io.c

来自「ARM s3c44box的一些程序代码」· C语言 代码 · 共 76 行

/**********************************************************
  *
  *				Button and LED demo
  *
  **********************************************************/
#include "global_function.h"
#include "IO.h"

extern _EscFlag;

void IO_demo(void)
{
  printf("\n\n\r------------------ IO demo ------------------\n\r");
  printf(": push the button and watch the LED\n\r");
  printf(":\t\tD4\tD5\tD6\tD7\n\r");
  printf(":\t\t|\t|\t|\t|\n\r");
  printf(":\t\tK2\tK3\tK4\tK5\n\r");
  printf("\n\r: Esc to return");

  rPCONG = 0xff55;			// GPIOG: EINT4,5,6,7 + output 0,1,2,3
  rPDATG = 0xff;				// clear LED

  rPUPG     = 0x0;				//enalbel internal pull-up
  rEXTINT  = 0x0;				// Low level trigger 	
  rEXTINTPND = 0xf;					// clear pending bit
  rI_ISPC = 0xffffffff;				// clear pending bit
  rF_ISPC = 0xffffffff;
 
  pISR_EINT4567 = (int)ExtInt4567_Serv;		// locate the Int_serve function	
  rINTMSK &= (~BIT_EINT4567);       			// EINT4567 enable
 	
  while(!_EscFlag);

  rINTMSK |= BIT_EINT4567;	// EINT4567 disable
  rPDATG = 0xff;				// clear LED
}


void __irq ExtInt4567_Serv(void)
 {
 	B32	IntPendStatus;
 	B32 ExtInt4, ExtInt5, ExtInt6, ExtInt7;

 	IntPendStatus = rEXTINTPND & 0x0000000f;
 	ExtInt4 = 0;
 	ExtInt5 = 0;
 	ExtInt6 = 0;
 	ExtInt7 = 0;
 	
 	switch (IntPendStatus)
 		{
 		  case 0x1: ExtInt4 = 1; break;
  		  case 0x2: ExtInt5 = 1; break;
 		  case 0x4: ExtInt6 = 1; break;
 		  case 0x8: ExtInt7 = 1; break;
 		}

 	if(ExtInt4)
			rPDATG = rPDATG ^ 0x1;

 	if(ExtInt5)
			rPDATG = rPDATG ^ 0x2;

 	if(ExtInt6)
			rPDATG = rPDATG ^ 0x4;

 	if(ExtInt7)
			rPDATG = rPDATG ^ 0x8;
 		
 	Delay(200);
    
	rEXTINTPND = 0xf;					// clear pending bit
	rI_ISPC = BIT_EINT4567;				// clear pending bit
 }