MSP430FR4133串口通信问题

void CLOCK_Config() { P4SEL0 |= BIT1 + BIT2; // Select pin4.1 pin4.2 as crystal function do { CSCTL7 &= ~(XT1OFFG + DCOFFG); // Clear XT1 and DCO fault flag 清除 XT1 DCO 失效标志 SFRIFG1 &= ~OFIFG; }while (SFRIFG1 & OFIFG); // Test oscillator fault flag 如果失效标志存在 CSCTL4 = SELA__XT1CLK; // IMPORTANT. Select ACLK = XT1 = 32768Hz } void eUSCIA0_Config() { UART_PORT_SEL |= UART_BIT_TXD + UART_BIT_RXD; // set pin as UART function UCA0CTLW0 |= UCSWRST; // Put eUSCI in reset UCA0CTLW0 |= UCSSEL__SMCLK; // 8-e-1 LSB SMCLK UCA0BR0 = 6; // 9600 baud UCA0BR1 = 0; UCA0MCTLW = 0x2200 + UCOS16 + UCBRF_13; // 1.04MHz/9600 UCA0CTLW0 &= ~UCSWRST; // Initialize eUSCI UCA0IE |= UCRXIE; //开接收中断 //UCA0IE &= ~UCTXIE; //关闭发送中断 } uint8_t Uart_SendFrame(uint8_t *pPtr, uint8_t ui8Length) { if(UCA0IE & UCTXIE) return 0; // Last frame hasn't been sent out if(ui8Length > TXBUF_SIZE) return 0; // Length overflow the buffer ui8TX_counter = 0; // Clear transfer counter UCA0TXBUF = pPtr[ui8TX_counter++]; ui8TX_number = ui8Length; // Number of bytes to be sent UCA0IE |= UCTXIE; // Enable transfer interrupt return 1; // Send successfully } void Spi_uart2_rx_deal(uint8_t *rx_pbuf,uint8_t *tx_pbuf) { ……… Uart_SendFrame(ui8TX_buffer,Buffcn); } #pragma vector=USCI_A0_VECTOR __interrupt void USCI_A0_ISR(void) { switch(__even_in_range(UCA0IV,USCI_UART_UCTXCPTIFG)) { case USCI_NONE: break; case USCI_UART_UCRXIFG: { //接收数据 ui8RX_buffer[ui8RX_counter]= UCA0RXBUF; …….. if(uart2_crc_flag) { uart2_crc_flag=false; if((CRC16_verify(ui8RX_buffer, ui8RX_counter+1))==1) { //UCA0IE&=~UCRXIE;//关闭接收中断 bRX_finished = true;//允许发送 }else ui8RX_counter=0; } } break; case USCI_UART_UCTXIFG: UCA0TXBUF = ui8TX_buffer[ui8TX_counter++]; if(ui8TX_counter>=ui8TX_number) { UCA0IE &= ~UCTXIE; //关闭发送中断 //UCA0IE |= UCRXIE; //开接收中断 ui8RX_counter=0; } break; case USCI_UART_UCSTTIFG: break; case USCI_UART_UCTXCPTIFG: break; } } void main(void) { WM_Initialize(); // System initialize #ifdef Comm_RS485 HAL_RS485_INIT(); #endif …… while(1) { __bis_SR_register(LPM3_bits + GIE); // 进入 LPM3 w/ interrupt WDTCTL = WDTPW + WDTCNTCL + WDTSSEL0 + WDTIS1; // clear watchdog 4m16s if(bWorking_flag) { ….. } #ifdef Comm_RS485 if(bRX_finished) { // rs485 Spi_uart2_rx_deal(ui8RX_buffer,ui8TX_buffer); bRX_finished = false; } #endif } }