st7920.c

2407A键盘LCD读写子程序

#include "global.c" 
#include	"st7920.h"

#define	  SetRS		PADATDIR = PADATDIR | 0xFF08
#define	  ClrRS		PADATDIR = PADATDIR & 0xFFF7
#define	  SetRW		PADATDIR = PADATDIR | 0xFF10
#define	  ClrRW		PADATDIR = PADATDIR & 0xFFEF
#define	  SetE		PADATDIR = PADATDIR | 0xFF20
#define	  ClrE		PADATDIR = PADATDIR & 0xFFDF

void	LCDPIN(void)
{
		PEDATDIR = PEDATDIR | 0x0080;
		PBDATDIR = PBDATDIR & 0x00FF;
}
void	LCDPOUT(void)
{
		PEDATDIR = PEDATDIR & 0xFF7F;
		PBDATDIR = PBDATDIR | 0xFF00;
}

void	delay(Uint16  number)
{
	Uint16  j;
	for(j = 0;j < number;j++);
}	

//============================================
// 查忙
//============================================
void	Busy(void)
{
	Uint16	Temp = 0x0080;
	LCDPIN();
	delay(200);
	ClrRS;
	SetRW;
	while(Temp)
	{
		SetE;
		delay(50);
		Temp = PBDATDIR;
		Temp = Temp & 0x0080;
		ClrE;
		delay(50);
	}
}

//==========================================
// 描述：写命令函数
// 入口：’COM‘