STM32F103RCT6配置串口3收发中断
时间: 2023-12-03 20:44:00 浏览: 23
好的,以下是配置串口3收发中断的步骤:
1. 首先需要打开USART3的时钟。可以通过RCC_APB1PeriphClockCmd()函数实现。例如:
```
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
```
2. 配置USART3的GPIO引脚。USART3的TX引脚为PB10,RX引脚为PB11。可以通过GPIO_Init()函数实现。例如:
```
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
```
3. 配置USART3的基本参数。可以通过USART_Init()函数实现。例如:
```
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 115200;
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(USART3, &USART_InitStructure);
```
4. 配置USART3的中断。可以通过NVIC_Init()和USART_ITConfig()函数实现。例如:
```
NVIC_InitTypeDef NVIC_InitStructure;
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);
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
```
5. 编写USART3的中断服务函数USART3_IRQHandler()。例如:
```
void USART3_IRQHandler(void)
{
if (USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
{
// 接收中断
uint8_t data = USART_ReceiveData(USART3);
// 处理接收到的数据
// ...
}
if (USART_GetITStatus(USART3, USART_IT_TXE) != RESET)
{
// 发送中断
// ...
}
}
```
6. 最后,在主函数中启动USART3。例如:
```
USART_Cmd(USART3, ENABLE);
```
以上就是配置串口3收发中断的步骤。需要注意的是,在编写中断服务函数时,要根据实际应用需求进行相应的处理。