 |
 |
| View previous topic :: View next topic |
| Author |
Message |
H3rmaN
Joined: 12 Oct 2007
Posts: 5
|
| PICDEM 2 PLUS LCD Help! |
 Posted: Fri Oct 12, 2007 5:06 pm |
 |
|
Hi, Im having lots of trouble getting my PICDEM 2 PLUS to display things on the LCD!
Im using the following code:
Hello.c
| Quote: |
#include <18F452>
#fuses H4,NOOSCSEN,NOPROTECT,NOBROWNOUT,NOWDT,NOSTVREN,NOLVP,PUT
#use delay(clock=40000000)
#include "lcd.c"
void main()
{
lcd_init();
for (;;) {
delay_ms(100);
printf(lcd_putc, "\fHello");
printf(lcd_putc, "\nWorld");
}
}
|
LCD.c
| Quote: |
#define en pin_d6
#define rw pin_d5
#define rs pin_d4
#use standard_io(a)
// data lines use D port D0-D3
#define get_data() input_d()&0x0F
#define put_data(q) output_d(q&0x0F)
#use standard_io(d)
#define wait() delay_us(4)
int lcd_read_nibble()
{
int p = 0;
output_bit(rw, 1);
wait();
output_bit(en, 1);
wait();
p = get_data();
output_bit(en, 0);
wait();
return p;
}
int lcd_read_byte()
{
int low, high;
high = lcd_read_nibble();
low = lcd_read_nibble();
return ((high <<4>> 4);
lcd_write_nibble(q);
}
void wait_busy()
{
output_bit(rs, 0);
while (bit_test(lcd_read_byte(), 7));
}
void lcd_write_data(int q)
{
wait_busy();
output_bit(rs, 1);
lcd_write_byte(q);
}
void lcd_write_command(int q)
{
wait_busy();
output_bit(rs, 0);
lcd_write_byte(q);
}
int lcd_read_data()
{
output_bit(rs, 1);
return lcd_read_byte();
}
void lcd_clear()
{
lcd_write_command(0x01);
}
void lcd_home()
{
lcd_write_command(0x06);
}
void lcd_backspace()
{
lcd_write_command(0x10);
}
void lcd_panleft()
{
lcd_write_command(0x18);
}
void lcd_panright()
{
lcd_write_command(0x1c);
}
void lcd_set_mode()
{
lcd_write_command(0x28);
}
void lcd_display_on()
{
lcd_write_command(0x0c);
}
void lcd_init()
{
int i;
output_bit(rs, 0);
output_bit(rw, 0);
output_bit(en, 0);
delay_ms(15);
for (i = 1; i <= 3; ++i) {
lcd_write_nibble(0x03);
delay_ms(5);
}
lcd_write_nibble(0x02);
lcd_set_mode();
lcd_display_on();
lcd_home();
lcd_clear();
}
void lcd_gotoxy(int x, int y)
{
int address;
address = x - 1;
if (y != 1)
address |= 0x40;
lcd_write_command(0x80 | address);
}
void lcd_putc(char c)
{
switch (c) {
case '\f':
lcd_clear();
delay_ms(2);
break;
case '\n':
lcd_gotoxy(1, 2);
break;
case '\b':
lcd_backspace();
break;
default:
lcd_write_data(c);
break;
}
}
|
I've looked at the following Schamatic http://ww1.microchip.com/downloads/en/DeviceDoc/PICDEM%202%20Plus%20RoHS.pdf
And the following user guide http://ww1.microchip.com/downloads/en/DeviceDoc/PICDEM_2_Plus_Users_Guide_51275c.pdf
But Im still stuck! There also seems to be 2 types of PICDEM 2 PLUS boards from what Iv gathered! The older (Red) board with LCD pinouts A1, A2, A3. And the newer (Green) board with LCD pinouts D6, D5, D4.
I have the newer green type board. And im pretty sure that the above shematic and user guide are for my board!
I've also tried using this code that I got from here for my LCD.c file
http://www.ccsinfo.com/forum/viewtopic.php?t=24661
But I'm still not getting anything displayed on the LCD! I'm using MPLAB v7.50 and CCS PIC C Compiler 4.013
Any help appreciated!
Thanks! |
|
 |
PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
|
| Posted: Fri Oct 12, 2007 5:12 pm |
|
|
There are instructions at the end of the Flex driver post in the Code
library that explain how to use it with the new PicDem2-Plus board.
Just follow those instructions. |
|
|
H3rmaN
Joined: 12 Oct 2007
Posts: 5
|
|
| Posted: Fri Oct 12, 2007 5:44 pm |
|
|
thanks, after using your code I can now get something on the LCD, but its not what its supposed to be!
Your code was made for a PIC18F4520, but I am using a PIC18F452!
So I changed a couple of lines as shown below
I changed
| Code: | #include <18F4520.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP |
to
| Code: | #include <18F452.H>
#fuses H4, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP |
So instead of displaying
I get
Any ideas??
Thanks for the help so far! Iv not been able to display ANYTHING on this LCD till now! Been annoying me for 2 days! |
|
|
ELCouz
Joined: 18 Jul 2007
Posts: 427
Location: Montreal,Quebec
|
|
| Posted: Fri Oct 12, 2007 8:22 pm |
|
|
| Try delay_ms(100); before initializing the display |
|
|
PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
|
| Posted: Fri Oct 12, 2007 8:27 pm |
|
|
Make sure the Flex driver has these define statements in it.
