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【求助】求达人解读一串口调试程序
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下面是老师给的一个嵌入式系统中串口调试程序，但是我看不大懂，求高手将程序划分功能模块，并对每个模块中的程序做尽量详细一点的注释,有金币奖励，酌情加赏 #include "serial.h" #include #include //long int test_gnd_status=0; //long int test_rem_status=0; extern void SBC_SetBitInIMR (unsigned char idx); extern void SBC_ClearBitInIMR(unsigned char idx); unsigned char Status; //Define Register ID #define THR 0 //transmit #define RDR 0 //receive #define BAUD_L 0 //baud rate low #define BAUD_H 1 //baud rate high #define IER 1 //Interrupt enable register #define IIR 2 //Interrupt index reg. (read) #define LCR 3 //Line control register(write) #define MCR 4 //Modem control reg. (write) #define LSR 5 //Line status(read) #define MSR 6 //Modem status(read) struct CPARAM { unsigned base; volatile unsigned char Rxhead,Rxtail,RxBuf[256]; volatile unsigned char Txhead,Txtail,TxBuf[256]; } SIO[8]; static int ComSum = 0; //Serial ports total numbers static int ISR_ComSum = 0; //ISR vector numbers static int id[4]; static void _interrupt _far isr_com1(void); static void _interrupt _far isr_com2(void); static void _interrupt _far isr_com3(void); static void _interrupt _far isr_com4(void); // //int Com4_Open( int com, unsigned baud, unsigned char mode ) // //Return: 0=success; -1=fail // int Com_Open(int base, int baud, unsigned char mode, char isr_num) { unsigned char B, LSB, MSB; int com; //--[1]--Set Baud Rate B = _inp(base+LCR); B = B | 0x80; //Set B7 _outp(base+LCR, B ); LSB = baud & 0x00FF; MSB = (baud & 0xFF00) / 256; _outp( base+BAUD_L, LSB ); _outp( base+BAUD_H, MSB ); //--[2]--Set Line Control Register (LCR) B = inp( base+LCR ); B = B & 0x7F; //Clear B7 _outp( base+LCR, B ); _outp( base+LCR, mode ); //--[3]--Set Interrupt Enable Register (IER) if (isr_num<0) { _outp(base+IER, 0x0); //关中断 _outp(base+MCR, 0x0); //不用的MODEM控制寄存器清零 } else { _outp( base+IER, 0x1 ); //Rx Enabled _outp( base+MCR, 0x0B ); //ISR enabled } //--[4]--检查port是否存在 B = _inp(base+LCR); if (B!=mode) com = -1; else { com = ComSum ++; SIO[com].base = base; SIO[com].Txhead = 0; SIO[com].Txtail = 0; SIO[com].Rxhead = 0; SIO[com].Rxtail = 0; if (isr_num>=0) { id[ISR_ComSum] = com; SBC_SetBitInIMR(isr_num); switch (ISR_ComSum) { case 0: if (isr_num<8) _dos_setvect(isr_num+8, isr_com1); else _dos_setvect(isr_num+0x68, isr_com1); break; case 1: if (isr_num<8) _dos_setvect(isr_num+8, isr_com2); else _dos_setvect(isr_num+0x68, isr_com2); break; case 2: if (isr_num<8) _dos_setvect(isr_num+8, isr_com3); else _dos_setvect(isr_num+0x68, isr_com3); break; case 3: if (isr_num<8) _dos_setvect(isr_num+8, isr_com4); else _dos_setvect(isr_num+0x68, isr_com4); break; } SBC_ClearBitInIMR(isr_num); ISR_ComSum ++; } } //printf("ComSum=%d ISR_ComSum=%d com=%d\n", ComSum,ISR_ComSum,com); //printf("SIO[com].base=%x\n", SIO[com].base); return (com); } int Com_IsRxOK(int com) { unsigned char B; if ((com<0) || (com>(ComSum-1))) return(0); B = _inp( SIO[com].base+LSR ); return( B & 0x01 ); } int Com_IsTxOK(int com) { unsigned char B; if ((com<0) || (com>(ComSum-1))) return(0); B = _inp( SIO[com].base+LSR ); Status = B; return ((B&0x20)/0x20); } // //int Com4_LenRx(int com) // //Return: -1=fail; other=success // /*int Com_LenRx(int com) { int len; if ((com<0) || (com>(ComSum-1))) return (0); if ( SIO[com].Rxhead >= SIO[com].Rxtail ) len = SIO[com].Rxhead - SIO[com].Rxtail; else len = 256 + SIO[com].Rxhead - SIO[com].Rxtail; return (len); }*/ BYTE Com_LenRx(int com) { BYTE len; if ((com<0) || (com>(ComSum-1))) return (0); len = SIO[com].Rxhead - SIO[com].Rxtail; return (len); } /*int Com_LenTx(int com) { int len; if ((com<0) || (com>(ComSum-1))) return (0); if ( SIO[com].Txhead >= SIO[com].Txtail ) len = SIO[com].Txhead - SIO[com].Txtail; else len = 256 + SIO[com].Txhead - SIO[com].Txtail; return (len); }*/ BYTE Com_LenTx(int com) { BYTE len; if ((com<0) || (com>(ComSum-1))) return (0); len = SIO[com].Txhead - SIO[com].Txtail; return (len); } int Com_Out(int com, unsigned char *abyte, int nbyte) { int idx, len, num_out; if ((com<0) || (com>(ComSum-1))) return (0); len = Com_LenTx(com); if ((len+nbyte) <= 256) num_out = nbyte; else num_out = 256 - len; for (idx=0; idx if (Com_LenTx(com)) { _outp( SIO[com].base+IER, 0x3 ); //Rx | Tx Enabled for (idx=0;idx<500;idx++); //delay for settle down } return(num_out); } int Com_In(int com, unsigned char *abyte, int nbyte) { int idx, len, num_in; if ((com<0) || (com>(ComSum-1))) return (0); len = Com_LenRx(com); if (len >= nbyte) num_in = nbyte; else num_in = len; for (idx=0; idx return (num_in); } unsigned char Com_GetChar(int com) { if ((com<0) || (com>(ComSum-1))) return (0); return (_inp(SIO[com].base+RDR)); } static void _interrupt _far isr_com1(void) { static unsigned char status; static int com; com = id[0]; status = _inp(SIO[com].base+IIR); //test_gnd_status++; ///////////////////////////////////////////////////////////// // SIO[com].TxBuf[SIO[com].Txtail]=SIO[com].TxBuf[SIO[com].Txhead]; // SIO[com].RxBuf[SIO[com].Rxhead++] = Com_GetChar(com); // _outp(SIO[com].base+IER, 0x1); //[make Tx/Rx disabled] ///////////////////////////////////////////////////////////// do { switch (status & 0x06) { case 4: //[Rx ready] while (Com_IsRxOK(com)) SIO[com].RxBuf[SIO[com].Rxhead++] = Com_GetChar(com); break; case 2: //[Tx ready] while (Com_IsTxOK(com)) { _outp(SIO[com].base, SIO[com].TxBuf[SIO[com].Txtail++]); if (!Com_LenTx(com)) _outp(SIO[com].base+IER, 0x1); //[make Tx disabled] } break; } status = _inp(SIO[com].base+IIR); } while ((status & 0x1)==0); _outp(0x20,0x20); } static void _interrupt _far isr_com2(void) { static unsigned char status; static int com; //test_rem_status++; com = id[1]; status = _inp(SIO[com].base+IIR); do { switch (status & 0x06) { case 4: //[Rx ready] while (Com_IsRxOK(com)) SIO[com].RxBuf[SIO[com].Rxhead++] = Com_GetChar(com); break; case 2: //[Tx ready] while (Com_IsTxOK(com)) { _outp(SIO[com].base, SIO[com].TxBuf[SIO[com].Txtail++]); if (!Com_LenTx(com)) _outp(SIO[com].base+IER, 0x1); //[make Tx disabled] } break; } status = _inp(SIO[com].base+IIR); } while ((status & 0x1)==0); _outp(0x20,0x20); } static void _interrupt _far isr_com3(void) { static unsigned char status; static int com; com = id[2]; status = _inp(SIO[com].base+IIR); do { switch (status & 0x06) { case 4: //[Rx ready] while (Com_IsRxOK(com)) SIO[com].RxBuf[SIO[com].Rxhead++] = Com_GetChar(com); break; case 2: //[Tx ready] while (Com_IsTxOK(com)) { _outp(SIO[com].base, SIO[com].TxBuf[SIO[com].Txtail++]); if (!Com_LenTx(com)) _outp(SIO[com].base+IER, 0x1); //[make Tx disabled] } break; } status = _inp(SIO[com].base+IIR); } while ((status & 0x1)==0); _outp(0x20,0x20); } static void _interrupt _far isr_com4(void) { static unsigned char status; static int com; com = id[3]; status = _inp(SIO[com].base+IIR); do { switch (status & 0x06) { case 4: //[Rx ready] while (Com_IsRxOK(com)) SIO[com].RxBuf[SIO[com].Rxhead++] = Com_GetChar(com); break; case 2: //[Tx ready] while (Com_IsTxOK(com)) { _outp(SIO[com].base, SIO[com].TxBuf[SIO[com].Txtail++]); if (!Com_LenTx(com)) _outp(SIO[com].base+IER, 0x1); //[make Tx disabled] } break; } status = _inp(SIO[com].base+IIR); } while ((status & 0x1)==0); _outp(0x20,0x20); } // //void Com4_NS550(int com, int trigger) // void Com_NS550(int com, int trigger) { if ((com<0) || (com>(ComSum-1))) return; _outp(SIO[com].base+2, trigger+1); } void Com_SetRTS(int com) { unsigned char B; if ((com<0) || (com>(ComSum-1))) return; B = _inp(SIO[com].base+MCR); B = B | 0x02; _outp(SIO[com].base+MCR, B); } void Com_ClearRTS(int com) { unsigned char B; if ((com<0) || (com>(ComSum-1))) return; B = _inp(SIO[com].base+MCR); B = B & 0xFD; _outp(SIO[com].base+MCR, B); } void Com_Refresh(int com) { if ((com<0) || (com>(ComSum-1))) return; while (Com_IsRxOK(com)) SIO[com].RxBuf[SIO[com].Rxhead++] = Com_GetChar(com); } int Com_Out2(int com, unsigned char *abyte, int nbyte) { int idx; if ((com<0) || (com>(ComSum-1))) return (0); for (idx=0; idx while (!Com_IsTxOK(com)); //waiting for Tx Ready _outp( SIO[com].base, *(abyte+idx) ); } return (nbyte); } void Com_PutChar(int com, BYTE Char ) { if ((com<0) || (com>(ComSum-1))) return; _outp(SIO[com].base+THR, Char); } [ Last edited by AH_Shyun on 2010-10-17 at 16:43 ] |
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