interfacing 128x64 lcd with PIC16f877a

[jou_c]

hi, i'm trying to interface a 128x64 lcd by Lascar (SP 5-FDX1) with a PIC16f877a. can anyone tell me if this is possible by just using the PIC16f877a or do i need other ICs? the LCD comes with a SPLC 501C controller by SUNPLUS.... sorry i am new in this and haven't much idea how it all works...

 

[jou_c]

sorry, i just realise the i misname the lcd model... it's SP 5-gfx1 by lascar.... help anybody???

i've written a code based on the program i found from a website by ian frose, but not a single dot can be displayed!

i'm not sure wat's the matter... i'm using ccs compiler

#include <16f877.h>
#use delay(clock = 4000000)

//sunplus SPLC501C constants
#define page_base 0xb0
#define column_base_l 0x00
#define column_base_h 0x10

//port definition--> all pins are outputs
#define AOP PIN_B3 //determines if databits are data or command. H=data,L=command
#define reset PIN_E2 //setting is initialized when reset = 0
#define SI PIN_D7 //serial data input terminal
#define SCL PIN_D6 //serial clock input terminal
#define button PIN_B0

//#define data_eeprom 0x1f,0x00,0x00,0x00,0x00,0x00,0x00,0x00;
char ADCON1;
int RBPU;
void command_write();
void data_write();
void write_posn();
void write_next();
void clear_page();
void start_up();
void start_posn();

void serial_output(unsigned char x)
{
signed char i;

for(i=7;i>=0;i--)
{
if((x>>i)&0x01)
{
output_high(SI);
}
else
{
output_low(SI);
}
output_low(SCL);
output_high(SCL);
}
}

//write command: page and column address
void command_write(unsigned char data1)
{
output_low(AOP);
serial_output(data1);
}

//write display data
void data_write(unsigned char data2)
{
output_high(AOP);
serial_output(data2);
}


//write display data into desired position.
//parameters: page, column, data

void write_posn(unsigned char page, unsigned char column, unsigned char data)
{
command_write(page_base + (page));
command_write(column_base_h + ((column & 0xf0) >> 4));
command_write(column_base_l + (column & 0x0f));
data_write(data);
}


//write to next location --> used only after a known write position;

void write_next(unsigned char data3)
{
data_write(data3);
}


//to clear ONE page of display (for pages 0-7)

void clear_page(unsigned char page2clear)
{
unsigned char i;
write_posn(page2clear,0x00,0x00); //(page,column,data)
for(i=0;i<128;i++)
{
write_next(0x00);
}
}

//to clear ALL pages of display => clear screen
void clear_all(void)
{
unsigned char i;
for(i=0;i<8;i++)
{
clear_page(i);
}
}


//initialization of 16f877 i/o and splc501c

void start_up(void)
{
output_low(AOP);
output_high(reset);

//reset
output_low(reset); //minimum required time by splc501c is 0.5us
#asm
nop //using 16f877@4Mhz, nop takes 1us!!! CHECK THIS
#endasm
output_low(reset);

//initialization settings. refer 6.xx section of SPLC501c datasheet
command_write(0xA2); //[6.11] LCD bias set: 1/9 bias
command_write(0xA4); //[6.10] Normal display mode -->double check this!
command_write(0xC8); //[6.15] common output mode: reverse com63-com0
command_write(0x23); //[6.17] v5 voltage reg internal
command_write(0x81); //electronic volumn double (brighness control) [6.18]
command_write(read_eeprom(0x00)); //internal pic eeprom at address 0x00.
//default data is 0x1f.
//adjustable in main code from 0x00-0x3f
//then stored back into EEPROM
command_write(0x2b); //[6.16] power control circuit: vol_regON, vol_follwerON, boosterOFF
command_write(0x40); //[6.2] display start line set: line address 0
command_write(page_base); //[6.3] page address set age address 0
command_write(column_base_h); //[6.4] upper bit column address:1
command_write(column_base_l); //[6.4] lower bit column address:0
//column address = 0
command_write(0xaf); //[6.1] display ON
}


