vikky
Joined: 18 Oct 2007
Posts: 58
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 03 Dec 2008 14:25 driving graphic lcd |
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Hello,
I am trying to interface graphical display of 1100(controller PCF8814) with AT Mega 16.I have pasted the program below.The LCD does not work.Please tell me if something is wrong.
#include<avr/io.h>
#include<avr/interrupt.h>
#include<util/delay.h>
#include<string.h>
#define BIT(x) (1 << (x))
#define CHECKBIT(x,b) x&b
#define SETBIT(x,b) x|=b;
#define CLEARBIT(x,b) x&=~b;
#define TOGGLEBIT(x,b) x^=b;
#define SCE 0x08
#define DC 0x04
volatile char pixel_lookup[8]={0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
static const unsigned char font_lookup[96][5]=
{
{0x00, 0x00, 0x00, 0x00, 0x00},// (space)
{0x00, 0x00, 0x5F, 0x00, 0x00},// !
{0x00, 0x07, 0x00, 0x07, 0x00},// "
{0x14, 0x7F, 0x14, 0x7F, 0x14},// #
{0x24, 0x2A, 0x7F, 0x2A, 0x12},// $
{0x23, 0x13, 0x08, 0x64, 0x62},// %
{0x36, 0x49, 0x55, 0x22, 0x50},// &
{0x00, 0x05, 0x03, 0x00, 0x00},// '
{0x00, 0x1C, 0x22, 0x41, 0x00},// (
{0x00, 0x41, 0x22, 0x1C, 0x00},// )
{0x08, 0x2A, 0x1C, 0x2A, 0x08},// *
{0x08, 0x08, 0x3E, 0x08, 0x08},// +
{0x00, 0x50, 0x30, 0x00, 0x00},// ,
{0x08, 0x08, 0x08, 0x08, 0x08},// -
{0x00, 0x30, 0x30, 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},// ;
{0x00, 0x08, 0x14, 0x22, 0x41},// <
{0x14, 0x14, 0x14, 0x14, 0x14},// =
{0x41, 0x22, 0x14, 0x08, 0x00},// >
{0x02, 0x01, 0x51, 0x09, 0x06},// ?
{0x32, 0x49, 0x79, 0x41, 0x3E},// @
{0x7E, 0x11, 0x11, 0x11, 0x7E},// 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, 0x01, 0x01},// F
{0x3E, 0x41, 0x41, 0x51, 0x32},// G
{0x7F, 0x08, 0x08, 0x08, 0x7F},// H
{0x00, 0x41, 0x7F, 0x41, 0x00},// I
{0x20, 0x40, 0x41, 0x3F, 0x01},// J
{0x7F, 0x08, 0x14, 0x22, 0x41},// K
{0x7F, 0x40, 0x40, 0x40, 0x40},// L
{0x7F, 0x02, 0x04, 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
{0x7F, 0x20, 0x18, 0x20, 0x7F},// W
{0x63, 0x14, 0x08, 0x14, 0x63},// X
{0x03, 0x04, 0x78, 0x04, 0x03},// Y
{0x61, 0x51, 0x49, 0x45, 0x43},// Z
{0x00, 0x00, 0x7F, 0x41, 0x41},// [
{0x02, 0x04, 0x08, 0x10, 0x20},// "\"
{0x41, 0x41, 0x7F, 0x00, 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
{0x08, 0x7E, 0x09, 0x01, 0x02},// f
{0x08, 0x14, 0x54, 0x54, 0x3C},// g
{0x7F, 0x08, 0x04, 0x04, 0x78},// h
{0x00, 0x44, 0x7D, 0x40, 0x00},// i
{0x20, 0x40, 0x44, 0x3D, 0x00},// j
{0x00, 0x7F, 0x10, 0x28, 0x44},// 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
{0x7C, 0x14, 0x14, 0x14, 0x08},// p
