原创 DSP2812串口FIFO设置及"手动触发"发送中断服务之C++程序

    SciaRegs.SCICCR.all = 0x0007;   // 1 stop bit,  No loopback
                                  // No parity,8 char bits,
                                  // async mode, idle-line protocol
    SciaRegs.SCICTL1.all = 0x0003;  // enable TX, RX, internal SCICLK,
                                  // Disable RX ERR, SLEEP, TXWAKE
    SciaRegs.SCICTL2.bit.TXINTENA =1;
    SciaRegs.SCICTL2.bit.RXBKINTENA =1;
    SciaRegs.SCIHBAUD = 0x0000;
//    SciaRegs.SCILBAUD = SCI_PRD;
    SciaRegs.SCILBAUD = SCI_BAUD(CBR_38400);
#if SCI_FIFO_MODE
//    SciaRegs.SCICCR.bit.LOOPBKENA =1; // Enable loop back
    SciaRegs.SCIFFTX.all=0xE061;
    SciaRegs.SCIFFRX.all=0x2028;
#else   
    SciaRegs.SCIFFTX.all=0xA000;
    SciaRegs.SCIFFRX.all=0x201F;
#endif
    SciaRegs.SCIFFCT.all=0x00;

    SciaRegs.SCICTL1.all =0x0023;     // Relinquish SCI from Reset
#if SCI_FIFO_MODE
 SciaRegs.SCICTL1.bit.SWRESET = 1;
//    SciaRegs.SCIFFTX.bit.TXFIFOXRESET=1;
    SciaRegs.SCIFFRX.bit.RXFIFORESET=1;
    PieCtrlRegs.PIECRTL.bit.ENPIE = 1;   // Enable the PIE block
#endif 
 PieCtrlRegs.PIEIER9.bit.INTx1 = 1;
 PieCtrlRegs.PIEIER9.bit.INTx2 = 1;

 /*设置中断服务程序入口地址*/
 EALLOW; // This is needed to write to EALLOW protected registers
 PieVectTable.TXAINT = &ISRTxUart;
 PieVectTable.RXAINT = &ISRRxUart;
 EDIS;   // This is needed to disable write to EALLOW protected registers

 /*开中断*/
 IER |= M_INT9;
}

2."手动触发"发送中断

void UartObj::putchar(const char dat)
{
char ch;
    ch = dat;
    SendBuffer[SendWritePtr ++] = ch;//写入发送缓冲区（并非FIFO!!!）
    SendWritePtr &= sizeof(SendBuffer) - 1;
    if ((!SendBusy) && (dat == 0x0a))
    {
     SendBusy = true;
#if SCI_FIFO_MODE
     SciaRegs.SCIFFTX.bit.TXFIFOXRESET=1;//.手动触发"发送中断

#else
  SciaRegs.SCITXBUF = SendBuffer[SendReadPtr ++];
  SendReadPtr &= sizeof(SendBuffer) - 1;
#endif  
    }
}

3.收发中断服务程序

interrupt void ISRTxUart(void)
{
#if SCI_FIFO_MODE//串口为FIFO中断模式
 for (int i = 14 - SciaRegs.SCIFFTX.bit.TXFFST; (i > 0) && (Uart.SendWritePtr != Uart.SendReadPtr); i --)
 {//最多发送14个字符,16个容易丢字符
  SciaRegs.SCITXBUF = Uart.SendBuffer[Uart.SendReadPtr ++];
  Uart.SendReadPtr &= sizeof(Uart.SendBuffer) - 1;
 }
 Uart.SendBusy = Uart.SendWritePtr != Uart.SendReadPtr;//判断缓冲区空

//注意下句是成功的关键!!!
 SciaRegs.SCIFFTX.bit.TXFIFOXRESET = Uart.SendBusy//缓冲区非空
                                  || SciaRegs.SCIFFTX.bit.TXFFST;//FIFO非空
 SciaRegs.SCIFFTX.bit.TXINTCLR = 1;
#else//串口为一般中断模式
 if (Uart.SendWritePtr != Uart.SendReadPtr)//缓冲区非空允许发送
 {
  SciaRegs.SCITXBUF = Uart.SendBuffer[Uart.SendReadPtr ++];
  Uart.SendReadPtr &= sizeof(Uart.SendBuffer) - 1;
 }
 Uart.SendBusy = Uart.SendWritePtr != Uart.SendReadPtr;//判断缓冲区空
#endif 
 PieCtrlRegs.PIEACK.bit.ACK9 = 1;
}

interrupt void ISRRxUart(void)
{
#if SCI_FIFO_MODE//串口为FIFO中断模式
 for (int i = SciaRegs.SCIFFRX.bit.RXFIFST; i > 0; i --)
 {
  Uart.ReceiveBuffer[Uart.ReceiveWritePtr ++] = SciaRegs.SCIRXBUF.all;
  Uart.ReceiveWritePtr &= sizeof(Uart.ReceiveBuffer) - 1;
 }
 SciaRegs.SCIFFRX.bit.RXFFOVRCLR = 1;
 SciaRegs.SCIFFRX.bit.RXFFINTCLR = 1;
#else//串口为一般中断模式
 Uart.ReceiveBuffer[Uart.ReceiveWritePtr ++] = SciaRegs.SCIRXBUF.all;
 Uart.ReceiveWritePtr &= sizeof(Uart.ReceiveBuffer) - 1;
#endif 
 PieCtrlRegs.PIEACK.bit.ACK9 = 1;
}

interrupt void ISRADC(void)
{
   Adc.Result[0] = AdcRegs.ADCRESULT0 >>4;
   Adc.Result[1] = AdcRegs.ADCRESULT1 >>4;

   // Reinitialize for next ADC sequence
   AdcRegs.ADCTRL2.bit.RST_SEQ1 = 1;         // Reset SEQ1
   AdcRegs.ADCST.bit.INT_SEQ1_CLR = 1;       // Clear INT SEQ1 bit
   PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;   // Acknowledge interrupt to PIE
}

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