//set start position
void start_posn (unsigned char start_column, unsigned char start_page)
{
command_write(page_base + (start_page));
command_write(column_base_h + ((start_column & 0xf0)>>4));
command_write(column_base_l + (start_column & 0x0f));
}


static const unsigned char tablec [] = {

0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, //
// 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x0D,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // !
// 0x00,0x00,0x00,0x00,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // "
// 0x80,0x00,0x90,0x0C,0xD0,0x03,0xBC,0x00,0x93,0x0C,0xD0,0x03,0xBC,0x00,0x93,0x00,0x90,0x00,0x00,0x00, // #
// 0x00,0x00,0x00,0x00,0x0E,0x0C,0x13,0x08,0x21,0x08,0xFF,0x1F,0xC1,0x08,0x81,0x07,0x00,0x00,0x00,0x00, // $
// 0x0E,0x08,0x11,0x04,0x11,0x02,0x91,0x01,0x4E,0x00,0x20,0x07,0x98,0x08,0x84,0x08,0x82,0x08,0x01,0x07, // %
// 0x80,0x03,0x40,0x04,0x2E,0x08,0x31,0x08,0xD1,0x08,0x99,0x09,0x0E,0x0E,0x00,0x0C,0x00,0x0B,0xC0,0x00, // &
// 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // '
// 0x00,0x00,0x00,0x00,0x00,0x00,0xF0,0x03,0x0C,0x0C,0x06,0x18,0x02,0x10,0x01,0x20,0x01,0x20,0x00,0x00, // (
// 0x00,0x00,0x01,0x20,0x01,0x20,0x02,0x10,0x06,0x18,0x0C,0x0C,0xF0,0x03,0x00,0x00,0x00,0x00,0x00,0x00, // )
// 0x00,0x00,0x04,0x00,0x0C,0x00,0x78,0x00,0x27,0x00,0x78,0x00,0x0C,0x00,0x04,0x00,0x00,0x00,0x00,0x00, // *
// 0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0xF0,0x0F,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x00, // +
// 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x4C,0x00,0x3C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // ,
0x00,0x00,0x00,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x00,0x00,0x00,0x00, // -
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0C,0x00,0x0C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // .
// 0x00,0x00,0x00,0x20,0x00,0x18,0x00,0x06,0x80,0x01,0x60,0x00,0x18,0x00,0x06,0x00,0x01,0x00,0x00,0x00, // /
// 0x00,0x00,0xF8,0x01,0x06,0x06,0x01,0x08,0x01,0x08,0x01,0x08,0x06,0x06,0xF8,0x01,0x00,0x00,0x00,0x00, // 0
// 0x00,0x00,0x02,0x08,0x02,0x08,0x02,0x08,0xFF,0x0F,0x00,0x08,0x00,0x08,0x00,0x08,0x00,0x00,0x00,0x00, // 1
0x00,0x00,0x03,0x0C,0x01,0x0A,0x01,0x09,0x81,0x08,0x61,0x08,0x1E,0x08,0x00,0x00,0x00,0x00,0x00,0x00, // 2
// 0x00,0x00,0x00,0x00,0x01,0x08,0x21,0x08,0x21,0x08,0x21,0x08,0xDE,0x07,0x00,0x00,0x00,0x00,0x00,0x00, // 3
// 0x80,0x01,0x60,0x01,0x10,0x01,0x0C,0x01,0x02,0x01,0xFF,0x0F,0x00,0x01,0x00,0x01,0x00,0x00,0x00,0x00, // 4
0x00,0x00,0x00,0x00,0x1F,0x08,0x11,0x08,0x11,0x08,0x21,0x04,0xC1,0x03,0x00,0x00,0x00,0x00,0x00,0x00, // 5
