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如何去实现基于stm32f103zet6的串口使用DMA发送数据呢

问答对人有帮助，内容完整，我也想知道答案 0 如何去实现基于STM32f103zet6的串口使用DMA发送数据呢？ 0
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答案对人有帮助，有参考价值 0 stm32f10x串口通讯基于stm32f103zet6 串口发送使用DMA发送大致说明 USART_Rx_Sbuffer二维数组 -> 串口接收缓存区一共3行 Rx_SbufferSize 列 ,Rx_SbufferSize由宏定义。 0,1,2行分别是串口1,2,3的接收缓存,由串口中断将接收到的数据存入对应的缓存区中。可以使用Usart_Read()函数来读取缓存区的内容,(返回的是对应缓存区的首地址),特别注意! 每行第1个元素表示的式该行接收到的数据个数,并不是接收到的数据！读取到内容(或帧)后,可以使用USART_Push()和USART_Clear()来清除缓存区。 USART_Tx_Sbuffer二维数组 -> 串口DMA发送缓存区一共3行 Tx_SbufferSize 列,Tx_SbufferSize 由宏定义。 0,1,2行是表示串口1,2,3的发送缓存,由串口发送函数Usart_Send()将要发送的数据存入对应的缓存区中。特别注意! 每行第1个元素表示的式该行要发送的数据的个数,并不是要发送的数据,同时具有DMA在忙标志位的作用,在忙标志由DMA中断清除 bsp_usart.c #include "bsp_usart.h" void BSP_Usart_Init(void) { USART_GPIO_Init(); //串口GPIO初始化 USART_Config(); //串口配置 USART_NVIC_Config(); //串口接收中断配置 USART_DMA_Config(); //串口发送DMA和DMA中断配置 //使能串口 for(uint8_t temp=0;temp<3;temp++) USART_Cmd(Target_Usart[temp],ENABLE); } void USART_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9 \| GPIO_Pin_2; GPIO_Init(GPIOA,&GPIO_InitStruct); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10; GPIO_Init(GPIOB,&GPIO_InitStruct); GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10 \| GPIO_Pin_3; GPIO_Init(GPIOA,&GPIO_InitStruct); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_11; GPIO_Init(GPIOB,&GPIO_InitStruct); } void USART_Config(void) { USART_InitTypeDef USART_InitStruct; RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); USART_InitStruct.USART_BaudRate = 115200; USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStruct.USART_Mode = USART_Mode_Rx \| USART_Mode_Tx; USART_InitStruct.USART_Parity = USART_Parity_No; USART_InitStruct.USART_StopBits = USART_StopBits_1; USART_InitStruct.USART_WordLength = USART_WordLength_8b; for(uint8_t temp=0;temp<3;temp++) USART_Init(Target_Usart[temp],&USART_InitStruct); } void USART_NVIC_Config(void) { NVIC_InitTypeDef NVIC_InitStruct; NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 1; NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0; NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn; NVIC_Init(&NVIC_InitStruct); NVIC_InitStruct.NVIC_IRQChannel = USART2_IRQn; NVIC_Init(&NVIC_InitStruct); NVIC_InitStruct.NVIC_IRQChannel = USART3_IRQn; NVIC_Init(&NVIC_InitStruct); //设置串口中断类型 USART_ITConfig(USART1,USART_IT_RXNE,ENABLE); USART_ITConfig(USART2,USART_IT_RXNE,ENABLE); USART_ITConfig(USART3,USART_IT_RXNE,ENABLE); //清除中断标志位 USART_ClearITPendingBit(USART1,USART_IT_RXNE); USART_ClearITPendingBit(USART2,USART_IT_RXNE); USART_ClearITPendingBit(USART3,USART_IT_RXNE); } void USART_DMA_Config(void) { DMA_InitTypeDef DMA_InitStruct; RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2,ENABLE); DMA_InitStruct.DMA_BufferSize = 0; DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStruct.DMA_M2M = DMA_M2M_Disable; DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStruct.DMA_Mode = DMA_Mode_Normal; DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStruct.DMA_Priority = DMA_Priority_Medium; //设置DMA的地址 for(uint8_t temp=0;temp<3;temp++) { DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&Target_Usart[temp]->DR; DMA_InitStruct.DMA_MemoryBaseAddr = (uint32_t)&USART_Tx_Sbuffer[temp][1]; DMA_Init(TargetDMA_Channel[temp],&DMA_InitStruct); //初始化DMA USART_DMACmd(Target_Usart[temp],USART_DMAReq_Tx,ENABLE); //设置串口DMA类型(发送) DMA_ClearFlag(DMA1_FLAG_TC1); //清除标志位 } NVIC_InitTypeDef NVIC_InitStruct; NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 8; NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0; NVIC_InitStruct.NVIC_IRQChannel = DMA1_Channel4_IRQn; NVIC_Init(&NVIC_InitStruct); NVIC_InitStruct.NVIC_IRQChannel = DMA1_Channel7_IRQn; NVIC_Init(&NVIC_InitStruct); NVIC_InitStruct.NVIC_IRQChannel = DMA1_Channel2_IRQn; NVIC_Init(&NVIC_InitStruct); //使能DMA通道 for(uint8_t temp=0;temp<3;temp++) DMA_ITConfig(TargetDMA_Channel[temp],DMA_IT_TC,ENABLE); } void USART_Push(uint8_t USARTx,uint8_t len) { if(USART_Rx_Sbuffer[USARTx-1][0] > len) { uint8_t temp; USART_Rx_Sbuffer[USARTx-1][0] -= len; for(temp=0; tempCNDTR = len; TargetDMA_Channel[USARTx-1]->CCR \|= DMA_CCR1_EN; return 0; } return 1; } uint8_t Usart_BusyCheck(uint8_t USARTx) { if(USART_Tx_Sbuffer[USARTx-1][0] != 0) return 1; else return 0; } uint8_tUsart_Read(uint8_t USARTx) { return USART_Rx_Sbuffer[USARTx-1]; } void Rx_SbufferInput(uint8_t USARTx,uint8_t dat) { //判断缓存区是否满载 if(USART_Rx_Sbuffer[USARTx-1][0] < Rx_SbufferSize-1) { USART_Rx_Sbuffer[USARTx-1][ USART_Rx_Sbuffer[USARTx-1][0]+1 ] = dat; USART_Rx_Sbuffer[USARTx-1][0]++; }else USART_Rx_Sbuffer[USARTx-1][0] = Rx_SbufferSize; } void Tx_Flag_Clear(uint8_t USARTx) { USART_Tx_Sbuffer[USARTx-1][0] = 0; } int fputc (int c, FILE fp) { while(Usart_BusyCheck(1)); //防止和DMA冲突 USART_SendData(USART1,c); while(USART_GetFlagStatus(USART1,USART_FLAG_TXE) == RESET); return c; } bsp_usart.h #ifndef _BSP_USART_H_ #define _BSP_USART_H_ #include "stm32f10x.h" #include //定义缓存大小 #define Rx_SbufferSize 64 #define Tx_SbufferSize 64 //每行第一个元素表示该缓存区存放的数据个数 static uint8_t USART_Rx_Sbuffer[3][Rx_SbufferSize] = {{0},{0},{0}}; static uint8_t USART_Tx_Sbuffer[3][Tx_SbufferSize] = {{0},{0},{0}}; static USART_TypeDef* Target_Usart[3] = {USART1,USART2,USART3}; static DMA_Channel_TypeDef* TargetDMA_Channel[3] = {DMA1_Channel4,DMA1_Channel7,DMA1_Channel2}; //初始化 void BSP_Usart_Init(void); void USART_GPIO_Init(void); void USART_Config(void); void USART_NVIC_Config(void); void USART_DMA_Config(void); //发送&接收 uint8_tUsart_Read(uint8_t USARTx); uint8_t Usart_Send(uint8_t USARTx,uint8_t dat,uint8_t len); uint8_t Usart_BusyCheck(uint8_t USARTx); //检查DMA是否在忙 void USART_Clear(uint8_t USARTx); //清除接收缓存区 void USART_Push(uint8_t USARTx,uint8_t len); //将缓存区前移len个字节 void Rx_SbufferInput(uint8_t USARTx,uint8_t dat); //将接收到的dat载入对应缓冲区 void Tx_Flag_Clear(uint8_t USARTx); //清除DMA发送在忙(软件) //printf()重定向 int fputc (int c, FILE *fp); #endif isr.c #include "isr.h" #include "bsp_usart.h" //extern SemaphoreHandle_t Usart_Rx_Flag; void USART1_IRQHandler(void) { //BaseType_t temp = pdFALSE; if(USART_GetITStatus(USART1,USART_IT_RXNE) == SET) { Rx_SbufferInput(1,USART_ReceiveData(USART1)); USART_ClearITPendingBit(USART1,USART_IT_RXNE); } } void USART2_IRQHandler(void) { if(USART_GetITStatus(USART1,USART_IT_RXNE) == SET) { Rx_SbufferInput(2,USART_ReceiveData(USART2)); USART_ClearITPendingBit(USART2,USART_IT_RXNE); } } void USART3_IRQHandler(void) { if(USART_GetITStatus(USART3,USART_IT_RXNE) == SET) { Rx_SbufferInput(3,USART_ReceiveData(USART3)); USART_ClearITPendingBit(USART3,USART_IT_RXNE); } } void DMA1_Channel4_IRQHandler(void) { if(DMA_GetITStatus(DMA1_IT_TC4) == SET) { Tx_Flag_Clear(1); TargetDMA_Channel[0]->CCR &= (uint16_t)(~DMA_CCR1_EN); DMA_ClearITPendingBit(DMA1_IT_TC4); } } void DMA1_Channel7_IRQHandler(void) { if(DMA_GetITStatus(DMA1_IT_TC7) == SET) { Tx_Flag_Clear(2); TargetDMA_Channel[1]->CCR &= (uint16_t)(~DMA_CCR1_EN); DMA_ClearITPendingBit(DMA1_IT_TC7); } } void DMA1_Channel2_IRQHandler(void) { if(DMA_GetITStatus(DMA1_IT_TC2) == SET) { Tx_Flag_Clear(3); TargetDMA_Channel[2]->CCR &= (uint16_t)(~DMA_CCR1_EN); DMA_ClearITPendingBit(DMA1_IT_TC2); } }

2021-12-7 14:40:01 评论举报高博