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TMS320F280025C: 串口热插拔后无法进入RX中断

Part Number: TMS320F280025C

我在开发板上使用USB转串口模块将PC(windows)设备与TMS320F280025C连接进行串口通信。当串口正常连接后,PC和单片机能够正常通信。但是如果我将串口拔出后再重新插回,单片机就会无法进入RX中断,导致收不到数据,但是PC是仍然能够收到单片机的TX发送出的数据的。如果想要恢复通信,只能将单片机复位重启。

根据上面的情况,我还测试了:先断开PC和单片机的串口连接,当单片机启动后再重新连接串口,此时也会出现同样的情况,即单片机无法进入RX中断。

我的串口初始化和中断代码如下:

//RX中断函数
interrupt void Rx1Isr(void)     // SCI-A
{
    UCHAR data = SciaRegs.SCIRXBUF.all; //要对ALL寄存器读一次  SCIFFRX 为21~24可选1~4字节触发RXINT
    int processBytes = CProtocol_AddToStream(&g_proUart1, data & 0xFF);


    SciaRegs.SCIFFRX.bit.RXFFOVRCLR=1;          // Clear Overflow flag
    PieCtrlRegs.PIEACK.bit.ACK9 = 1;
    SciaRegs.SCIFFRX.bit.RXFFINTCLR = 1; // clear Receive interrupt flag

}

void InitUart1Gpio() //SEARCH "GPIO Muxed Pins",GPIO16(TX),17(RX)复用表格序各为6,
{
    EALLOW; //6=0110b, 01为高两位,为GMUX值,10为低两位,为MUX值

    GpioCtrlRegs.GPAGMUX2.bit.GPIO16 = 0x01;
    GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 0x02; //16=TX

    GpioCtrlRegs.GPAGMUX2.bit.GPIO17 = 0x01;
    GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 0x02; //17=RX


/*
    GpioCtrlRegs.GPAGMUX2.bit.GPIO29 = 0;
    GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 1; //29=TX

    GpioCtrlRegs.GPAGMUX2.bit.GPIO28 = 0;
    GpioCtrlRegs.GPAMUX2.bit.GPIO28 = 1; //=RX

    EDIS;
    */
}

void InitUart1(struct SCI_REGS *UART, u32 LSPCLK, u32 baud) //volatile struct
{
    InitUart1Gpio();

    SciaRegs.SCICTL1.all =0x0023;

    UART->SCICTL1.bit.SWRESET =0;
    UART->SCICTL1.bit.RXENA = 1;//Enable receiver
    UART->SCICTL1.bit.TXENA = 1;//Enable transmitter


    UART->SCIHBAUD.bit.BAUD = 0;
    UART->SCILBAUD.bit.BAUD = LSPCLK/baud/8 - 1;

    UART->SCICCR.all = 7; 
    /* 8N1,8b data,1b stop,no parity
    UART->SCICCR.bit.SCICHAR = 7;   // 8-bit
    UART->SCICCR.bit.PARITY = 0;    //0=ODD 1=EVEN
    UART->SCICCR.bit.PARITYENA = 0; //0=disabled
    UART->SCICCR.bit.STOPBITS = 0;  //One stop bit
    UART->SCICCR.bit.LOOPBKENA = 0; */

    UART->SCICTL2.bit.RXBKINTENA =0;
    UART->SCICTL2.bit.TXINTENA =0;

    /*
    SciaRegs.SCIFFTX.bit.TXFIFORESET = 0;
    SciaRegs.SCIFFTX.bit.SCIRST = 1;
    SciaRegs.SCIFFTX.bit.TXFFIENA=1;
    SciaRegs.SCIFFTX.bit.SCIFFENA=1;
    SciaRegs.SCIFFTX.bit.TXFFIL = 1; //高吞吐量可以用4, 往同一地址一次写4个Byte,如下: for(i) SciaRegs.SCITXBUF=data[i];
     */
    // 中断方式
    SciaRegs.SCIFFTX.all = 0xC021;
    SciaRegs.SCIFFRX.all= 0x0021; //21是1字节触发RXINT,22,23,24为2,3,4字节触发接收中断,高吞吐量时选择4
    SciaRegs.SCIFFCT.all=0x00;

    /*
    //POLL方式, 关闭了TXFFIENA 和 RXFFIENA
    SciaRegs.SCIFFTX.all = 0xC001;
    SciaRegs.SCIFFRX.all= 0x0001; //21是1字节触发RXINT,22,23,24为2,3,4字节触发接收中断,高吞吐量时选择4
    SciaRegs.SCIFFCT.all=0x00;
    */

    UART->SCICTL1.bit.SWRESET = 1;      //active
    SciaRegs.SCIFFRX.bit.RXFIFORESET=1; //active rx


    //memset(rx1, 0, MAX_PACK_LEN);
    memset(tx1_buf, 0, MAX_SEND_LEN);

    //rx1_cnt = 0;
    tx1_len = tx1_cnt = 0;

}

我尝试了对SciaRegs寄存器的值进行检查发现,当能够正常进行串口通信的时候,SciaRegs.SCIRXST.all的值为2,当PC与单片机断开连接后这个值会变为176,恢复PC与单片机的连接后这个值又会变为178,由此我猜测可能是RX出现了错误但是没有复位导致的无法进入中断,但是我应该怎么做让RX能够支持串口热插拔呢?