12864 LCD (ks0108) driver and simulation based on AVR microcontroller-EEWORLD

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12864 LCD driver and simulation based on AVR microcontroller - Hanhai Jinyue - Hanhai Jinyue

#include

#define EN 0

#define RS 1

#define CS1 2

#define CS2 3

unsigned char a[32]={

0xEF,0xFB,0xEF,0xFC,0x2F,0xFF,0x00,0x00,0x6F,0xFF,0xEF,0xDC,0xFF,0xEF,0xBD,0x73,

0x1D,0xBC,0xAD,0xDF,0xB5,0xE7,0x39,0xB8,0xBD,0x7F,0xBF,0xBF,0x3F,0xC0,0xFF,0xFF

};

unsigned char ying[32]={

0xFF,0xBF,0xFF,0xCF,0x03,0xF0,0xFB,0xBF,0xBB,0xBF,0x7B,0xBE,0xFB,0xB1,0xDA,0xBF,

0x39,0xBF,0xFB,0x9C,0xFB,0xAF,0xFB,0xB3,0xFB,0xBC,0x1B,0xBF,0xFB,0xBF,0xFF,0xFF/*"应",0*/

};

unsigned char peng[32]={

0xFF,0x7F,0xFF,0x9F,0x01,0xE0,0xDD,0xFD,0xDD,0xBD,0xDD,0x7D,0x01,0x80,0xFF,0x7F,

0xFF,0x9F,0x01,0xE0,0xDD,0xFD,0xDD,0xBD,0xDD,0x7D,0x01,0x80,0xFF,0xFF,0xFF,0xFF/*"朋",0*/

};

unsigned char sbily1988[80]={0xFF,0xFF,0xFF,0xCC,0x7F,0xDB,0x7F,0xDB,0x7F,0xDB,0x7F,0xDB,0x7F,0xE6,0xFF,0xFF,/*"s",0*/

0xF7,0xFF,0x07,0xC0,0xFF,0xEE,0x7F,0xDF,0x7F,0xDF,0xFF,0xEE,0xFF,0xF1,0xFF,0xFF,/*"b",1*/

0xFF,0xFF,0x7F,0xDF,0x67,0xDF,0x67,0xC0,0xFF,0xDF,0xFF,0xDF,0xFF,0xFF,0xFF,0xFF,/*"i",2*/

0xFF,0xFF,0xF7,0xDF,0xF7,0xDF,0x07,0xC0,0xFF,0xDF,0xFF,0xDF,0xFF,0xFF,0xFF,0xFF,/*"l",3*/

0x7F,0x7F,0x7F,0x7E,0x7F,0x71,0xFF,0x8F,0xFF,0xE7,0x7F,0xF9,0x7F,0xFE,0x7F,0xFF,/*"y",4*/

};

void init();

void wcom(unsigned char);

void wdata(unsigned char);

void show(unsigned char data[],unsigned char,unsigned char,unsigned char);

void main()

{

heat();

while(1)

{

show(which,32,0xb9,0xb8);

show(ying,32,0xbb,0xba);

show(peng,32,0xbd,0xbc);

show(sbily1988,80,0xbf,0xbe);

while(1);

}

void init() //initialization function

{

DDRC=0xff; DDRD=0xff;

PORTC=0xff; PORTD=0xff;

wcom(0x3f); //Turn on LCD display

PORTD|=BIT(CS1); //Turn off the right half plane display

PORTD&=~BIT(CS2); //Open the left half plane display

}

void wcom(unsigned char data) //write command

{

PORTD|=BIT(ONE);

PORTD&=~BIT(RS);

PORTC=data;

PORTD&=~BIT(EN);

PORTD|=BIT(RS);

}

void wdata(unsigned char data) //write data

{

PORTD|=BIT(ONE);

PORTD|=BIT(RS);

PORTC=data;

PORTD&=~BIT(EN);

PORTD&=~BIT(RS);

}

void show(unsigned char data[],unsigned char sum,unsigned char a,unsigned char b)//显示函数

{ /*data[], font first address; sum, array length; a, next page; b previous page*/

unsigned char i;

for(i=0;i

{

if(i%2) {wcom(a); wcom(0x40+(i/2));}

else {wcom(b);wcom(0x40+(i-1)/2+1);}

wdata(data[i]);

}

Postscript: I used iccavr7.22 version. I wanted to make the font into a table and put it in flash. I tried it according to the method on the Internet.

1)“const unsigned char a[]={};

2)#pragma data:code

const unsigned char a[]={};

#pragma data:data

"All failed. In the first case, the compilation passed, but after compilation, I found that it still defined the array in RAM.

In the second case, the compilation fails and the message "cannot initialize RAM area" is always displayed.

Later I searched online for a long time and tried again flash unsigned char a[]={};

This time the compilation passed and it is easy to see that it is indeed in the flash

Area Addr Size Decimal Bytes (Attributes)

-------------------------------- ---- ---- ------- ----- ------------

lit 0054 00B0 = 176. bytes (rel,con,rom)

Addr Global Symbol

----- --------------------------------

0054 __lit_start

0054 _the

0074 _ying

0094 _peng

00B4 _sbily1988

0104 __lit_end

Here lit means it exists in flash. But one thing needs to be noted, if it is defined with flash unsigned char, the data type of the function parameter must also be flash unsigned char, otherwise an error will occur.

Reference address：12864 LCD (ks0108) driver and simulation based on AVR microcontroller

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