@fonix232 I've now 'successfully' used a 128GB SD Card (SanDisk Ultra) formatted as FAT32 with the M5Paper.
I haven't tried writing files using the M5Paper, but I can read text files and jpg files using the factorytest without any problems.

@mwenghi I've worked out that set_checked does actually work. It changes the internal state of the checkbox from unchecked to checked, but it's not changing the visible state of the checkbox on the screen, so it doesn't appear to do anything!

If you add a set_checked_color call (in blockly it's the block set selectedColor) after your set_checked it will then show the relevant checkbox as checked in your desired color.

I would like to be able to buy a Core or Core2 without any base or battery attached.

After buying some m5go, node and faces bottoms I already have more bases than cores. If I buy more cores I will get more bases and batteries that I do not need and they just lie around not being used.

If you sell only the top part of Core or Core2 with the main board and display, we could check the pin compatibility and match them with already purchased battery bases.

@kevindtimm I'm glad you've got the SD card working.
You actually have all the low-level.M5Paper hardware information closer than you think. On the back of all cores there's a colourful sticker. It's not just a pretty diagram. It's got just about all of the hardware details that you might need. If you look carefully at the list of pins for the SD card you'll find CS on pin 4!

@lukasmaximus I'd like to know why all the M5Stack cores (and the Atom TF card) show 16GB as the maximum SD card size. The ATOM GPS Development Kit doesn't show any details for the TF/SD max card size at all, probably 16GB!
I did some research on the net, and I think cards formatted to FAT32 at least up to 32GB 'should' be ok.
I vaguely remember a m5stack post about one of the camera boards where there was a table of compatible and incompatible sd cards. I didn't really understand why some of them worked or didn't work, perhaps transfer speed for video data?
Actually it was here on the here and that's not an ESP32.
Perhaps 16GB is listed as the 'maximum' as this will definately work? Anything above that might have some issues, so 16GB should be the safe option.
Depending on the hardware in the cores, it might be an issue with the SPI SD card slot controller, I'm not sure.
I've 'successfully' tested a 64GB card before, reformatted to FAT32 and not exfat.
(I also used 64GB cards formatted like that for a couple of my raspberry pi boards.)
But I've never tried storing more than a few gigabytes on any system anyway. Even if you were logging data like crazy for a long time, what would you really do with it all?
FAT32 isn't limited to 32GB, it'll work up to 2TB with single files max. 4GB. Exfat is the factory default above 32GB because it's more suited to larger capacity cards and the SD card controller has to understand exfat format (I think?).
Can anyone else confirm any of the above as working and good information?
Sorry if any of it turns out to be rubbish!

@kevindtimm Up to 16GB should work. I don't know why there is a relatively low SD card limit in the M5Stack hardware (all models). It might be a limit with the ESP32 itself, but I don't know.
My SD card is a 16GB SanDisk Ultra. It was a random selection from my 16GB cards.

@powersoft I got the M5EPD_TTF example running using the GenSenRounded-R.ttf file copied to my SD card. It displays some differently sized flowers, some unicode math symbols and left/right arrows to show top-left down to bottom-right labels.
I removed all the addtional example code to just read the font from the SD card, so the setup starts like this:

void setup()
{
    M5.begin();
    M5.TP.SetRotation(90);
    M5.EPD.SetRotation(90);
    M5.EPD.Clear(true);

    canvas1.loadFont("/GenSenRounded-R.ttf", SD); // Load font files from SD Card
    canvas1.createCanvas(540, 960);
    canvas1.createRender(48, 256);
    ...

I just tried one of my SD cards in my M5Paper, using the factory test firmware from M5Burner. Everything works without any problems.
I copied over a couple of text files in different folders, a jpg and a mp3 (just for the sake of it).
The files in the folders were shown correctly, with all the correct details.
I could also open the text files and jpg by tapping on them to see the text and the picture. It doesn't recognise mp3 files to open them, but it reads the file size correctly.
Don't misunderstand this but, you have plugged the SD card in properly? It is upside down, the pins are facing upwards when you insert it. It is fully inserted so it clicks into place. It needs to be pushed right inside with your fingernail, otherwise it's not really in. Sorry if that's blatantly obvious, but you never know.

@world101 You can just use the files in the ESP32-A2DP project as a start.
I didn't change anything in the arduino library, I just had to change the name of the speaker (obviously) in the bt_music_sender_write example. There's an error in that sample project at the moment as StarWars10 is defined, but the data is actually called StarWars30, just rename it and it should compile.
I had the problem that the original sample played at double speed! I've followed the instructions to create new samples in audacity and export/convert them. Make sure to exactly create 44100 stereo 16-bit PCM data files, convert with xxd and then use TwoChannelSoundData so it plays at the correct speed.

I've got a problem with M5Burner 2.2.7 on my Ubuntu mate system running on a hp laptop. The M5Burner window is too large for the display.

I can move/scroll it around to find all of the buttons and systems, but it is really annoying. I actually have to move the window using the to see the erase button and the 'X' close button! The maximise window button doesn't do anything at all, I can only minimise the window.

My full laptop display resolution is 1366 x 768 which might be non-standard but it doesn't seem too small.

Is the M5Burner display resolution fixed?

Is there any way that I can change some configuration settings for M5burner so that everything fits more comfortably on my display?