PIC CCS C语言程序范例

The CCS C compiler includes a library of example programs for many common applications. Each example program contains a header with instructions on how to run the example, and if necessary, the wiring instructions for interfacing external devices. 

Here are three such example programs included with our compiler, as well as a list file generated by the compiler which shows the assembly generated to correspond with the C code. 

For a full list of example files and source code drivers included with the CCS C compiler go here 

Jump to: Stepper Motor Controller | Seconds Timer | Simple A/D | Example List File | List of Example Files 

Stepper Motor Controller 

/////////////////////////////////////////////////////////////////////////

////                        EX_STEP.C                                ////

////                                                                 ////

////  This program interfaces to a stepper motor.  The program will  ////

////  use the RS-232 interface to either control the motor with a    ////

////  analog input, a switch input or by RS-232 command.             ////

////                                                                 ////

////  Configure the CCS prototype card as follows:                   ////

////     Connect stepper motor to pins 47-50 (B0-B3)                 ////

////     Conenct 40 to 54 (pushbutton)                               ////

////     Connect 9 to 15 (pot)                                       ////

////     See additional connections below.                           ////

/////////////////////////////////////////////////////////////////////////

////        (C) Copyright 1996,2001 Custom Computer Services         ////

//// This source code may only be used by licensed users of the CCS  ////

//// C compiler.  This source code may only be distributed to other  ////

//// licensed users of the CCS C compiler.  No other use,            ////

//// reproduction or distribution is permitted without written       ////

//// permission.  Derivative programs created using this software    ////

//// in object code form are not restricted in any way.              ////

/////////////////////////////////////////////////////////////////////////

#include <16c74.h>

#fuses HS,NOWDT,NOPROTECT

#use delay(clock=20000000)

#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)  // Jumpers: 8 to 11, 7 to 12

#include

#byte port_b = 6

#define FOUR_PHASE TRUE

#ifdef FOUR_PHASE

byte const POSITIONS[4] = {0b0101,

                           0b1001,

                           0b1010,

                           0b0110};

#else

byte const POSITIONS[8] = {0b0101,

                           0b0001,

                           0b1001,

                           0b1000,

                           0b1010,

                           0b0010,

                           0b0110,

                           0b0100};

#endif

drive_stepper(byte speed, char dir, byte steps) {

   static byte stepper_state = 0;

   byte i;

   for(i=0;i     delay_ms(speed);

     set_tris_b(0xf0);

     port_b = POSITIONS[ stepper_state ];

     if(dir!='R')

       stepper_state=(stepper_state+1)&(sizeof(POSITIONS)-1);

     else

       stepper_state=(stepper_state-1)&(sizeof(POSITIONS)-1);

   }

}

use_pot() {

  byte value;

  setup_adc(adc_clock_internal);

  set_adc_channel( 1 );

  printf("rn");

  while( TRUE ) {

    value=read_adc();

    printf("%2Xr",value);

    if(value<0x80)

       drive_stepper(value,'R',8);

    else if(value>0x80)

       drive_stepper(128-(value-128),'F',8);

  }

}

use_switch(byte speed, char dir) {

   byte steps;

   printf("nrSteps per press: ");

   steps = gethex();

   while(true) {

      while(input(PIN_B7)) ;

      drive_stepper(speed,dir,steps);

      while(!input(PIN_B7)) ;

      delay_ms(100);

   }

}

main() {

   byte speed,steps;

   char dir;

   setup_port_a(RA0_RA1_ANALOG);

   while (TRUE) {

       printf("nrSpeed (hex): ");

       speed = gethex();

       if(speed==0)

          use_pot();

       printf("nrDirection (F,R): ");

       dir=getc()|0x20;

       putc(dir);

       printf("nrSteps (hex): ");

       steps = gethex();

       if(steps==0)

          use_switch(speed,dir);

       drive_stepper(speed,dir,steps);

   }

}

Seconds Timer 

///////////////////////////////////////////////////////////////////////

////                          EX_STWT.C                            ////

////                                                               ////

//// This program uses the RTCC (timer0) and interrupts to keep a  ////

//// real time seconds counter.  A simple stop watch function is   ////

//// then implemented.                                             ////

////                                                               ////

//// Configure the CCS prototype card as follows:                  ////

////     Insert jumpers from: 11 to 17 and 12 to 18.               ////

///////////////////////////////////////////////////////////////////////

#include <16C84.H>

#fuses HS,NOWDT,NOPROTECT

#use delay(clock=20000000)

#use rs232(baud=9600, xmit=PIN_A3, rcv=PIN_A2)

#define INTS_PER_SECOND 76     // (20000000/(4*256*256))

byte seconds;      // A running seconds counter

byte int_count;    // Number of interrupts left before a 

   // second has elapsed

#int_rtcc          // This function is called every time

clock_isr() {      // the RTCC (timer0) overflows (255->0).

                   // For this program this is apx 76 times

    if(--int_count==0) {           // per second.

      ++seconds;

      int_count=INTS_PER_SECOND;

    }

}

main() {

   byte start;

   int_count=INTS_PER_SECOND;

   set_rtcc(0);

   setup_counters( RTCC_INTERNAL, RTCC_DIV_256);

   enable_interrupts(RTCC_ZERO);

   enable_interrupts(GLOBAL);

   do {

      printf("Press any key to begin.nr");

      getc();

      start=seconds;

      printf("Press any key to stop.nr");

      getc();

      printf("%u seconds.nr",seconds-start);

   } while (TRUE);

}

Simple A/D 

/////////////////////////////////////////////////////////////////////////

////                          EX_ADMM.C                              ////

////                                                                 ////