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看了这个BRKDT的说明但是对这个的具体作用不是很明白。麻烦TI的工作人员给解释一下。谢谢。
Jason Wu4：
具体哪一块没弄明白，是中断触发条件还是其他？请具体说明
看了这个BRKDT的说明但是对这个的具体作用不是很明白。麻烦TI的工作人员给解释一下。谢谢。
JLDN：
回复 Jason Wu4:
你好！在HV_SOLAR_DC_AC_v1.1在这个示例里的SciCommsGui.c有程序用到BRKTD.如下所示：
void GetDataByte(void) // Task 5{ if (SciaRegs.SCIRXST.bit.RXRDY == 1) // check if a char has been received { RxChar = SciaRegs.SCIRXBUF.all; RcvTaskPointer = &EchoDataByte; // point to next state //RcvTskPtrShdw = 6; // DEBUG EchoDataByte(); }else if (SciaRegs.SCIRXST.bit.BRKDT == 1 )//|| SerialCommsTimer > 2500) //~2 s timeout { // If break detected or serialport times out, reset SCI //— Needed by some serialports when code is run with an emulator 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.all =0x0000; SciaRegs.SCICTL1.all =0x0027; // Relinquish SCI from Reset
asm(" RPT#8 || NOP"); //—
SendTaskPtr = 0; // Init to 1st state SerialCommsTimer = 0; CommsOKflg = 0; RcvTaskPointer = &GetCmdByte; // go back and wait for new CMD } else if (SerialCommsTimer > 500) // 1000*1mS = 1 sec timeout { CommsOKflg = 0; RcvTaskPointer = &GetCmdByte; // Abort, go back wait for new CMD SerialCommsTimer = 0; } }
void EchoDataByte(void) // Task 6{ if(SciaRegs.SCICTL2.bit.TXRDY == 1) // is TXBUF empty ?, i.e. TXRDY = 1 { SciaRegs.SCITXBUF=RxChar; // if yes, echo back the received char RcvTaskPointer = &PackWord; if(CmdPacket[0] == 7) RcvTaskPointer = &PackLong; //RcvTskPtrShdw = 7; // DEBUG }}void PackLong(void) // expects LSB first then MSB // Task 7 预计LSB第一MSB然后{ if(ByteNum>0) { RxLong += RxChar<<((3-ByteNum)*8); ByteNum–; RcvTaskPointer = &GetDataByte; //RcvTskPtrShdw = 5; // DEBUG* GetDataByte(); } else { RxLong += RxChar; ByteNum=3; //CmdPacket[2] = RxWord; // store data in packet RcvTaskPointer = &CmdInterpreter; //RcvTskPtrShdw = 8; // DEBUG TaskDoneFlag = 0; // indicate new task underway 表明新的任务正在进行中 }}
在这里的BRKTD是表示当通讯异常时如帧错误时复位SCI？还是其他什么作用。我就是想了解一下这个BRKTD的应用场合。谢谢！