0x00,0x00,0xF8,0x03,0x26,0x04,0x11,0x08,0x11,0x08,0x11,0x08,0x21,0x04,0xC0,0x03,0x00,0x00,0x00,0x00, // 6
// 0x00,0x00,0x01,0x00,0x01,0x0C,0x81,0x03,0x61,0x00,0x19,0x00,0x05,0x00,0x03,0x00,0x00,0x00,0x00,0x00, // 7
// 0x00,0x00,0x8E,0x07,0x51,0x08,0x21,0x08,0x21,0x08,0x51,0x08,0xD1,0x04,0x0E,0x03,0x00,0x00,0x00,0x00, // 8
// 0x00,0x00,0x3C,0x00,0x42,0x08,0x81,0x08,0x81,0x08,0x81,0x08,0x42,0x06,0xFC,0x01,0x00,0x00,0x00,0x00, // 9
// 0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x0C,0x30,0x0C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // :
// 0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x4C,0x30,0x3C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // ;
// 0x00,0x00,0x00,0x00,0x80,0x01,0x80,0x01,0x40,0x02,0x40,0x02,0x20,0x04,0x20,0x04,0x10,0x08,0x00,0x00, // <
// 0x00,0x00,0x40,0x02,0x40,0x02,0x40,0x02,0x40,0x02,0x40,0x02,0x40,0x02,0x40,0x02,0x40,0x02,0x00,0x00, // =
// 0x00,0x00,0x10,0x08,0x20,0x04,0x20,0x04,0x40,0x02,0x40,0x02,0x80,0x01,0x80,0x01,0x00,0x00,0x00,0x00, // >
// 0x00,0x00,0x07,0x00,0x01,0x00,0x81,0x0D,0x41,0x00,0x21,0x00,0x13,0x00,0x0E,0x00,0x00,0x00,0x00,0x00, // ?
// 0xF8,0x01,0x0C,0x06,0x02,0x0C,0xF1,0x09,0x09,0x0A,0x05,0x0B,0xC5,0x0D,0xFE,0x03,0x00,0x02,0x00,0x02, // @
0x00,0x08,0x00,0x07,0xC0,0x01,0x38,0x01,0x0C,0x01,0x18,0x01,0x60,0x01,0x80,0x01,0x00,0x06,0x00,0x08, // A
0x00,0x00,0xFC,0x0F,0x44,0x08,0x44,0x08,0x44,0x08,0x44,0x08,0xA4,0x08,0x18,0x07,0x00,0x00,0x00,0x00, // B
0xE0,0x01,0x18,0x06,0x08,0x04,0x04,0x08,0x04,0x08,0x04,0x08,0x04,0x08,0x0C,0x08,0x00,0x00,0x00,0x00, // C
0x00,0x00,0xFC,0x0F,0x04,0x08,0x04,0x08,0x04,0x08,0x04,0x08,0x08,0x04,0xF0,0x03,0x00,0x00,0x00,0x00, // D
0x00,0x00,0xFC,0x0F,0x84,0x08,0x84,0x08,0x84,0x08,0x84,0x08,0x84,0x08,0x04,0x08,0x00,0x00,0x00,0x00, // E
0x00,0x00,0xFC,0x0F,0x84,0x00,0x84,0x00,0x84,0x00,0x84,0x00,0x84,0x00,0x04,0x00,0x00,0x00,0x00,0x00, // F
0x00,0x00,0xE0,0x01,0x18,0x06,0x08,0x04,0x04,0x08,0x04,0x08,0x84,0x08,0x84,0x08,0x8C,0x0F,0x00,0x00, // G
0x00,0x00,0xFC,0x0F,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0xFC,0x0F,0x00,0x00,0x00,0x00, // H
0x00,0x00,0x04,0x08,0x04,0x08,0x04,0x08,0xFC,0x0F,0x04,0x08,0x04,0x08,0x04,0x08,0x00,0x00,0x00,0x00, // I
0x00,0x00,0x00,0x00,0x00,0x08,0x04,0x08,0x04,0x08,0x04,0x08,0xFC,0x07,0x00,0x00,0x00,0x00,0x00,0x00, // J
0x00,0x00,0xFC,0x0F,0x40,0x00,0xC0,0x00,0x20,0x01,0x10,0x02,0x08,0x02,0x04,0x04,0x00,0x08,0x00,0x00, // K
0x00,0x00,0xFC,0x0F,0x00,0x08,0x00,0x08,0x00,0x08,0x00,0x08,0x00,0x08,0x00,0x08,0x00,0x00,0x00,0x00, // L
0xFC,0x0F,0x1C,0x00,0xF0,0x00,0x80,0x03,0x00,0x03,0xE0,0x00,0x1C,0x00,0xFC,0x0F,0x00,0x00,0x00,0x00, // M
