Snippet code for read manufacturer and device ID of W25X32 SPI NOR Flash on NuttX

This simple snippet of code demonstrate how to read the manufacturer and the device ID of a W32X32 SPI Nor flash using NuttX RTOS :

int spi_nor_flash(void)
{
        uint8_t tx[6], rx[6];

        struct spi_dev_s *spi = up_spiinitialize(0);

        SPI_SETBITS(spi, 8);

        tx[0] = 0x90;
        tx[1] = 0;
        tx[2] = 0;
        tx[3] = 0;
        tx[4] = 0;
        tx[5] = 0;

        kl_gpiowrite(PIN_SPI0_CS, false);
        SPI_EXCHANGE(spi, &tx, &rx, 6);
        kl_gpiowrite(PIN_SPI0_CS, true);

        printf("Manuf. = 0x%02X | Device = 0x%02X\n", rx[4], rx[5]);

        return 0;
}