lcd.c

lmb162a液晶的技术资料以及原代码

#include <string.h>
#define LCD_GLOBALS
#include "Includes.h"

sbit PIN_RS = P2 ^ 2;
sbit PIN_RW = P2 ^ 1;
sbit PIN_EN = P2 ^ 0;

static void CheckBusy(void)
{
	UWORD cnt = 0;

	P0 = 0xff; // ready for input

	while (1) {
		PIN_RS = 0;
		PIN_RW = 1;
		PIN_EN = 1;
		if (((P0 & 0x80) != 0x80) || ++cnt > 500)
			break;
		PIN_EN = 0;
	}

	PIN_EN = 0;
}

#define WriteIns	LcdWriteIns
void LcdWriteIns(UBYTE i)
{
	CheckBusy();

	PIN_RS = 0;
	PIN_RW = 0;
	
	PIN_EN = 1;
	P0 = i;
	PIN_EN = 0;
}

void LcdWriteData(UBYTE d)
{
	CheckBusy();

	PIN_RS = 1;
	PIN_RW = 0;
	
	PIN_EN = 1;
	P0 = d;
	PIN_EN = 0;
}

#if 0
static void WriteIns(UBYTE i)
{
	CheckBusy();

	PIN_RS = 0;
	PIN_RW = 0;
	
	PIN_EN = 1;
	P0 = i;
	PIN_EN = 0;
}

static void WriteData(UBYTE d)
{
	CheckBusy();

	PIN_RS = 1;
	PIN_RW = 0;
	
	PIN_EN = 1;
	P0 = d;
	PIN_EN = 0;
}

void LcdDispCtl(UBYTE c)
{
	WriteIns(0x08 + (c & 0x07));
}

void LcdDispClr(UBYTE type)
{
	if (type == LCD_CLR_ALL)
		WriteIns(0x01);
	else {
		UBYTE i;
		
		if (type == LCD_CLR_FL)
			WriteIns(0x80);
		else if (type == LCD_CLR_SL)
			WriteIns(0xc0);
		else
			return;

		for (i = 0; i < LINE_FACT_WIDTH; i ++)
			WriteData(' ');
	}
}

void LcdCurPos(UBYTE row, UBYTE col)
{
	UBYTE n = row * LINE_MAX_WIDTH + col;

	LcdDispCtl(LCD_BLK_ON | LCD_CUR_ON | LCD_DISP_ON);
	
	WriteIns(0x80 + row * LINE_MAX_WIDTH + col);
}
//#endif

void LcdDispBuf(UBYTE row, UBYTE col, UBYTE len, const void *buf)
{
	UBYTE *p = (UBYTE *)buf;
	
	LcdWriteIns(0x80 + row * DISPLAY_MLEN + col);

	while (len --) {
		LcdWriteData(*p);
		
		if ((row == 0) && (++ col >= DISPLAY_FLEN)) {
			row = 1;
			LcdWriteIns(0x80 + DISPLAY_MLEN);
		}
		
		p ++;
	}
}

//#if 0
void LcdDispMult(UBYTE row, UBYTE col, UBYTE n, UBYTE asc)
{
	WriteIns(0x80 + row * LINE_MAX_WIDTH + col);

	while (n --) {
		WriteData(asc);
		
		if ((row == 0) && (++ col >= LINE_FACT_WIDTH)) {
			row = 1;
			WriteIns(0x80 + LINE_MAX_WIDTH);
		}
	}
}

void LcdDispAsc(UBYTE row, UBYTE col, const void *buf)
{
	UBYTE len = strlen(buf);

	LcdDispBuf(row, col, len, buf);
}

UBYTE LcdDispNum(UBYTE row, UBYTE col, ULONG num)
{
	UBYTE i, buf[10];

	for (i = 0; i < 10; i ++) {
		buf[9 - i] = num % 10 + 0x30;
		num /= 10;
	}

	for (i = 0; i < 9; i ++) {
		if (buf[i] != 0x30)
			break;
	}

	LcdDispBuf(row, col, 10 - i, &buf[i]);

	return 10 - i;
}
#endif

// initial
void LcdInit(void)
{
	PIN_RS = 0;
	PIN_RW = 0;
	PIN_EN = 0;

	// set function
	WriteIns(0x38); // 8 bit initerface, 2 line display, 5 * 7 dots

	// display on/off
	WriteIns(0x0c); // display on, cursor off, blink off

	// display clear
	WriteIns(0x01);
	
	// entry mode set
	WriteIns(0x06); // increase, display is not shifted
}