Trying to load sprites (hex array) into lcd screen from SD files

Projects Programming
1

hi folks!

im using a Sparkun serial lcd graphic display. I can print sprites on it doing something like this

byte mysprite[]={0x00,0x23,0xF1..........,0x00}

for(x = 0; x < length; x++) {
	MySerial.write(mysprite[x]);
}

at this point i found a little noisy sprite issues, i think they are related to the how i use pointers, not a big deal...

im using BMP2ASM to convert BMP sprites into hexadecimal arrays very well.

because i use a lot of sprites in my proyect, im using a arduino ethernet (not uno, not shield) they have a sd port to load the hex arrays from a sd card, i write this:

 int sprite_file="01.hex";

myspritefile= SD.open(sprite_file, FILE_READ);
if(myspritefile){
   while (myspritefile.available()){
      MySerial.write(myspritefile.read());
    }
   disco.close();
}

and to create the 00.hex files i write a little php code that write files in hex for me

<?php

$hex_sprite="0x00,0x00,0x00,0x00,0x00,0x00";

ASM2HEX("00.hex",$hex[0]);

function ASM2HEX($file,$data){
	$ascii=explode(",",$data);
	foreach ($ascii as $pos => $val){
		$exploited=explode("x", $val);
		$ascii[$pos]=$exploited[1];
		$hexa.=$exploited[1];
	}
	$file_put=file_put_contents($file,pack("H*",$hexa));
}

?>

basically, ASM2HEX function explodes the string into a array, and convert each item from this 0xXX into this XX, and write all array in hexa bytes into file. I checked the result in hexa editor and the values are the same of the original sprite.

But, when i test the example i get crap on my lcd screen!

i think i dont have the knowledge for do this for my own, i want some help here :slight_smile:

2

Hi, I don't know how to solve you problem, but the first thing I'd do is send the file contents to the serial monitor.
For example, substitute this line:

MySerial.write(myspritefile.read());

with this:

Serial.print(myspritefile.read(), HEX);

(I suppose MySerial is an instante of the software serial class.)
I think if you do this with a small file, you can easily compare the bytes written by the php script with those that appear on the serial monitor.

HTH

3

at this point i found a little noisy sprite issues, i think they are related to the how i use pointers, not a big deal...

And where are you using pointers? No where in the snippets you posted.