DS2485_port_maxim.c

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/**
 * @file DS2485_port_maxim.c
 * @brief Platform-specific interface used to drive the DS2485 over I2C in the original Maxim environment.
 *
 * @par Update history
 * 18-May-2023  Dave Nadler  Isolated platform-dependent code in this source file.
 *
 * @note This implementation is not used in the SensorBox/Vario application.
 */

/*******************************************************************************
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*
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*******************************************************************************
*/

/* **** Includes **** */
#include <stdint.h>
#include <string.h>  // memcpy...

#if 1 // Maxim-specific
  #include "i2c.h"
  #include "mxc_delay.h"
  #include "mxc_sys.h"
  #include "tmr.h"
  #include "mxc_config.h"
#endif

#include "DS2485.h"

/* **** Definitions **** */
#define I2C_MASTER      MXC_I2C0
#define I2C_MASTER_IDX  0
#define I2C_SLAVE_ADDR  (DS2485_I2C_7BIT_ADDRESS << 1)

/* **** Globals **** */

/* **** Functions **** */
int DS2485_ExecuteCommand(const uint8_t *packet, int packetSize, int delay_uSec, uint8_t *response, int responseSize)
{
    int error = 0;
    const sys_cfg_i2c_t sys_i2c_cfg = NULL;

    //Setup the I2C Master
    I2C_Shutdown(I2C_MASTER);
    if((error = I2C_Init(I2C_MASTER, I2C_STD_MODE, &sys_i2c_cfg)) != E_NO_ERROR) {
        return error;
    }

    if((error = I2C_MasterWrite(MXC_I2C0, I2C_SLAVE_ADDR, packet, packetSize, 0)) != packetSize) {
        return error;
    }

    mxc_delay(MXC_DELAY_MSEC(delay_uSec));

    //Read out Length Byte
    if((error = I2C_MasterRead(MXC_I2C0, I2C_SLAVE_ADDR, response, responseSize, 0)) != responseSize) {
        return error;
    }

    return 0;
}