帮忙看看 (AT-START-F421 V1.1)：
Artery AT32 MCU Pack_20201130\BSP\AT32F4xx_StdPeriph_Lib_V1.2.8\Project\AT_START_F421\Examples\USART\Interrupt\
问题：
1.PC发送数据，it.c中，检测不到接收标志
2.USART_ClearITPendingBit() 函数不起作用，操作寄存器才行
- uint32_t status_uart1;
- void USART1_IRQHandler(void)
- {
- // if(USART_GetITStatus(USART1, USART_INT_RDNE) != RESET)
- // { USART_ClearITPendingBit(USART1,USART_INT_RDNE);
- // }
- //
- // if(USART_GetITStatus(USART1, USART_INT_TDE) != RESET)
- // { USART_ClearITPendingBit(USART1,USART_INT_TRAC);
- // }
- status_uart1 = USART1->STS;
- if(status_uart1 & 0x00000060) //TRAC
- {
- USART_ClearITPendingBit(USART1,USART_INT_TRAC);
- status_uart1 = USART1->STS;
- USART1->STS &= ~0x00000060;
- status_uart1 = USART1->STS;
- }
- else if(status_uart1 & 0x00000020) //RDNE
- {
- USART_ClearITPendingBit(USART1,USART_INT_RDNE);
- status_uart1 = USART1->STS;
- USART1->STS &= ~0x00000020;
- status_uart1 = USART1->STS;
- }
- status_uart1 = USART1->STS;
- USART_ClearITPendingBit(USART1,USART_INT_RDNE);
- status_uart1 = USART1->STS;
- USART_ClearITPendingBit(USART1,USART_INT_TRAC);
- status_uart1 = USART1->STS;
- }
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