Questions about spi read and write function mapping

[June6]

I'm having trouble driving the BMI088 with the official driver of Bosch BMI088 (link to this driver) in the ble_app_uart routine. I never get the chip ID. Bosch BMI088 official driver link address: https://github.com/BoschSensortec/BMI08x-Sensor-API . The spi read and write functions are encapsulated into the following two APIs: 

int8_t user_spi_write(uint8_t cs_pin, uint8_t reg_addr, uint8_t *data, uint16_t len);

int8_t user_spi_read(uint8_t cs_pin, uint8_t reg_addr, uint8_t *data, uint16_t len);

So How can I map these two APIs into Nordic operation functions？ 

  

And The automatic selection between [CPOL = '0' and CPHA = '0'] and [CPOL = '1' and CPHA = '1'] is controlled based on the value of SCK after a falling edge of CSB (1 or 2). What SPI mode should I configure？

[June6]

At present, in the process of communicating with the BMI088 sensor, I suspect that the spi read and write commands are abnormal. In order to determine that the function mapping I made is not a problem, I will paste a piece of function mapping code below.

/*!
 *  @brief Function for reading the sensor's registers through SPI bus.
 *
 *  @param[in] cs_pin   : Chip selection pin.
 *  @param[in] reg_addr : Register address.
 *  @param[in] data     : Pointer to the data buffer to store the read data.
 *  @param[in] len      : No of bytes to read.
 *
 *  @return Status of execution
 *  @retval 0 -> Success
 *  @retval >0 -> Failure Info
 *
 */
int8_t user_bmi088_spi_write(uint8_t cs_pin, uint8_t reg_addr, uint8_t *data, uint16_t len)
{
    if (cs_pin == MCU_GPIO_BMI088_CSB1)
    {
        nrf_gpio_pin_set(MCU_GPIO_BMI088_CSB2);
        nrf_gpio_pin_clear(MCU_GPIO_BMI088_CSB1);
    }
    else if (cs_pin == MCU_GPIO_BMI088_CSB2)
    {
        nrf_gpio_pin_set(MCU_GPIO_BMI088_CSB1);
        nrf_gpio_pin_clear(MCU_GPIO_BMI088_CSB2);
    }
    else if ((cs_pin != MCU_GPIO_BMI088_CSB1) && (cs_pin != MCU_GPIO_BMI088_CSB2))
    {
        return -2;
    }
    nrf_delay_us(1);
    if (len <= 32)
    {
        uint8_t m_tx_buf[33] = {0};
        m_tx_buf[0] = reg_addr;
        uint8_t m_tx_length = ((uint8_t)len) + 1;
//        const uint8_t m_rx_length = 0;
        memcpy(&m_tx_buf[1], &data, len);

        spi_bmi088_xfer_done = false;

        APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi_0, m_tx_buf, m_tx_length, NULL, 0));
        while(!spi_bmi088_xfer_done)
        {
            __WFE();
        }
    }
    else
    {
        NRF_LOG_INFO("Spi write over length.");
    }
    nrf_delay_us(1);
    nrf_gpio_pin_set(cs_pin);

    return 0;
}


/*!
 *  @brief Function for writing the sensor's registers through SPI bus.
 *
 *  @param[in] cs_pin   : Chip selection pin.
 *  @param[in] reg_addr : Register address.
 *  @param[out]data     : Pointer to the data buffer whose value is to be written.
 *  @param[in] len      : No of bytes to write.
 *
 *  @return Status of execution
 *  @retval 0 -> Success
 *  @retval >0 -> Failure Info
 *
 */
int8_t user_bmi088_spi_read(uint8_t cs_pin, uint8_t reg_addr, uint8_t *data, uint16_t len)
{
    if (cs_pin == MCU_GPIO_BMI088_CSB1)
    {
        nrf_gpio_pin_set(MCU_GPIO_BMI088_CSB2);
        nrf_gpio_pin_clear(MCU_GPIO_BMI088_CSB1);
    }
    else if (cs_pin == MCU_GPIO_BMI088_CSB2)
    {
        nrf_gpio_pin_set(MCU_GPIO_BMI088_CSB1);
        nrf_gpio_pin_clear(MCU_GPIO_BMI088_CSB2);
    }
    else if ((cs_pin != MCU_GPIO_BMI088_CSB1) && (cs_pin != MCU_GPIO_BMI088_CSB2))
    {
        return -2;
    }
    nrf_delay_us(1);
    if (len <= 32)
    {
        uint8_t m_tx_buf[1] = {reg_addr};
        uint8_t m_tx_length = 1;
        uint8_t m_rx_length = (uint8_t)len;
				
        spi_bmi088_xfer_done = false;

        APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi_0, m_tx_buf, m_tx_length, data, m_rx_length));
        while(!spi_bmi088_xfer_done)
        {
            __WFE();
        }
    }
    else
    {
        NRF_LOG_INFO("Spi read over length.");
    }
    nrf_delay_us(1);
    nrf_gpio_pin_set(cs_pin);

    return 0;
}

[June6]

Are the above function mapping operations normal?

Which engineer can answer me？

[June6]

please reply to me quickly！

Thanks！

[haakonsh]

Where do you set spi_bmi088_xfer_done after the transfer is complete?

what SDK and driver are you using?

[June6]

peripheral\spi