epphal.c

来自「PDIUSBD12固件编程简单实例」· C语言 代码 · 共 34 行

/*本文件定义硬件层函数，根据具体的原理图需做适当修改*/

#ifdef __C51__

#include <reg51.h>                /* special function register declarations   */
#include "epphal.h"
#include "d12ci.h"
#include "mainloop.h"

extern EPPFLAGS bEPPflags;

void outportb(unsigned char port,unsigned char val)
{
	unsigned char xdata *ext_address;
	MCU_D12CS=0;
	ext_address=0xff00 + port;
	*ext_address = val;
	MCU_D12CS=1;
}

unsigned char inportb(unsigned char port)
{
	unsigned char c;
	unsigned char xdata *ext_address;
	MCU_D12CS=0;
	ext_address=0xff00 + port;
	c = *ext_address ;
	MCU_D12CS=1;
	return c;
}

#endif