key.c

使用ADS1.2开发ARM2410

#define KEY_G
#include "sysincludes.h"




void KeyBoardInit(void)
{

	rGPGCON &=(~((3<<22)|(3<<6)|(3<<0)));        //S701 S702 S703    IO Input Function
	
	rGPFCON &=(~(3<<4));                        //S704  

}


uchar  GetKeyValue(void)
{

	ushort value ; 
	
	
	
	value = rGPGDAT&(1<<11);

	if(value==0)
	{
		return 1;
	
	}
	
	value = rGPGDAT&(1<<3);
    if(value==0)
	{
		return 2;
	
	}
	
	value = rGPGDAT&(1<<0);
	if(value==0)
	{
		return 3;
	
	}
	
	value = rGPFDAT&(1<<2);
	if(value==0)
	{
		return 4;
	
	}
	
	return 0;
}