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GD32F4XX串口接收中断和闲时中断配置
2022-07-06 14:29:00 【fangye945a】
最近在调试GD32F4xx,想使用串口的闲时中断,发现与STM32有些区别。在此做个记录,备忘,防止重复踩坑。
串口使能中断相关代码:
nvic_irq_enable(USART0_IRQn,0,1);
usart_interrupt_enable(USART0, USART_INT_RBNE); /* 使能USART0读区非空中断 */
usart_interrupt_enable(USART0, USART_INT_IDLE); /* 使能USART0空闲中断 */
串口中断处理函数:
void USART0_IRQHandler(void)
{
if ((RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_RBNE)) &&
(RESET != usart_flag_get(USART0, USART_FLAG_RBNE))) {
unsigned char value = usart_data_receive(USART0);
RingBufWrite(g_debugRingBuf, value); //将接收到的数据写入ringbuf中
usart_interrupt_flag_clear(USART0, USART_INT_FLAG_RBNE); //清中断标志
}
else if (RESET != usart_interrupt_flag_get(USART0, USART_INT_FLAG_IDLE)) {
usart_interrupt_flag_clear(USART0, USART_INT_FLAG_IDLE);
usart_data_receive(USART0); /* 清除接收完成标志位 */
(void)LOS_EventWrite(&g_shellInputEvent, 0x1); //事件通知接收完成
}
}
特别要注意的是:与STM32F4不同的是,在进入闲时中断后,需要调用usart_data_receive
函数,用于清除接收完成标志位,否则闲时中断会存在被触发多次或不触发的情况。
在STM32f4xx中
,清除闲时中断标志宏定义如下:
/** @brief Clears the UART IDLE pending flag. * @param __HANDLE__ specifies the UART Handle. * UART Handle selects the USARTx or UARTy peripheral * (USART,UART availability and x,y values depending on device). * @retval None */
#define __HAL_UART_CLEAR_IDLEFLAG(__HANDLE__) __HAL_UART_CLEAR_PEFLAG(__HANDLE__)
/** @brief Clears the UART PE pending flag. * @param __HANDLE__ specifies the UART Handle. * UART Handle selects the USARTx or UARTy peripheral * (USART,UART availability and x,y values depending on device). * @retval None */
#define __HAL_UART_CLEAR_PEFLAG(__HANDLE__) \ do{
\ __IO uint32_t tmpreg = 0x00U; \ tmpreg = (__HANDLE__)->Instance->SR; \ tmpreg = (__HANDLE__)->Instance->DR; \ UNUSED(tmpreg); \ } while(0U)
可以看到有读取操作对DR寄存器进行读取操作,相当于GD32标准库中usart_data_receive
函数的作用。
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