Dual-mode for SPI module.

[Daniel]

Hi,

I am using nrf52810 and want to use the same SPI module as an SPI slave and master in the same application. Is it possible to change the SPI module role on the fly?

I got SPI slave working.

Now When I tried to configure the SPI as Master I got compilation error.

multiple definition of `SPIM0_SPIS0_SPI0_IRQHandler'; Output/ble_app_nrf52810 Release/Obj/nrfx_spis.o: \modules\nrfx\drivers\src/nrfx_spis.c:487: first defined here

I could not resolve the issue. 

[Daniel]

Looks like I made some progress after using PRS module. 

Now there is another issue I am facing. 

After Power On, I am configuring the SPIS module. It works fine. 

But when I uninit the module and init it back, it behaves weird. It keeps the MOSI pin low.  I did not configure the module as SPI Master. I just uninit it.

Attached the code

void init_spi_slave(void)
{
    nrf_drv_spis_config_t spis_config = NRF_DRV_SPIS_DEFAULT_CONFIG;
    spis_config.csn_pin               = SPIS_CS_PIN;
    spis_config.miso_pin              = SPI_MISO_PIN;
    spis_config.mosi_pin              = SPI_MOSI_PIN;
    spis_config.sck_pin               = SPI_SCK_PIN;

    APP_ERROR_CHECK(nrf_drv_spis_init(&spis, &spis_config, spis_event_handler));
    APP_ERROR_CHECK(nrf_drv_spis_buffers_set(&spis, p_spi_tx_buf, spi_buf_len, p_spi_rx_buf, spi_buf_len));
}

void uninit_spi_slave(void)
{
    nrf_drv_spis_uninit(&spis);
    //Added this later to fix but did not help
    nrf_gpio_cfg_input(SPIS_MISO_PIN, NRF_GPIO_PIN_NOPULL);
    nrf_gpio_cfg_input(SPIS_MOSI_PIN, NRF_GPIO_PIN_NOPULL);
    nrf_gpio_cfg_input(SPI_SCK_PIN, NRF_GPIO_PIN_NOPULL);
    nrf_gpio_cfg_input(SPIS_CS_PIN, NRF_GPIO_PIN_NOPULL);
}

Any idea? 

I tried to configure all the pins as input and then configure the module but it did not work either.

It works after reset. So something is causing the issue.

[Kenneth]

Can you try to do a hard reset of the peripheral between re-configuration:

*(volatile uint32_t *)0x40004FFC = 0;
*(volatile uint32_t *)0x40004FFC;
*(volatile uint32_t *)0x40004FFC = 1;