十年專注單片機方案開發(fā)的方案公司英銳恩，分享CCSC rs232.c程序操作MCD2demo ADC CH0測量電壓通過rs232到PC。英銳恩現(xiàn)提供服務(wù)產(chǎn)品涉及主控芯片：8位單片機、16位單片機、32位單片機及各類運算放大器等。

*=============================================================================
PIC RS232收到'S'or's',返回"S:StartADC",開始測量CH0電壓，并且將數(shù)據(jù)通過RS232送出;
         收到'Q'or'q',返回"Q:EndADC",停止量測CH0電壓.
============================================================================*/
///////////////////////////////////////////////////////////////////////////////
// MPLAB IDE V7.11 + CCS C3.18
// Use 16F877A ADC and Rs232 for MCD2-demo
//
// by LW7807@163.com
// 2005/06/23
///////////////////////////////////////////////////////////////////////////////
#include <16F877A.h>                                    // PIC16F877 header file
#pragma device ADC=10                                   // 10 bits ADC
#pragma use delay(clock=4000000)                        // for 4Mhz crystal
#pragma fuses XT, NOWDT, NOPROTECT, NOLVP               // for debug mode

#pragma use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, stream=MYPC)   
                                                        // rs232 setting

#define DO_NOTHING              0
#define DO_START_ADC            1                       
#define DO_END_ADC              2

/*===========================================================================*/
void main(void)
{
        int16 int_volt;
        int8  str_volt[21];
        float flt_volt;

   int8  do_what = DO_NOTHING;
        int8  tmp;

        while(1){
                // if rs232 get char
                if(0 != kbhit())
                        {
                        tmp = fgetc(MYPC);
                        switch(tmp)
                                {
                                case 'S':
                                case 's':
                                        printf( "S:StartADC\n" );
                                        do_what = DO_START_ADC;
        
                                        // init pic16f877a adc
                                        setup_adc_ports(RA0_RA1_RA3_ANALOG);
                                        setup_adc(ADC_CLOCK_INTERNAL);
                                        set_adc_channel(0);
                                        break;  

 case 'Q':
                                case 'q':
                                        printf( "Q:EndADC\n" );
                                        do_what = DO_END_ADC;
                                        
                                        // adc off
                                        setup_adc(ADC_OFF);
                                        break;
                                default :       // rs232 get other char
                                        putc(tmp);
                                        break;
                                }//end switch(tmp)
                        }//end if(kbhit())

                switch(do_what)
                        {
                        case DO_START_ADC:
                                // start adc and send result to PC
                                int_volt = read_adc();
                                flt_volt = 5.0 * int_volt / 0x3ff;

 sprintf(str_volt, "ADC_CH0:%1.3fV\n", flt_volt);
                                printf(str_volt);
                                printf( "delay_ms(300)\n" );
                                delay_ms(300);
                                break;  
                        case DO_END_ADC:
                                // you want to do
                                break;
                        case DO_NOTHING:
                                // you want to do
                                break;  
                        default:
                                break;
                        }//end switch(do_what)

                }//end while(1)
}//end main()

附上RS232.c程序lst文件

CCS PCM C Compiler, Version 3.187, 16465

               Filename: D:\myPIC\ccsc_rs232.LST

               ROM used: 1091 (13%)
                         Largest free fragment is 2048
               RAM used: 39 (22%) at main() level
                         55 (31%) worst case
               Stack:    2 locations

*
0000:  MOVLW  00

0001:  MOVWF  0A
0002:  GOTO   34B
0003:  NOP
....................  /*=============================================================================
.................... PIC RS232收到'S'or's',返回"S:StartADC",開始測量CH0電壓，并且將數(shù)據(jù)通過RS232送出;
....................          收到'Q'or'q',返回"Q:EndADC",停止量測CH0電壓.
.................... ============================================================================*/
.................... ///////////////////////////////////////////////////////////////////////////////
.................... // MPLAB IDE V7.11 + CCS C3.18
.................... // Use 16F877A ADC and Rs232 for MCD2-demo
.................... //
.................... // by LW7807@163.com
.................... // 2005/06/23
.................... 

