History

Scott Shawcroft 40118bcf57 Add `board_deinit` for use with sleep This changes lots of files to unify `board.h` across ports. It adds `board_deinit` when CIRCUITPY_ALARM is set. `main.c` uses it to deinit the board before deep sleeping (even when pretending.) Deep sleep is now a two step process for the port. First, the port should prepare to deep sleep based on the given alarms. It should set alarms for both deep and pretend sleep. In particular, the pretend versions should be set immediately so that we don't miss an alarm as we shutdown. These alarms should also wake from `port_idle_until_interrupt` which is used when pretending to deep sleep. Second, when real deep sleeping, `alarm_enter_deep_sleep` is called. The port should set any alarms it didn't during prepare based on data it saved internally during prepare. ESP32-S2 sleep is a bit reorganized to locate more logic with TimeAlarm. This will help it scale to more alarm types. Fixes #3786		2020-12-08 10:52:25 -08:00
..
board.c	Add `board_deinit` for use with sleep	2020-12-08 10:52:25 -08:00
mpconfigboard.h	wip	2019-12-05 22:45:53 -05:00
mpconfigboard.mk	fix build failures	2019-12-10 22:39:44 -05:00
pins.c	Add support for Electronut Labs Papyr.	2019-04-16 12:59:42 +05:30
README.md	Fix up end of file and trailing whitespace.	2020-06-03 10:56:35 +01:00

README.md

Setup

The Electronut Labs Papyr board is based on the nRF52840 SoC from Nordic Semiconductors. It has an e-ink display on it, along with a CR2477 battery holder.

Papyr can be programmed with the Adafruit nRF52 bootloader to

Schematic, datasheet default pin mapping etc. can be found over here. The default pin mapping can be found in the board directory.

Installing CircuitPython submodules

Before you can build, you will need to run the following commands once, which will install the submodules that are part of the CircuitPython ecosystem, and build the mpy-cross tool:

$ cd circuitpython
$ git submodule update --init
$ make -C mpy-cross

Installing the Bootloader

If the Adafruit nRF52 bootloader is installed on the board, then the bootloader allows you to update the core CircuitPython firmware and internal file system contents using serial, or USB CDC, or USB mass storage.

On empty devices, the bootloader will need to be flashed once using a HW debugger such as a Segger J-Link, or Blackmagicprobe (or Electronut labs Bumpy).

Building and Flashing CircuitPython

No special notes for this, follow ports/nrf generic README.md.

Flashing CircuitPython with MSC UF2

uf2 file is generated last by all target.

$ cd ports/nrf
$ make V=1 SD=s140 SERIAL=/dev/ttyACM0 BOARD=electronut_labs_papyr all
...
...
python3 ../../tools/uf2/utils/uf2conv.py -f 0xADA52840 -c -o "build-electronut_labs_papyr-s140/firmware.uf2" build-electronut_labs_papyr-s140/firmware.hex
Converting to uf2, output size: 536576, start address: 0x26000
Wrote 536576 bytes to build-electronut_labs_papyr-s140/firmware.uf2

Simply drag and drop firmware.uf2 to the MSC, the nrf52840 will blink fast and reset after done.

Other tips

Once circuitpython is running on your board, it will come up as a mass storage device named CIRCUITPY, where you can drop in your python code. The file names it looks for are main.py, main.txt, code.py or code.txt.