Matrix M5.dis

johnwargo

I just purchased some M5 Atom Matrix devices and I want to start programming the LEDs. Where do I find documentation for the M5.dis API? The sample code does very little and I can't find any reference to M5.dis in the docs I've been able to find.

lukasmaximus

Hey are you programming in arduino or uiflow? you can check out these videos to get started

arduino
https://www.youtube.com/watch?v=2f4biAfvC_M

uiflow
https://www.youtube.com/watch?v=4dr5Y5ssQTk&t=201s

johnwargo

Thanks, but that doesn't answer my question. I'm looking at the sample apps and I see references to M5 methods, and M5.dis but I cannot find reference documentation for them anywhere.

Where are the reference docs for the M5 SDK? What are the methods, properties, etc. for the M5.dis object?

felmue

Hello John

Have you seen this? https://github.com/m5stack/M5Atom#display-api-document

Felix

johnwargo

@felmue Thanks, yes, I have - but that's not documentation for M5.dis object, that's documentation for some methods in a utility library that isn't even loaded by the M5 library.

led-matrix:14:10: error: 'class LED_Display' has no member named 'fillpix'

   M5.dis.fillpix(CRGB::Black);

          ^

exit status 1
'class LED_Display' has no member named 'fillpix'

I'm trying to figure out how to work with the matrix display on the Atom Matrix and I can't find any examples, end to end, that work. I found a reference to M5.dis but I'm just not seeing anything that references it or real examples of how to use it.

I tried using FastLED which is what the utility/LED_DisPlay.h code uses under the covers, even submitted some PRs today to tighten up that code, but as soon as I make any call to FastLED to update the display or show pixels, the sketch crashes.

world101

Not sure why, but the sketch was crashing for me as well, until I commented out the include M5Atom.h and m5.begin lines.

felmue

Hi John

The M5.dis object is defined in M5Atom.h as a member of M5Atom class:

class M5Atom
{
...
    LED_DisPlay dis;
...
}
extern M5Atom M5;

For the M5Atom examples to compile I had to add M5Atom and FastLED libraries to the project. (In PlatformIO I can simply drop the two libaries into the lib directory of the project. Not sure how that works with Arduino IDE, sorry.)

Felix

johnwargo

@felmue aaah, OK, I missed that when I looked at the source. Thanks.

I'm loading M5Atom.h and FastLED.h and its just not working for me.

stevesch

@johnwargo If anyone comes across this and is looking for functioning Arduino/PlatformIO code for the M5 Atom Matrix display, there's some on github here:
https://github.com/stevesch/atom-waves

robalstona

You can try neopixel library (probally from adafruit)