0x00,0x00,0xFC,0x0F,0x08,0x00,0x30,0x00,0xC0,0x00,0x00,0x03,0x00,0x04,0xFC,0x0F,0x00,0x00,0x00,0x00, // N
0x00,0x00,0xF0,0x03,0x08,0x04,0x04,0x08,0x04,0x08,0x04,0x08,0x04,0x08,0x08,0x04,0xF0,0x03,0x00,0x00, // O
0x00,0x00,0xFC,0x0F,0x84,0x00,0x84,0x00,0x84,0x00,0x84,0x00,0x44,0x00,0x38,0x00,0x00,0x00,0x00,0x00, // P
0x00,0x00,0xF0,0x03,0x08,0x04,0x04,0x08,0x04,0x08,0x04,0x08,0x04,0x18,0x08,0x24,0xF0,0x23,0x00,0x00, // Q
0x00,0x00,0xFC,0x0F,0x84,0x00,0x84,0x00,0x84,0x01,0x44,0x02,0x38,0x04,0x00,0x08,0x00,0x00,0x00,0x00, // R
0x00,0x00,0x38,0x0C,0x24,0x08,0x44,0x08,0x44,0x08,0x84,0x08,0x84,0x04,0x0C,0x07,0x00,0x00,0x00,0x00, // S
0x04,0x00,0x04,0x00,0x04,0x00,0x04,0x00,0xFC,0x0F,0x04,0x00,0x04,0x00,0x04,0x00,0x04,0x00,0x00,0x00, // T
0x00,0x00,0xFC,0x03,0x00,0x0C,0x00,0x08,0x00,0x08,0x00,0x08,0x00,0x04,0xFC,0x03,0x00,0x00,0x00,0x00, // U
0x04,0x00,0x18,0x00,0xE0,0x00,0x00,0x03,0x00,0x0C,0x00,0x0C,0x80,0x03,0x60,0x00,0x18,0x00,0x04,0x00, // V
0x0C,0x00,0xF0,0x01,0x00,0x0E,0x80,0x07,0x70,0x00,0xE0,0x00,0x00,0x07,0x00,0x0E,0xF0,0x01,0x0C,0x00, // W
0x04,0x08,0x08,0x04,0x10,0x02,0x20,0x01,0xC0,0x00,0xC0,0x00,0x20,0x01,0x10,0x02,0x08,0x04,0x04,0x08, // X
0x04,0x00,0x08,0x00,0x30,0x00,0x40,0x00,0x80,0x0F,0x40,0x00,0x20,0x00,0x10,0x00,0x08,0x00,0x04,0x00, // Y
0x00,0x00,0x04,0x0C,0x04,0x0A,0x04,0x09,0x84,0x08,0x44,0x08,0x24,0x08,0x14,0x08,0x0C,0x08,0x00,0x00, // Z
// 0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x3F,0x01,0x20,0x01,0x20,0x01,0x20,0x01,0x20,0x00,0x00,0x00,0x00, // [
// 0x00,0x00,0x01,0x00,0x06,0x00,0x18,0x00,0x60,0x00,0x80,0x01,0x00,0x06,0x00,0x18,0x00,0x20,0x00,0x00, // \
// 0x00,0x00,0x01,0x20,0x01,0x20,0x01,0x20,0x01,0x20,0xFF,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // ]
// 0x00,0x00,0x00,0x02,0x80,0x01,0x70,0x00,0x1C,0x00,0x07,0x00,0x38,0x00,0xC0,0x01,0x00,0x02,0x00,0x00, // ^
// 0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0x10, // _
// 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // `
0x00,0x00,0x00,0x06,0x10,0x09,0x90,0x08,0x90,0x08,0x90,0x04,0xE0,0x0F,0x00,0x08,0x00,0x00,0x00,0x00, // a
0x00,0x00,0xFF,0x0F,0x20,0x04,0x10,0x08,0x10,0x08,0x10,0x08,0x30,0x04,0xC0,0x03,0x00,0x00,0x00,0x00, // b
0x00,0x00,0xC0,0x03,0x20,0x04,0x10,0x08,0x10,0x08,0x10,0x08,0x10,0x08,0x10,0x08,0x00,0x00,0x00,0x00, // c
0x00,0x00,0xC0,0x03,0x20,0x0C,0x10,0x08,0x10,0x08,0x10,0x08,0x20,0x04,0xFF,0x0F,0x00,0x00,0x00,0x00, // d
0x00,0x00,0xC0,0x03,0xA0,0x04,0x90,0x08,0x90,0x08,0x90,0x08,0x90,0x08,0xE0,0x08,0x00,0x00,0x00,0x00, // e
0x00,0x00,0x10,0x00,0x10,0x00,0xFE,0x0F,0x12,0x00,0x11,0x00,0x11,0x00,0x11,0x00,0x11,0x00,0x00,0x00, // f
