Automatic Firmware Update

[asterics]

Automatic Firmware Update

[benjaminaigner]

IMHO we need:

1. detect esptool.py DTR/RTS behaviour
2. redirect DTR/RTS lines to GPIO0 & RESET lines of ESP32 (I think we should route both signals of the ESP32miniBT module to the AUX header and remove the buttons from the PCB)
3. route the USB serial data directly to the ESP32 module

One question still exists:
How to use the UART interfaces? programming the ESP32 is done via UART0 as well as the debug output.
The communication between Teensy and ESP32 is done via UART2.

Options:

• Write own bootloader
• Route both UARTs from ESP32 to AUX header -> Software Serial necessary because we don't have full Teensy serial port on AUX header (only TX2).
• Write some kind of OTA firmware, without changing the PCB at all

[benjaminaigner]

I think the most compatible way with the current PCB & firmware would be the OTA way:

https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/ota.html

We could use one of the examples, but instead of updating via HTTP(s) we could use the data from UART.

Nevertheless, hopefully the Flash memory of the Teensy allows such changes :-)

[benjaminaigner]

Closed a few years ago :-), see: https://github.com/asterics/esp32_addon_bootloader