Function configure

bsp/at32/libraries/rt_drivers/drv_spi.c:121–250

}

static rt_err_t configure(struct rt_spi_device* device,
                          struct rt_spi_configuration* configuration)
{
    struct rt_spi_bus * spi_bus = (struct rt_spi_bus *)device->bus;
    struct at32_spi *instance = (struct at32_spi *)spi_bus->parent.user_data;

    spi_init_type spi_init_struct;

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

    at32_msp_spi_init(instance->config->spi_x);

    /* data_width */
    if(configuration->data_width <= 8)
    {
        spi_init_struct.frame_bit_num = SPI_FRAME_8BIT;
    }
    else if(configuration->data_width <= 16)
    {
        spi_init_struct.frame_bit_num = SPI_FRAME_16BIT;
    }
    else
    {
        return -RT_EIO;
    }

    /* baudrate */
    {
        uint32_t spi_apb_clock;
        uint32_t max_hz;
        crm_clocks_freq_type clocks_struct;

        max_hz = configuration->max_hz;

        crm_clocks_freq_get(&clocks_struct);
        LOG_D("sys freq: %d\n", clocks_struct.sclk_freq);
        LOG_D("max freq: %d\n", max_hz);

        if (instance->config->spi_x == SPI1)
        {
            spi_apb_clock = clocks_struct.apb2_freq;
            LOG_D("pclk2 freq: %d\n", clocks_struct.apb2_freq);
        }
        else
        {
            spi_apb_clock = clocks_struct.apb1_freq;
            LOG_D("pclk1 freq: %d\n", clocks_struct.apb1_freq);
        }

        if(max_hz >= (spi_apb_clock / 2))
        {
            spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_2;
        }
        else if (max_hz >= (spi_apb_clock / 4))
        {
            spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_4;
        }