Tag: Arduino IDE

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Rollback from MicroPython to Arduino on ESP32

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I hope you find MicroPython is VERY useful and perfect for you. But just in case it doesn’t, or for any reason you want to rollback to Arduino. Here is how to do it.

Requisites

ESPTool (already installed if you went from Arduino to MicroPython)

pip3 install esptool

If there is a permissions problem doing this, try to run pip3 install either by using “sudo” or “–user” flag.

Steps

The following example assumes the USB port can be found at /dev/cu.SLAB_USBtoUART, but you may find it at /dev/ttyUSB0

  1. Erase your ESP32 Flash.
$ esptool.py --port /dev/cu.SLAB_USBtoUART erase_flash
esptool.py v2.8
Serial port /dev/cu.SLAB_USBtoUART
Connecting........__
Detecting chip type... ESP32
Chip is ESP32D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, Coding Scheme None
Crystal is 40MHz
MAC: 24:0a:c4:0c:94:78
Uploading stub...
Running stub...
Stub running...
Erasing flash (this may take a while)...
Chip erase completed successfully in 4.1s
Hard resetting via RTS pin...

  2. Thanks it! You can now go back to Arduino IDE and build and run programs on your ESP32 board!

Another useful ESPTool’s sub command

ESPTool let us retrieve the MAC address of the device from our host. This can be used for several things, like for example creating specific setup files. In order to read the ESP32 MAC address, run ESPTool with the subcommand “read_mac” as shown below

$ esptool.py --port /dev/cu.SLAB_USBtoUART read_mac
esptool.py v2.8
Serial port /dev/cu.SLAB_USBtoUART
Connecting........__
Detecting chip type... ESP32
Chip is ESP32D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, Coding Scheme None
Crystal is 40MHz
MAC: 24:0a:c4:9d:24:28
Uploading stub...
Running stub...
Stub running...
MAC: 24:0a:c4:9d:24:28
Hard resetting via RTS pin...
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Setting up ESP32 development environment in Linux (with Arduino IDE)

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Installing the IDE

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Download Arduino IDE from https://www.arduino.cc/en/Main/Software. The latest version when writing this a article is 1.8.12 (https://www.arduino.cc/download_handler.php?f=/arduino-1.8.12-linux64.tar.xz).

Extract the content of the tar.xz file where you want to have your Arduino IDE, and then, execute install.sh. If there is an error, like: 

$ ./install.sh
Adding desktop shortcut, menu item and file associations for Arduino IDE...
ln: failed to create symbolic link '/usr/local/bin/arduino': Permission denied
Adding s

try to re run the script as root

$ sudo ./install.sh

Installing the USB drivers

There are mainly two types of USB chips that may be used as Serial to USB converters, one from FTDI and the other one from SiLabs. In order to find out which chip your ESP32 board has, disconnect the board from your PC and run lsusb.

$ lsusb
Bus 002 Device 002: ID 0bda:0411 Realtek Semiconductor Corp. 4-Port USB 3.0 Hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 046d:c534 Logitech, Inc. Unifying Receiver
Bus 001 Device 010: ID 0bda:5411 Realtek Semiconductor Corp. 4-Port USB 2.0 Hub
Bus 001 Device 004: ID 8087:0aaa Intel Corp.
Bus 001 Device 003: ID 048d:8297 Integrated Technology Express, Inc. ITE Device(8595)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Then, connect the board and repeat the command.

$ lsusb
Bus 002 Device 002: ID 0bda:0411 Realtek Semiconductor Corp. 4-Port USB 3.0 Hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 046d:c534 Logitech, Inc. Unifying Receiver
Bus 001 Device 012: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP2102/CP2109 UART Bridge Controller [CP210x family]
Bus 001 Device 010: ID 0bda:5411 Realtek Semiconductor Corp. 4-Port USB 2.0 Hub
Bus 001 Device 004: ID 8087:0aaa Intel Corp.
Bus 001 Device 003: ID 048d:8297 Integrated Technology Express, Inc. ITE Device(8595)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

The new device, in this case a CP210x (Cygnal Integrated CP2102 / CP2109 UART Bridge Controller [CP210x family], is your ESP32 board.

Bus 001 Device 012: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP2102/CP2109 UART Bridge Controller [CP210x family]

Install USB driver for your board.

Adding ESP32 Boards to Arduino IDE

Arduino IDE does not support ESP32 boards (and many other 3rd party boards) by default. But adding an additional board to Arduino IDE, in this case, an ESP32 board is as easy as:

  • Start Arduino IDE and open Preferences window
  • In Additional Board Manager URLs, add the following link:
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
  • You can add several board definitions, separating URLs with comma
  • Open Boards Manager from Tools; Boards; and install the ESP32 platform.
  • After installation, select your ESP32 board from Tools; Board menu.