Uart1.rar_dma usart_stm32f103 DMA USART_stm32f103c8t6

//------------------------------------------------------------------- // Uart1.c // 串口通讯控制:用于内阻仪的通讯 //------------------------------------------------------------------- #include "System_Define.h" #include "DataProcess.h" #include "crc8.h" #include "uart1.h" Commu_Rec_Fmt CommBuff1; // 接收缓冲 结构体变量 uint08 UartTxBuff[UART_MAX_PACKET]; // 发送缓冲 uint08 UartRxBuff[UART_MAX_PACKET]; // 发送缓冲 __IO uint08 Flag_Uart_Send = 0; // 允许发送 //--------------------------------------------------------- // 初始化UART的接口和时钟 void Init_Uart1_IO(void) { GPIO_InitTypeDef PortDef; //----------------------------------------------------- // UART // TX PortDef.GPIO_Pin = USART1_TX_GPIO_PIN; PortDef.GPIO_Speed = USART1_TX_GPIO_SPEED; PortDef.GPIO_Mode = USART1_TX_GPIO_MODE; GPIO_Init(USART1_TX_GPIO_PORT,&PortDef); // RX PortDef.GPIO_Pin = USART1_RX_GPIO_PIN; PortDef.GPIO_Speed = USART1_RX_GPIO_SPEED; PortDef.GPIO_Mode = USART1_RX_GPIO_MODE; GPIO_Init(USART1_RX_GPIO_PORT,&PortDef); //----------------------------------------------------- } //------------------------------------------------------ // DMA发送中断设置 void Init_Uart_DMA(void) { NVIC_InitTypeDef NVIC_InitStructure; DMA_InitTypeDef DMA_InitStructure; //------------------------------------------------------------------ // DMA UART TX中断 //------------------------------------------------------------------ // 中断设置 NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); // 时钟 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //------------------------------------------------------------------ // DMA UART TX //------------------------------------------------------------------ // DMA1通道4配置 DMA_DeInit(DMA1_Channel4); // 外设地址 DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DR); // 内存地址 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)UartTxBuff; // dma传输方向单向 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; // 设置DMA在传输时缓冲区的长度 DMA_InitStructure.DMA_BufferSize = UART_MAX_PACKET; // 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; // 设置DMA的2个memory中的变量互相访问 DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel4,&DMA_InitStructure); // 中断允许 DMA_ITConfig(DMA1_Channel4,DMA_IT_TC,ENABLE); //------------------------------------------------------------------ // DMA UART RX //------------------------------------------------------------------ // DMA1通道5配置 DMA_DeInit(DMA1_Channel5); // 外设地址 DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DR); // 内存地址 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)UartRxBuff; // dma传输方向单向 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; // 设置DMA在传输时缓冲区的长度 DMA_InitStructure.DMA_BufferSize = UART_MAX_PACKET; // 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; // 设置DMA的2个memory中的变量互相访问 DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel5,&DMA_InitStructure); //使能通道5 DMA_Cmd(DMA1_Channel5,ENABLE); } // 初始化Uart void Init_Uart1(uint32 Baud) { USART_InitTypeDef USART_InitStructure; USART_ClockInitTypeDef USART_ClockInitStructure; NVIC_InitTypeDef NVIC_InitStructure; // IO口设置 Init_Uart1_IO(); // DMA处理 Init_Uart_DMA(); //------------------------------------------------------ // 时钟控制 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); // 清除参数 USART_DeInit(USART1); // 参数设定 USART_InitStructure.USART_BaudRate = Baud; 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; // 写入参数 USART_Init(USART1, &USART_InitStructure); // 时钟设定 USART_ClockInitStructure.USART_Clock = USART_Clock_Disable; USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low; USART_ClockInitStructure.USART_CPHA = USART_CPHA_1Edge; USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable; USART_ClockInit(USART1,&USART_ClockInitStructure); // 串口中断 //USART_ITConfig(USART1,USART_IT_TC,DISABLE); // //USART_ITConfig(USART1,USART_IT_RXNE,DISABLE); // 禁止接收中断 USART_ITConfig(USART1,USART_IT_IDLE,ENABLE); // // Enable the USART1 global Interrupt NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4 );//中断优先级分组，先占优先级4位，从占优先级0为 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); // DMA操作 USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE);// 使能UART1的DMA方式 USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE); // Enable the USART1 USART_Cmd(USART1, ENABLE); // 初始值 CommBuff1.Enb = 0; CommBuff1.Len = 0; } // 串口1DMA方式发送中断 void DMA1_Channel4_IRQHandler(void) { //清除标志位 DMA_ClearFlag(DMA1_FLAG_TC4); //关闭DMA DMA_Cmd(DMA1_Channel4,DISABLE); // 等待发送完成 while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET){} //允许再次发送 Flag_Uart_Send = 0; } // 串口发送一个包 void Uart1_Send_Packet(uint08 *buff,uint08 length) { uint08 i; // 等待发送完成 while(Flag_Uart_Send){} if(length<=UART_MAX_PACKET) { // 补充数据 UartTxBuff[0] = 0x4C; UartTxBuff[1] = 0xE2; UartTxBuff[2] = length+1; // 数据 for(i=0;i<length;i++) { UartTxBuff[i+3] = buff[i]; } // 校验 UartTxBuff[length+3] = CRC8(UartTxBuff+3,length); // 发送 Flag_Uart_Send = 1; DMA_SetCurrDataCounter(DMA1_Channel4,length+4); DMA_Cmd(DMA1_Channel4,ENABLE); } else { // 发送出错信息--数据溢出 SendErrInfo(_ERR_OVR); } } // 串口数据接收：中断处理 void USART1_IRQHandler(void) { uint32_t temp = 0; uint16_t i = 0; // 空闲中断 if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET) { // 清USART_IT_IDLE标志 temp = USART1->SR; temp = USART1->DR; DMA_Cmd(DMA1_Channel5,DISABLE); // 数据量 temp = UART_MAX_PACKET - DMA_GetCurrDataCounter(DMA1_Channel5); // 格式判断 if((UartRxBuff[0] == 0x70)&&(UartRxBuff[1] == 0x48)) { // 长度比较 if(UartRxBuff[2] == temp-3) { // 长度 CommBuff1.Len = UartRxBuff[2]; // 数据转移 for (i = 0;i < CommBuff1.Len; i++) { CommBuff1.Buf[i] = UartRxBuff[i+3]; } CommBuff1.Enb = 1; } } //设置传输数据长度 DMA_SetCurrDataCounter(DMA1_Channel5,UART_MAX_PACKET); //打开DMA DMA_Cmd(DMA1_Channel5,ENABLE); } }