gd32f103串口dma接收

### GD32F103 UART DMA 接收示例代码 为了实现GD32F103通过UART使用DMA方式进行数据接收，可以按照如下方法配置硬件和软件环境。此过程涉及初始化DMA通道、设置UART外设以及编写中断服务程序来处理接收到的数据。 #### 初始化DMA和UART 首先，在启动文件中定义必要的宏并包含头文件： ```c #include "gd32f10x.h" ``` 接着，创建函数用于初始化DMA和USART: ```c void usart_dma_init(void){ /* Enable the peripheral clock */ rcu_periph_clock_enable(RCU_GPIOA); rcu_periph_clock_enable(RCU_USART1); rcu_periph_clock_enable(RCU_DMA); /* Configure GPIO pins for USART function */ gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_9); // TX gpio_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_10); // RX /* USART configuration */ usart_deinit(USART1); usart_baudrate_set(USART1, 115200U); usart_word_length_set(USART1, USART_WL_8BIT); usart_stop_bit_set(USART1, USART_STB_1BIT); usart_parity_config(USART1, USART_PM_NONE); usart_hardware_flow_rts_config(USART1, USART_RTS_DISABLE); usart_hardware_flow_cts_config(USART1, USART_CTS_DISABLE); usart_receive_config(USART1, USART_RECEIVE_ENABLE); usart_transmit_config(USART1, USART_TRANSMIT_ENABLE); usart_enable(USART1); } ``` 随后，针对DMA部分进行具体设定： ```c #define BUFFER_SIZE 64 uint8_t rx_buffer[BUFFER_SIZE]; void dma_usart_rx_init(){ /* Initialize DMA channel */ dma_parameter_struct dma_initstructure; dma_deinit(DMA0, DMA_CH2); dma_initstructure.direction = DMA_MEMORY_TO_PERIPHERAL; dma_initstructure.memory_addr = (uint32_t)rx_buffer; dma_initstructure.memory_inc = DMA_MEMORY_INCREASE_ENABLE; dma_initstructure.periph_memory_width = DMA_PERIPH_WIDTH_BYTE; dma_initstructure.number = BUFFER_SIZE; dma_initstructure.priority = DMA_PRIORITY_HIGH; dma_channel_subperipheral_select(DMA0, DMA_CH2, DMA_SUBPERIAPHSEL_USART_RX); dma_init(DMA0, DMA_CH2, &dma_initstructure); /* Enable DMA request on receive complete event */ usart_dma_receive_request_config(USART1, USART_DMARECEIVEREQUEST_ENABLE); /* Enable DMA channel interrupt */ nvic_irq_enable(DMA0_Channel2_IRQn, 0, 0); dma_interrupt_enable(DMA0, DMA_CH2, DMA_INT_FTF); /* Start DMA transfer */ dma_channel_enable(DMA0, DMA_CH2); } /* Interrupt service routine to handle DMA completion */ void DMA0_Channel2_IRQHandler(void){ if(dma_flag_get(DMA0, DMA_FLAG_FEIF_CH2)){ // Handle error here... } else{ // Process received data from buffer... // Clear flag after processing. dma_clear_flag(DMA0, DMA_FLAG_FTFIF_CH2 | DMA_FLAG_HTFIF_CH2 | DMA_FLAG_TEFIF_CH2); } } ``` 上述代码展示了如何利用DMA技术提高GD32F103系列MCU上USART接口的工作效率[^1]。当DMA传输完成时触发IRQ中断，可以在该ISR内部对接收到的信息做进一步解析或存储操作。