GD32DMA发送代码

void init_uart_test1(void)
{
dma_single_data_parameter_struct dma_init_struct;
/* enable GPIO clock */
rcu_periph_clock_enable(RCU_GPIOA);

/* enable USART clock */
rcu_periph_clock_enable(RCU_USART0);

/* connect port to USARTx_Tx */
gpio_af_set(GPIOA, GPIO_AF_7, GPIO_PIN_9);

/* connect port to USARTx_Rx */
gpio_af_set(GPIOA, GPIO_AF_7, GPIO_PIN_10);

/* connect port to USARTx_Tx */
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_9);
/* connect port to USARTx_Rx */
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_10);
gpio_output_options_set(GPIOA,GPIO_OTYPE_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_9|GPIO_PIN_10);


/* enable DMA1 */
rcu_periph_clock_enable(RCU_DMA1);
/* USART configure */
usart_deinit(USART0);   
usart_baudrate_set(USART0, 115200U);    
usart_word_length_set(USART0, USART_WL_8BIT);
usart_stop_bit_set(USART0, USART_STB_1BIT);
usart_parity_config(USART0, USART_PM_NONE);
usart_hardware_flow_rts_config(USART0, USART_RTS_DISABLE);
usart_hardware_flow_cts_config(USART0, USART_CTS_DISABLE);
usart_receive_config(USART0, USART_RECEIVE_ENABLE);
usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);
usart_enable(USART0);

/* deinitialize DMA channel7(USART0 tx) */
dma_deinit(DMA1, DMA_CH7);
dma_init_struct.direction = DMA_MEMORY_TO_PERIPH;
dma_init_struct.memory0_addr = (uint32_t)txbuffer;
dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
dma_init_struct.periph_memory_width = DMA_PERIPH_WIDTH_8BIT;
dma_init_struct.number = ARRAYNUM(txbuffer);
dma_init_struct.periph_addr = USART0_DATA_ADDRESS;
dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
dma_single_data_mode_init(DMA1, DMA_CH7, dma_init_struct);
/* configure DMA mode */
dma_circulation_disable(DMA1, DMA_CH7);
dma_channel_subperipheral_select(DMA1, DMA_CH7, DMA_SUBPERI4);
/* enable DMA channel7 */
dma_channel_enable(DMA1, DMA_CH7);

/* USART DMA enable for transmission and reception */
usart_dma_transmit_config(USART0, USART_DENT_ENABLE);
usart_dma_receive_config(USART0, USART_DENR_ENABLE);
while (RESET == dma_flag_get(DMA1, DMA_CH7, DMA_INTF_FTFIF))
    ;
dma_flag_clear(DMA1,DMA_CH7,DMA_INTF_FTFIF);

// /* enable NVIC request /
// nvic_irq_enable(USART0_IRQn, 0, 1);
// / enable USART0 receive interrupt /
// usart_interrupt_enable(USART0, USART_INTEN_RBNEIE); / 使能USART0读区非空中断 /
// usart_interrupt_enable(USART0, USART_INTEN_IDLEIE); / 使能USART0空闲中断 */
}
void send_dma_data(void)
{
uint32_t len;
dma_flag_clear(DMA1,DMA_CH7,DMA_INTF_FTFIF);

dma_channel_disable(DMA1, DMA_CH7);
sprintf((char*)txbuffer,"12e12412e12e12e1asdbijwe  fewhuifneqw daoou219r32jj8f23 2e1e1e1e21\r\n");
dma_memory_address_config(DMA1, DMA_CH7,DMA_MEMORY_0, (uint32_t)txbuffer); //设置要发送数据的内存地址
len = sizeof(txbuffer);
dma_transfer_number_config(DMA1, DMA_CH7, len);                        //一共发多少个数据

dma_channel_enable(DMA1, DMA_CH7);
/* USART DMA enable for transmission and reception */
usart_dma_transmit_config(USART0, USART_DENT_ENABLE); //使能串口DMA发送
while (RESET == dma_flag_get(DMA1, DMA_CH7, DMA_INTF_FTFIF))
    ;
dma_flag_clear(DMA1,DMA_CH7,DMA_INTF_FTFIF);

}