QSPI pins in 52840

RE: QSPI pins in 52840

pipixia_8_8 — Tue, 25 Aug 2020 05:20:20 GMT

hi,i m use the qspi's pin as the spi ‘s pin,but the pin have no ware,the project i use is

nordic sdk\nRF5_SDK_16.0.0_98a08e2\examples\peripheral\spi

and i modify the pin map of spi:

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.ss_pin   = SPI_SS_PIN;
    spi_config.miso_pin = 22/*SPI_MISO_PIN*/;
    spi_config.mosi_pin = 21/*SPI_MOSI_PIN*/;
    spi_config.sck_pin  = SPI_SCK_PIN;
    APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));

    NRF_LOG_INFO("SPI example started.");

    while (1)
    {
        // Reset rx buffer and transfer done flag
        memset(m_rx_buf, 0, m_length);
        spi_xfer_done = false;

        APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, m_tx_buf, m_length, m_rx_buf, m_length));

        while (!spi_xfer_done)
        {
            __WFE();
        }

        NRF_LOG_FLUSH();

   //     bsp_board_led_invert(BSP_BOARD_LED_0);
        nrf_delay_ms(200);
    }
}

and i cant see the ware in the pin of p0.21 and p0.22.the chip is nrf52840,so i dont known whay it cant delect ware.

RE: QSPI pins in 52840

farooq — Fri, 10 May 2019 13:50:10 GMT

Thank you so much for the quick reply.

I will check with my hardware dept.

RE: QSPI pins in 52840

Simonr — Fri, 10 May 2019 11:56:59 GMT

Hi Farooq

The recommendations in table 143 are just that, recommendations. So you can configure any of the GPIO pins as QSPI. However the pins recommended for low freq I/O only could interfere with the radio performance if used for high frequency operations, such as the QSPI. So you can use any GPIOs except P0.10, P1.06, P0.09, P1.03, P1.07, P1.05, P1.02, P1.04 and P1.01 without any problems what so ever.

If you are not using the radio simultaneously as the QSPI you can use these pins as well.

Best regards,

Simon