AVR驱动Nokia3310(5V驱动3v)

动手学AVR单片机二十七、Nokia3310/5110液晶显示实验

发布:2009-6-0216:33|作者:tiankai|来源:本站|查看:672次|字号:小中大

动手学AVR单片机二十七、Nokia3310/5110液晶显示实验

一、电路实现

本实例的电路图如下：

二、Nokia3310/5110液晶介绍

Nokia3310/5110液晶的驱动控制器为PCD8544，它可以驱动48行*84列的图形显示，3310液晶的工作电压为2.7-3.3V，所以在上面的电路图中我们使用了3.3V的稳压管。另外由于单片机系统采用的是5V工作电压，并且LCD与单片机之间的连线都串接了电阻，整个系统上电后，测量电阻两端电压，会发现电阻两端有压降，这是因为单片机I/O口出来的是5V电压信号，而LCD上只能接受3.3V电压，所以电阻上产生压降。

3310液晶模块有8个引脚，由于购买厂家不同，引脚的排列也有差别，8个引脚等别是：

电源正；电源地；背景灯正；背景灯负；复位脚；时钟线；数据线；使能线；数据/命令选择线。

3310液晶支持SPI功能，可以直接使用AVR单片机的SPI来驱动3310液晶显示。本实例中我们采用模拟SPI功能实现。

三、程序代码

主程序

#include

#include

#include"LCD5110.h"

//函数声明

void Delayus(unsigned int lus);//us延时函数

void Delayms(unsigned int lms);//ms延时函数

int main(void)

{

PORTB&=~(RESET|DC|SCLK|SDIN);

DDRB|=RESET|DC|SCLK|SDIN;//设置单片机的4个LCD引脚输出0

while(1)

{

lcd_init();//lcd初始化

lcd_cls();//清屏,光标回位

lcd_gotoxy(16,2);//光标定位到第16列,第1行(最上面是0行)

lcd_putsf("NOKIA5110",9);//显示Flash里面的字符串,共9个

lcd_gotoxy(38,4);

lcd_putchar('O');//显示英文字母大写O

lcd_putchar(75);//数字75的的ASCII字符是英文字母大写K

Delayms(1000);

}

}

//us级别的延时函数

void Delayus(unsigned int lus)

{

while(lus--)

{

_delay_loop_2(3);//_delay_loop_2(1)是延时4个时钟周期，参数为3则延时12 //个时钟周期，本实验用12M晶体，则12个时钟周期为12/12=1us }

}

//ms级别的延时函数

void Delayms(unsigned int lms)

{

while(lms--)

{

Delayus(1000);//延时1ms

}

}

5110.h程序文件

/*******************************************

lcd5110.h

*******************************************/

/************************************************************* 5110LCD与单片机的连接如下

RESET PB4

D/C PB2

SDIN PB1

SCE GND

英文字库,5*8点阵,每一个字符占用5个字节,共94个可显示字符数据**/

#define RESET(1<

#define DC(1<

#define SDIN(1<

#define SCLK(1<

#define SET_RESET(PORTB|=RESET)

#define CLR_RESET(PORTB&=~RESET)

#define SET_DC(PORTB|=DC)

#define CLR_DC(PORTB&=~DC)

#define SET_SDIN(PORTB|=SDIN)

#define CLR_SDIN(PORTB&=~SDIN)

#define SET_SCLK(PORTB|=SCLK)

#define CLR_SCLK(PORTB&=~SCLK)

unsigned char data[]={

0x00,0x00,0x00,0x00,0x00,//sp

0x00,0x00,0x2f,0x00,0x00,//!

