keyscan.c

dsp28335例程

#include	"DSP2833x_Device.h"
#include 	"DSP2833x_Examples.h"   // DSP2833x Examples Include File

Uint16	ScanKey(void)
		{
			Uint16	temp,temp1;
			Uint16  flag = 0;
			while(flag==0)
				{
					temp = KeyReg;
					temp = temp & 0xff;
					while(temp==0xff)
						{
							temp = KeyReg;			
							temp = temp & 0xff;
		       			 }
		    		DELAY_US(20000);
					temp = KeyReg;			
					temp = temp & 0xff;
					temp1 = temp;
					if (temp == 0xff) flag = 0;
					else  flag = 1;		    
		        }
			temp = KeyReg;
			temp = temp & 0xff;
		    while( temp != 0xff)
		    	{
					temp = KeyReg;
					temp = temp & 0xff;
		    	}
		    return(temp1);		    			
		}



void	KeyFunction(Uint16	Temp)
		{
			switch(Temp)
				{
					case  K1: {
								KeyAck();
							  }
							  break;
					case  K2: {
								KeyAck();
							  }
							  break;
					case  K3: {
								KeyAck();
							  }
							  break;
					case  K4: {
								KeyAck();
							  }
							  break;
					case  K5: {
								KeyAck();
							  }
							  break;
					case  K6: {
								KeyAck();	
							  }
							  break;
					case  K7: {
								KeyAck();
							  }
							  break;
					case  K8: {
								KeyAck();
							  }	 		 
							  break; 			  
					default:  
							  break;
			}				  				  			  				   			  			  			   		
		}
void	KeyAck(void)
		{
			LedReg = 0x00;
			DELAY_US(500000);
			LedReg = 0xFF;			
		}				
//================================= end ===========================