Subcategories

• ESPHome

  You can discuss ESPHome related issues here, share your yaml and projects.

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  I am trying to run a fully-loaded ESPHome node on an M5Stack Core Basic (ESP32-D0WDQ6-V3). My goal is to use it as a Bluetooth Proxy while also using the internal screen to display sensor data.

  The device boots, connects to WiFi, and the Bluetooth Proxy works perfectly. However, the display refuses to initialize. The backlight stays on, but the screen remains white (no pixels).

  The logs show a clear memory allocation failure:

  [E][display:017]: Could not allocate buffer for display! [E][component:119]: Component display was marked as failed.

  I suspect I am hitting a hard hardware ceiling because this board lacks PSRAM (it only has ~320KB internal RAM). It seems like the combination of these three components exceeds the available memory:

  WiFi/API: Baseline load. Bluetooth Proxy: Reserves a massive contiguous block. Display (320x240): The ili9xxx driver seems to need ~153KB for the frame buffer. Since the display initializes last, it finds zero contiguous RAM left and fails.

  To test this theory, I crippled the display configuration to use less memory. By setting dimensions: 320x60, I forced the buffer size down to ~38KB.

  This immediately fixed the crash. The device booted, the text appeared (in the top 60px strip), and Bluetooth continued working.

  Is this a known hardware limitation of the M5Stack Basic? Has anyone managed to run a Bluetooth Proxy AND a Full Resolution (320x240) Display on an ESP32 without PSRAM?

  I am wondering if there is a way to optimize the Bluetooth stack size or the display buffer (maybe partial updates?) to make them fit, or if I am simply asking for too much from this hardware.

• Squareline Studio / LVGL

  Squareline Studio and LVGL Discussion

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  @俺がガンダムだ said in LVGL performance problem:

  I applied LVGL on stickc-plus2，with TFT_eSPI's st7789v2 driver.But the refreshing rate is very low (while doing "load screen anim").I know stickc had good performance on drawing screen (by watching the video of M5stick T-Lite Thermal tutorial). And the LVGL also has a good performance through Dial-ESP32-S3 and Din-Meter demonstration video.

  So what is the reason of such low performance. Cound it be the TFT_eSPI library?

  I’ve seen similar issues on the StickC-Plus2. It could be due to TFT_eSPI settings, try increasing the SPI frequency or enabling DMA. Also, check your LVGL buffer config; full buffering helps with performance.

• UIFlow

  Discuss all things UIFlow here. Bugs, Improvements, Guides etc...

  Lessons and Guides Bug Report Custom Blocks
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  E

  Hello everyone,
  I’m facing a problem that I haven’t been able to solve.
  I have connected four servo motors to pins G19, G25, G26, and G27 of the Core2, and using UIFlow1 I can correctly control the servos’ movements.

  Now, I need to establish USB communication between my PC and the Core2. Essentially, I would like to run a Python script on my PC that sends an angle to the Core2 so it can command the motors to reach that desired value. I want to understand whether the USB cable connecting the Core2 to the PC is sufficient (I’ve asked on chat.m5stack.com and it should be possible according to AI response).

  I’ve tried many approaches, all unsuccessful. Here are the two main ones:

  Attempt 1: In UIFlow1 I used the Hardware -> UART blocks, defining both uart1 = machine.UART(1, tx=32, rx=33) and uart2 = machine.UART(2, tx=17, rx=16). In both cases, I cannot read anything (uart1.any() / uart2.any() return nothing).

  Attempt 2: I flashed the UIFlow2 firmware, but I cannot find blocks for serial communication.

  It seems I could also bypass UIFlow entirely and program everything in VS Code using the Python and Pymakr extensions, but I would like to know if this is the only way before going that way.

  Thanks a lot for your support!
  Eleonora

• Arduino

  M5Stack is programmable with the Arduino IDE. Here you can troubleshoot your issues and share Arduino code and libraries

  Lessons and Guides
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  Apparently M5.Display.powerSaveOn() reduces the RGB color space to just a few base colors, I suppose to save PSRAM bandwith and power. As a result all your colors are way off when powersave is on.

• Micropython

  Discuss all things Micropython here. Get help, Recommend Libraries, Report Bugs and Improvements

  Lessons and Guides
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  I'm building a MicroPython app on the UIFlow 2.3.6 os for a CoreS3.
  The new m5ui LVGL widgets are wonderful, eg List, Dropdown, that are populated with touch buttons to make the selection. If there are more options than fit in the visible list a scroll bar appears and the list can be dragged. But this is made unusable by the scrolling speed .. I believe due to the animation speed.

  When I load 15 to 20 unattached strings (like with Blockly) the scroll speed is passable at first, but seems to get slower over time. The animation becomes painfully intrusive, until it is taking several seconds to ripple to a halt. I am deep copying the strings to the list, so there's no linkage or processing drag.

  Is there any way to change the animation speed, or turn it off? Or any other workaround suggestions?

  Thanks so much for any advice or suggestions.

• M5EZ

  For discussion and assistance with M5EZ.

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  using the mentioned changes hello_world example did compile and got uploaded to my core2. However , nothing is shown on screen, screen remains black.

• ESP - IDF

  Discuss all things related to ESP - IDF, Espressifs IoT Development Framework

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  Hello @RubberDuck

  I can confirm the shark fin like signals on my M5CoreS3. I am no I2C expert, but I think they might be marginal and so maybe just barely working on one M5CoreS3 but not on the other when talking to AXP2101. Maybe a stronger pull-up resistor might help?

  BTW: I checked the I2C SCL line on an M5Core2 and it is much more rectangular, e.g. much more like I would expect it.

  Thanks
  Felix

• UiFlow 2.0

  UiFlow 2.0 related issues discussion.

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  Hello @ProfHuster

  yes, that is what I observed too. As long as edit mode in Python code window is enabled, changes on the blockly side get ignored. (I guess that's to prevent changes from being overwritten.)

  Thanks
  Felix