0x00,0x07,0x00,0x07,0x00,//"

0x14,0x7f,0x14,0x7f,0x14,//#

0x24,0x2a,0x7f,0x2a,0x12,//$

0x62,0x64,0x08,0x13,0x23,//%

0x36,0x49,0x55,0x22,0x50,//&

0x00,0x05,0x03,0x00,0x00,//’

0x00,0x1c,0x22,0x41,0x00,//(

0x00,0x41,0x22,0x1c,0x00,//)

0x14,0x08,0x3E,0x08,0x14,//*

0x08,0x08,0x3E,0x08,0x08,//+

0x08,0x08,0x08,0x08,0x08,//-0x00,0x60,0x60,0x00,0x00,//. 0x20,0x10,0x08,0x04,0x02,/// 0x3E,0x51,0x49,0x45,0x3E,//0 0x00,0x42,0x7F,0x40,0x00,//1 0x42,0x61,0x51,0x49,0x46,//2 0x21,0x41,0x45,0x4B,0x31,//3 0x18,0x14,0x12,0x7F,0x10,//4 0x27,0x45,0x45,0x45,0x39,//5 0x3C,0x4A,0x49,0x49,0x30,//6 0x01,0x71,0x09,0x05,0x03,//7 0x36,0x49,0x49,0x49,0x36,//8 0x06,0x49,0x49,0x29,0x1E,//9 0x00,0x36,0x36,0x00,0x00,//: 0x00,0x56,0x36,0x00,0x00,//; 0x08,0x14,0x22,0x41,0x00,//< 0x14,0x14,0x14,0x14,0x14,//= 0x00,0x41,0x22,0x14,0x08,//> 0x02,0x01,0x51,0x09,0x06,//? 0x32,0x49,0x59,0x51,0x3E,//@ 0x7C,0x12,0x11,0x12,0x7C,//A 0x7F,0x49,0x49,0x49,0x36,//B 0x3E,0x41,0x41,0x41,0x22,//C 0x7F,0x41,0x41,0x22,0x1C,//D 0x7F,0x49,0x49,0x49,0x41,//E 0x7F,0x09,0x09,0x09,0x01,//F 0x3E,0x41,0x49,0x49,0x7A,//G 0x7F,0x08,0x08,0x08,0x7F,//H

0x20,0x40,0x41,0x3F,0x01,//J

0x7F,0x08,0x14,0x22,0x41,//K 0x7F,0x40,0x40,0x40,0x40,//L 0x7F,0x02,0x0C,0x02,0x7F,//M 0x7F,0x04,0x08,0x10,0x7F,//N 0x3E,0x41,0x41,0x41,0x3E,//O 0x7F,0x09,0x09,0x09,0x06,//P 0x3E,0x41,0x51,0x21,0x5E,//Q 0x7F,0x09,0x19,0x29,0x46,//R 0x46,0x49,0x49,0x49,0x31,//S 0x01,0x01,0x7F,0x01,0x01,//T 0x3F,0x40,0x40,0x40,0x3F,//U 0x1F,0x20,0x40,0x20,0x1F,//V

0x3F,0x40,0x38,0x40,0x3F,//W 0x63,0x14,0x08,0x14,0x63,//X 0x07,0x08,0x70,0x08,0x07,//Y 0x61,0x51,0x49,0x45,0x43,//Z 0x00,0x7F,0x41,0x41,0x00,//[

0x55,0x2A,0x55,0x2A,0x55,//55 0x00,0x41,0x41,0x7F,0x00,//]

0x04,0x02,0x01,0x02,0x04,//^ 0x40,0x40,0x40,0x40,0x40,//_ 0x00,0x01,0x02,0x04,0x00,//’

0x20,0x54,0x54,0x54,0x78,//a 0x7F,0x48,0x44,0x44,0x38,//b 0x38,0x44,0x44,0x44,0x20,//c 0x38,0x44,0x44,0x48,0x7F,//d 0x38,0x54,0x54,0x54,0x18,//e

