 |
 |
| View previous topic :: View next topic |
| Author |
Message |
Louati
Joined: 26 Mar 2012
Posts: 16
|
| pic 18F4550 - ccs-PCB - LCD communication "LM044L" |
 Posted: Mon Aug 27, 2012 7:00 am |
 |
|
Hello,
I did some modification in LCD driver of the pic_c module to be able to use:
* port A : RA2 ... RA5 :for communication {4 bit mode}
* Pin RC0 for E
* Pin RC1 for RS
The other LCD Pins or related to the GND.
But the program did not work in reality and neither in simulation :/
Otherwise, when I use the PortB (RB2 ... RB5) pins for communication it work well !
The Code:
| Code: |
#include <18f4550.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP,PUT,NOMCLR
#USE DELAY(CLOCK=20MHZ, CRYSTAL)
#byte porta = 0xF80
#byte portb = 0xF81
#byte portc = 0xF82
#byte portd = 0xF83
#byte porte = 0xF84
#byte trisa = 0xF92
#byte trisb = 0xF93
#byte trisc = 0xF94
#byte trisd = 0xF95
#byte trise = 0xF96
//lcd
#define En PIN_C0
#define RS PIN_C1
//LCD function
void clk (void)
{
output_high(En);
delay_us(1);
output_low(En);
}
void send (int1 a,int8 data)//0 for commande ; 1 for data
{
if (a) output_high(Rs);
else output_low(Rs);
porta=data>>2;
clk();
porta=data<<2;
clk();
}
void init (void)
{
output_low(Rs);porta=12;clk();delay_ms(5);//8 bit mode
output_low(Rs);porta=12;clk();delay_ms(5);//8 bit mode
output_low(Rs);porta=12;clk();delay_ms(5);//8 bit mode
output_low(Rs);porta=8;clk();delay_us(40);//4 bit mode
//configuration selon besoin
send(0,0b00101100);delay_us(40);//mode 4 bit;4 ligne;caractere 5x10;
send(0,0b00001100);delay_us(40);//affichage on; curseur off;blinottement off;
send(0,0b00000001);delay_ms(2);//clear display
send(0,0b00000110);delay_us(40);
}
void gotoxy(int8 x,int8 y)
{
int8 adress;
switch(y){
case 1: adress=0x80;break;
case 2: adress=0xC0;break;
case 3: adress=0x94;break;
case 4: adress=0xD4;break;
}
adress+=x-1;
send(0,adress);
delay_us(40);
}
void clear(void)
{
send(0,1);
delay_ms(20);//X10
}
void write(char c)
{
send(1,c);
delay_us(40);
}
//fin lcd
void main()
{
porta=0;
portb=0;
portc=0;
portd=0;
porte=0;
trisa=0b00000011;
trisb=0b00000000;
trisc=0b10111000;
trisd=0b00001111;
trise=0b11111111;
-----------------------------------------
delay_ms(1000);
init();
gotoxy(1,1);
write('a');delay_ms(1000);
write('b');delay_ms(1000);
gotoxy(5,1);write('c');delay_ms(1000);
gotoxy(1,2); write('d');delay_ms(1000);
gotoxy(8,1);write('e');delay_ms(1000);
write('f');delay_ms(1000);
gotoxy(10,3);write('f');delay_ms(1000);
gotoxy(20,4);write('g');delay_ms(1000);
while(1);
} |
|
|
 |
temtronic
Joined: 01 Jul 2010
Posts: 9164
Location: Greensville,Ontario
|
|
| Posted: Mon Aug 27, 2012 9:00 am |
|
|
...providing your code worked 100% with real hardware....
Possible reasons include
I/O pin default setup to another use. Most pins have several uses and need to be disabled.....
incorrect use of set_tris.....function( inputs reallly an output,etc)
wrong setup time for the LCD(though you did say the code did work...)
error in wiring(easy to do....btdt !)
contrast not set right...
the 'flex_LCD driver' does work ,so you might want to look at it..
hth
jay |
|
|
Ttelmah
Joined: 11 Mar 2010
Posts: 19348
|
|
| Posted: Mon Aug 27, 2012 9:19 am |
|
|
1) Use flex lcd. Written, works, only needs you to change the pin definition table, to use _any_ combination of port pins. Safer, simpler.
2) ADC. This will default to enabled on the PORT_A pins. You are not turning this off.
| Code: |
#include <18f4550.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP,PUT,NOMCLR
#USE DELAY(CLOCK=20MHZ, CRYSTAL)
#include <flex_lcd.c>
//edit the pin definitions in the above file to:
#define LCD_DB4 PIN_A2
#define LCD_DB5 PIN_A3
#define LCD_DB6 PIN_A4
#define LCD_DB7 PIN_A5
#define LCD_E PIN_C0
#define LCD_RS PIN_C1
#define LCD_RW PIN_C0
//#define USE_LCD_RW 1 //Must be remmed out
void main(void) {
setup_adc_ports(NO_ANALOGS);
delay_ms(1000);
lcd_init();
lcd_gotoxy(1,1);
lcd_putc('a');delay_ms(1000);
lcd_putc('b');delay_ms(1000);
lcd_gotoxy(5,1);
lcd_putc('c');delay_ms(1000);
lcd_gotoxy(1,2);
lcd_putc('d');delay_ms(1000);
lcd_gotoxy(8,1);
lcd_putc('e');delay_ms(1000);
lcd_puc('f');delay_ms(1000);
lcd_gotoxy(10,3);
lcd_putc('f');delay_ms(1000);
lcd_gotoxy(20,4);
lcd_putc('g');delay_ms(1000);
while(1);
}
|
Best Wishes |
|
|
Louati
Joined: 26 Mar 2012
Posts: 16
|
|
| Posted: Mon Aug 27, 2012 2:19 pm |
|
|
Yeah the flex_lcd do work  thank you |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