Also make sure the line for USE_LCD_RW is commented out.
| Code: |
// These are the pin assignments used for the "Rohs"
// PicDem2-Plus:
#define LCD_DB4 PIN_D0
#define LCD_DB5 PIN_D1
#define LCD_DB6 PIN_D2
#define LCD_DB7 PIN_D3
#define LCD_E PIN_D6
#define LCD_RS PIN_D4
#define LCD_RW PIN_D5
// The following line must be commented out for
// the "Rohs" board.
// #define USE_LCD_RW 1
|
Use this as a test program. I assume you have a 10 MHz crystal.
Don't try to run the program in PLL mode at 40 MHz initially.
Try running it at 10 MHz. Also, after programming the PIC, remove
power from the board for a few seconds. The 18F452 must have
the power turned off and then on again, after programming, in order
to activate or de-activate the PLL mode.
| Code: |
#include <18F452.H>
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 10000000)
#define LCD_POWER PIN_D7
#include "Flex_LCD.c"
//============================
void main()
{
output_high(LCD_POWER); // Turn on power to LCD
output_low(LCD_RW); // Set R/W pin on LCD to a low level
lcd_init(); // Initialize the LCD
lcd_putc("\fHello World\n");
lcd_putc("Line Number 2");
while(1);
} |
|
|
|
Guest
|
|
| Posted: Sat Oct 13, 2007 1:56 am |
|
|
| PCM programmer wrote: |
Use this as a test program. I assume you have a 10 MHz crystal.
Don't try to run the program in PLL mode at 40 MHz initially.
Try running it at 10 MHz. Also, after programming the PIC, remove
power from the board for a few seconds. The 18F452 must have
the power turned off and then on again, after programming, in order
to activate or de-activate the PLL mode.
| Code: |
#include <18F452>
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 10000000)
#define LCD_POWER PIN_D7
#include "Flex_LCD.c"
//============================
void main()
{
output_high(LCD_POWER); // Turn on power to LCD
output_low(LCD_RW); // Set R/W pin on LCD to a low level
lcd_init(); // Initialize the LCD
lcd_putc("\fHello World\n");
lcd_putc("Line Number 2");
while(1);
} |
|
Thanks mate!! It works!!! Well sort of! Now I get
on the fist line, but on the second line I get
instead of just
Powering it down before running it makes no difference, and neither does adding a 100ms delay before initialising the display!
And my lcd.c file has the proper #define lines of code already (I had to change it before I would even get that "0ooo./....." on the LCD). |
|
|
H3rmaN
Joined: 12 Oct 2007
Posts: 5
|
|
| Posted: Sat Oct 13, 2007 2:05 am |
|
|
that was me that posted above! I just forgot to login!!
And Iv also just noticed that even if I comment out line 2 of the LCD, I still get that 'P' on screen! But the '@' goes away! |
|
|
PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
|
| Posted: Sat Oct 13, 2007 2:39 am |
|
|
1. Are you certain that you have a 10 MHz crystal on the board ?
2. Are you sure that you commented out the following line in the
Flex driver ? (Also make sure there isn't a duplicate line that
comes after it in the file)
| Code: | | // #define USE_LCD_RW 1 |
|
|
|
H3rmaN
Joined: 12 Oct 2007
Posts: 5
|
|
| Posted: Sat Oct 13, 2007 3:13 am |
|
|
1. no, im using a 4MHz crystal, but I changed the clock in the code you posted above from '10000000' (10MHz) to '4000000' (4MHz)
2. yes, that line is commented out, and I cant find any duplicate of it in any of the code.
This is the code im using:
Hello.c
| Code: | #include <18F452.H>
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#define LCD_POWER PIN_D7
#include "lcd.c"
//============================
void main()
{
output_high(LCD_POWER); // Turn on power to LCD
output_low(LCD_RW); // Set R/W pin on LCD to a low level
lcd_init(); // Initialize the LCD
lcd_putc("\fHello World\n");
lcd_putc("Line Number 2");
while(1);
} |
LCD.c (Flex_lcd.c)
http://www.ccsinfo.com/forum/viewtopic.php?t=24661
Thanks for all the help so far! |
|
|
PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
|
| Posted: Sat Oct 13, 2007 1:25 pm |
|
|
| Quote: | | I'm using MPLAB v7.50 and CCS PIC C Compiler 4.013 |
I believe that vs. 4.013 is causing the remaining problem.
See this thread. At the end of the first page, he says he upgraded to
a later version and the problem of "extra characters" was fixed:
http://www.ccsinfo.com/forum/viewtopic.php?t=31617 |
|
|
H3rmaN
Joined: 12 Oct 2007
Posts: 5
|
|
| Posted: Sat Oct 13, 2007 2:38 pm |
|
|
ok, cheers mate!
but the strange thing is it doesn't happen all the time!
Like right now I have it running a program to display room temp, and on the 1st line it shows my name, then on the 2nd line it show "Temp = 18C" or whatever temp it is!
And I have no problems with extra characters!
I also made a program to count up in the format "hh:mm:ss" (a bit like a digital clock)
And when its counting up I only see what I want to see on the LCD and no extra characters.... |
|
|
|
|
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
