main.c

凌阳驱动HD7279键盘（4×4

#include <SPCE061A.h>
#include <zuo.h>

volatile unsigned int *P_WatchDog_Clear = (unsigned int*)(0x7012);

/*------------------主程序--------------------*/
int main()
{ 
  unsigned char key;
  *P_SystemClock = 0x0020;   //PLL:20.48MHz  CPU:20.48MHz	
  *P_IOA_Dir = 0xfff7;   
  *P_IOA_Attrib = 0xffff;  //why it must be ffff and not 0000
  *P_IOA_Data = 0x0000;
  
  while (1)
  {
  while(*P_IOA_Data&0x0008)
 	{  
       *P_Watchdog_Clear=1;
 	}
 key = read7279(); 
  switch(key)
  {
  	case '0':  
  	//wr_lcd(dat,'0'); 
  	break;
 
 	}
 // *P_WatchDog_Clear = 0x0001;
 //}
  *P_WatchDog_Clear = 0x0001;
  }
 return 0;
}