lyusupov / post_techo

Power-on Self Test for LilyGO T-Echo (Nordic nRF52840 based) LoRaWAN GNSS tracker

POST T-Echo

Power-on Self Test for LilyGO® T-Echo (Nordic nRF52840 based) LoRaWAN GNSS tracker

• Illustrations
• Disclaimer
• CircuitPython
• Installation
• Credits

ATTENTION: This test is designed to run on top of Adafruit CiruitPython interpreter.
For an Arduino or Platformio IDE, please, use this sketch created by Lewis He.

Illustrations

e-Paper display output

REPL console output

Disclaimer

This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

CircuitPython

This power-on self test is running on top of CircuitPython 6 software from Adafruit Industies.

These 'frozen' modules are integrated into the custom CircuitPython build in order to better match the LilyGO® T-Echo board hardware specs:

• Adafruit_CircuitPython_EPD
• Adafruit_CircuitPython_GPS
• Adafruit_CircuitPython_BME280
• Adafruit_CircuitPython_framebuf
• Adafruit_CircuitPython_datetime

Installation

The T-Echo typically comes with factory pre-installed Adafruit_nRF52_Bootloader.
The Bootloader is capable to self-program an application firmware into the device. In order to simplify the firmware transfer, the bootloader emulates a "USB Mass Storage" interface.

1. Download integrated (CircuitPython6 and scripts) POST firmware binary from this location ;

2. Connect the LilyGO® T-Echo to your PC by means of a USB cable (Type-A <-> Type-C) ;

3. Double click (within 0.5 seconds) onto the device RESET button. A virtual disk with NRF52BOOT label should appear in your "File manager" afterwards.

4. Drag the downloaded firmware file by your pointing device (mouse, trackball,...) , then drop it into NRF52BOOT disk. Wait until the file transfer is complete.

Credits

Name	Subject
LilyGO company	TTGO T-Echo
Adafruit Industries	CircuitPython , e-Paper and BME280 libraries
Lewis He	MicroPython PCF8563 library
Ehong-tl	Port of SX1262 driver from RadioLib library for MicroPython

post_techo's Issues

Please update to Circuitpython8

It is look cool, no plans to update to new circuitpython version
or include build definitions to main branch?
Thanks very much.
I try yesterday all build for NRF on circuitpython.org page but no one works.

New Updates for Circuitpython 7 ?

The idea of being able to run Circuitpython on this hardware platform with Lora support onboard is amazing...

As the libraries had to be compiled in... I'm thinking it would take a lot of work to get Circuitpython 7 support for this board... but I thought I would at least ask if anyone was thinking of doing that?

Thank you very much for your time and this amazing work...

Ken