{0x08, 0x14, 0x14, 0x18, 0x7C},// 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
{0x0C, 0x50, 0x50, 0x50, 0x3C},// y
{0x44, 0x64, 0x54, 0x4C, 0x44},// z
{0x00, 0x08, 0x36, 0x41, 0x00},// {
{0x00, 0x00, 0x7F, 0x00, 0x00},// |
{0x00, 0x41, 0x36, 0x08, 0x00},// }
{0x08, 0x08, 0x2A, 0x1C, 0x08},// ->
{0x08, 0x1C, 0x2A, 0x08, 0x08} // <-
};
void lcd_cmd(unsigned char cmd);
void lcd_data(unsigned char cmd);
void lcd_goto_xy(char x,char y)
{
y=y|0x40;
lcd_cmd(y);
x=(x*6)|0x80;
lcd_cmd(x);
}
void lcd_char(unsigned char character)
{
unsigned char j=0;
for(j=0;j<5;j++)
lcd_data((font_lookup[character-32][j] << 1));
}
void lcd_string(unsigned char font,unsigned char *string)
{
if(font==1)
{
unsigned char j;
lcd_cmd(0xae);
while(*string!='\0')
{
for(j=0;j<5;j++)
lcd_data((font_lookup[*string-32][j] << 1));
lcd_data(0x00);
string++;
}
}
lcd_cmd(0xaf);
}
void lcd_num_char(unsigned char num)
{
unsigned char H=0,T=0,O=0,j=0;
H=num/100;
T=(num - (H*100))/10;
O=(num - (H*100) - (T*10));
for(j=0;j<5;j++)
lcd_data(font_lookup[H+16][j]);
for(j=0;j<5;j++)
lcd_data(font_lookup[T+16][j]);
for(j=0;j<5;j++)
lcd_data(font_lookup[O+16][j]);
}
void lcd_num_int(unsigned int num)
{
unsigned char TT=0, TH=0, H=0, T=0, O=0, j=0;
TT=num/10000;
TH=(num-(TT*10000))/1000;
H=(num-(TT*10000)-(TH*1000))/100;
T=(num - (TT*10000)-(TH*1000)-(H*100))/10;
O=(num - (TT*10000)-(TH*1000) -(H*100) - (T*10));
for(j=0;j<5;j++)
lcd_data(font_lookup[TT+16][j]);
for(j=0;j<5;j++)
lcd_data(font_lookup[TH+16][j]);
for(j=0;j<5;j++)
lcd_data(font_lookup[H+16][j]);
for(j=0;j<5;j++)
lcd_data(font_lookup[T+16][j]);
for(j=0;j<5;j++)
lcd_data(font_lookup[O+16][j]);
}
char x_line=0, y_line=0;
void Gotoxy(char x,char y){
lcd_cmd(0xB0|(y&0x0F)); // Y axis initialisation: 0100 yyyy
lcd_cmd(0x00|(x&0x0F)); // X axis initialisation: 0000 xxxx ( x3 x2 x1 x0)
lcd_cmd(0x10|((x>>4)&0x07)); // X axis initialisation: 0010 0xxx ( x6 x5 x4)
lcd_data(pixel_lookup[y]);
}
void lcd_pixel(char x, char y) // 40,36
{
unsigned char x_block=0, y_block=0;
//x_block=x/16;
y_block=y/8;
y=y%8;
y_block=y_block|0x40;
lcd_cmd(y_block);
x=x|0x80;
lcd_cmd(x);
lcd_data(pixel_lookup[y]);
}
void lcd_clear(void){
unsigned int i;
lcd_cmd(0x40); // Y = 0
lcd_cmd(0xb0);
lcd_cmd(0x10); // X = 0
lcd_cmd(0x0);
lcd_cmd(0xae); // disable display;
for(i=0;i<864;i++)
lcd_data(0x00);
lcd_cmd(0xaf); // enable display;
}
void lcd_init(void)
{
CLEARBIT(PORTA, SCE)
CLEARBIT(PORTA, DC)
_delay_ms(5); // 5mS so says the stop watch(less than 5ms will not work)
SETBIT(PORTA, DC)
lcd_cmd(0x20); // write VOP register
