how to close the spi interface

[steven]

hi, now ,i have save the power,so need to close the spi interface at some time. but when i call follow function (hal_spi_disable). it see not close the spi interface,

if any issue about this?

uint32_t hal_spi_disable(SPIModuleNumber module_number)
{
    switch (module_number)
    {
        case SPI0:
            NRF_SPI0->ENABLE = (SPI_ENABLE_ENABLE_Disabled << SPI_ENABLE_ENABLE_Pos);
            break;
        case SPI1:
            NRF_SPI1->ENABLE = (SPI_ENABLE_ENABLE_Disabled << SPI_ENABLE_ENABLE_Pos);
            break;
        default:
            return NRF_ERROR_INVALID_PARAM;
    }
    
    return NRF_SUCCESS;
}

[steven]

hi,

when i disable the spi interface , i have reconfigure the GPIO. i will check my system .

2. follow hal_spi.c file , so it will be not reconfigure i/o when disable the spi interface.

// Disable SPI when it's not in use spi_base->ENABLE = (SPI_ENABLE_ENABLE_Disabled << SPI_ENABLE_ENABLE_Pos);

bool hal_spi_tx_rx(uint32_t *spi_base_address, uint16_t transfer_size, const uint8_t *tx_data, uint8_t *rx_data)
{
    uint32_t counter = 0;
    uint16_t number_of_txd_bytes = 0;
    uint32_t SEL_SS_PINOUT;

    NRF_SPI_Type *spi_base = (NRF_SPI_Type *)spi_base_address;

    SEL_SS_PINOUT = spi_base == NRF_SPI0 ? spi0_pins.ss_pin : spi1_pins.ss_pin;
    
    // Enable SPI
    spi_base->ENABLE = (SPI_ENABLE_ENABLE_Enabled << SPI_ENABLE_ENABLE_Pos);

    /* enable slave (slave select active low) */
    nrf_gpio_pin_clear(SEL_SS_PINOUT);

    while(number_of_txd_bytes < transfer_size)
    {
        spi_base->TXD = (uint32_t)(tx_data[number_of_txd_bytes]);

        /* Wait for the transaction complete or timeout (about 10ms - 20 ms) */
        while ((spi_base->EVENTS_READY == 0U) && (counter < TIMEOUT_COUNTER))
        {
            counter++;
        }

        if (counter == TIMEOUT_COUNTER)
        {
            /* timed out, disable slave (slave select active low) and return with error */
            nrf_gpio_pin_set(SEL_SS_PINOUT);
            spi_base->ENABLE = (SPI_ENABLE_ENABLE_Disabled << SPI_ENABLE_ENABLE_Pos);
            return false;
        }
        else
        {   /* clear the event to be ready to receive next messages */
            spi_base->EVENTS_READY = 0U;
        }

        rx_data[number_of_txd_bytes] = (uint8_t)spi_base->RXD;
        number_of_txd_bytes++;
    };

    /* disable slave (slave select active low) */
    nrf_gpio_pin_set(SEL_SS_PINOUT);

    // Disable SPI when it's not in use
    spi_base->ENABLE = (SPI_ENABLE_ENABLE_Disabled << SPI_ENABLE_ENABLE_Pos);
    
    return true;
}