0x18,0xA4,0xA4,0xA4,0x7C,//g

0x7F,0x08,0x04,0x04,0x78,//h

0x00,0x44,0x7D,0x40,0x00,//i

0x40,0x80,0x84,0x7D,0x00,//j

0x7F,0x10,0x28,0x44,0x00,//k

0x00,0x41,0x7F,0x40,0x00,//l

0x7C,0x04,0x18,0x04,0x78,//m

0x7C,0x08,0x04,0x04,0x78,//n

0x38,0x44,0x44,0x44,0x38,//o

0xFC,0x24,0x24,0x24,0x18,//p

0x18,0x24,0x24,0x18,0xFC,//q

0x7C,0x08,0x04,0x04,0x08,//r

0x48,0x54,0x54,0x54,0x20,//s

0x04,0x3F,0x44,0x40,0x20,//t

0x3C,0x40,0x40,0x20,0x7C,//u

0x1C,0x20,0x40,0x20,0x1C,//v

0x3C,0x40,0x30,0x40,0x3C,//w

0x44,0x28,0x10,0x28,0x44,//x

0x1C,0xA0,0xA0,0xA0,0x7C,//y

0x44,0x64,0x54,0x4C,0x44,//z

0x00,0x08,0x36,0x41,0x00,//{

0x00,0x00,0x7F,0x00,0x00,//|

0x00,0x41,0x36,0x08,0x00,//}

0x08,0x10,0x08,0x04,0x08//~

};

//======================================================= ================================

void lcd_write(unsigned char byte)//写LCD函数，模拟SPI通信

unsigned char i;

for(i=128;i>0;i>>=1)

{

if(byte&i)

{

SET_SDIN;

}

else

{

CLR_SDIN;

}

CLR_SCLK;

SET_SCLK;

}

/*unsigned char i;//先写数据的高位，后写低位for(i=128;i>0;i>>=1)

{

if(byte&i)SDIN=1;else SDIN=0;

SCLK=0;SCLK=1;

}*/

}

/*上面的是模拟SPI发送数据函数，下面的是硬件SPI发送数据函数void lcd_write(unsigned char data)

{

SPCR=80;

SPDR=data;//开始发送数据

while((SPSR>>7)==0);//等待发送接收结束

}*/

//======================================================= ================================

void lcd_cls(void)//nokia3310清屏,光标复位

{

unsigned int i=0;

CLR_DC;

//DC=0;

lcd_write(128);//光标回到0列

lcd_write(64);//光标回到0行

SET_DC;

//DC=1;//准备写数据

for(i=0;i<504;i++)//写504个0数据,就是清屏

lcd_write(0);

}

//======================================================= ================================

void lcd_init(void)//nokia3310初始化函数

{

CLR_RESET;

SET_RESET;

CLR_DC;

//RESET=0;

//RESET=1;//复位结束

//DC=0;//准备写指令

lcd_write(32+1);//进入扩展指令

lcd_write(128+38);//设置Vop,相当于亮度

lcd_write(4+3);//设置温度系数,相当于对比度

lcd_write(16+3);//设置偏置,这句要与不要的实际效果好像一样

lcd_write(32+0);//进入基本指令

lcd_write(12);//使能芯片活动/垂直寻址

}

//======================================================= ================================

//光标定位,x(0-83)是列地址,y(0-5)是行地址

void lcd_gotoxy(unsigned char x,unsigned char y)

{

CLR_DC;

//DC=0;

lcd_write(x+128);

lcd_write(y+64);

}

//======================================================= ================================

void lcd_putchar(unsigned char character)//显示ASCII值的字符

{

unsigned char i=0;

unsigned int No;

No=character-32;//字模数据是由空格开始,空格字符的ASCII的值就是32

No=No*5;//每个字符的字模是5个字节

SET_DC;

//DC=1;

while(i<5)//一个字符的字模是5个字节,就是5*8点阵

{

i++;

No++;

}

lcd_write(0);//每个字符之间空一列

}

//======================================================= ==============================

void lcd_putsf(unsigned char*string,unsigned char n)//显示FLASH里面的字符串

{

unsigned char i=0;

while(i

{

lcd_putchar(string[i]);//顺序显示字符

i++;

}

}