SerComm.rar_dos 串口

#include <dos.h> #include "SerComm.h" void interrupt(*oldvects[2])(...); void interrupt com1_int(...); void interrupt com2_int(...); class ComClass { public: ComClass(const int comPortVal); void comInt(void); void sendChar(const char ch); int receiveChar(char *ch); void comOff(void); int setCom(const int baud, const int para); void comMainRun(void); private: int comPort; int comBase; int comIRQ; int comVect; int comOldVect; int onFlag; int inHead; int inTail; int outHead; int outTail; char *inBuf; char *outBuf; }; ComClass::ComClass(const int comPortVal) { comPort = comPortVal; onFlag = 0; inHead = 0; inTail = 0; outHead = 0; outTail = 0; switch(comPortVal) { case COM1: comBase = COM1_BASE; comIRQ = COM1_IRQ; comVect = COM1_VECT; comOldVect = COM1_OLD_VECT; break; case COM2: comBase = COM2_BASE; comIRQ = COM2_IRQ; comVect = COM2_VECT; comOldVect = COM2_OLD_VECT; break; default: break; } } void ComClass::comInt(void) { if (!onFlag) return; disable(); int temp = (inportb(comBase+IIR)) & IIR_MASK; switch(temp) { case 0x00: // modem status changed inportb(comBase+MSR); // read in useless char break; case 0x02: // Request To Send char if (outHead != outTail) // there's a char to send { outportb(comBase+TXR, outBuf[outHead++]); // send the character if (outHead == OBUF_LEN) outHead = 0; // if at end of buffer, reset pointer } break; case 0x04: // character ready to be read in inBuf[inHead++] = inportb(comBase+RXR);// read character into inbuffer if (inHead == IBUF_LEN) // if at end of buffer inHead = 0; // reset pointer break; case 0x06: // line status has changed inportb(comBase+LSR); // read in useless char break; default: break; } outportb(PIC8259_ICR, PIC8259_EOI); // Signal end of hardware interrupt enable(); // reenable interrupts at the end of the handler } void ComClass::sendChar(const char ch) { if (onFlag) { disable(); // make sure nothing happens while changing buffer outBuf[outTail++] = ch; // insert character into buffer; if (outTail == OBUF_LEN) // if at end of out buffer { outTail = 0; // reset pointer } enable(); // re-enable interrupts } } int ComClass::receiveChar(char *ch) { if(onFlag) { if (inHead != inTail) // there is a character { disable(); // disable irqs while getting char *ch = inBuf[inTail++]; // get character from buffer if (inTail == IBUF_LEN) //if at end of in buffer inTail = 0; // reset pointer enable(); // re-enable interrupt return TRUE; } } return FALSE; } void ComClass::comOff(void) { if(onFlag) { disable(); int temp = inportb(PIC8259_IMR) | ~comIRQ; outportb(PIC8259_IMR, temp); outportb(comBase + IER, 0); outportb(comBase + MCR, 0); enable(); setvect(comVect, oldvects[comOldVect]); onFlag = FALSE; delete [] inBuf; delete [] outBuf; } } int ComClass::setCom(const int baud, const int para) { if (baud == 0) return FALSE; int divisor = (int)(115200L/baud); //申请空间 inBuf = new char[IBUF_LEN]; outBuf = new char[OBUF_LEN]; disable(); char c = inportb(comBase + LCR); outportb(comBase + LCR, (c | 0x80)); outportb(comBase + DLL, (divisor & 0x00FF)); outportb(comBase + DLH, ((divisor >> 8) & 0x00FF)); outportb(comBase + LCR, c); outportb(comBase + LCR, para); enable(); oldvects[comOldVect] = getvect(comVect); switch(comPort) { case COM1: setvect(comVect, com1_int); break; case COM2: setvect(comVect, com2_int); break; default: break; } disable(); int temp = inportb(comBase + MCR) | 0x0f; outportb(comBase + MCR, temp); temp = (inportb(comBase + IER)) | IER_RX_INT; outportb(comBase + IER, temp); temp = inportb(PIC8259_IMR) & comIRQ; outportb(PIC8259_IMR, temp); enable(); onFlag = TRUE; return TRUE; } void ComClass::comMainRun(void) { if (onFlag) { disable(); if (outHead != outTail) { outportb(comBase+IER,IER_TX_INT); } else { outportb(comBase+IER,IER_RX_INT); } enable(); } } ComClass com1(COM1); ComClass com2(COM2); void interrupt com1_int(...) { com1.comInt(); } void interrupt com2_int(...) { com2.comInt(); } int SerComOn(int comport) { if ((comport == COM1) || (comport == COM2)) return TRUE; else return FALSE; } int SetSerCom(const int comport, int baud, int para) { switch(comport) { case COM1: return com1.setCom(baud, para); case COM2: return com2.setCom(baud, para); default: return FALSE; } } //关闭串口 void SerComOff(const int comport) { switch(comport) { case COM1: com1.comOff(); break; case COM2: com2.comOff(); break; default: break; } } //关闭全部串口 void OffAllSerial(void) { com1.comOff(); com2.comOff(); } void SendChar(const int comport, const char ch) { switch(comport) { case COM1: com1.sendChar(ch); break; case COM2: com2.sendChar(ch); break; default: break; } } void SendChars(const int comport, unsigned int strlen, char *buf, unsigned int *sendlen) { for(int i=0; i<strlen; i++) { SendChar( comport, *(buf+i) ); } *sendlen = strlen; } int ReceiveChar(const int comport, char *ch) { switch(comport) { case COM1: return com1.receiveChar(ch); case COM2: return com2.receiveChar(ch); default: return FALSE; } } //例行扫描 void comMainRun(void) { com1.comMainRun(); com2.comMainRun(); }