io.c

来自「2005年全国大学生电子设计竞赛论文集」· C语言 代码 · 共 33 行

#include "Global.h"
#include "IO.h"
//=========================================================================================
//
//=========================================================================================
void WriteBus(unsigned char dat,unsigned addr)
{
	unsigned int tmp = addr<<8;
	*P_IOA_Data = ((*P_IOA_Buffer)&0x00FF)|tmp;
	SET_PORTA(BUS_ALE);
	CLR_PORTA(BUS_ALE);
	tmp = dat<<8;
	*P_IOA_Data = ((*P_IOA_Buffer)&0x00FF)|tmp;
	SET_PORTA(BUS_WRITE);
	CLR_PORTA(BUS_WRITE);
}
//=========================================================================================
//
//=========================================================================================
unsigned char ReadBus(unsigned char addr)
{
	unsigned int tmp = addr<<8;
	*P_IOA_Data = ((*P_IOA_Buffer)&0x00FF)|tmp;
	SET_PORTA(BUS_ALE);
	CLR_PORTA(BUS_ALE);
	SET_PORTA(BUS_READ);
	tmp = (*P_IOA_Data)&0xFF00;
	CLR_PORTA(BUS_READ);
	
	return tmp>>8;
}

//void Write