GD32H7-SPI-DMA-SYNC

GD32H7-SPI-DMA-SYNC

spi3 exit0 falling edge 触发同步；

void spi_dma_sync_config()
{
    /**SPI3: PE5--MISO,PE6--MOSI,PE2--SCK,PE4--NSS3 */
    rcu_periph_clock_enable(RCU_GPIOE);
    gpio_af_set(GPIOE, GPIO_AF_5, GPIO_PIN_2 | GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_6);
    gpio_mode_set(GPIOE, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_2 | GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_6);
    gpio_output_options_set(GPIOE, GPIO_OTYPE_PP, GPIO_OSPEED_100_220MHZ, GPIO_PIN_2 | GPIO_PIN_4 | GPIO_PIN_5 | GPIO_PIN_6);

    //spi config
    rcu_periph_clock_enable(RCU_SPI3);
    rcu_spi_clock_config(IDX_SPI3, RCU_SPISRC_APB2);
    spi_i2s_deinit(SPI3);
    spi_parameter_struct spi_init_struct;

    spi_struct_para_init(&spi_init_struct);
    spi_init_struct.trans_mode = SPI_TRANSMODE_FULLDUPLEX;
    spi_init_struct.device_mode = SPI_MASTER;
    spi_init_struct.data_size = SPI_DATASIZE_8BIT;
    spi_init_struct.clock_polarity_phase = SPI_CK_PL_LOW_PH_2EDGE;
    spi_init_struct.nss = SPI_NSS_HARD;
    spi_init_struct.prescale = SPI_PSC_32;//300M/8=37.5MHZ,300M/16=18.75MHZ
    spi_init_struct.endian = SPI_ENDIAN_MSB;
    spi_init(SPI3, &spi_init_struct);
    // spi_master_receive_clock_delay_set(SPI3, 15);//0.5ns*20
    spi_byte_access_enable(SPI3);//使能按字节访问
    /* enable SPI NSS output ,is important for spi3*/

    spi_nss_output_enable(SPI3);
    // spi_current_data_num_config(SPI3, 1);
    spi_enable(SPI3);
    spi_dma_enable(SPI3, SPI_DMA_TRANSMIT);
    spi_master_transfer_start(SPI3, SPI_TRANS_START);

    //dma config
    rcu_periph_clock_enable(RCU_DMA0);
    rcu_periph_clock_enable(RCU_DMAMUX);

    dma_single_data_parameter_struct dma_init_struct;
    dma_single_data_para_struct_init(&dma_init_struct);
    dmamux_sync_parameter_struct dmamux_sync_init_struct;
    dmamux_sync_struct_para_init(&dmamux_sync_init_struct);
    dma_deinit(DMA0, DMA_CH6);
    dma_init_struct.request = DMA_REQUEST_SPI3_TX;
    dma_init_struct.direction = DMA_MEMORY_TO_PERIPH;
    dma_init_struct.memory0_addr = (uint32_t)ms1005_dma_txbuf;
    dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
    dma_init_struct.periph_memory_width = DMA_PERIPH_WIDTH_8BIT;
    dma_init_struct.number = 5;
    dma_init_struct.periph_addr = (uint32_t)&SPI_TDATA(SPI3);
    dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
    dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
    dma_single_data_mode_init(DMA0, DMA_CH6, &dma_init_struct);
    dma_circulation_enable(DMA0, DMA_CH6);
    /* DMAMUX channle config */
    dmamux_sync_init_struct.sync_id = DMAMUX_SYNC_EXTI0;//PE3
    dmamux_sync_init_struct.sync_polarity = DMAMUX_SYNC_FALLING;
    dmamux_sync_init_struct.request_number = 2;
    dmamux_synchronization_init(DMAMUX_MUXCH6, &dmamux_sync_init_struct);
    dmamux_synchronization_enable(DMAMUX_MUXCH6);

    SCB_CleanDCache_by_Addr((uint32_t *)ms1005_dma_txbuf, 32);
    dma_channel_enable(DMA0, DMA_CH6);
}

注意这几个的dma配置的顺序，要先使能spi，再配置dma;

还需要打开中断，一定要使能中断才可以；

void exit_sync_config()
{
    rcu_periph_clock_enable(RCU_GPIOA);
    rcu_periph_clock_enable(RCU_SYSCFG);
    gpio_mode_set(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO_PIN_0);
    syscfg_exti_line_config(EXTI_SOURCE_GPIOA, EXTI_SOURCE_PIN0);
    exti_init(EXTI_0, EXTI_INTERRUPT, EXTI_TRIG_FALLING);
    nvic_irq_enable(EXTI0_IRQn, 2, 0);
}

main.c:

exit_sync_config();
spi_dma_sync_config();

之后，按下按键，就可以触发DMA传输，测试如下：

上面配置的同步请求数量request_number为2，也就是每次按键触发2次dma传输，每次传输1个字节；这里也可以用突发模式； 而上面配置的dma_init_struct.number = 5;则表示要发送的数组中只有前5个有效，当memory0_addr为+5时，会自动回到最初的地址；