12864LCD动态显示

/*------------------------------------------------------------------------------

PC2 PC3 PC4 PC5 PC6 PC7 PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7

RS R/W E PSB NC RST DB0 DB1 DB2 DB3 DB4 DB5 DB6 DB7

RS高电平写数据，低电平写指令代码.R/W高电平为读，低电平为写

E为使能信号，PSB高电平为并行模式，低电平为串行模式，RST低电平有效

显示地址:80H,81H,......86H,87H.第一行显示地址

90H,91H,......96H,97H.第二行显示地址

88H,89H,......8EH,8FH.第二行显示地址

98H,99H,......9EH,9FH.第三行显示地址

写指令01H:显示清屏,写指令02H: 位址归位,写指令0CH:开显示(无游标,不反白)

写指令30H:基本指令集,写指令80H:设置DDRAM,写指令10H:显示HCGROM

------------------------------------------------------------------------------*/

#include

#include

#define RS_H DDRC |= (1<<2);PORTC |= (1<<2); //RS设为高电平

#define RS_L DDRC |= (1<<2);PORTC &= ~(1<<2); //RS设为低电平

#define RW_H DDRC |= (1<<3);PORTC |= (1<<3); //RW设为高电平

#define RW_L DDRC |= (1<<3);PORTC &= ~(1<<3); //RW设为低电平

#define E_H DDRC |= (1<<4);PORTC |= (1<<4); //E设为高电平

#define E_L DDRC |= (1<<4);PORTC &= ~(1<<4); //E设为低电平

#define RST_H DDRC |= (1<<7);PORTC |= (1<<7); //RST为高电平

unsigned char MainMenu0[] = {"第二课堂胜风电子"};

unsigned char MainMenu1[] = {"数据为："};

unsigned char Shuzi[13] = {'0','1','2','3','4','5','6','7','8','9','.','-','+'};

/***********************函数功能：LCD延时子程序入口参数：t********************/ void delay(unsigned int t)

{ unsigned int i,j;

for(i=0;i

for(j=0;j<10;j++);

}

/***********************函数功能：端口初始化***********************************/ void PORT_init()

{ PORTA = 0xFF;

DDRA = 0xFF;

PORTC = 0xCE;

DDRC = 0xCE;

}

/**********************函数功能：LCD测试忙程序*********************************/

/**********************RS=L,RW=H,EN=高脉冲,读取忙碌标志

DB7(BF)*****************/

unsigned char check_busy()

{ unsigned char BF; //忙标志BF

DDRA = 0X00; //端口A设为输入方式

PORTA = 0XFF;

delay(1);

RS_L; //RS=0(命令)

delay(1);

RW_H;

delay(1);

E_H; //EN=1,使能

delay(1);

BF = PINA; //读取A口数据

delay(1);

E_L; //EN=0

delay(1);

DDRA = 0XFF; //端口A设为输出方式

BF &= 0x80; //读取lcd_data第八位

return (BF); //读取结果返回

}

/***********************函数功能：写指令数据到lcd子程序入口参数：cmd**********/ /***********************RS=L，RW=L，EN=高脉冲，DB0-DB7=指令码******************/

void lcdwc(unsigned char cmd)

{ while(check_busy()); //判断LCD是否为忙状态

RS_L; //RS=0(指令),RW=0(写)

RW_L;

PORTA = cmd; //向LCD发送指令

E_H; //EN=1,使能

delay(5);

E_L; //EN=0

}

/***********************函数功能：写入显示数据到lcd子程序入口参数：data*******/ /***********************RS=H，RW=L，EN=高脉冲，DB0-DB7=数据********************/

void lcdwd(unsigned char Data)

{ while(check_busy()); //判断LCD是否为忙状态

RS_H; //RS=1(数据),RW=0(写)

RW_L;

PORTA = Data; //向LCD写数据

E_H; //EN=1,使能

delay(5);

E_L; //EN=0

}

/***********************函数功能：lcd初始化子程序******************************/ void lcd_init()

{ delay(5);

lcdwc(0x30); //功能设置8位数据，基本指令

delay(5);

lcdwc(0x0C); //显示状态ON，游标OFF，反白OFF

delay(5);

lcdwc(0x01); //清除显示，并且设定地址指针为00H

delay(5);

lcdwc(0x02); //地址归位

delay(5);

lcdwc(0x80); //设置DDRAM地址

}

/**********************函数功能：LCD显示子程序*********************************/

/**********************入口参数：y是所选择的行号，p为写入的字符串**************/ void Char_Set_XY(unsigned char y, unsigned char *p)

{

if(y == 0)

{

lcdwc((0x80));

}

if(y == 1)

{

lcdwc((0x90));

}

if(y == 2)

{

lcdwc((0x88));

}

if(y == 3)

{

lcdwc((0x98));

}

while(*p != 0) //没写完就继续写

{

lcdwd(*p++);

}

}

/**********************函数功能：LCD浮点数显示*********************************/

/**********************入口参数：M为显示的数据，add为从哪里开始显示数据********/ void display_f(float M,unsigned char add)

{ unsigned char ledbuf[7]={0,0,0,0,0,0,0};

unsigned char i,j,k;

unsigned long m;

if(M>0) //正实数处理

{ ledbuf[0] = 12;

m = M;

if(M<10000) {m = 10*M;}

if(M<1000) {m = 100*M;}

if(M<100) {m = 1000*M;}

if(M<10) {m = 10000*M;}

}

if(M<0) //负实数处理

{ ledbuf[0] = 11;

m = -1*M;

if(M>-10000) {m = -10*M;}

if(M>-1000) {m = -100*M;}

if(M>-100) {m = -1000*M;}

if(M>-10) {m = -10000*M;}

}

ledbuf[1]=m/10000; //万位

ledbuf[2]=m%10000/1000; //千位

ledbuf[3]=m%1000/100; //百位

ledbuf[4]=m%1000%100/10; //十位

ledbuf[5]=m%1000%100%10; //个位

ledbuf[6]=10; //小数点

if(M>=0) //+号处理

{ if(M<10000) { ledbuf[6] = ledbuf[5];ledbuf[5] = 10;}

if(M<1000) { ledbuf[5] = ledbuf[4];ledbuf[4] = 10;}

if(M<100) { ledbuf[4] = ledbuf[3];ledbuf[3] = 10;}

if(M<10) { ledbuf[3] = ledbuf[2];ledbuf[2] = 10;}

}

if(M<0) //-号处理

{ if(M>-10000) { ledbuf[6] = ledbuf[5];ledbuf[5] = 10; }

if(M>-1000) { ledbuf[5] = ledbuf[4];ledbuf[4] = 10; }

if(M>-100) { ledbuf[4] = ledbuf[3];ledbuf[3] = 10; }

if(M>-10) { ledbuf[3] = ledbuf[2];ledbuf[2] = 10; }

}

lcdwc(add);

for(k=0;k<7;k++)

{ i = ledbuf[k];

j = Shuzi[i];

lcdwd(j);

}

}

/***********************函数功能：主函数***************************************/ void main(void)

{ float i = 168.88;

PORT_init(); //端口初始化

lcd_init(); //初始化LCD屏

RST_H;

Char_Set_XY(0,MainMenu0); //第一行显示

Char_Set_XY(1,MainMenu1); ////第二行显示

while(1)

{ //delay(1000);

display_f(i,0x94);

delay(100);

//i += 0.02;

//delay(1000);

}

}