lcd_cmd(0x90);
lcd_cmd(0xA4); // all on/normal display
lcd_cmd(0xAf);//display on
lcd_cmd(0x2F); // Power control set(charge pump on/off)
lcd_cmd(0x40); // set start row address = 0
lcd_cmd(0xb0); // set Y-address = 0
lcd_cmd(0x10); // set X-address, upper 3 bits
lcd_cmd(0x00); // set X-address, lower 4 bits
lcd_cmd(0xC8); // mirror Y axis (about X axis)
lcd_cmd(0xad);//a1 // Invert screen in horizontal axis
lcd_cmd(0xac); // set initial row (R0) of the display
lcd_cmd(0x07);
//lcd_cmd(0xF9); //
lcd_cmd(0xaf); // display ON/OFF
lcd_cmd(0xa9);
//lcd_cmd(0xE8);
lcd_clear(); // clear LCD
lcd_cmd(0xa7); // invert display
_delay_ms(500); // 1/2 Sec delay
lcd_cmd(0xa6); // normal display (non inverted)
_delay_ms(1000); // 1 Sec delay //lcd_cmd(0x21);
//lcd_cmd(0xc8);
//lcd_cmd(0x06);
// lcd_cmd(0x13);
//lcd_cmd(0x20);
// lcd_cmd(0x0c);
}
void lcd_cmd(unsigned char cmd)
{
CLEARBIT(PORTA, DC)
CLEARBIT(PORTA, SCE)
//SPDR=0xFE;
//while(!(CHECKBIT(SPSR,BIT(7)))) {}
SPDR=cmd;
while(!(CHECKBIT(SPSR,BIT(7)))) {}
SETBIT(PORTA, SCE)
}
void lcd_cmd1(unsigned char cmd)
{
CLEARBIT(PORTA, DC)
CLEARBIT(PORTA, SCE)
SPDR=0xFF;
while(!(CHECKBIT(SPSR,BIT(7)))) {}
SPDR=cmd;
while(!(CHECKBIT(SPSR,BIT(7)))) {}
SETBIT(PORTA, SCE)
}
void lcd_data(unsigned char dat)
{
SETBIT(PORTA, DC)
CLEARBIT(PORTA, SCE)
SPDR=dat;
while(!(CHECKBIT(SPSR,BIT(7)))) {}
SETBIT(PORTA, SCE)
}
void spi_write(unsigned char senddata)
{
SPDR=senddata;
while(!(CHECKBIT(SPSR,BIT(7)))) {}
}
void lcd_circle(unsigned char cx, unsigned char cy ,unsigned char radius)
{
int x, y,xchange, ychange, radiusError;
x = radius;
y = 0;
xchange = 1 - 2 * radius;
ychange = 1;
radiusError = 0;
while(x >= y)
{
lcd_pixel(cx+x, cy+y);
lcd_pixel(cx-x, cy+y);
lcd_pixel(cx-x, cy-y);
lcd_pixel(cx-x, cy+y);
//lcd_pixel(cx-x, cy-y);
//lcd_pixel(cx+x, cy-y);
lcd_pixel(cx+y, cy+x);
lcd_pixel(cx-y, cy+x);
lcd_pixel(cx-y, cy-x);
lcd_pixel(cx+y, cy-x);
y++;
radiusError += ychange;
ychange += 2;
if ( 2*radiusError + xchange > 0 )
{
x--;
radiusError += xchange;
xchange += 2;
}
}
}
int main(void)
{
unsigned int i=0;
DDRB=0xff;
DDRA=0xff;
PORTA=0xff;
SETBIT(SPSR,0)
SPCR=BIT(6)+BIT(4)+BIT(3)+BIT(2)+BIT(0);
lcd_init();
Gotoxy(10,20);
lcd_string(1,"vikky");
while(1){}
return 0;
}
The hardware connections are as below
XRES----------->PA2
SCE------------->PA3
SDIN------------->PB5
SCK-------------->PB7
VDD and VDD1 are given 3.1V supply
VSS is ground.
Please help me to find out the problem.
With Thanks and Regards
Vikky
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