c_read_data[0];
 
    seq.addr  = iicAddress;
    seq.flags = I2C_FLAG_WRITE;
    /* Point to write buffer (contains command & data) */
    seq.buf[0].data   = wBuffer;
    seq.buf[0].len    = wLength;
    /* Select location/length of data to be read */
    seq.buf[1].data = i2c_read_data;
    seq.buf[1].len  = 0;
 
    ret = I2CSPM_Transfer(i2cInit.port, &seq);
 
    if (ret != i2cTransferDone) {
        return false;
    }
 
    return true;
}
 
/**************************************************************************/
bool IIC_ReadBuffer(uint8_t iicAddress, uint8_t * rBuffer, uint8_t rLength){
    I2C_TransferSeq_TypeDef seq;
    I2C_TransferReturn_TypeDef ret;
 
    seq.addr  = iicAddress;
    seq.flags = I2C_FLAG_READ;
 
    /* Select location/length of data to be read */
    seq.buf[0].data = rBuffer;
    seq.buf[0].len  = rLength;
 
    ret = I2CSPM_Transfer(i2cInit.port, &seq);
 
    if (ret != i2cTransferDone) {
        *rBuffer = 0;
        return false;
    }
    return true;
}
 
 
/**************************************************************************/
bool IIC_WriteReadBuffer(uint8_t iicAddress, uint8_t * wBuffer, uint8_t wLength, uint8_t *rBuffer, uint8_t rLength){
    I2C_TransferSeq_TypeDef seq;
    I2C_TransferReturn_TypeDef ret;
 
    seq.addr  = iicAddress;
    seq.flags = I2C_FLAG_WRITE_READ;
    /* Point to write buffer (contains command & data) */
    seq.buf[0].data   = wBuffer;
    seq.buf[0].len    = wLength;
 
    /* Select location/length of data to be read */
    seq.buf[1].data = rBuffer;
    seq.buf[1].len  = rLength;
 
    ret = I2CSPM_Transfer(i2cInit.port, &seq);
 
    if (ret != i2cTransferDone) {
        *rBuffer = 0;
        return false;
    }
 
    return true;
}