DMA方式可以节约CPU资源,不用像串口查询或中断方式处理数据时需要按下暂停键，处理完才接着往下走，反正牛X就是了。但我得提一句，如果用的不是ST的MCU。有可能会导致芯片运行不了这个串口DMA配置的程序，目前测得GD可用，HK航顺不行。
1. 串口1初始化配置
volatile uint16_t com1_rx_len = 0; //接收帧数据的长度
volatile uint8_t com1_recv_end_flag = 0; //帧数据接收完成标
uint8_t com1_rx_buffer[USART_MAX_LEN]={0};//接收数据缓存
uint8_t DMA_USART1_TX_BUF[400]; //发送数据缓存
void USART1_Config(u32 bound)//同时配置接收和发送
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//1时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
//2GPIO USART1_TX GPIOA.9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9
//USART1_RX GPIOA.10初始化
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10
USART_DeInit(USART1);
//3中断 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;//抢占优先级2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //子优先级1
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn; //嵌套通道为DMA1_Channel4_IRQn
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢占优先级为 2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4+3; //响应优先级为 7
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //通道中断使能
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn ;//串口1发送中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 5+3; //子优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure);
//4配置 USART设置
USART_InitStructure.USART_BaudRate = bound;//串口波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(USART1, &USART_InitStructure); //初始化串口1
USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);
USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);
USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE);
USART_Cmd(USART1,ENABLE);
DMA_InitTypeDef DMA_Initstructure;
/*开启DMA时钟*/
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
DMA_DeInit(DMA1_Channel5);
/*DMA配置*/
DMA_Initstructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DR);;
DMA_Initstructure.DMA_MemoryBaseAddr = (u32)com1_rx_buffer;
DMA_Initstructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_Initstructure.DMA_BufferSize = USART_MAX_LEN;
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_Normal;
DMA_Initstructure.DMA_Priority = DMA_Priority_High;
DMA_Initstructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel5,&DMA_Initstructure);
DMA_InitTypeDef DMA_InitStructure;
DMA_DeInit(DMA1_Channel4); //初始化DMA1
/* 配置DMA1 USART1发送 */
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&USART1->DR);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)DMA_USART1_TX_BUF;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = 0;
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_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel4, &DMA_InitStructure);//初始化
//启动DMA
DMA_Cmd(DMA1_Channel4,ENABLE);
//开启DMA发送发成中断
DMA_ITConfig(DMA1_Channel4,DMA_IT_TC,ENABLE);
DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);
USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);
DMA_Cmd(DMA1_Channel5,ENABLE);
}
2. 串口1中断处理函数
void USART1_IRQHandler(void) //串口1中断服务程序
{
/* 使用串口DMA空闲接收 */
if(USART_GetITStatus(USART1,USART_IT_IDLE)!=RESET) //空闲中断触发
{
com1_recv_end_flag=1; //接收完成标志
DMA_Cmd(DMA1_Channel5, DISABLE); /* 暂时关闭dma，数据尚未处理 */
com1_rx_len = USART_MAX_LEN - DMA_GetCurrDataCounter(DMA1_Channel5);/* 获取接收到的数据长度 单位为字节*/
USART_ClearITPendingBit(USART1,USART_IT_IDLE);
DMA_SetCurrDataCounter(DMA1_Channel5,USART_MAX_LEN);/* 重新赋值计数值，必须大于等于最大可能接收到的数据帧数目 */
DMA_Cmd(DMA1_Channel5, ENABLE); /*打开DMA*/
USART_ReceiveData(USART1);//清除空闲中断标志位（接收函数有清标志位的作用）
}
/* 检查DMA发送完成，关闭TC标志位 */
if(USART_GetFlagStatus(USART1,USART_IT_TXE)==RESET) //串口发送完成
{
USART_ITConfig(USART1,USART_IT_TC,DISABLE);
}
}
3. 串口1DMA发送中断和应用函数
void DMA1_Channel4_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_IT_TC4))
{
DMA_ClearITPendingBit(DMA1_IT_TC4); // 清除传输完成中断标志位
DMA_Cmd(DMA1_Channel4,DISABLE);
DMA1_Channel4->CNDTR=0; // 清除数据长度
USART_ITConfig(USART1,USART_IT_TC,ENABLE); //打开串口发送完成中断
}
}
void DMA_USART1_Send(uint8_t *data,u16 size)//串口1DMA发送函数
{
DMA_Cmd(DMA1_Channel4, DISABLE);
memcpy(DMA_USART1_TX_BUF, data, size);
while (DMA_GetCurrDataCounter(DMA1_Channel4)); // 检查DMA发送通道内是否还有数据
DMA_SetCurrDataCounter(DMA1_Channel4, size); // 重新写入要传输的数据数量
DMA_Cmd(DMA1_Channel4, ENABLE); // 启动DMA发送
}
4. 各个通道的DMA1请求表
代码都自己测试过能使用，想着当初得翻遍整个CSDN才能凑齐能用的代码太麻烦了，自己先整合起来以防将来要用！
版权声明：本文为CSDN博主「宽_kuan」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/hekuan5826/article/details/122648197
DMA方式可以节约CPU资源,不用像串口查询或中断方式处理数据时需要按下暂停键，处理完才接着往下走，反正牛X就是了。但我得提一句，如果用的不是ST的MCU。有可能会导致芯片运行不了这个串口DMA配置的程序，目前测得GD可用，HK航顺不行。
