 |
 |
| View previous topic :: View next topic |
| Author |
Message |
artohautala
Joined: 17 Nov 2011
Posts: 187
|
| call your own marks using GCRAM 2x16 LCD with PIC? [SOLVED] |
 Posted: Thu Jun 16, 2016 6:30 am |
 |
|
Hello ,
so I have PIC16F877A controlling 2x16 text LCD display ...
everything works fine I can write to it ... ok normal text...
but when I do my own mark to GCRAM I don't understand how I can call it
to show maybe line 0 character 0 ...
upper line characters are address 0 ... 0x15
and lower line 0x40 ... 0x4F
I made this pattern:
//pattern 5 x 8
// 0B000 00000
// 0B000 00000
// 0B000 11111 (= 31)
// 0B000 11111
// 0B000 11111
// 0B000 11111
// 0B000 00000
// 0B000 00000
my question is how I can use it and call it to LCD display into
some position ?
I don't understand that procedure how to make your own marks
and call them to some place in LCD display.
I'll be very pleased if someone can help me !
best of all to he all !
arto
from finland
Last edited by artohautala on Mon Jun 20, 2016 4:55 am; edited 1 time in total |
|
 |
RF_Developer
Joined: 07 Feb 2011
Posts: 839
|
|
| Posted: Thu Jun 16, 2016 7:07 am |
|
|
| There are many different displays, some may do it, some may not. Do you know for certain that your display supports that? If so, then the datasheet will tell you how to do it. |
|
|
temtronic
Joined: 01 Jul 2010
Posts: 9243
Location: Greensville,Ontario
|
|
| Posted: Thu Jun 16, 2016 7:25 am |
|
|
| Code: |
//custom characters
//0=off, 1=on
const int8 lcd_custom_chars[] =
{
0b00000000,
0b00000000,
0b00000000,
0b00000001,
0b00000011,
0b00000111,
0b00001111,
0b00011111,
0b00000000,
0b00000000,
0b00000000,
0b00010000,
0b00011000,
0b00011100,
0b00011110,
0b00011111,
0b00011111,
0b00001111,
0b00000111,
0b00000011,
0b00000001,
0b00000000,
0b00000000,
0b00000000,
0b00011111,
0b00011110,
0b00011100,
0b00011000,
0b00010000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
};
void lcd_load_custom_chars(void)
{
int8 i;
// Set address counter pointing to CGRAM address 0.
lcd_send_byte(0, 0x40);
// Load custom lcd character data into CGRAM.
// 8 characters x 8 bytes = 64 bytes total
for(i = 0; i <=63; i++)
{
lcd_send_byte(1, lcd_custom_chars[i]);
}
// Set address counter pointing back to the DDRAM.
lcd_send_byte(0, 0x80);
} |
The above code 'snippet' is what I've used to load 8 custom characters into a 4 by 20 LCD module. Most 'LCD units' allow up to 8 user defined characters. In my case the 8 are 'segments' used to make large characters on the 4by20 display
now this...
| Code: |
void jay3() //4 row high #3
{
lcd_gotoxy(x_pos_state+0,1);
lcd_putc(0);
lcd_putc(5);
lcd_putc(5);
lcd_putc(1);
lcd_gotoxy(x_pos_state+0,2);
lcd_putc(7);
lcd_putc(7);
lcd_putc(4);
lcd_putc(3);
lcd_gotoxy(x_pos_state+0,3);
lcd_putc(7);
lcd_putc(7);
lcd_putc(5);
lcd_putc(1);
lcd_gotoxy(x_pos_state+0,4);
lcd_putc(2);
lcd_putc(4);
lcd_putc(4);
lcd_putc(3);
}
|
is used to display a BIG '3' on the LCD.
the line
lcd_putc(3);
tells the LCD to display the 'custom character' stored in LCD memory location number 3. Just remember they are from 0 to 7 !
It helps to use binary for the character 'map' as the '1's and '0's show you what the custom character should look like.
