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Table of Contents

Micropython

Python for microcontrollers.

Setup

Install ESPTool for ESP8266 and ESP32. Install st-link for STM32.

ESP32

To reset the device for access by esptool, hold IO0 and tap EN. Release IO0.

Erase flash chip

esptool.py --chip esp32 --port /dev/ttyUSB0 erase_flash
esptool.py v3.0-dev
Serial port /dev/ttyUSB0
Connecting........_____.
Chip is ESP32-D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: 30:ae:a4:fe:03:80
Uploading stub...
Running stub...
Stub running...
Erasing flash (this may take a while)...
Chip erase completed successfully in 6.4s
Hard resetting via RTS pin...

Fetch firmware

wget "http://micropython.org/resources/firmware/esp32-idf3-20200816-unstable-v1.12-665-g60f5b941e.bin"

Write flash chip

esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 460800 write_flash -z 0x1000 esp32-idf3-20200816-unstable-v1.12-665-g60f5b941e.bin
esptool.py v3.0-dev
Serial port /dev/ttyUSB0
Connecting........_
Chip is ESP32-D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: 30:ae:a4:fe:03:80
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 460800
Changed.
Configuring flash size...
Auto-detected Flash size: 4MB
Compressed 1448240 bytes to 925586...
Wrote 1448240 bytes (925586 compressed) at 0x00001000 in 23.4 seconds (effective 495.0 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...

Verify flash

esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 460800 verify_flash 0x1000 esp32-idf3-20200816-unstable-v1.12-665-g60f5b941e.bin
esptool.py v3.0-dev
Serial port /dev/ttyUSB0
Connecting........_____....._____....._
Chip is ESP32-D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: 30:ae:a4:fe:03:80
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 460800
Changed.
Configuring flash size...
Auto-detected Flash size: 4MB
Verifying 0x161930 (1448240) bytes @ 0x00001000 in flash against esp32-idf3-20200816-unstable-v1.12-665-g60f5b941e.bin...
-- verify OK (digest matched)
Hard resetting via RTS pin...

Run

picocom -b 115200 /dev/ttyUSB0
picocom v3.1

port is        : /dev/ttyUSB0
flowcontrol    : none
baudrate is    : 115200
parity is      : none
databits are   : 8
stopbits are   : 1
escape is      : C-a
local echo is  : no
noinit is      : no
noreset is     : no
hangup is      : no
nolock is      : no
send_cmd is    : sz -vv
receive_cmd is : rz -vv -E
imap is        :
omap is        :
emap is        : crcrlf,delbs,
logfile is     : none
initstring     : none
exit_after is  : not set
exit is        : no

Type [C-a] [C-h] to see available commands
Terminal ready

MPY: soft reboot
MicroPython v1.12-665-g60f5b941e on 2020-08-16; ESP32 module with ESP32
Type "help()" for more information.

Resources

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