nRF52840 Receiving bad Device ID from ADXL362

RE: nRF52840 Receiving bad Device ID from ADXL362

Zada — Thu, 30 Jan 2020 17:15:22 GMT

It ended up that I need to set the H0H1 for the MOSI and SCK pins after the nrf_spi_init() function call. I am getting 0xAD out for the device id now.

 APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));

nrf_gpio_cfg(spi_config.sck_pin, NRF_GPIO_PIN_DIR_OUTPUT, NRF_GPIO_PIN_INPUT_DISCONNECT, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_H0H1, NRF_GPIO_PIN_NOSENSE);
nrf_gpio_cfg(spi_config.mosi_pin, NRF_GPIO_PIN_DIR_OUTPUT, NRF_GPIO_PIN_INPUT_DISCONNECT, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_H0H1, NRF_GPIO_PIN_NOSENSE);

RE: nRF52840 Receiving bad Device ID from ADXL362

Zada — Wed, 29 Jan 2020 23:20:58 GMT

In the other case it was recommended setting the clock and miso lines to H0H1. I added these lines to the main file.

nrf_gpio_cfg(spi_config.sck_pin, NRF_GPIO_PIN_DIR_OUTPUT, NRF_GPIO_PIN_INPUT_DISCONNECT, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_H0H1, NRF_GPIO_PIN_NOSENSE);
nrf_gpio_cfg(spi_config.miso_pin, NRF_GPIO_PIN_DIR_INPUT, NRF_GPIO_PIN_INPUT_CONNECT, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_H0H1, NRF_GPIO_PIN_NOSENSE);

int main(void)
{
    bsp_board_init(BSP_INIT_LEDS);

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

    nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
    spi_config.frequency = NRF_DRV_SPI_FREQ_125K;
//    spi_config.frequency = NRF_DRV_SPI_FREQ_250K;
//    spi_config.frequency = NRF_DRV_SPI_FREQ_1M;
    spi_config.mode = NRF_DRV_SPI_MODE_0;
    spi_config.bit_order = NRF_DRV_SPI_BIT_ORDER_MSB_FIRST;
//    spi_config.ss_pin   = SPI_SS_PIN;
//    spi_config.miso_pin = SPI_MISO_PIN;
//    spi_config.mosi_pin = SPI_MOSI_PIN;
//    spi_config.sck_pin  = SPI_SCK_PIN;
    spi_config.ss_pin   = ADXL362_CS_PIN;
    spi_config.orc      = 0xCC;
    spi_config.miso_pin = ADXL362_MISO_PIN;
    
    spi_config.mosi_pin = ADXL362_MOSI_PIN;
    spi_config.sck_pin  = ADXL362_SCK_PIN;

    nrf_gpio_cfg(spi_config.sck_pin, NRF_GPIO_PIN_DIR_OUTPUT, NRF_GPIO_PIN_INPUT_DISCONNECT, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_H0H1, NRF_GPIO_PIN_NOSENSE);
    nrf_gpio_cfg(spi_config.miso_pin, NRF_GPIO_PIN_DIR_INPUT, NRF_GPIO_PIN_INPUT_CONNECT, NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_H0H1, NRF_GPIO_PIN_NOSENSE);

    APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));

//    NRF_GPIO_Type * reg2 = nrf_gpio_pin_port_decode(ADXL362_MISO_PIN);
//    reg2->PIN_CNF[ADXL362_MISO_PIN] |= (NRF_GPIO_PIN_H0H1 << GPIO_PIN_CNF_DRIVE_Pos);

    NRF_LOG_INFO("SPI example started.");

//    soft_reset(&spi_config);

    while (1)
    {
      device_id(&spi_config);
    }
}

Now I am getting 0xBF out and my MISO line appears to be picking up minor noise from the SCK line.

Any other thoughts on how to get this working?

RE: nRF52840 Receiving bad Device ID from ADXL362

Jørgen Holmefjord — Wed, 29 Jan 2020 20:39:00 GMT

It seems that others have been facing similar issues before.

RE: nRF52840 Receiving bad Device ID from ADXL362

Zada — Wed, 29 Jan 2020 19:24:58 GMT

It was previously set to 1 and I have changed it to 0

// <o> NRF_SPI_DRV_MISO_PULLUP_CFG - MISO PIN pull-up configuration.

// <0=> NRF_GPIO_PIN_NOPULL

// <1=> NRF_GPIO_PIN_PULLDOWN

// <3=> NRF_GPIO_PIN_PULLUP

#ifndef NRF_SPI_DRV_MISO_PULLUP_CFG

#define NRF_SPI_DRV_MISO_PULLUP_CFG 0 // previously = 1

#endif

Now I get 0x90 out from the ADXL362

RE: nRF52840 Receiving bad Device ID from ADXL362

Jørgen Holmefjord — Wed, 29 Jan 2020 19:16:50 GMT

Hi,

Can you check what the config NRF_SPI_DRV_MISO_PULLUP_CFG is set to in your sdk_config.h file? If not set to this already, please try to set it to 0 (NRF_GPIO_PIN_NOPULL).

Best regards,
Jørgen