Jay
PM me if you want the 'driver'.It might help you understand what's going on. |
|
|
artohautala
Joined: 17 Nov 2011
Posts: 187
|
|
| Posted: Thu Jun 16, 2016 7:46 am |
|
|
| temtronic wrote: | | Code: |
//custom characters
//0=off, 1=on
const int8 lcd_custom_chars[] =
{
0b00000000,
0b00000000,
0b00000000,
0b00000001,
0b00000011,
0b00000111,
0b00001111,
0b00011111,
0b00000000,
0b00000000,
0b00000000,
0b00010000,
0b00011000,
0b00011100,
0b00011110,
0b00011111,
0b00011111,
0b00001111,
0b00000111,
0b00000011,
0b00000001,
0b00000000,
0b00000000,
0b00000000,
0b00011111,
0b00011110,
0b00011100,
0b00011000,
0b00010000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
};
void lcd_load_custom_chars(void)
{
int8 i;
// Set address counter pointing to CGRAM address 0.
lcd_send_byte(0, 0x40);
// Load custom lcd character data into CGRAM.
// 8 characters x 8 bytes = 64 bytes total
for(i = 0; i <=63; i++)
{
lcd_send_byte(1, lcd_custom_chars[i]);
}
// Set address counter pointing back to the DDRAM.
lcd_send_byte(0, 0x80);
} |
The above code 'snippet' is what I've used to load 8 custom characters into a 4 by 20 LCD module. Most 'LCD units' allow up to 8 user defined characters. In my case the 8 are 'segments' used to make large characters on the 4by20 display
now this...
| Code: |
void jay3() //4 row high #3
{
lcd_gotoxy(x_pos_state+0,1);
lcd_putc(0);
lcd_putc(5);
lcd_putc(5);
lcd_putc(1);
lcd_gotoxy(x_pos_state+0,2);
lcd_putc(7);
lcd_putc(7);
lcd_putc(4);
lcd_putc(3);
lcd_gotoxy(x_pos_state+0,3);
lcd_putc(7);
lcd_putc(7);
lcd_putc(5);
lcd_putc(1);
lcd_gotoxy(x_pos_state+0,4);
lcd_putc(2);
lcd_putc(4);
lcd_putc(4);
lcd_putc(3);
}
|
is used to display a BIG '3' on the LCD.
the line
lcd_putc(3);
tells the LCD to display the 'custom character' stored in LCD memory location number 3. Just remember they are from 0 to 7 !
It helps to use binary for the character 'map' as the '1's and '0's show you what the custom character should look like.
Jay
PM me if you want the 'driver'.It might help you understand what's going on. |
OK so I understand there is custom characters 0...7
and they are loaded 0...63 CGRAM to those addressis...
<PM me if you want the 'driver'.It might help you understand what's going on>
that would help ...
but I do not understand how to call my customized characters into LCD
example row 0 character 0 ... ?
thank for your patience and good advice ...
-arto- |
|
|
temtronic
Joined: 01 Jul 2010
Posts: 9243
Location: Greensville,Ontario
|
|
| Posted: Thu Jun 16, 2016 7:54 am |
|
|
...
lcd_goto(1,1);
lcd_putc(3);
...
Will display the 3rd 'custom character' at the LCD screen positon of line 1, first position.
Jay |
|
|
artohautala
Joined: 17 Nov 2011
Posts: 187
|
|
| Posted: Thu Jun 16, 2016 8:37 am |
|
|
| temtronic wrote: | ...
lcd_goto(1,1);
lcd_putc(3);
...
Will display the 3rd 'custom character' at the LCD screen positon of line 1, first position.
Jay |
Thank's for your answer ...
is it so that I have to write my custom marks to memory 0 ...to 7
and then read my custom marks and then send them to memory 0x40
if first line first character ?
sorry my missing brains ...
-arto- |
|
|
temtronic
Joined: 01 Jul 2010
Posts: 9243
Location: Greensville,Ontario
|
|
| Posted: Thu Jun 16, 2016 8:43 am |
|
|
yes...
just start with a simple program,
maybe copy/paste my code 'chunks' into a small program( you'll need the
LCD driver of course though you must have that working..
small steps.... and then the 'light' will come on !!
Jay |
|
|
artohautala
Joined: 17 Nov 2011
Posts: 187
|
|
| Posted: Thu Jun 16, 2016 9:10 am |
|
|
| temtronic wrote: | yes...
just start with a simple program,
maybe copy/paste my code 'chunks' into a small program( you'll need the
LCD driver of course though you must have that working..
small steps.... and then the 'light' will come on !!
