ocm4x8c.c

液晶显示的程序

//
//rebuild on 2004/03/16
//ocm4x8c and with character mold lcd compatible provided
//pin4:RS(CS) connect to A1
//pin5:RW     connect to A0
//
//!!the follow is important ,please vary the address 0x4000 accord to your hardware!!
// 
//pin6:EN=(!A_LCD)&(!(WRn&RDn)  ;HARDWARE connect:WRn and RDn is 8031 P3.6,P3.7 respectively;
//				A_LCD is 74138 output Y2n,also as 8031 address of 0x4000
//				74138 input A connect to 8031 P2.7(A15),B to P2.6(A14),C to P2.5(A13)
//
//pin7:DB0 	connect to D0
//...		...
//pin14:DB7	connect to D7
//pin15:connect to vcc,parallel mode
//pin16:not used
//pin17:RESETn   not used
//
//D0-D7 is the data bus,and A0-A15 is the address bus(so you must use a 74373)
//
//


#ifdef OCM4X8C
#include <absacc.h>
#include "..\h\OCM4X8C.h"

bit CheckBusy(void)		//返回值为1，说明正忙
{

if(XBYTE[OCM4X8C_READ_INSTRUCTION]>=0x80)return(1);
else return(0);
}
byte ReadAC(void)		// AC as the ADDRESS COUNTER
{
return(XBYTE[OCM4X8C_READ_INSTRUCTION]&0x7F);
}

void WaitMode(void)
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=CLEAR_DISPLAY;		//clear all DDRAM(20h),set AC to 00h
}

void OCM4X8C_initial(void)
{
WaitMode();
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=DISPLAY_STATUS+7;	//whole display on,index on,index position on
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=SET_ENTRANCE_POINT+2;//index shift right;whole display no move 
}

void IndexShiftLeft(void)
//index shift left 16 pixels,but not clear display,it will be replaced by the follow character.
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=0x10;
}

void IndexShiftRight(void)
//index shift right as 16 pixels,left a space
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=0x14;
}

void SetCGRAM(byte AC)
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=SET_CGRAM+AC;
}

void SetDDRAM(byte AC)
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=SET_DDRAM+AC;
}
/*
void WholeShiftLeft(void)
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=0x18;
}

void WholeShiftRight(void)
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=0x1c;
}
*/

void SetToBasicOperation(void)		//基本指令集动作
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=SET_FUNCTION_BASIC;
}

void SetToExtendOperation(void)		//扩展指令集动作
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=SET_FUNCTION_EXTEND;
}

void BackWhite(byte line)		//扩展指令集动作,line=0--3
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=BACK_WHITE+line;
}

void DrawOn(void)			//扩展指令集动作,绘图显示开
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=DRAW_ON;
}

void DrawOff(void)
{
while(CheckBusy());
XBYTE[OCM4X8C_WRITE_INSTRUCTION]=DRAW_OFF;
}

void DisplayCGRAM(byte index)
{
//index should be valued in 00h to 03h
	while(CheckBusy());
	XBYTE[OCM4X8C_WRITE_DATA]=0;
	while(CheckBusy());
	XBYTE[OCM4X8C_WRITE_DATA]=2*index;
}

void SetStartPoisition(byte line,byte x)
{
byte line_real;
switch(line)
	{
	case 1:line_real=0;break;
	case 2:line_real=0x10;break;
	case 3:line_real=8;break;
	case 4:line_real=0x18;break;
	}
SetDDRAM(line_real+x-1);
}
void NextLine(void)
{
	while(CheckBusy());
	switch(ReadAC())
	{
	case 0x08:SetDDRAM(0x10);break;
	case 0x18:SetDDRAM(0x08);break;
	case 0x10:SetDDRAM(0x18);break;
	case 0x20:WaitMode();break;
    }

}
bit CheckOdd;
void DisplayChar(byte Char)
{
	while(CheckBusy());
	XBYTE[OCM4X8C_WRITE_DATA]=Char;
	CheckOdd^=1;

	if(!CheckOdd) NextLine();

}
void DisplayEChar(byte EChar)
{
//EChar should be valued in 01h to 7fh
if((EChar>0)&&(EChar<0x80))
	{

	while(CheckBusy());
	XBYTE[OCM4X8C_WRITE_DATA]=EChar;
	CheckOdd^=1;

	if(!CheckOdd) NextLine();

	}
}

void DisplayCChar(word CChar)
{
//CChar should be valued in 0xa1a1 to 0xf7fe,
//in which ,0xa1a0 to 0xa9ff is special characters,
//0xb0a1 to 0xd7fe is the class 1 chinese characters,
//0xd8a1 to 0xf7fe is the class 2 chinese characters.
byte high,low;
high=CChar>>8;
low=CChar;
if((high>0xa0)&&(high<0xf8)&&(low>0xa0)&&(low<0xff))
	{

	while(CheckBusy());
	XBYTE[OCM4X8C_WRITE_DATA]=high;	//higer 8bit,should be bigger than or equal to 0xa0
	while(CheckBusy());
	XBYTE[OCM4X8C_WRITE_DATA]=low;	//lower 8bit,should be bigger than or equal to 0xa0

	NextLine();
	}

}

void DisplayString(byte *string)
{
byte i=0;
while(*(string+i)!=LCD_STRING_END)
	{
	DisplayChar(*(string+i));
	i++;
	}
}


void DisplayNumber(word number)
{
byte NumDisplay[5];
byte i,*string;
bit rtn=0;

	NumDisplay[0]=number/10000;			//最高位
	number-=NumDisplay[0]*10000;

	NumDisplay[1]=number/1000;
	number-=NumDisplay[1]*1000;

	NumDisplay[2]=number/100;
	number-=NumDisplay[2]*100;

	NumDisplay[3]=number/10;
	number-=NumDisplay[3]*10;

	NumDisplay[4]=number;

	string=NumDisplay;
	
for(i=0;(i<5)&&(rtn==0);i++)			//寻找第一个不为0的数字位置//保证至少输出一个数字
	{
	 if(*(string+i)!=0) rtn=1;
	 	
	}


for(i-=1;i<5;i++)
	{
	  DisplayEChar(*(string+i)+0x30);
    }

}




#endif