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myloudharim
Joined: 13 Nov 2017
Posts: 10
Location: philly
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| LCD2x16 Custom Character does not work |
 Posted: Sat Dec 19, 2020 9:15 pm |
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Hello everyone, i wanna try replicate and display custom character on a 2x16 lcd. I inspired from some examples shared by members of view topic
but without success, all of examples i saw are not working. Anybody knows why, do i have any mistake on my code?
I include LCD.c
EN --->RD0
RS --->RD1
RW--->RD2
D0 : D3 --->GND
D4 --->RD4
D5---->RD5
D6---->RD6
D7---->RD7
here is my code
| Code: |
#include "W:\CCS Projects\16f877_LCD_2x16.h"
#include <lcd.c>
//-----------------------------------------------------------
const int8 lcd_custom_chars[] =
{
// Char Number 1 -- Degrees
0b00001100, // ....OO..
0b00010010, // ...O..O.
0b00010010, // ...O..O.
0b00001100, // ....OO..
0b00000000, // ........
0b00000000, // ........
0b00000000, // ........
0b00000000, // ........
};
void lcd_load_custom_chars(void)
{
int8 i;
lcd_send_byte(0, 0x40); // Set address counter pointing to CGRAM address 0.
// Load custom lcd character data into CGRAM.
// It can only hold a maximum of 8 custom characters.
for(i = 0; i < 8; i++)
{
lcd_send_byte(1, lcd_custom_chars[i]);
}
// Set address counter pointing back to the DDRAM.
lcd_send_byte(0, 0x80);
}
//-----------------------------------------------------------
void main(){
lcd_init();
lcd_gotoxy(1,1);
lcd_load_custom_chars();
} |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19520
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| Posted: Sun Dec 20, 2020 2:15 am |
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OK. You have loaded a custom character, but you don't show where
you ask the display to show this. Your new character is character 0. Now to
send 0 to the display, you have to use a hex or octal escape, to output this.
So, something like:
| Code: |
//load your character, then
printf(lcd_putc,"\FCustom = \000");
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Sends the 000 character to be displayed.
As a comment, I'd suggest you add a little delay before you initialise the
display at the start of your code. A lot of LCD's need a bit more time than
the PIC to wake up... |
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benoitstjean
Joined: 30 Oct 2007
Posts: 566
Location: Ottawa, Ontario, Canada
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| Posted: Tue Dec 22, 2020 8:38 am |
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Here's code I used many years ago which is probably the same as yours based on what I see...
Question: Can you display anything on the LCD? Can you display "Hello"? When/if that works, the go to the next step of creating custom characters...
| Code: |
//************************************
In your .h file:
//************************************
#define LEFT_ARROW 0
#define RIGHT_ARROW 1
#define YOUR_NEXT_CHAR1 2
#define YOUR_NEXT_CHAR2 3
... and so on up to 7 (0-8)...
const int8 lcd_custom_chars[] =
{
// Char 0 -- Left arrow
0b00000001, // ---....O
0b00000011, // ---...OO
0b00000101, // ---..O.O
0b00001001, // ---.O..O
0b00000101, // ---..O.O
0b00000011, // ---...OO
0b00000001, // ---....O
0b00000000, // --------
// Char 1 -- Right arrow
0b00010000, // ---O....
0b00011000, // ---OO...
0b00010100, // ---O.O..
0b00010010, // ---O..O.
0b00010100, // ---O.O..
0b00011000, // ---OO...
0b00010000, // ---O....
0b00000000, // --------
// Char 2 -- YOUR_NEXT_CHAR1
... put bit pattern here
// Char 3 -- YOUR_NEXT_CHAR2
... put bit pattern here
// add more here following the pattern above...
}
void lcd_LoadCustomChars( void );
//************************************
In your .c file:
//************************************
main()
{
// Whatever code
lcd_init();
lcd_LoadCustomChars();
// Whatever code
// When you want to use it:
lcd_gotoxy( 1, 1 );
lcd_putc( LEFT_ARROW );
lcd_gotoxy( 5, 1 );
lcd_putc( RIGHT_ARROW );
lcd_gotoxy( 10, 1 );
lcd_putc( YOUR_NEXT_CHAR1 );
lcd_gotoxy( 15, 1 );
lcd_putc( YOUR_NEXT_CHAR2 );
// Whatever code
}
//---------------------------------------
// lcd_LoadCustomChars
//
// Load custom characters in LCD CGRAM.
//
//---------------------------------------
void lcd_LoadCustomChars( void )
{
int8 i;
// Set address counter pointing to CGRAM address 0.
lcd_send_byte( 0, 0x40 );
// Load custom lcd character data into CGRAM.
// It can only hold a maximum of 8 custom characters.
for(i = 0; i < sizeof( lcd_custom_chars ); i++)
{
lcd_send_byte( 1, lcd_custom_chars[i] );
}
// Set address counter pointing back to the DDRAM.
lcd_send_byte(0, 0x80);
}
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I think that's pretty much it. This was for the <EA DIP204-4NLED> LCD display but they're pretty much all the same based-off the HD44780.
Ben |
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