0x00,0x00,0xC0,0x03,0x20,0x4C,0x10,0x48,0x10,0x48,0x10,0x48,0x20,0x24,0xF0,0x1F,0x00,0x00,0x00,0x00, // g
0x00,0x00,0xFF,0x0F,0x40,0x00,0x20,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0xE0,0x0F,0x00,0x00,0x00,0x00, // h
0x00,0x00,0x10,0x00,0x10,0x00,0x13,0x00,0xF3,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // i
0x00,0x00,0x00,0x40,0x10,0x40,0x10,0x40,0x13,0x40,0xF3,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // j
0x00,0x00,0xFF,0x0F,0x80,0x00,0x80,0x01,0x40,0x02,0x20,0x02,0x20,0x04,0x10,0x08,0x00,0x00,0x00,0x00, // k
0x00,0x00,0x00,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0xFF,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // l
0xF0,0x0F,0x20,0x00,0x10,0x00,0x10,0x00,0xE0,0x0F,0x20,0x00,0x10,0x00,0x10,0x00,0xE0,0x0F,0x00,0x00, // m
0x00,0x00,0xF0,0x0F,0x60,0x00,0x20,0x00,0x10,0x00,0x10,0x00,0x10,0x00,0xE0,0x0F,0x00,0x00,0x00,0x00, // n
0x00,0x00,0xC0,0x03,0x20,0x04,0x10,0x08,0x10,0x08,0x10,0x08,0x20,0x04,0xC0,0x03,0x00,0x00,0x00,0x00, // o
0x00,0x00,0xF0,0x7F,0x20,0x04,0x10,0x08,0x10,0x08,0x10,0x08,0x30,0x04,0xC0,0x03,0x00,0x00,0x00,0x00, // p
0x00,0x00,0xC0,0x03,0x20,0x0C,0x10,0x08,0x10,0x08,0x10,0x08,0x20,0x04,0xF0,0x7F,0x00,0x00,0x00,0x00, // q
0x00,0x00,0x00,0x00,0xF0,0x0F,0x40,0x00,0x20,0x00,0x10,0x00,0x10,0x00,0x70,0x00,0x00,0x00,0x00,0x00, // r
0x00,0x00,0x60,0x0C,0x90,0x08,0x90,0x08,0x10,0x09,0x10,0x09,0x10,0x06,0x00,0x00,0x00,0x00,0x00,0x00, // s
0x00,0x00,0x10,0x00,0x10,0x00,0xFC,0x07,0x10,0x08,0x10,0x08,0x10,0x08,0x10,0x08,0x00,0x00,0x00,0x00, // t
0x00,0x00,0xF0,0x07,0x00,0x08,0x00,0x08,0x00,0x08,0x00,0x04,0xF0,0x0F,0x00,0x00,0x00,0x00,0x00,0x00, // u
0x10,0x00,0xE0,0x00,0x00,0x03,0x00,0x0C,0x00,0x08,0x00,0x06,0x80,0x01,0x60,0x00,0x10,0x00,0x00,0x00, // v
0x30,0x00,0xC0,0x03,0x00,0x0C,0x00,0x07,0xE0,0x00,0xC0,0x00,0x00,0x07,0x00,0x0C,0xC0,0x03,0x30,0x00, // w
0x00,0x00,0x10,0x08,0x20,0x04,0x40,0x02,0x80,0x01,0x80,0x01,0x40,0x02,0x20,0x04,0x10,0x08,0x00,0x00, // x
0x10,0x40,0x60,0x40,0x80,0x41,0x00,0x23,0x00,0x1C,0x00,0x0C,0x00,0x03,0x80,0x00,0x60,0x00,0x10,0x00, // y
0x00,0x00,0x10,0x08,0x10,0x0C,0x10,0x0A,0x10,0x09,0x90,0x08,0x50,0x08,0x30,0x08,0x10,0x08,0x00,0x00, // z
0x00,0x00,0x00,0x00,0x80,0x00,0x80,0x00,0x7E,0x1F,0x01,0x20,0x01,0x20,0x01,0x20,0x00,0x00,0x00,0x00, // {
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // |
0x00,0x00,0x00,0x00,0x01,0x20,0x01,0x20,0x01,0x20,0x7E,0x1F,0x80,0x00,0x80,0x00,0x00,0x00,0x00,0x00, // }
0x00,0x00,0x00,0x00,0x1E,0x00,0x21,0x00,0x21,0x00,0x21,0x00,0x21,0x00,0x1E,0x00,0x00,0x00,0x00,0x00}; // º MOD

