nrf_gpio_pin_write to SPI_MOSI

[JIYEON]

Hello,

In my board, nRF52832 is connected to other MCU.

And those two communicates via SPI. nRF52832 is master.

To synchronize two boards, MOSI pin has to be used.

But it seems like I can't write any value to MOSI pin.

Test code is like below.

    bool states = 0;

    while(1)
    {
      nrf_gpio_pin_write(PIN_NTM_SPI_MOSI, states);
      nrf_gpio_pin_write(PIN_NTM_SPI_SS, states);
      nrf_gpio_pin_write(PIN_LED3_ON, states);
      nrf_delay_ms(100);
      states ^= 1;
    }

LED is turned on/off correctly. And I checked that SPI_SS also works fine. 

But MOSI pin doesn't work.

Spi is configured like this.

nrf_drv_spi_config_t twi_config_ntm = NRF_DRV_SPI_DEFAULT_CONFIG;
    twi_config_ntm.sck_pin  = PIN_NTM_SPI_SCLK;
    twi_config_ntm.mosi_pin = PIN_NTM_SPI_MOSI;
    twi_config_ntm.miso_pin = PIN_NTM_SPI_MISO;
    //twi_config_motions.ss_pin = PIN_LSM_SPI_SS;
    twi_config_ntm.frequency = NRF_SPI_FREQ_8M;
    twi_config_ntm.mode      = NRF_DRV_SPI_MODE_0;
    twi_config_ntm.bit_order = NRF_DRV_SPI_BIT_ORDER_MSB_FIRST;
    twi_config_ntm.irq_priority = APP_IRQ_PRIORITY_LOW;
    err_code = nrf_drv_spi_init(&m_spi_ntm, &twi_config_ntm, spi_event_handler1, NULL);
    RETURN_IF_ERROR(err_code);

Since other MCU that is connected to nRF is very old and tricky to change SW,

I wish to find a way to write MOSI pin.

[Jared]

Hi,

Are you writing to the pin with the GPIO peripheral after or before you have initialized the SPIM peripheral? In general, only one peripheral should drive a pin at a time. Alternatively you should another pin for the GPIO peripheral and connect them externally with the MOSI pin. 

regards

Jared