PROGMEM LCD custom chars and memcpy_P()

Projects Programming
1

Hello !!

I'm confused, I show you my code, running on Arduino MEGA and LCD 16x2.

This is my custom charset, a total of 19 characters of 8 bytes each

const byte CCFlash[19][8] PROGMEM = {
 {B10000, B10000, B10000, B10000, B10000, B10000, B10000, B10000}, // 1/5 full block, 
 {B11000, B11000, B11000, B11000, B11000, B11000, B11000, B11000}, // 2/5 full block
 {B11100, B11100, B11100, B11100, B11100, B11100, B11100, B11100}, // 3/5 full block
 {B11110, B11110, B11110, B11110, B11110, B11110, B11110, B11110}, // 4/5 full block 
 {B11111, B11111, B11111, B11111, B11111, B11111, B11111, B11111}, // 5/5 full block
 {B01100, B10010, B10010, B01100, B00000, B00000, B00000, B00000}, // Grado 
 {B00100, B01110, B01110, B01110, B11111, B00000, B00100, B00000}, // Bell
 {B00010, B00011, B00010, B01110, B11110, B01100, B00000, B00000}, // Note
 {B00000, B01010, B11111, B11111, B01110, B00100, B00000, B00000}, // Heart
 {B00000, B00000, B01010, B00000, B00000, B10001, B01110, B00000}, // Smile
 {B00000, B00000, B01010, B00000, B00000, B00000, B01110, B10001}, // Frownie
 {B00100, B01010, B00100, B00100, B01110, B10101, B00100, B01010}, // Armsdown
 {B00100, B01010, B00100, B10101, B01110, B00100, B00100, B01010}, // Aarmsup
 {B11111, B10101, B11111, B11111, B01110, B01010, B11011, B00000}, // Alien
 {B00000, B00001, B00011, B10110, B11100, B01000, B00000, B00000}, // Check
 {B00001, B00011, B01111, B01111, B01111, B00011, B00001, B00000}, // Speaker
 {B00001, B00011, B00101, B01001, B01001, B01011, B11011, B11000}, // Sound
 {B00000, B01110, B10101, B11011, B01110, B01110, B00000, B00000}, // Skull
 {B01110, B10001, B10001, B11111, B11011, B11011, B11111, B00000}, // Lock
};

and this is the procedure to create the characters

void createCustomChars_P()
{
 byte i;
 byte CCRam[8];
 
 #define MaxCC 19
 for (i = 0 ; i < MaxCC ; i++)
   {
     memcpy_P(CCRam, &CCFlash[i][0], 8);
      lcd.createChar(i, CCRam);
 
   }
}

If I use #define MaxCC 8 it works fine, but obvious only 8 characters.

by example

lcd.setCursor(1, 0);
lcd.write(byte(0));  //print  1/5 full block on lcd

but

If #define MaxCC 19 (all chars, original code) don't create characters in correct position, and when

lcd.setCursor(1, 0);
lcd.write(byte(0));

print another character on LCD.
Any suggestions would be welcome !
Thanks

2

You can define only 8 different custom chars at the same time.

3

Which LCD display are you using? The common displays with an HD44780 or compatible controller chip only have enough memory in the controller for 8 custom characters. The custom characters can be redefined at any time, so you can have as many as you want, but only 8 can be in use at any given time, and redefining a custom character that is currently being displayed will alter the actual display.

4

Thanks a lot !