// Characters are constructed from 20 bytes. The first page bytes are at location 0, 2, 4 etc while
// the second page are at 1, 3, 5 etc. ASCII character 32 is the first entry in the look-up table.
// The table has characters 32 - 127 enabled and 128 to 255 commented out.
// Character 127 has been modified to degrees (normally 176) to allow temperature to be displayed
// Characters can be modified limited depending on space availability. On a project with limited
// memory then this table could be stored in EEPROM

unsigned char display_data (unsigned char page, unsigned char column, unsigned char x)
{
unsigned char lookup, i;
int position;
if (x >= 32)
{
x = x-32; //ASCII 32 is the first character in the lookup table
position = x * 20; //starting index--> ASCII 70 starts at 760
start_posn (column, page); //position = starting index of character = rowNumber*20columns
for (i=0; i<20; i+=2) //x = row axis
{ //i = column axis
lookup = tablec[(position+i)]; //lookup character for 1st page
write_next(lookup);
}
start_posn (column, page+1);
for (i=1;i<20;i+=2);
{
lookup = tablec[(position+i)]; //lookup character for second page
write_next(lookup); //one character is 10 columns wide and 2 pages long
}
}
return 10; //this may be removed to make space
}


void main(void)
{
unsigned char column, page, c, column_num,i,vol;
ADCON1 = 0x84;
start_up();
set_TRIS_B(0xff);
RBPU = 0;
clear_all();

// Setup display contrast, this stays on for about 16s. To cycle through the
// values connect Pin RB0 to 0V, RBO is pulled up internally. The last setting
// is saved into the PIC 16F877 internal EEPROM.

c = display_data (0,24, ('W'));
c = display_data (0,34, ('e'));
c = display_data (0,44, ('l'));
c = display_data (0,54, ('c'));
c = display_data (0,64, ('o'));
c = display_data (0,74, ('m'));
c = display_data (0,84, ('e'));
c = display_data (0,94, (' '));
c = display_data (0,104,('2'));
c = display_data (2,44, ('X'));
c = display_data (2,54, ('Y'));
c = display_data (2,64, ('T'));
c = display_data (2,74, ('E'));
c = display_data (2,84, ('C'));
c = display_data (4,24, ('S'));
c = display_data (4,34, ('O'));
c = display_data (4,44, ('L'));
c = display_data (4,54, ('U'));
c = display_data (4,64, ('T'));
c = display_data (4,74, ('I'));
c = display_data (4,84, ('O'));
c = display_data (4,94, ('N'));
c = display_data (4,104,('S'));
c = display_data (6,4, ('K'));
c = display_data (6,14, ('u'));
c = display_data (6,24, ('l'));
c = display_data (6,34, ('i'));
c = display_data (6,44, ('m'));
c = display_data (6,54, (' '));
c = display_data (6,64, ('H'));
c = display_data (6,74, ('i'));
c = display_data (6,84, ('-'));
c = display_data (6,94, ('T'));
c = display_data (6,104, ('e'));
c = display_data (6,114, ('c'));

vol = read_eeprom(0x00);
for (i=0;i<63;i++)
{
if(input(button))
{
delay_ms(50);
if (input(button))
{
vol++;
if (vol > 0x3f) vol = 0x00;
command_write(0x81); //volumn control double->brigtness control
command_write(vol); //command_write (read_eeprom(0x00))
}
}
delay_ms(250);
}

// Creates a demo with each character between ASCII 32 & 127 being displayed
// The display shows 12 characters per line and after 4 lines the display is
// cleared and restarts on the first line

while(1)
{
clear_all();
column = 0;
page = 0;
for(i=0x20;i<0x7f;i++)
{
if(column > 118)
{
column = 0;
page = page+2;
if (page > 7)
{
page = 0;
clear_all();
}
}
column_num = display_data(page,column,i);
column = column + column_num;
delay_ms(150);
}
}



}

 

[hanif]

Hi,

i would suggest that first of all view following ,



as well as some some stuff regarding SP 5-gfx1 interfacing with PIC16f..

http://www.geocities.com/g1368/Getting_Going_with_the_DMX_Issue_4.pdf

http://www.geocities.com/g13685/sub_index.html

A Graphical User Interface for the PIC18F including schematic as well as source code (you can get the idea from here)

**broken link removed**

i hope these will help you

 

[jou_c]

hi, i've read through all the websites, but it's still not working
any other ideas?

 

[T33]

hi, i am trying to do a menu selection hand held device by using graphical LCD 128x64 with PIC16F877A. The coding program i using is ccs c compiler. Since i am new in this, i am only able to display characters and i have no idea how to program a selection menu...