Jay |
Thank you so much ... I can write strings to my LCD dislay very well ...
(I have 4 bits connection ... to my LCD display... it works well)
So I have to store my custom pattern to LCD memory locations 0... 7
and then read my custom pattern and send it to location 0x40 if I want it
to see in location row 0 character 0 in my LCD
< small steps.... and then the 'light' will come on !!>
this is very good advice to do
YEAH
all the best for you
-arto- |
|
|
artohautala
Joined: 17 Nov 2011
Posts: 187
|
|
| Posted: Sun Jun 19, 2016 9:48 am |
|
|
| temtronic wrote: | yes...
just start with a simple program,
maybe copy/paste my code 'chunks' into a small program( you'll need the
LCD driver of course though you must have that working..
small steps.... and then the 'light' will come on !!
Jay |
HI,
I have tried everything but still I don't understand how it works ...
I can not call those custom characters ... right way ... when I call them there's
mismatchs in LCD display ... and I do not know how to call my custom characters...
| Code: |
const int8 lcd_custom_chars[] =
{
//this balk
0b00000000,
0b00000000,
0B00011111,
0B00011111,
0B00011111,
0B00011111,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00010000,
0b00011000,
0b00011100,
0b00011110,
0b00011111,
0b00011111,
0b00001111,
0b00000111,
0b00000011,
0b00000001,
0b00000000,
0b00000000,
0b00000000,
0b00011111,
0b00011110,
0b00011100,
0b00011000,
0b00010000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00011111,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
0b00000000,
};
int8 i;
// Load custom lcd character data into CGRAM.
// 8 characters x 8 bytes = 64 bytes total
//data write, cursor auto increment:// Set address counter pointing to CGRAM address 0:
output_low(RS);
PORTD = 0B10000000; //MSB first
enable_lcd();
PORTD = 0B00000000;
enable_lcd();
output_high(RS);
for(i = 0; i <=63; i++){
//lcd_send_byte(1, lcd_custom_chars[i]);
PORTD = lcd_custom_chars[i]; //MSB first
enable_lcd();
PORTD = lcd_custom_chars[i] <<=4 ; //then LSB
enable_lcd();
}
// Set address counter pointing back to the DDRAM address 0B10000000:
output_low(RS);
PORTD = 0B10000000; //MSB first
enable_lcd();
PORTD = 0B00000000;
enable_lcd();
}
|
So I copy/paste this but I do not know how TO CALL it right way ...
My functions show_mark() and show_text() works OK ... in LCD screen ...
But I don't understand how I can call my custom characters to right place in LCD ?
pls help me !
-arto- |
|
|
PCM programmer
Joined: 06 Sep 2003
Posts: 21708
|
|
|
Ttelmah
Joined: 11 Mar 2010
Posts: 19539
|
|
| Posted: Sun Jun 19, 2016 11:39 am |
|
|
and, understand the custom characters are just another character, so you position then with lcd_goto, just as for any other character.  |
|
|
artohautala
Joined: 17 Nov 2011
Posts: 187
|
|
| Posted: Mon Jun 20, 2016 4:49 am |
|
|
| Ttelmah wrote: | | and, understand the custom characters are just another character, so you position then with lcd_goto, just as for any other character. |
HI,
problem SOLVED! now it works fine !
Thank you very much for your good advice and patience
all the best !
-arto- |
|
|
artohautala
Joined: 17 Nov 2011
Posts: 187
|
|
| Posted: Mon Jun 20, 2016 4:50 am |
|
|
HI,
problem SOLVED! now it works fine !
Thank you very much for your good advice and patience
all the best !
-arto- |
|
|
artohautala
Joined: 17 Nov 2011
Posts: 187
|
|
| Posted: Mon Jun 20, 2016 4:52 am |
|
|
| temtronic wrote: | yes...
just start with a simple program,
maybe copy/paste my code 'chunks' into a small program( you'll need the
LCD driver of course though you must have that working..
small steps.... and then the 'light' will come on !!
Jay |
HI,
problem SOLVED! now it works fine !
Thank you very much for your good advice and patience
all the best !
-arto- |
|
|
|
|
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
