STM32F207串口DMA模式(串口中断bug稳定性)
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使用DMA操作UART4：
一、DMA映射表
见下表：
UART4的发送 UART4_TX 在Stream4。
UART4的接收 UART4_RX在Stream2。
他们在Channel_4。
二、程序代码
unsigned char btDMARecbuf[255];// DMA接收数据地址
unsigned char btDMASendbuf[255];//DMA发送数据地址
// 初始化
void UartDMA()
{
//定义中断结构体
NVIC_InitTypeDef NVIC_InitStructure ;
//定义IO初始化结构体
GPIO_InitTypeDef GPIO_InitStructure;
//定义串口结构体
USART_InitTypeDef USART_InitStructure;
//定义DMA结构体
DMA_InitTypeDef DMA_InitStructure;
USART_DeInit(UART4); // 串口4
DMA_DeInit(DMA1_Stream2); // 接收
DMA_DeInit(DMA1_Stream4); // 发送
//设置IO口时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
GPIO_PinAFConfig(GPIOC,GPIO_PinSource10,GPIO_AF_UART4);
GPIO_PinAFConfig(GPIOC,GPIO_PinSource11,GPIO_AF_UART4);
//管脚模式:输出口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
//类型:推挽模式
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
//上拉下拉设置
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
//IO口速度
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
//管脚指定
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_10;
//初始化
GPIO_Init(GPIOC, &GPIO_InitStructure);
//管脚模式:输入口
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
//上拉下拉设置
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
//管脚指定
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_11;
//初始化
GPIO_Init(GPIOC, &GPIO_InitStructure);
//打开串口对应的外设时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE);
//串口发 - DMA配置
//启动DMA时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
//DMA发送中断设置
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//DMA通道配置
DMA_InitStructure.DMA_Channel = DMA_Channel_4;
//外设地址
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&UART4->DR);
//内存地址
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)btDMASendbuf;
//dma传输方向
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
//设置DMA在传输时缓冲区的长度
DMA_InitStructure.DMA_BufferSize = 255;
//设置DMA的外设递增模式，一个外设
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
//设置DMA的内存递增模式
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
//外设数据字长
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
//内存数据字长
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;
//设置DMA的传输模式
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
//设置DMA的优先级别
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
//指定如果FIFO模式或直接模式将用于指定的流 ： 不使能FIFO模式
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
//指定了FIFO阈值水平
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
//指定的Burst转移配置内存传输
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
//指定的Burst转移配置外围转移 */
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
//配置DMA1的通道
DMA_Init(DMA1_Stream4, &DMA_InitStructure);
//使能中断
DMA_ITConfig(DMA1_Stream4, DMA_IT_TC, ENABLE);
//串口收 - DMA配置
DMA_InitStructure.DMA_Channel = DMA_Channel_4;
//外设地址
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&UART4->DR);
//内存地址
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)btDMARecbuf;
//dma传输方向
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
//设置DMA在传输时缓冲区的长度
DMA_InitStructure.DMA_BufferSize = 255;
//设置DMA的外设递增模式，一个外设
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
//设置DMA的内存递增模式
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
//外设数据字长
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
//内存数据字长
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
//设置DMA的传输模式
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
//设置DMA的优先级别
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
//指定如果FIFO模式或直接模式将用于指定的流 ： 不使能FIFO模式
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
//指定了FIFO阈值水平
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
//指定的Burst转移配置内存传输
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
//指定的Burst转移配置外围转移 */
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
//配置DMA1的通道
DMA_Init(DMA1_Stream2, &DMA_InitStructure);
//使能通道
DMA_Cmd(DMA1_Stream2, ENABLE);
//初始化串口参数
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_InitStructure.USART_BaudRate = 115200;
//初始化串口
USART_Init(UART4, &USART_InitStructure);
//配置中断
NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn; //通道设置为串口中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //中断占先等级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //中断响应优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //打开中断
NVIC_Init(&NVIC_InitStructure);
//采用DMA方式发送
USART_DMACmd(UART4, USART_DMAReq_Tx, ENABLE);
//采用DMA方式接收
USART_DMACmd(UART4, USART_DMAReq_Rx, ENABLE);
//中断配置
USART_ITConfig(UART4, USART_IT_TC, DISABLE);
USART_ITConfig(UART4, USART_IT_RXNE, DISABLE);
USART_ITConfig(UART4, USART_IT_TXE, DISABLE);
USART_ITConfig(UART4, USART_IT_IDLE, ENABLE);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_ITConfig(UART4, USART_IT_PE, ENABLE); //开启PE错误接收中断Bit 8PEIE: PE interrupt enable
USART_ITConfig(UART4, USART_IT_ERR, ENABLE);//CR2 开启ERR中断
//启动串口
USART_Cmd(UART4, ENABLE);
while(!DMA_GetCmdStatus(DMA1_Stream4))
{
DMA_Cmd(DMA1_Stream4, ENABLE);
}
while(!DMA_GetCmdStatus(DMA1_Stream2))
{
DMA_Cmd(DMA1_Stream2, ENABLE);
}
}
// 发送
void UartSend(uint8_t *data, uint8_t size)
{
unsigned char i;
//复制数据
for (i=0; i { btDMASendbuf[i] = data[i]; } //设置传输数据长度 DMA_SetCurrDataCounter(DMA1_Stream4, size); //打开DMA, 开始发送 DMA_Cmd(DMA1_Stream4, ENABLE); } // DMA发送中断处理函数 void DMA1_Stream4_IRQHandler(void) { if(DMA_GetITStatus(DMA1_Stream4, DMA_IT_TCIF4) != RESET) { //清除标志位 DMA_ClearFlag(DMA1_Stream4, DMA_FLAG_TCIF4); //关闭DMA DMA_Cmd(DMA1_Stream4, DISABLE); //打开发送完成中断, 发送最后两个字节 USART_ITConfig(UART4, USART_IT_TC, ENABLE); } } // 串口中断处理函数 void UART4_IRQHandler(void) { unsigned char i; unsigned char len = 0; //发送完成中断处理 if(USART_GetITStatus(UART4, USART_IT_TC) != RESET) { //关闭发送完成中断 USART_ITConfig(UART4, USART_IT_TC, DISABLE); } //接
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