RE: nRF 52 TWI in LSM9DS1

drVrh — Tue, 07 May 2019 12:44:05 GMT

I solved the problems, as you can see in in the attached code.

For further work we need to include the header file from:

the attached example comed from this source:

https://github.com/STMicroelectronics/STMems_Standard_C_drivers/tree/master/lsm9ds1_STdC/example

Note for Segger studio:

printf should be enabled in: right mouse click on project > Options > choose Common > in search box type "float" > change Printf Floating Point Supported from No to float.

RE: nRF 52 TWI in LSM9DS1

run_ar — Tue, 30 Apr 2019 12:08:31 GMT

Hi,

Have you looked at our SDK example: nRF5_SDK_15.3.0_59ac345\examples\peripheral\twi_master_with_twis_slave?

RE: nRF 52 TWI in LSM9DS1

drVrh — Thu, 25 Apr 2019 06:26:48 GMT

I modified the functions platform_read and platform_write from read_data_simple.c (from github) like this:

static int32_t platform_write(void *handle, uint8_t reg, uint8_t *bufp, uint16_t len){

    uint8_t *i2c_address = handle;

    ret_code_t err_code = nrf_drv_twi_tx(&m_twi, *i2c_address, &reg, len, false);
    APP_ERROR_CHECK(err_code);
    while (m_xfer_done == false);

    m_xfer_done = false;
    /* Read 1 byte from the specified address - skip 3 bits dedicated for fractional part of temperature. */
    err_code = nrf_drv_twi_rx(&m_twi, *i2c_address, bufp, len);
    APP_ERROR_CHECK(err_code);

  return 0;
}

static int32_t platform_read(void *handle, uint8_t reg, uint8_t *bufp, uint16_t len){
  uint8_t *i2c_address = handle;

    m_xfer_done = false;

    /* Read 1 byte from the specified address - skip 3 bits dedicated for fractional part of temperature. */
    ret_code_t err_code = nrf_drv_twi_rx(&m_twi, *i2c_address, &reg, len);
    APP_ERROR_CHECK(err_code);

    m_xfer_done = false;

    /* Read 1 byte from the specified address - skip 3 bits dedicated for fractional part of temperature. */
    err_code = nrf_drv_twi_rx(&m_twi, *i2c_address, bufp, len);
    APP_ERROR_CHECK(err_code);

  return 0;
}

my TWI init is:

void twi_init (void)
{
    ret_code_t err_code;

    const nrf_drv_twi_config_t twi_lm75b_config = {
       .scl                = ARDUINO_SCL_PIN,
       .sda                = ARDUINO_SDA_PIN,
       .frequency          = NRF_DRV_TWI_FREQ_100K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_lm75b_config, NULL, NULL);
    APP_ERROR_CHECK(err_code);

    nrf_drv_twi_enable(&m_twi);
}

in my main is the first lines is:

    APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
    NRF_LOG_DEFAULT_BACKENDS_INIT();

    NRF_LOG_INFO("\r\nTWI mems example started.");
    NRF_LOG_FLUSH();
    twi_init();

/* Initialize inertial sensors (IMU) driver interface */
  uint8_t i2c_add_mag = LSM9DS1_MAG_I2C_ADD_L;
  lsm9ds1_ctx_t dev_ctx_mag;
  dev_ctx_mag.write_reg = platform_write;
  dev_ctx_mag.read_reg = platform_read;
  dev_ctx_mag.handle = (void*)&i2c_add_mag;

  /* Initialize magnetic sensors driver interface */
  uint8_t i2c_add_imu = LSM9DS1_IMU_I2C_ADD_H;
  lsm9ds1_ctx_t dev_ctx_imu;
  dev_ctx_imu.write_reg = platform_write;
  dev_ctx_imu.read_reg = platform_read;
  dev_ctx_imu.handle = (void*)&i2c_add_imu;

other main function is equal like read_data_simple.c

my problem: is that I get NRF_BREAKPOINT_COND on 100th line from app_error_weak.c with NRF_LOG this message: <error> app: Fatal error