RT12232F st7920驱动程序_AVR单片机

RT12232F st7920驱动程序

点击数：7624 次录入时间：03-04 11:50:53 整理：http://www.55dianzi.com AVR单片机

#ifndef __LCD_H__
#define __LCD_H__

#include "type.h"

//LCM122*32 PIN define
#define CLK                 PORTC.5     //pc5
#define SID                 PORTC.4     //pc4
#define CS                  PORTB.4     //pb4

#define SET_CLK()           CLK = 1;
#define CLR_CLK()           CLK = 0;
#define SET_SID()           SID = 1;
#define CLR_SID()           SID = 0;
#define LCD_Enable()        CS = 1;
#define LCD_DISAble()       CS = 0;

#define SID_PIN_IN()        DDRC.4 = 0;
#define SID_PIN_OUT()       DDRC.4 = 1;
#define CLK_PIN_OUT()       DDRC.5 = 1;
#define CS_PIN_OUT()        DDRB.4 = 1;

#define SID_PIN             PINC.4 //read pinx, not port!
#define LCD_Hi_Z()          DDRC &= 0xCF;

//lcd serial command
//#define LCD_WRITE_COMMAND   0b11111000
//#define LCD_WRITE_DATA      0b11111010
//#define LCD_READ_STATUS     0b11111100
//#define LCD_READ_DATA       0b11111110

#define LCD_WRITE_COMMAND   0xF8
#define LCD_WRITE_DATA      0xFA
#define LCD_READ_STATUS     0xFC
#define LCD_READ_DATA       0xFE

void serial_write_byte(byte data);
byte serial_read_byte(void);

void LCDWriteCmd(byte command);
void LCDWritEDAta(byte data);
void InitLCD(void);
void LCD_Write_CGRAM(byte nBytes);
void LCD_Write_CGRAM(byte nBytes);
void writechar(byte value);
void writestring(byte flash *strn);
void gotoxy(byte line, byte position);
void LCDclrscr(void);
void blink(byte on_off);
void writeNumber(word value);

#endif

/*------------------------------------------------------------
FileName     : lcd.c
Created by   : ZhengYanbo
Created date : 2006.3.17
Last modified: 2006.3.17
Comments:    : serial drive for st7920
-------------------------------------------------------------*/

#include "lcd.h"
#include "type.h"

/*
flash byte CGRAM[128] =
{
//目录循环
0xE3,0x9E,0x91,0x11,0x89,0x11,0x89,0x1E,
0x89,0x14,0x91,0x12,0xE3,0x91,0x00,0x00,
0x00,0x00,0x3F,0xFC,0x40,0x02,0x40,0x42,
0x40,0x82,0x3D,0xFC,0x00,0x80,0x00,0x40,

//文件循环
0xEE,0x8F,0x84,0x88,0x84,0x88,0xE4,0x8E,
0x84,0x88,0x84,0x88,0x8E,0xEF,0x00,0x00,
0x00,0x00,0x3F,0xFC,0x40,0x02,0x40,0x22,
0x40,0x42,0x3E,0xFC,0x00,0x40,0x00,0x20,

//随机模式
0xE1,0x1B,0x92,0x95,0x94,0x55,0xE7,0xD5,
0xA4,0x51,0x94,0x51,0x00,0x00,0x00,0x00,
0x00,0x00,0x3F,0xFC,0x40,0x02,0x40,0x42,
0x40,0x82,0x3D,0xFC,0x00,0x80,0x00,0x40,

//磁盘循环
0xCE,0x74,0xA4,0x84,0x94,0x85,0x94,0x66,
0x94,0x14,0xA4,0x16,0xCE,0xE5,0x00,0x00,
0x00,0x00,0x3F,0xFC,0x40,0x02,0x40,0x42,
0x40,0x82,0x3D,0xFC,0x00,0x80,0x00,0x40
}; */

//**********************************************************
//用串行方式写一个字节数据到LCD
void serial_write_byte(byte data)
//**********************************************************
{
    byte i;

    //SID pin output mode
    SID_PIN_OUT();
    CLK_PIN_OUT();
    CS_PIN_OUT();
    for(i=0; i<8; i++)
    {
    if(data & 0x80)
     SET_SID();
    else
     CLR_SID();
    //send clk
    CLR_CLK();
    #asm("nop");
    SET_CLK();
    data<<=1;
    }
}

//**********************************************************
//以串行方式从LCD中读一个字节,返回数据
byte serial_read_byte(void)
//**********************************************************
{
    byte i, temp=0;

    //SID pin input mode
    SID_PIN_IN();
    CLK_PIN_OUT();
    CS_PIN_OUT();
    for(i=0; i<8; i++)
    {
    temp<<=1;
    //send clk
    CLR_CLK();
    #asm("nop");
    SET_CLK();
    //wait pin steady
    #asm("nop");
    temp = (byte)SID_PIN;
    }
    return(temp);
}

//**********************************************************
//读LCD的状态,读出BF信号
byte LCD_read_status(void)
//**********************************************************
{
    byte temp;

    LCD_Enable();
    //send 0b11111100

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