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Table of Contents
Micropython
Python for microcontrollers.
Setup
Install ESPTool
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.
