I'm trying to adapt +Mark Kriegsman 16X16 Fireworks code from github to my 16X25

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I’m trying to adapt +Mark Kriegsman 16X16 Fireworks code from github to my 16X25 home grown matrix with limited success.

I’m using the 3.1 version of FastLED on an Arduino MEGA2560.
My matrix is built from 16 strips of 25 WS2812b each.
Each strip is connected to a separate pin on the MEGA.

I modified the original sketch to match my HW config and got the animation going with constants PIXEL_WIDTH 15 and PIXEL_HEIGHT 16.

I tried modifying to PIXEL_WIDTH 16 but the animation did not work anymore. The animation worked for PIXEL_WIDTH 16 if set PIXEL_HEIGHT 15. The animation also worked for PIXEL_HEIGHT 25 if I set PIXEL_WIDTH 10 !

Looks like the sketch limits the total size of the array to less than 256 or I’m hitting a memory limitation on the MEGA2560 !? My mediocre programming skills just can’t figure out how to modify the original sketch for a 16X25 array.
Any hints ?

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Check the type of the variable that you are using to index into the array. If it is byte, or char, or uint8_t then you need to change it to int, because otherwise it can only hold values from 0 to 255.

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You got it !!

But… as I couldn’t decide what to change exactly, I did a global replace of ‘byte’ to ‘int’ and DAMN it worked !!!

I need to get my head into arrays, pointers and indexes and build a better understanding. Where would you suggest I start ?

Thanks Daniel !!