Function configure

bsp/loongson/ls2kdev/drivers/drv_spi.c:141–180

2 4 8 16 32 64 128 256 512 1024 2048 4096

const static unsigned char SPI_DIV_TABLE[] = {0b0000, 0b0001, 0b0100, 0b0010, 0b0011, 0b0101, 0b0110, 0b0111, 0b1000, 0b1001, 0b1010, 0b1011};
// 2      4      8      16     32     64      128   256    512    1024   2048   4096
static rt_err_t configure(struct rt_spi_device *device,
                          struct rt_spi_configuration *configuration)
{

    unsigned char cpol = 0;
    unsigned char cpha = 0;

    RT_ASSERT(NULL != device);
    RT_ASSERT(NULL != configuration);

    // baudrate
    if (configuration->mode & RT_SPI_CPOL)      // cpol
    {
        cpol = 1;
    }
    else
    {
        cpol = 0;
    }
    if (configuration->mode & RT_SPI_CPHA)      // cpha
    {
        cpha = 1;
    }
    else
    {
        cpha = 0;
    }

    float spi_max_speed = ((float)APB_MAX_SPEED) / (8.0 / (float)APB_FREQSCALE);
    uint64_t div = (uint64_t)(spi_max_speed / (float)configuration->max_hz);
    int ctr = 0;
    while (div != 1 && ctr < 12)
    {
        ctr++;
        div = div >> 1;
    }
    spi_init(SPI_DIV_TABLE[ctr], cpol, cpha);

    return RT_EOK;
}

static rt_uint32_t xfer(struct rt_spi_device *device, struct rt_spi_message *message)
{