Support more modules on esp32c3

[microdev1]

A list of modules that need to be modified to work on esp32c3:

• ALARM
• ANALOGIO
• AUDIOBUSIO
• COUNTIO (no PCNT)
• FREQUENCY (no PCNT)
• PARALLELDISPLAY (no I80)
• RGBMATRIX
• ROTARYIO (no PCNT)

Cannot be supported due to hardware limitations:

• IMAGECAPTURE (https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/hw-reference/chip-series-comparison.html?highlight=camera states no camera interface is available)

[rxhfcy]

• Consider adding the esp32-c3 label?

btw ALARM sure would be nice (for deep sleep support), but I do understand features don't just magically appear out of thin air.

[davidvfx07]

ALARM would be great as the ESP32C3 has a very low power state (the reason I got one).

[tannewt]

countio, frequencyio and rotaryio aren't easily doable because the C3 doesn't have a PCNT peripheral. It doesn't have I80 support for paralleldisplaybus either.

[tannewt]

This enables audiobusio: https://github.com/adafruit/circuitpython/pull/9071/files#diff-48d06efbad2c96ae11fad1ca2f81801d234625a07d4a74b46a61eccdd6ad4c2dL59

[arduino12]

Hi,

I found that only the 2MB ESP32-C3 boards have the ALARM module built-in:
TTGO T-01C3 ESP32-C3 and ESP-C3-32S (2M).

I found /ports/espressif/mpconfigport.mk sets CIRCUITPY_ALARM = 0 for ESP32C3 because its IDF_TARGET_ARCH = riscv:

ifeq ($(IDF_TARGET),esp32c3)
  IDF_TARGET_ARCH = riscv
...
endif
...
ifeq ($(CIRCUITPY_LEGACY_4MB_FLASH_LAYOUT), 1)
ifeq ($(IDF_TARGET_ARCH), xtensa)
  CIRCUITPY_ALARM ?= 1
else
  CIRCUITPY_ALARM = 0
endif
...
endif

But it does that only for the 4MB boards for some reason, the 2MB boards do gets the ALARM so its not a riscv limitation...

1. Does anyone know why it sets CIRCUITPY_ALARM = 0?
2. Does anyone know how to add the ALARM module to all the ESP32C3 boards?
   (I need it on Maker Go ESP32C3 Supermini)

As previously said by @rxhfcy and @davidvfx07,
It would be great to have low-power support for the ESP32-C3 -
using Arduino IDE I got down to 7uA with 2 GPIO wakeup sources (one high one low) and one GPIO state preserved!
I would like to achieve the same using circuitpython!

@dhalbert Any help will be appreciated!

[dhalbert]

@arduino12 This may be due to not enough flash space right now when other things are included (2MB builds may trim further, making room for alarm). In CircuitPython 10 we will get rid of the OTA partition and there should be room.

[arduino12]

Hi,

@dhalbert Thanks for your quick reply!
I changed it to CIRCUITPY_ALARM = 1 and compiled for the Maker Go ESP32C3 Supermini (my first time compiling circuitpython!)

And it works perfectly - got down to 7uA!

The original adafruit-circuitpython-makergo_esp32c3_supermini-en_US-9.2.4.bin is 1449kB.
With the added ALARM it became 1464kB so I think it worth it!

Attached here in case anyone wants to try (remove the .zip extension.. GitHub won't allow .bin so I added it).
adafruit-circuitpython-makergo_esp32c3_supermini-en_US-main_with_alarm.bin.zip

Can't wait for CP v10 🙏!