1. 串口1初始化配置
volatile uint16_t com1_rx_len = 0; //接收帧数据的长度
volatile uint8_t com1_recv_end_flag = 0; //帧数据接收完成标
uint8_t com1_rx_buffer[USART_MAX_LEN]={0};//接收数据缓存
uint8_t DMA_USART1_TX_BUF[400]; //发送数据缓存
void USART1_Config(u32 bound)//同时配置接收和发送
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
//1时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
//2GPIO USART1_TX GPIOA.9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.9
//USART1_RX GPIOA.10初始化
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;//PA10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.10
USART_DeInit(USART1);
//3中断 NVIC 配置
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;//抢占优先级2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //子优先级1
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn; //嵌套通道为DMA1_Channel4_IRQn
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢占优先级为 2
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4+3; //响应优先级为 7
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //通道中断使能
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn ;//串口1发送中断通道
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢占优先级
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 5+3; //子优先级
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure);
//4配置 USART设置
USART_InitStructure.USART_BaudRate = bound;//串口波特率
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
USART_Init(USART1, &USART_InitStructure); //初始化串口1
USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);
USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);
USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE);
USART_Cmd(USART1,ENABLE);
DMA_InitTypeDef DMA_Initstructure;
/*开启DMA时钟*/
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
DMA_DeInit(DMA1_Channel5);
/*DMA配置*/
DMA_Initstructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DR);;
DMA_Initstructure.DMA_MemoryBaseAddr = (u32)com1_rx_buffer;
DMA_Initstructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_Initstructure.DMA_BufferSize = USART_MAX_LEN;
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_Normal;
DMA_Initstructure.DMA_Priority = DMA_Priority_High;
DMA_Initstructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel5,&DMA_Initstructure);
DMA_InitTypeDef DMA_InitStructure;
DMA_DeInit(DMA1_Channel4); //初始化DMA1
/* 配置DMA1 USART1发送 */
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&USART1->DR);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)DMA_USART1_TX_BUF;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = 0;
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_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel4, &DMA_InitStructure);//初始化
//启动DMA
DMA_Cmd(DMA1_Channel4,ENABLE);
//开启DMA发送发成中断
DMA_ITConfig(DMA1_Channel4,DMA_IT_TC,ENABLE);
DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);
USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);
DMA_Cmd(DMA1_Channel5,ENABLE);
}
2. 串口1中断处理函数
void USART1_IRQHandler(void) //串口1中断服务程序
{
/* 使用串口DMA空闲接收 */
if(USART_GetITStatus(USART1,USART_IT_IDLE)!=RESET) //空闲中断触发
{
com1_recv_end_flag=1; //接收完成标志
DMA_Cmd(DMA1_Channel5, DISABLE); /* 暂时关闭dma，数据尚未处理 */
com1_rx_len = USART_MAX_LEN - DMA_GetCurrDataCounter(DMA1_Channel5);/* 获取接收到的数据长度 单位为字节*/
USART_ClearITPendingBit(USART1,USART_IT_IDLE);
DMA_SetCurrDataCounter(DMA1_Channel5,USART_MAX_LEN);/* 重新赋值计数值，必须大于等于最大可能接收到的数据帧数目 */
DMA_Cmd(DMA1_Channel5, ENABLE); /*打开DMA*/
USART_ReceiveData(USART1);//清除空闲中断标志位（接收函数有清标志位的作用）
}
/* 检查DMA发送完成，关闭TC标志位 */
if(USART_GetFlagStatus(USART1,USART_IT_TXE)==RESET) //串口发送完成
{
USART_ITConfig(USART1,USART_IT_TC,DISABLE);
}
}
3. 串口1DMA发送中断和应用函数
void DMA1_Channel4_IRQHandler(void)
{
if(DMA_GetITStatus(DMA1_IT_TC4))
{
DMA_ClearITPendingBit(DMA1_IT_TC4); // 清除传输完成中断标志位
DMA_Cmd(DMA1_Channel4,DISABLE);
DMA1_Channel4->CNDTR=0; // 清除数据长度
USART_ITConfig(USART1,USART_IT_TC,ENABLE); //打开串口发送完成中断
}
}
void DMA_USART1_Send(uint8_t *data,u16 size)//串口1DMA发送函数
{
DMA_Cmd(DMA1_Channel4, DISABLE);
memcpy(DMA_USART1_TX_BUF, data, size);
while (DMA_GetCurrDataCounter(DMA1_Channel4)); // 检查DMA发送通道内是否还有数据
DMA_SetCurrDataCounter(DMA1_Channel4, size); // 重新写入要传输的数据数量
DMA_Cmd(DMA1_Channel4, ENABLE); // 启动DMA发送
}
4. 各个通道的DMA1请求表
代码都自己测试过能使用，想着当初得翻遍整个CSDN才能凑齐能用的代码太麻烦了，自己先整合起来以防将来要用！
版权声明：本文为CSDN博主「宽_kuan」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/hekuan5826/article/details/122648197
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