joey castilloMar 5

EDIT: Solved! Thanks to @projectgus and @mnl for pointing me in the right direction. https://mastodon.social/@joeycastillo/116178688050493057

PREVIOUSLY: desperate plea for help from any #circuitpython oriented folks: I've purchased a bunch of ESP32-S2 Reverse TFT Feather boards (S2, not S3) for my students' assignment 3, but any attempt to initialize audioio.AudioOut, even for the most basic example, is met with an error:

RuntimeError: Failed to create continuous channels: not found

Show threadGusMar 5

@joeycastillo I don't know CircuitPython very well, but ESP32-S2 only has two DAC pins, IO17 and IO18 - does pin "board.A0" map to one of those?

https://docs.espressif.com/projects/esp-idf/en/stable/esp32s2/api-reference/peripherals/dac.html

Digital To Analog Converter (DAC) - ESP32-S2 - — ESP-IDF Programming Guide v5.5.3 documentation

Show threadGusMar 5
@joeycastillo ah nvm, I checked https://learn.adafruit.com/esp32-s2-reverse-tft-feather/pinouts and it does indeed! Sorry for the noise.
Adafruit ESP32-S2 Reverse TFT Feather

The Reverse TFT Feather comes with the 240x135 color TFT display on the back-side not the front-side. That makes it great for panel-mounted projects, especially with the included buttons. It's like an all-in-one display interface development board, powered by the fantastic ESP32-S2 WiFi module.

Adafruit Learning System
Show threadjoey castilloMar 5
@projectgus no worries, good to check these things! A look at the board definition confirms it, A0 is GPIO18, and looking further at the internals, this message seems to come from dac_continuous_new_channels returning ESP_ERR_NOT_FOUND, so I'm chasing into Espressif internals next. https://github.com/adafruit/circuitpython/blob/77c17696e5be01d40b78d5cbe157539d733af73a/ports/espressif/common-hal/audioio/AudioOut.c#L480
Show threadGusMar 5

@joeycastillo yeah I just had a peek too (the power of procrastination), and saw the same.

Out of interest, do you get the same error if you specify both a left and right channel (i.e. board.A0 & board.A1)?

EDIT: Nvm, I saw @mnl's reply which gets to the heart of it!

Show threadmnl mnl mnl mnl mnlMar 5

@projectgus @joeycastillo I think you are actually getting closer to it, I was just grepping around. A hunch is that (I don't know esp32-s2 at all) apparently it has one DMA channel, and I could imagine it being hard allocated to the display.

I also have to do other things now, but apparently joey still has a week! easy! 😭

Show threadjoey castilloMar 5
@mnl @projectgus Thanks for y'alls help, this pointed me 100% in the right direction. Flashing the non-TFT version, I am able to use the DAC, which points to something about the display and DMA. But also the errata note suggests that I can salvage the assignment with pwmio and more beepy output while I look into the DMA issues. THANK YOU BOTH!!!
Show threadmnl mnl mnl mnl mnl
@joeycastillo @projectgus 🥳 so glad! love your work, i hope your students have fun.
Mar 5 at 9:29pmWeb