///////////////////////////////////////////////////////////////////////////////
.................... #include <16F877A.h>                                    // PIC16F877 header file
....................  //////// Standard Header file for the PIC16F877A device ////////////////
.................... #device PIC16F877A
.................... #list
....................
.................... #pragma device ADC=10                                   // 10 bits ADC
.................... #pragma use delay(clock=4000000)                        // for 4Mhz crystal

0334:  MOVLW  3F
0335:  MOVWF  04
0336:  MOVF   00,W
0337:  BTFSC  03.2
0338:  GOTO   348
0339:  MOVLW  01
033A:  MOVWF  78
033B:  CLRF   77
033C:  DECFSZ 77,F
033D:  GOTO   33C
033E:  DECFSZ 78,F
033F:  GOTO   33B

0340:  MOVLW  4A
0341:  MOVWF  77
0342:  DECFSZ 77,F
0343:  GOTO   342
0344:  NOP
0345:  NOP
0346:  DECFSZ 00,F
0347:  GOTO   339
0348:  BCF    0A.3
0349:  BCF    0A.4
034A:  GOTO   43B (RETURN)
.................... #pragma fuses XT, NOWDT, NOPROTECT, NOLVP               // for debug mode
....................

.................... #pragma use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, stream=MYPC)
....................                                                         // rs232 setting
....................
.................... #define DO_NOTHING              0
.................... #define DO_START_ADC            1
.................... #define DO_END_ADC              2
....................
....................
.................... /*===========================================================================*/
.................... void main(void)
.................... {

034B:  CLRF   04
034C:  MOVLW  1F
034D:  ANDWF  03,F
034E:  MOVLW  06
034F:  BSF    03.5
0350:  MOVWF  1F
0351:  MOVLW  07
0352:  BCF    03.5
0353:  MOVWF  1F
0354:  MOVLW  19
0355:  BSF    03.5
0356:  MOVWF  19
0357:  MOVLW  26
0358:  MOVWF  18
0359:  MOVLW  90

035A:  BCF    03.5
035B:  MOVWF  18
....................         int16 int_volt;
....................         int8  str_volt[21];
....................         float flt_volt;
....................         int8  do_what = DO_NOTHING;
*
035D:  CLRF   3C
....................         int8  tmp;
....................
....................         while(1){
....................                 // if rs232 get char
....................                 if(0 != kbhit())
....................                         {
035E:  MOVLW  00
035F:  BTFSC  0C.5
0360:  MOVLW  01
0361:  XORLW  00
0362:  BTFSC  03.2
0363:  GOTO   3B1

....................                         tmp = fgetc(MYPC);
0364:  BTFSS  0C.5
0365:  GOTO   364
0366:  MOVF   1A,W
0367:  MOVWF  3D
....................                         switch(tmp)
....................                                 {
0368:  MOVF   3D,W
0369:  MOVWF  77
036A:  MOVLW  53
036B:  SUBWF  77,W
036C:  BTFSC  03.2
036D:  GOTO   37B
036E:  MOVLW  73
036F:  SUBWF  77,W
0370:  BTFSC  03.2
0371:  GOTO   37B
0372:  MOVLW  51
0373:  SUBWF  77,W
0374:  BTFSC  03.2
0375:  GOTO   399
0376:  MOVLW  71

0377:  SUBWF  77,W
0378:  BTFSC  03.2
0379:  GOTO   399
037A:  GOTO   3AC
....................                                 case 'S':
....................                                 case 's':
....................                                         printf( "S:StartADC\n" );
037B:  CLRF   3E
037C:  MOVF   3E,W
037D:  CALL   004

037E:  INCF   3E,F
037F:  MOVWF  77
0380:  MOVF   77,W
0381:  BTFSS  0C.4
0382:  GOTO   381
0383:  MOVWF  19
0384:  MOVLW  0B
0385:  SUBWF  3E,W
0386:  BTFSS  03.2
0387:  GOTO   37C
....................                                         do_what = DO_START_ADC;
0388:  MOVLW  01
0389:  MOVWF  3C
....................
....................                                         // init pic16f877a adc
....................                                         setup_adc_ports(RA0_RA1_RA3_ANALOG);
038A:  MOVLW  84
038B:  BSF    03.5
038C:  MOVWF  1F

....................                                         setup_adc(ADC_CLOCK_INTERNAL);
038D:  BCF    03.5
038E:  MOVF   1F,W
038F:  ANDLW  38
0390:  IORLW  C1
0391:  MOVWF  1F
....................                                         set_adc_channel(0);
0392:  MOVLW  00
0393:  MOVWF  78
0394:  MOVF   1F,W
0395:  ANDLW  C7
0396:  IORWF  78,W
0397:  MOVWF  1F

....................                                         break;
0398:  GOTO   3B1
....................                                 case 'Q':
....................                                 case 'q':
....................                                         printf( "Q:EndADC\n" );
0399:  CLRF   3E
039A:  MOVF   3E,W
039B:  CALL   014
039C:  INCF   3E,F
039D:  MOVWF  77
039E:  MOVF   77,W
039F:  BTFSS  0C.4
03A0:  GOTO   39F
03A1:  MOVWF  19
03A2:  MOVLW  09
03A3:  SUBWF  3E,W
03A4:  BTFSS  03.2
03A5:  GOTO   39A
....................                                         do_what = DO_END_ADC;

