counter.cpp

16 relay output channels and 16 isolated digital input channels LED indicators to show activated

/*
 ****************************************************************************************
 * Program        : COUNTER.CPP                                                         *
 * Description    : Demo program for counter function                                   *
 * Boards Supp.   :                                                                     *
 * APIs used      : DRV_DeviceOpen,DRV_DeviceClose, DRV_GetErrorMessage,                *
 *                  DRV_CounterReset, DRV_CounterEventStart, DRV_CounterEventRead       *
 * Revision       : 1.00                                                                *
 * Date           : 7/8/1999                   Advantech Co., Ltd.                      *
 ****************************************************************************************
 */
#include <windows.h>
#include <windef.h>
#include <stdio.h>
#include <conio.h>

#include "..\..\..\..\include\driver.h"

/******************************
 * Local function declaration *
 ******************************/
void ErrorHandler(DWORD dwErrCde);
void ErrorStop(long*, DWORD);

void main()
{
    DWORD  dwErrCde;
    ULONG  lDevNum;
    long   lDriverHandle;

    USHORT wChannel = 0;  
	USHORT wOverflow = 0;         // counter over 32 bit flag
	ULONG  dwReading = 0;   
	PT_CounterEventStart tCounterEventStart;	
    PT_CounterEventRead  tCounterEventRead;

    //Step 1: Display hardware and software settings for running this example
    printf("Before running this example, please\n");
    printf("use the device installation utility to add the device.\n");

    //Step 2: Input parameters
    printf("\nPlease input parameters:");
    printf("\nDevice Number (check the device installation utility): ");
    scanf("%d", &lDevNum);
    printf("\nInput Channel: ");
    scanf("\n%d", &wChannel);

    //Step 3: Open device
    dwErrCde = DRV_DeviceOpen(lDevNum, &lDriverHandle);   
    if (dwErrCde != SUCCESS)
    {
        ErrorHandler(dwErrCde);
        printf("Program terminated!\n");

        printf("Press any key to exit....");
        getch();
        exit(1);
    }

    // Step 4: Reset counter by DRV_CounterReset
	dwErrCde = DRV_CounterReset(lDriverHandle, wChannel);
    if (dwErrCde != SUCCESS)
    {
        ErrorHandler(dwErrCde);
        printf("Program terminated!\n");

        printf("Press any key to exit....");
        getch();
        exit(1);
    }

    // Step 5: Start counter operation by DRV_CounterEventStart
	tCounterEventStart.counter = wChannel;
    dwErrCde = DRV_CounterEventStart(lDriverHandle, &tCounterEventStart);
    if (dwErrCde != SUCCESS)
    {
        ErrorHandler(dwErrCde);
        printf("Program terminated!\n");

        printf("Press any key to exit....");
        getch();
        exit(1);
    }

    // Step 6: Read counter value by DRV_CounterEventRead in while loop
    //         and display counter value, exit when pressing any key
	tCounterEventRead.counter = wChannel;
    tCounterEventRead.overflow = &wOverflow;
    tCounterEventRead.count = &dwReading;

    while( !kbhit() )
    {
       dwErrCde = DRV_CounterEventRead(lDriverHandle, &tCounterEventRead);
       if (dwErrCde != SUCCESS)
       {
          ErrorStop(&lDriverHandle, dwErrCde);
          return;
       }
       printf("\nCounter value = %lu", dwReading);
       Sleep(1000);
    }       

    // Step 7: Stop counter by DRV_CounterReset
	dwErrCde = DRV_CounterReset(lDriverHandle, wChannel);
    if (dwErrCde != SUCCESS)
    {
        ErrorHandler(dwErrCde);
        printf("Program terminated!\n");

        printf("Press any key to exit....");
        getch();
        exit(1);
    }

    // Step 8: Close device
    dwErrCde = DRV_DeviceClose(&lDriverHandle);

    getch();
    printf("\nPress any key to exit....");
    getch();

}//main

/**********************************************************************
 * Function: ErrorHandler
 *           Show the error message for the corresponding error code
 * input:    dwErrCde, IN, Error code
 * return:   none
 **********************************************************************/
void ErrorHandler(DWORD dwErrCde)
{
    char szErrMsg[180];

    DRV_GetErrorMessage(dwErrCde, szErrMsg);
    printf("\nError(%d): %s\n", dwErrCde & 0xffff, szErrMsg);
}//ErrorHandler

/**********************************************************************
 * Function:   ErrorStop
 *             Release all resource and terminate program if error occurs 
 * Paramaters: pDrvHandle, IN/OUT, pointer to Driver handle
 *             dwErrCde, IN, Error code.
 * return:     none             
 **********************************************************************/
void ErrorStop(long *pDrvHandle, DWORD dwErrCde)
{
    //Error message 
    ErrorHandler(dwErrCde);
    printf("Program terminated!\n");
    
    //Close device
    DRV_DeviceClose(pDrvHandle);

    printf("Press any key to exit....");
    getch();
    exit(1);
}//ErrorStop