v20231122_elite

• Now based on MicroPython v1.21
• The esp32_at module now ignores non-ASCII characters (should, for example, fix crashes for certain SSIDs)

v20211025_elite

• New frozen modules: pycc1101, esp32_at, and uart_passthrough
• Upgrade ulab to v3.3.1
• Now based on MicroPython v1.17 (+commits up to 20210921)

ESP32 Micropython firmware for eLITe-Connect

Requirements

esptool.py (it might be required to use a special version from here: https://github.com/eliteboard/esptool)

Flashing procedure

• Run the following script on the eLITe-Board (STM32) to enable UART passthrough (connect to /dev/ttyACMx using Thonny, screen, or any terminal software)

from pyb import UART
import select

uart4 = UART(4, 115200, timeout=0, rxbuf=1024)  # to/from PC
uart7 = UART(7, 115200, timeout=0, rxbuf=1024)  # to/from eLITe-Connect

def pass_through(uart1, uart2):
    while True:
        select.select([uart1, uart2], [], [])
        if uart1.any():
            uart2.write(uart1.read(1020))
        if uart2.any():
            uart1.write(uart2.read(1020))

pass_through(uart4, uart7)

• The ESP32 needs to be put into flash mode by pressing and holding the boot button. After a short press of reset (while still holding boot) it should be in flash mode. Then you need to:
• Delete flash: esptool.py --chip esp32 --port /dev/ttyACMy erase_flash (check the correct port number)
• Write binary to flash: esptool.py --chip esp32 --port /dev/ttyACMy --baud 115200 write_flash -z 0x1000 firmware.bin (note that 115200 bps is the only valid speed)

Further hints

The flash mode can also be activated while esptool is running. This approach gives you immediate feedback.
So far it was observed that the STM32 port is /dev/ttyACM2 whereas the ESP can be accessed over /dev/ttyACM1 (while above passthrough script is running)

Release Feb. 16 2021

Major changes:
Add pin defintions for eLITe-connect

Release Dec. 22 2020

Major changes:

• Add neopixel driver (version working on any GPIO and not relying on SPI, PWM...)
• Add ulab submodule

Autumn 2020 update 1

• add frozen adafruit drivers
• add pin definition for buttons

Autumn 2020

This is the firmware that was used to test the initially shipped out boards. Furthermore this was also used in the first lab course "RSSI Scanning". Use

$ELITEBOARDDIR/gcc/bin/arm-none-eabi-gdb firmware.elf -ex "tar ext /dev/ttyACM0" -ex "mon swdp_scan" -ex "att 1" -ex "load" -ex "set confirm off" -ex "quit"

to flash the board. Note, that you might have to change ttyACM0.