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**PIC16F877A** · 28/02/2010, 08h58

bonjour

voici le code

Code :

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#include <stdio.h>
#include "portio32.h"
 
#define BASE 384
 
int main()
{
	int result; //holds the error or success codes from calls to functions from PortIO32
	int value;  //holds the value read from Port B (Port 2)
	int count=0; //holds how many times the pushbutton has been pressed
	char choice;
 
	//First, we will output a notice and ask for user confirmation
	//this would not normally be done in an actual application.
	printf("Note: This program configures Port 1 as an output port.  Please be sure that you do not have interfering hardware connected to port 1 of your card.\n");
	printf("Also note that this program assumes your card's base address is %d. If that is incorrect, please edit the definition of BASE in the source code.\nContinue (Y/N)?", BASE);
	choice = getchar();
	if( (choice != 'y') && (choice != 'Y') )
		return(0);
 
	// Note that in this application, the error codes are checked on most function calls.
	// In a normal application, it would not be necessary to
	// check for errors on all of the functions, but it is done here
	// to show that it is possible.
 
	//configure the card. Port A (1) should be an output and Port B (2) and C (3) will be inputs
	result=OutByte(BASE + 3, 139); //139 is the proper control byte for this situation
	if(result == -1)//error occurred
	{
		printf("An error occurred while writing a value to a port.\n");
		return(-1);
	}
 
 
	printf("Waiting for button to be pressed.  To exit, press Ctrl-C\n");
	fflush(stdout);//fflush would not normally be used, but it is in this case because of the continuous loop
 
	while(1)//loop to monitor the state of the pushbutton
	{		//Note that this loop has no delays, so it uses up
			//all of the CPU time that it can.  This is done to
			//keep the sample code simple. In a real program,
			//it is recommended that you implement some kind
			//of sleep or timer mechanism.
		result = InByte(BASE + 1, &value);//read a value from Port B
		if(result == -1)
		{
			printf("An error occurred while reading a value from a port.\n");
			return(-1);
		}
 
		//in this sample, we will assume that when the button is pressed,
		//it results in Bit 0 being low (0)
		if( !(value & 1) )//test whether bit 0 (which has a binary weight of 1) is off
		{//the code below will execute if bit 0 was off (button pressed)
			count++;//increment counter
			printf("Count: %d\n", count);
			fflush(stdout);
 
			//output the new count to the LEDs on port A
			result=OutByte(BASE, count);
			if(result == -1)//function failed
			{
				printf("An error occurred while writing a value.\n");
				return(-1);
			}
			//Now we will wait until bit 0 goes back to being on (wait til the pushbutton is released)
			//so, we will loop while bit 0 is off
			while( !(value & 1) )
			{
				InByte(BASE + 1, &value); //note that this could be (note the R) value=InByteR(BASE + 1);
			}//end of inner while loop
		}//end of if (test for button pressed)
	}//end of while loop
	return(0);
}//end of main function