f407串口2dma接受数据
时间: 2024-03-11 14:51:41 浏览: 15
您好,关于STM32F407串口2使用DMA接收数据的步骤如下:
1.配置串口2的GPIO引脚,使其作为串口2的TX和RX引脚。
2.初始化串口2,设置波特率、数据位、停止位等参数。
3.使能串口2的DMA接收功能,并配置DMA的通道、缓冲区、数据长度等参数。
4.启动DMA接收,并等待DMA传输完成中断。
5.在DMA传输完成中断中处理接收到的数据。
下面是具体的代码实现:
```
//配置串口2的GPIO引脚
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
/* 打开GPIO时钟 */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* 打开USART时钟 */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
/* 打开DMA时钟 */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
/* 配置TX引脚 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 配置RX引脚 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 将GPIO引脚与USART2的TX、RX功能映射 */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);
//初始化USART2
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART2, &USART_InitStructure);
//使能USART2的DMA接收功能
USART_DMACmd(USART2, USART_DMAReq_Rx, ENABLE);
//配置DMA通道、缓冲区和数据长度
DMA_InitStructure.DMA_Channel = DMA_Channel_4;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART2->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Receive_Buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = RX_BUFFER_SIZE;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream5, &DMA_InitStructure);
//启动DMA传输
DMA_Cmd(DMA1_Stream5, ENABLE);
//等待DMA传输完成中断
while (DMA_GetFlagStatus(DMA1_Stream5, DMA_FLAG_TCIF5) == RESET);
//处理接收到的数据
for (i = 0; i < RX_BUFFER_SIZE; i++)
{
Process_Received_Data(Receive_Buffer[i]);
}
```
以上是基本的实现步骤,您需要根据具体的需求对其中的参数进行调整。
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