exint4.c

利用DSK6711外部

//* exint4.c                                        

#include <c6x.h>
#include "c6711dsk.h" 
unsigned int i,count=0;
#include <stdio.h>

#define US_ICR 0x00B0
#define US_IER 0x00B2
#define US_EXTPOL 0x000B

void delay(unsigned int del); 
void testled() ;
main()
{   
 ICR =  US_ICR;// ICR =  0x0010;   		// clear IFR4=0
 IER =  US_IER; // IER =  0x0012;   		// enable int4 (eint4)and  NMI=1
 CSR |= 1;       		// GIE=1 enable Interrupt 
 EXTPOL=US_EXTPOL;// EXTPOL=0x001;    		// set EXT_INT4    
 IO_PORT=0 ;	  		// IO_PORT=0      
  printf("Start Interrupt 4,5,6,7 enable\n");
  	testled();

  while(1);  
}


interrupt void exint4_isr()
{
    
    static int intcount=0;
    IO_PORT =~0x00000000;
    delay(6000000);
   	CSR &=0xFFFE ;       		// GIE=1 disable Interrupt 
   	printf("C6711DSK_Interrput4...%d\n",++intcount);
	i=  ~0x4000000;   //