stm32f103rc软件开发 (2) 串口操作
1、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 1
int 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)
{
}
}
2、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
3、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
4、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);
}
5、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。
