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stm32看你是用什么的历程，如果是正点原子的话，本来串口一就可以通过快速把数据存入BUF中发送出去，不用等接受到数据，下面附上在其他串口都可以使用的发送函数，STM32f103 f409标准库通用的 void USART3_IRQHandler(void) { u8 res; if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)//接收到数据 { res =USART_ReceiveData(USART3); gizPutData(&res, 1);//数据写入到缓冲区 } } void Usart_SendByte( USART_TypeDef * pUSARTx, uint8_t ch) { /* 发送一个字节数据到USART */ USART_SendData(pUSARTx,ch); /* 等待发送数据寄存器为空 */ while (USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET); } //初始化IO 串口3 //pclk1:PCLK1时钟频率(Mhz) //bound:波特率 void usart3_init(u32 bound) { NVIC_InitTypeDef NVIC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //GPIOB时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); //串口3时钟使能 USART_DeInit(USART3); //复位串口3 //USART3_TX PB10 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; //PB10 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出 GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化PB10 //USART3_RX PB11 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PB11 USART_InitStructure.USART_BaudRate = bound; //波特率一般设置为9600; 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(USART3, &USART_InitStructure); //初始化串口3 USART_Cmd(USART3, ENABLE); //使能串口 //使能接收中断 USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); //开启中断 //设置中断优先级 NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=2 ;//抢占优先级3 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子优先级3 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 } |
