mcu.c

Mars-XC2S50-S-Core-V2.0开发板核心板的说明和设计文档

#include <stdio.h>
#include <AT89X52.H>
#include <intrins.h>

void outportb(unsigned char port, unsigned char nVal);
unsigned char inportb(unsigned char port);
unsigned char swap(unsigned char nVal);




main()
{

while(1)
{	

   unsigned char idata temp;
	temp = inportb(0);  //读入拨码开关的值
	outportb(2,temp ); //传送拨码开码值给cpld
}


}



	 

void outportb(unsigned char nPort, unsigned char nVal)
{
	unsigned char xdata *exAddress;
	 exAddress=0xff00+nPort;
	*exAddress = nVal;
}

unsigned char inportb(unsigned char nPort)
{
   unsigned char nVal;
   unsigned char xdata *exAddress;
   exAddress=0xff00+nPort;
   nVal = *exAddress;
   return nVal;
}