STM32串口通讯完美收发变长字节程序

stillhaveroom · 发表于 2015-4-17 15:40:19

[mw_shl_code=c,true]串口配置代码 __IO uint8_t RS485_RxBuffer[256]; __IO uint8_t RS485_RXCount=0; void RS485Config(enum USARTxNumber RS485Number,uint32_t usrBaudRate) { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; switch(RS485Number) { case RS485_2: RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); //使能外设时钟 //使能串口2的发送和接收和中断 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); // Enable the USART2 Interrupt NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); /* */ //GPIO结构的成员设置如下： /*--------------485控制端初始化*/ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOD, &GPIO_InitStructure); GPIO_ResetBits(GPIOD, GPIO_Pin_11); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //485_TX 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); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; //485_RX GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入 GPIO_Init(GPIOA, &GPIO_InitStructure); //串口的结构成员设置如下： USART_InitStructure.USART_BaudRate = usrBaudRate; 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_Tx | USART_Mode_Rx; USART_Init(USART2, &USART_InitStructure); /* Enable the USART Receive interrupt: this interrupt is generated when the USART receive data register is not empty */ USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); USART_Cmd(USART2, ENABLE);// USART2 Enable break; case RS485_3: /* 使能 USART3 时钟*/ RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD, ENABLE); //使能外设时钟 /* //使能串口3的发送和接收中断 NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); //Enable the USART3 Interrupt NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOD, &GPIO_InitStructure); GPIO_ResetBits(GPIOD, GPIO_Pin_12); /* USART3 使用IO端口配置 */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入 GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化GPIO /* USART3 工作模式配置 */ USART_InitStructure.USART_BaudRate = usrBaudRate; //波特率设置 USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位数设置：8位 USART_InitStructure.USART_StopBits = USART_StopBits_1; //停止位设置：1位 USART_InitStructure.USART_Parity = USART_Parity_No ; //是否奇偶校验：无 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //硬件流控制模式设置：没有使能 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//接收与发送都使能 USART_Init(USART3, &USART_InitStructure); //初始化USART3 /* Enable the USART Receive interrupt: this interrupt is generated when the USART receive data register is not empty */ //USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); USART_Cmd(USART3, ENABLE);// USART3 Enable break; case RS485_4: RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4 ,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE); RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOD, ENABLE); /* //Configure the NVIC Preemption Priority Bits NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); // Enable the UART4 Interrupt NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOD, &GPIO_InitStructure); GPIO_ResetBits(GPIOD, GPIO_Pin_13); /* USART4 GPIO config */ /* Configure USART4 Tx (PC.10) as alternate function push-pull */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOC, &GPIO_InitStructure); /* Configure USART4 Rx (PC.11) as input floating */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOC, &GPIO_InitStructure); /* USART4 mode config */ USART_InitStructure.USART_BaudRate = usrBaudRate; 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(UART4, &USART_InitStructure); //USART_ITConfig(UART4, USART_IT_RXNE, ENABLE); USART_Cmd(UART4, ENABLE); break; } 数据接收中断代码： #include "485Ctrl.h" extern uint8_t RS485_RxBuffer[256]; extern uint8_t RS485_RXCount; void USART2_IRQHandler(void) { if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) { USART_ClearITPendingBit(USART2, USART_IT_RXNE); RS485_RxBuffer[RS485_RXCount++]=USART_ReceiveData(USART2); USART_ITConfig(USART2, USART_IT_IDLE, ENABLE); } //如果为空闲总线中断 if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET) { USART_ITConfig(USART2, USART_IT_IDLE, DISABLE); USART_ClearITPendingBit(USART2, USART_IT_IDLE); //处理接收到的数据代码略 RS485_RXCount=0; } }[/mw_shl_code]