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Louati
Joined: 26 Mar 2012
Posts: 16
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| pic 18F4550 - ccs-PCB - LCD communication "LM044L" |
 Posted: Mon Aug 27, 2012 7:00 am |
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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);
} |
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temtronic
Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario
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| Posted: Mon Aug 27, 2012 9:00 am |
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...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 |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19504
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| Posted: Mon Aug 27, 2012 9:19 am |
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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);
}
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Best Wishes |
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Louati
Joined: 26 Mar 2012
Posts: 16
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| Posted: Mon Aug 27, 2012 2:19 pm |
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Yeah the flex_lcd do work  thank you |
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