#include <12864.h>
#include "delay.h"
sbit RS = P2^2;
sbit RW = P2^3;
sbit E = P2^4;
sbit RES = P2^7;
sbit PSB = P2^5;
#define DataPort P0 //MCU P0<------> LCM
unsigned char code user16x16[]={ //笑臉圖片
0x0F,0xF0,0x10,0x08,0x20,0x04,0x40,0x02,0x9C,0x39,0xBE,0x7D,0x80,0x01,0x80,0x01,
0x80,0x01,0x88,0x11,0x84,0x21,0x43,0xC2,0x20,0x04,0x10,0x08,0x0F,0xF0,0x00,0x00,
};
/*------------------------------------------------
檢測忙位
------------------------------------------------*/
void Check_Busy()
{
RS=0;
RW=1;
E=1;
DataPort=0xff;
while((DataPort&0x80)==0x80);//忙則等待
E=0;
}
/*------------------------------------------------
寫命令
------------------------------------------------*/
void Write_Cmd(unsigned char Cmd)
{
Check_Busy();
RS=0;
RW=0;
E=1;
DataPort=Cmd;
DelayUs2x(5);
E=0;
DelayUs2x(5);
}
/*------------------------------------------------
寫數(shù)據(jù)
------------------------------------------------*/
void Write_Data(unsigned char Data)
{
Check_Busy();
RS=1;
RW=0;
E=1;
DataPort=Data;
DelayUs2x(5);
E=0;
DelayUs2x(5);
}
/*------------------------------------------------
液晶屏初始化
------------------------------------------------*/
void Init_ST7920()
{
DelayMs(40); //大于40MS的延時程序
PSB=1; //設(shè)置為8BIT并口工作模式
DelayMs(1); //延時
RES=0; //復位
DelayMs(1); //延時
RES=1; //復位置高
DelayMs(10);
Write_Cmd(0x30); //選擇基本指令集
DelayUs2x(50); //延時大于100us
Write_Cmd(0x30); //選擇8bit數(shù)據(jù)流
DelayUs2x(20); //延時大于37us
Write_Cmd(0x0c); //開顯示(無游標、不反白)
DelayUs2x(50); //延時大于100us
Write_Cmd(0x01); //清除顯示，并且設(shè)定地址指針為00H
DelayMs(15); //延時大于10ms
Write_Cmd(0x06); //指定在資料的讀取及寫入時，設(shè)定游標的移動方向及指定顯示的移位，光標從右向左加1位移動
DelayUs2x(50); //延時大于100us
}
/*------------------------------------------------
用戶自定義字符
------------------------------------------------*/
void CGRAM()
{
int i;
Write_Cmd(0x30);
Write_Cmd(0x40);
for(i=0;i<16;i++)
{
Write_Data(user16x16[i*2]);
Write_Data(user16x16[i*2+1]);
}
}
/*------------------------------------------------
顯示用戶自定義字符
------------------------------------------------*/
void DisplayCGRAM(unsigned char x,unsigned char y)
{
switch(y)
{
case 1: Write_Cmd(0x80+x);break;
case 2: Write_Cmd(0x90+x);break;
case 3: Write_Cmd(0x88+x);break;
case 4: Write_Cmd(0x98+x);break;
default:break;
}
Write_Data(00);
Write_Data(00);
}
/*------------------------------------------------
顯示字符串
x:橫坐標值，范圍0~8
y:縱坐標值，范圍1~4
------------------------------------------------*/
void LCD_PutString(unsigned char x,unsigned char y,unsigned char code *s)
{
switch(y)
{
case 1: Write_Cmd(0x80+x);break;
case 2: Write_Cmd(0x90+x);break;
case 3: Write_Cmd(0x88+x);break;
case 4: Write_Cmd(0x98+x);break;
default:break;
}
while(*s>0)
{
Write_Data(*s);
s++;
DelayUs2x(50);
}
}
/*------------------------------------------------
清屏
------------------------------------------------*/
void ClrScreen()
{
Write_Cmd(0x01);
DelayMs(15);
}
main()
{
unsigned char i, num=0,j;
unsigned char temp[7;//定義顯示區(qū)域臨時存儲數(shù)組
float Voltage; //定義浮點變量
CGRAM(); //寫入自定義字符
Init_ST7920(); //初始化
ClrScreen();
while(1)
{
for(j=0;j<5;j++)
num=ReadADC(0);
Voltage=(float)num*5/256;
sprintf(temp,"%d",Voltage);
Init_ST7920(); //初始化
LCD_PutString(0,3,"顯示:");
LCD_PutString(4,3,temp);
DisplayCGRAM(7,1); //在第一行第一個位置和
DisplayCGRAM(0,1); //最后一個位置寫入自定義圖片笑臉
for(i=0;i<30;i++) //延時30x200ms
DelayMs(200);
ClrScreen();
}
}
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