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串口采用中断方式发送数据，开启发送中断前 UCTXIFG是置位的，所以当我使能发送中断时会立刻产生中断。
但是当我发送完成后，后面就不产生中断了，UCTXIFG位一直是0，这是怎么回事？
void UART_Transmit_IT(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size) { huart->txbuf = pData; huart->txlen = Size; /* 使能串口发送中断 */ USCI_A_UART_enableInterrupt(huart->baseAddress, USCI_A_UART_TRANSMIT_INTERRUPT ); } void TX_IT_Callback(UART_HandleTypeDef *huart) { if(huart->txlen == 0U) { USCI_A_UART_transmitData(huart->baseAddress,*huart->txbuf); /* Disable the UART Transmit Data Register Empty Interrupt */ USCI_A_UART_disableInterrupt(huart->baseAddress, USCI_A_UART_TRANSMIT_INTERRUPT ); } else { USCI_A_UART_transmitData(huart->baseAddress,*huart->txbuf++); huart->txlen-- ; } }
这个逻辑下进入中断是9次，只能发一次，后面不会再进入中断了。
如果改为这样就正常了，但是我用了一个485芯片，想彻底发送完然后产生中断，此时切换引脚为接收，原因和方法请研究一下
if(huart->txlen == 1U) { USCI_A_UART_transmitData(huart->baseAddress,*huart->txbuf); /* Disable the UART Transmit Data Register Empty Interrupt */ USCI_A_UART_disableInterrupt(huart->baseAddress, USCI_A_UART_TRANSMIT_INTERRUPT ); huart->txlen --; }
