stm32f407串口1配置成DMA模式的代码怎么写

以下是配置 STM32F407 串口1 为 DMA 模式的代码:

#include "stm32f4xx.h"
#include "stm32f4xx_dma.h"
#include "stm32f4xx_usart.h"

#define RX_BUFFER_SIZE 16

uint8_t rx_buffer[RX_BUFFER_SIZE];

void init_usart_dma(void) {
    // Enable USART1 and DMA2 clocks
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);

    // Initialize USART1 TX and RX pins
    GPIO_InitTypeDef GPIO_InitStruct;
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    // Connect USART1 pins to AF7 (USART1)
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);

    // Initialize USART1 with baud rate 115200
    USART_InitTypeDef USART_InitStruct;
    USART_InitStruct.USART_BaudRate = 115200;
    USART_InitStruct.USART_WordLength = USART_WordLength_8b;
    USART_InitStruct.USART_StopBits = USART_StopBits_1;
    USART_InitStruct.USART_Parity = USART_Parity_No;
    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART1, &USART_InitStruct);

    // Configure DMA2 Stream 2 for USART1 RX
    DMA_InitTypeDef DMA_InitStruct;
    DMA_InitStruct.DMA_Channel = DMA_Channel_4;
    DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralToMemory;
    DMA_InitStruct.DMA_Memory0BaseAddr = (uint32_t)rx_buffer;
    DMA_InitStruct.DMA_BufferSize = RX_BUFFER_SIZE;
    DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR;
    DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStruct.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStruct.DMA_Priority = DMA_Priority_High;
    DMA_InitStruct.DMA_FIFOMode = DMA_FIFOMode_Disable;
    DMA_InitStruct.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;
    DMA_InitStruct.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStruct.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    DMA_Init(DMA2_Stream2, &DMA_InitStruct);

    // Enable USART1 RX DMA
    USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);

    // Enable DMA2 Stream 2
    DMA_Cmd(DMA2_Stream2, ENABLE);

    // Enable USART1
    USART_Cmd(USART1, ENABLE);
}

int main(void) {
    init_usart_dma();

    // Do something with DMA-buffered data
}