03A6:  MOVLW  02
03A7:  MOVWF  3C
....................
....................                                         // adc off
....................                                         setup_adc(ADC_OFF);
03A8:  MOVF   1F,W
03A9:  ANDLW  38
03AA:  MOVWF  1F
....................                                         break;
03AB:  GOTO   3B1
....................                                 default :       // rs232 get other char
....................                                         putc(tmp);
03AC:  MOVF   3D,W
03AD:  BTFSS  0C.4
03AE:  GOTO   3AD
03AF:  MOVWF  19
....................                                         break;
03B0:  GOTO   3B1
....................                                 }//end switch(tmp)
....................                         }//end if(kbhit())
....................
....................                 switch(do_what)

....................                         {
03B1:  MOVF   3C,W
03B2:  MOVWF  77
03B3:  MOVLW  01
03B4:  SUBWF  77,W
03B5:  BTFSC  03.2
03B6:  GOTO   3BF
03B7:  MOVLW  02
03B8:  SUBWF  77,W
03B9:  BTFSC  03.2
03BA:  GOTO   43E
03BB:  MOVF   77,F
03BC:  BTFSC  03.2
03BD:  GOTO   43F
03BE:  GOTO   440
....................                         case DO_START_ADC:
....................                                 // start adc and send result to PC
....................                                 int_volt = read_adc();                  flt_volt = 5.0 * int_volt / 0x3ff;

03C8:  MOVF   22,W
03C9:  MOVWF  3F
03CA:  MOVF   21,W
03CB:  MOVWF  3E
03CC:  GOTO   049
03CD:  CLRF   41
03CE:  CLRF   40
03CF:  MOVLW  20
03D0:  MOVWF  3F
03D1:  MOVLW  81
03D2:  MOVWF  3E
03D3:  MOVF   7A,W
03D4:  MOVWF  45
03D5:  MOVF   79,W
03D6:  MOVWF  44

03D7:  MOVF   78,W
03D8:  MOVWF  43
03D9:  MOVF   77,W
03DA:  MOVWF  42
03DB:  GOTO   069
03DC:  MOVF   77,W
03DD:  MOVWF  3E
03DE:  MOVF   78,W
03DF:  MOVWF  3F
03E0:  MOVF   79,W
03E1:  MOVWF  40
03E2:  MOVF   7A,W
03E3:  MOVWF  41
03E4:  MOVWF  45
03E5:  MOVF   79,W
03E6:  MOVWF  44
03E7:  MOVF   78,W
03E8:  MOVWF  43
03E9:  MOVF   77,W
03EA:  MOVWF  42
03EB:  CLRF   49
03EC:  MOVLW  C0
03ED:  MOVWF  48
03EE:  MOVLW  7F
03EF:  MOVWF  47

03F0:  MOVLW  88
03F1:  MOVWF  46
03F2:  GOTO   0E2
03F3:  MOVF   7A,W
03F4:  MOVWF  3B
03F5:  MOVF   79,W
03F6:  MOVWF  3A
03F7:  MOVF   78,W
03F8:  MOVWF  39
03F9:  MOVF   77,W
03FA:  MOVWF  38
....................                                 sprintf(str_volt, "ADC_CH0:%1.3fV\n", flt_volt);
*
035C:  CLRF   20
*
03FB:  MOVLW  23
03FC:  MOVWF  20
03FD:  CLRF   3E

03FE:  MOVF   3E,W
03FF:  CALL   022                       delay_ms(300);

0436:  MOVLW  02
0437:  MOVWF  3E
0438:  MOVLW  96
0439:  MOVWF  3F
043A:  GOTO   334
043B:  DECFSZ 3E,F
043C:  GOTO   438
....................                                 break;

043D:  GOTO   441
....................                         case DO_END_ADC:
....................                                 // you want to do
....................                                 break;
043E:  GOTO   441
....................                         case DO_NOTHING:
....................                                 // you want to do
....................                                 break;
043F:  GOTO   441
....................                         default:
....................                                 break;
0440:  GOTO   441
....................                         }//end switch(do_what)
....................
....................                 }//end while(1)
0441:  GOTO   35E
.................... }//end main()
....................
0442:  SLEEP

Configuration Fuses:
   Word  1: 3F79   XT NOWDT NOPUT NODEBUG NOPROTECT BROWNOUT NOLVP NOCPD NOWRT