ex_ccp1s.c

TI公司的CCS一些常用的函数库

/////////////////////////////////////////////////////////////////////////
////                           EX_CCP1S.C                            ////
////                                                                 ////
////  This program will show how to use the built in CCP to          ////
////  generate a single pulse of a predefined time in response       ////
////  to a pushbutton (40).                                          ////
////                                                                 ////
////  Configure the CCS prototype card as follows:                   ////
////      Connect a scope to pin 3 (C2)                              ////
////      Connect 40 (button) to 47 (B0)                             ////
////                                                                 ////
////  This example will work with the PCM and PCH compilers.  The    ////
////  following conditional compilation lines are used to include a  ////
////  valid device for each compiler.  Change the device and clock   ////
////  for your hardware if needed.                                   ////
/////////////////////////////////////////////////////////////////////////
////        (C) Copyright 1996,2003 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.              ////
/////////////////////////////////////////////////////////////////////////


#if defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)

#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#endif

void main()
{
   setup_ccp1(CCP_COMPARE_CLR_ON_MATCH);     // Configure CCP1 in COMPARE mode
   setup_timer_1(T1_INTERNAL);               // Set up timer to instruction clk

   while(TRUE)
   {
       while(input(PIN_B0)) ;                // Wait for keypress

       setup_ccp1(CCP_COMPARE_SET_ON_MATCH); // Configure CCP1 to set
       CCP_1=0;                              // C2 high now
       set_timer1(0);

       CCP_1 = 500;                          // Set high time limit
                                             // to 100 us
                                             // limit is time/(clock/4)
                                             // 500 = .0001*(20000000/4)

       setup_ccp1(CCP_COMPARE_CLR_ON_MATCH); // Configure CCP1 in COMPARE
                                             // mode and to pull pin C2
                                             // low on a match with timer1

       delay_ms(1000);                       // Debounce - Permit only one pulse/sec
   }
}