stm32f103rc软件开发 (2) 串口操作

stm32

keil

下面贴的是主函数，做的就是将串口1进行配置，配置成中断的方式然后while 1int main(void){  /* System Clocks Configuration */  RCC_Configuration();         /* NVIC configuration */  NVIC_Configuration();  /* Configure the GPIO ports */  GPIO_Configuration();  USART_InitStructure.USART_BaudRate = 9600;  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;  /* Configure USART1 */  USART_Init(USART1, &USART_InitStructure);    /* Enable USART1 Receive and Transmit interrupts */  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);    /* Enable the USART1 */  USART_Cmd(USART1, ENABLE);  while (1)  {  }}

RCC的配置如下void RCC_Configuration(void){  SystemInit();    /* Enable USART1, GPIOA, GPIOx and AFIO clocks */  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA  | RCC_APB2Periph_AFIO, ENABLE);}串口1是PA9 PA10所以要打开 RCC_APB2Periph_GPIOA 用到串口1要打开RCC_APB2Periph_USART1 串口1是复用功能要打开RCC_APB2Periph_AFIO

GPIO的设置void GPIO_Configuration(void){  GPIO_InitTypeDef GPIO_InitStructure;  /* Configure USART1 Rx (PA.10) as input floating */  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  GPIO_Init(GPIOA, &GPIO_InitStructure);    /* Configure USART1 Tx (PA.09) as alternate function push-pull */  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  GPIO_Init(GPIOA, &GPIO_InitStructure);}只用到串口1 配置 PA9为输入因为是串口收   PA10为输出因为是串口发送

中断的配置void NVIC_Configuration(void){  NVIC_InitTypeDef NVIC_InitStructure;  /* Configure the NVIC Preemption Priority Bits */    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);    /* Enable the USART1 Interrupt */  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  NVIC_Init(&NVIC_InitStructure);}

串口中断的函数编写  stm32f10x_it.c文件中void USART1_IRQHandler(void){  if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)  {    /* Read one byte from the receive data register */    RxBuffer1[0] = USART_ReceiveData(USART1);   if(USART_GetITStatus(USART1, USART_IT_TXE) == RESET)   {         USART_SendData(USART1, RxBuffer1[0]);    }}这里做了一个读一个data然后将这个data发送出去。即收到什么发送什么。测试时可以将stm32通过TTL转232芯片连在电脑上，电脑端打开串口工具进行发送一个data的测试。看看是否可以收回这个相同的data。