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armma
Joined: 30 Apr 2016
Posts: 7
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| custom character number 8 not display on lcd |
 Posted: Sun Sep 02, 2018 4:34 am |
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Hi,
I'm trying to display custom characters on 2 by 16 lcd.
I wrote a code to display 8 custom characters. All characters displayed on the lcd except char #8.
| Code: |
#include <18f4520.h>
#device *= 16
#fuses NOWDT, HS, PROTECT, CPD, NOWRT, BROWNOUT, NODEBUG, NOLVP, PUT
#use delay (clock = 4MHz)
#include "lcd.c"
#define DEGREES 0
#define THERMO1 1
#define THERMO2 2
#define BELL_ACTIVE 3
#define MENU_R 4
#define MENU_L 5
#define CANCEL 6
#define OK 7
//!
void lcd_load_custom_chars(void);
void main()
{
lcd_init();
DELAY_MS(500);
lcd_load_custom_chars();
lcd_putc('\f');lcd_putc(DEGREES);lcd_putc(THERMO1); lcd_putc(THERMO2); lcd_putc(BELL_ACTIVE);lcd_putc(CANCEL);lcd_putc(OK);LCD_GOTOXY(1,2);lcd_putc(MENU_L);LCD_GOTOXY(16,2);lcd_putc(MENU_R);
while(TRUE)
{
}
}
const int8 lcd_custom_chars[] =
{
// Char Number 1 -- Degrees
0b00001100, // ....OO..
0b00010010, // ...O..O.
0b00010010, // ...O..O.
0b00001100, // ....OO..
0b00000000, // ........
0b00000000, // ........
0b00000000, // ........
0b00000000, // ........
// Char Number 2 -- thermo1
0B00100,
0B01010,
0B01010,
0B01110,
0B01110,
0B11111,
0B11111,
0B01110,
// Char Number 3 -- thermo2
0B00100,
0B01010,
0B01010,
0B01010,
0B01010,
0B10001,
0B10001,
0B01110,
//bell active
4,14,14,14,31,0,4,0,
//menu right
0B10000,
0B11000,
0B11100,
0B11110,
0B11100,
0B11000,
0B10000,
0B00000,
//menu left
0B00001,
0B00011,
0B00111,
0B01111,
0B00111,
0B00011,
0B00001,
0B00000,
//cancel
0B00000,
0B10001,
0B01010,
0B00100,
0B01010,
0B10001,
0B00000,
0B00000,
//character number 7 ... ok
0B00000,
0B00001,
0B00011,
0B10110,
0B11100,
0B01000,
0B00000,
0B00000,
};
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.
// 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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Ttelmah
Joined: 11 Mar 2010
Posts: 19553
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| Posted: Sun Sep 02, 2018 8:51 am |
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The reason is simple. You can't send the 07 character with the standard lcd_putc. This is the ASCII '\a' character which is trapped by the driver. Add 8, and use 0xF for the character 7 (the CGRAM characters appear at 0 to 7, and then repeated at 8 to 15). 
Or use flex_lcd, which does not trap the \a character. |
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armma
Joined: 30 Apr 2016
Posts: 7
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| Posted: Tue Sep 04, 2018 4:59 pm |
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| Ttelmah wrote: | The reason is simple. You can't send the 07 character with the standard lcd_putc. This is the ASCII '\a' character which is trapped by the driver. Add 8, and use 0xF for the character 7 (the CGRAM characters appear at 0 to 7, and then repeated at 8 to 15).
Or use flex_lcd, which does not trap the \a character. |
thank you  |
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E_Blue
Joined: 13 Apr 2011
Posts: 417
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| Posted: Wed Sep 05, 2018 8:26 am |
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| Ttelmah wrote: | The reason is simple. You can't send the 07 character with the standard lcd_putc. This is the ASCII '\a' character which is trapped by the driver. Add 8, and use 0xF for the character 7 (the CGRAM characters appear at 0 to 7, and then repeated at 8 to 15).
Or use flex_lcd, which does not trap the \a character. |
There's any table that shows the byte value of each of those special codes \a \f \n etc?
I know \r\n and that's all.
_________________
Electric Blue |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19553
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| Posted: Wed Sep 05, 2018 9:06 am |
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The power of Wikipedia:
<https://en.wikipedia.org/wiki/Escape_sequences_in_C>
You'll see that the /a sequence was only added in C89. Didn't exist in original K&R.
It's actually treated as a 'back to origin' code in the CCS driver. Think I prefer flex_lcd, which just ignores it... |
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temtronic
Joined: 01 Jul 2010
Posts: 9246
Location: Greensville,Ontario
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| Posted: Wed Sep 05, 2018 10:36 am |
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It's too bad CCS used \a for their 'home' code.
\a is supposed to be 'alert' or bell.....
sigh.
I just checked the link and \h is NOT defined so it could have been used as the 'home' code ( top left position). That would make logical sense to me.... |
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