mainc.c

16位计数器的计数程序

//-------------------------------------------------------------------
// Include Files
//-------------------------------------------------------------------
#include <m8c.h>        // part specific constants and macros
#include "PSoCAPI.h"    // PSoC API definitions for all User Modules


//-------------------------------------------------------------------
// C Interrupt Handlers
//-------------------------------------------------------------------
#pragma interrupt_handler Counter16_ISR_C

//-------------------------------------------------------------------
//  Global Symbols
//-------------------------------------------------------------------
extern BYTE bElapsedCount;

//-------------------------------------------------------------------
// Variable Allocation
//-------------------------------------------------------------------
BYTE bElapsedCount;

//-----------------------------------------------------------------------------
//  FUNCTION NAME: Mainc
//
//  DESCRIPTION:
//      Main function. Performs system initialization and loops infinitely.
//      
//-----------------------------------------------------------------------------
//
//  ARGUMENTS:        None
//  RETURNS:          Nothing.
//  SIDE EFFECTS:     None.
//
//  THEORY of OPERATION or PROCEDURE:
//    1) Enable Interrupts of user modules and Global Interrupt
//    2) Start the user modules
//    3) Loop Infinitely
//
void mainc()
{
    //Initialise port2 to 0x00
    PRT2DR=0x00;                    

    //Enable the global Interrupt        
    M8C_EnableGInt;                    
    
    //Enable the Coutner Interrupt
    Counter16_EnableInt();            
    
    //Start the Counter    
    Counter16_Start();                    

    //Infinite loop.  Processing done only at Counter16 ISR
    while(1);                    
}

//-----------------------------------------------------------------------------
//  FUNCTION NAME: Counter16_ISR_C
//
//  DESCRIPTION:
//      Interrupt Service routine of Counter16 usermodule written in C.
//      The _Counter16_ISR subroutine In the Counter16int.asm file, 
//      redirects the flow to this subroutine.
//-----------------------------------------------------------------------------
//
//  ARGUMENTS:        None
//  RETURNS:          Nothing.
//  SIDE EFFECTS:     None.
//
//  THEORY of OPERATION or PROCEDURE:
//        This ISR is serviced on every Termincal count (ie., normally after of every 
//        one second, if the input switch at P1[4] is not pressed)
//        A counter is incremented and output to PORT-2.
//        When the counter reaches 0x10 (ie.,16), it is reset to 0
//
void Counter16_ISR_C()
{
    //increment the variable
    bElapsedCount++;
    
    //if bElapsedCount is greater than or equal to 0x10 (ie.,16)
    if (bElapsedCount >= 0x10 )  { 
        //reset the variable to 0  
        bElapsedCount=0x00;
    }
   
    //output to Port2.  
    PRT2DR=bElapsedCount;
}