分享一个串口用DMA方式的程序，可以用中断也可以用DMA方式

xujun · 发表于 2018-9-27 15:33:57

#include "bsp_uart.h"
#if uart1_enable
uart_par uart1;
#endif
#if uart2_enable
uart_par uart2;
#endif
#if uart3_enable
uart_par uart3;
#endif
#if uart4_enable
uart_par uart4;
#endif
#if uart1_enable //如果使能了串口1
/*
* 函数名：bsp_init_uart1
* 参数：输入的波特率
* 解释：可以启用DMA方式传输
*/
void bsp_init_uart1(uint16_t bound)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
#if uart1_dma_enable //启用DMA
DMA_InitTypeDef DMA_InitStructure;
#endif
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
#if uart1_dma_enable
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
#endif
GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_OverSampling8Cmd(USART1, ENABLE);
USART_InitStructure.USART_BaudRate = bound;
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(USART1, &USART_InitStructure);
#if uart1_dma_enable
DMA_InitStructure.DMA_BufferSize = 512 ;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable ;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull ;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single ;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_PeripheralBaseAddr =(uint32_t) (&(USART1->DR)) ;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
/* Configure TX DMA */
DMA_InitStructure.DMA_Channel = DMA_Channel_4 ;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral ;
DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)(uart1.txbuf);
DMA_Init(DMA2_Stream7,&DMA_InitStructure);
DMA_Cmd(DMA2_Stream7,ENABLE);
/* Configure RX DMA */
DMA_InitStructure.DMA_Channel = DMA_Channel_4 ;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory ;
DMA_InitStructure.DMA_Memory0BaseAddr =(uint32_t)uart1.rxbuf;
DMA_Init(DMA2_Stream5,&DMA_InitStructure);
DMA_Cmd(DMA2_Stream5,ENABLE);
USART_ITConfig(USART1, USART_IT_IDLE, ENABLE); //使能串口空闲中断
DMA_ITConfig(DMA2_Stream7,DMA_IT_TC,ENABLE); //使能DMA发送中断
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream7_IRQn; //配置DMA发送中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢断优先级为1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //配置USART为中断源
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 4; //抢断优先级为1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//采用DMA方式发送
USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE);
//采用DMA方式接收
USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE);
#else //采用中断方式接收数据
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //使能接收中断
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //配置USART为中断源
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //抢断优先级为1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#endif
/* 使能串口 */
USART_Cmd(USART1, ENABLE);
}
/*
* 函数名：uart1_send
* 参数：发送数据的长度
* 解释：DMA发送方式要注意填充的字节的长度
*/
void uart1_send(uint16_t len)
{
#if uart1_dma_enable
//关中断 ,如果有485需要进行设置为发送
DMA_Cmd(DMA2_Stream7, DISABLE ); //关闭USART1 TX DMA1 所指示的通道
DMA_SetCurrDataCounter(DMA2_Stream7,len); //DMA通道的DMA缓存的大小
DMA_Cmd(DMA2_Stream7, ENABLE); //使能USART1 TX DMA1 所指示的通道
//开中断
#else
uint16_t i = 0;
for(i=0;i<;en;i++)
{
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1,uart1.txbuf[i]);
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
}
#endif
}
#if uart1_dma_enable
/*
* 函数名：DMA2_Stream7_IRQHandler
* 参数：DMA发送完成中断
* 解释：
*/
void DMA2_Stream7_IRQHandler(void)
{
//发送数据完成进入中断，进行保护操作，如果有485控制收发，在此处进行设置
if(DMA_GetITStatus(DMA2_Stream7,DMA_IT_TCIF7))
{
DMA_ClearFlag(DMA2_Stream7,DMA_IT_TCIF7);
DMA_Cmd(DMA2_Stream7,DISABLE);
}
}
#endif
/*
* 函数名：USART1_IRQHandler
* 参数：串口中断
* 解释：
*/
void USART1_IRQHandler(void)
{
#if uart1_dma_enable
uint16_t num = 0;
/* USART in DMA mode */
if (USART_GetITStatus(USART1, USART_IT_IDLE) == SET)
{
DMA_Cmd(DMA2_Stream5,DISABLE);
num = USART1->SR;
num = USART1->DR;
num = 512- DMA_GetCurrDataCounter(DMA2_Stream5);
uart1.rxcon = num; //记录数组的长度
DMA_ClearFlag(DMA2_Stream5,DMA_FLAG_TCIF5 | DMA_FLAG_FEIF5 | DMA_FLAG_DMEIF5 | DMA_FLAG_TEIF5 | DMA_FLAG_HTIF5);//清除DMA2_Steam7传输完成标志
DMA_SetCurrDataCounter(DMA2_Stream5, 512);
DMA_Cmd(DMA2_Stream5, ENABLE); //打开DMA,
//进行发送信号量等操作
uart1.flag = 1;
}
#else
/* USART in Transmitter mode */
if (USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
{
uart1.rxbuf[uart1.rxcon++] = USART_ReceiveData(USART1);
//进行数据的处理
}
#endif
}
#endif //uart1 end