Nisar
Joined: 16 Nov 2007
Posts: 20
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| 16x2 LCD 8 Data bit ready code for every one |
 Posted: Sat Mar 28, 2009 3:02 am |
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| Code: |
/*=========================================
8-BIT LCD DRIVER FOR PIC16F877A CCSC
==========================================*/
///////////////////////////////////////////////////////////////////
// CCS C Compiler
// LCD 16x2
//
// by Nisar Ahmed
// 2009/03/27
//////////////////////////////////////////////////////////////////
#include <16F877.h> // PIC16F877 header file
#use delay(clock=4000000) // for 4Mhz crystal
#fuses XT, NOWDT, NOPROTECT, NOLVP // for debug mode
#define PORT_A 0 // define for function output()
#define PORT_B 1
#define PORT_C 2
#define PORT_D 3
#define PORT_E 4
#define NCHAR_PER_LINE 16 // max char numbers per line
#define LCD_RS PIN_A1
#define LCD_RW PIN_A2
#define LCD_E PIN_A3
#define LCD_DAT PORT_D
///////////////////////////////////////////////// output()
//lcd data bus output
void output(int8 port, int8 dat)
{
switch(port)
{
case PORT_A: output_a(dat); break;
case PORT_B: output_b(dat); break;
case PORT_C: output_c(dat); break;
case PORT_D: output_d(dat); break;
case PORT_E: output_e(dat); break;
default : //??? port maybe error!
break;
}
}//end output()
//////////////////////////////////////////////// lcd_write_cmd()
//
void lcd_write_cmd(int8 cmd)
{
delay_us(400);
output_low(LCD_RS);
output_low(LCD_RW);
output(LCD_DAT, cmd);
output_high(LCD_E);
delay_us(400);
output_low(LCD_E);
}//end lcd_write_cmd()
/////////////////////////////////////////////// lcd_write_dat()
//
void lcd_write_dat(int8 dat)
{
delay_us(400);
output_high(LCD_RS);
output_low(LCD_RW);
output(LCD_DAT, dat);
output_high(LCD_E);
delay_us(400);
output_low(LCD_E);
}//end lcd_write_dat()
//////////////////////////////////////////// lcd_init()
//
void lcd_init(void)
{
output_low(LCD_E); // Let LCD E line low
lcd_write_cmd(0x38); // LCD 16x2, 5x7, 8bits data
delay_ms(15);
lcd_write_cmd(0x01); // Clear LCD display
delay_ms(10);
lcd_write_cmd(0x0f); // Open display & current
delay_ms(10);
lcd_write_cmd(0x06); // Window fixed
delay_ms(10);
}//end lcd_init()
///////////////////////////////////////// lcd_display_char()
//
void lcd_display_char(int8 line, int8 pos, int8 ch)
{
int8 tmp;
line = (line==0) ? 0 : 1;
pos = (pos >NCHAR_PER_LINE) ? NCHAR_PER_LINE : pos;
tmp = 0x80 + 0x40*line + pos;
lcd_write_cmd(tmp);
lcd_write_dat(ch);
}//end lcd_display_char()
/////////////////////////////////////////// lcd_display_str()
//
void lcd_display_str(int8 line, char str[])
{
int8 i;
for(i=0; i<NCHAR_PER_LINE; i++)
{
lcd_display_char(line, i, ' ');
}
for(i=0; i<NCHAR_PER_LINE; i++)
{
if(str[i] == '\0') break;
lcd_display_char(line, i, str[i]);
}
}//end lcd_display_str()
/*=======================================*/
void main(void)
{
char LINE2[] = { "PIC16F877 CCSC " };
int8 i;
lcd_init();
for(i=0; i<NCHAR_PER_LINE; i++)
{
lcd_display_char(0, i, '0'+i);
}
//lcd_display_str(1, "PIC16F877A CCSC ") //CCSC can't compile
lcd_display_str(1, LINE2);
}//end main()
|
Regards
Nisar ahmed |
|
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