stm32f4串口3中断
时间: 2023-11-02 14:06:04 浏览: 85
在使用stm32f4串口3中断时,需要先使能相应的中断,并在中断服务函数中处理接收和发送数据。具体步骤如下:
1. 使能串口3中断:在NVIC中使能USART3_IRQn中断。
2. 配置串口3:设置波特率、数据位、停止位、校验位等参数。
3. 在中断服务函数中处理接收和发送数据:在USART3_IRQHandler()函数中,判断是接收中断还是发送中断,并进行相应的处理。
以下是一个简单的示例代码:
```
void USART3_IRQHandler(void)
{
if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) //接收中断
{
uint8_t data = USART_ReceiveData(USART3); //读取接收到的数据
//处理接收到的数据
}
else if(USART_GetITStatus(USART3, USART_IT_TXE) != RESET) //发送中断
{
USART_SendData(USART3, data); //发送数据
}
}
int main(void)
{
//使能串口3时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
//配置串口3
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);
//使能串口3中断
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);
//启动串口3
USART_Cmd(USART3, ENABLE);
while(1)
{
//主循环
}
}
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