Tag Archives: esp32

ESP32 – MicroPython compiling for ESP32

We begin now a series of articles about the Espressif ESP32 MCU

ESP32 Wifi-Bluetooth Module

After having analyzed in the previous articles  MicroPython  for ESP8266, in this we start to treat MicroPython on ESP32.

The following shows how to generate the MicroPython image from the source code for the ESP32 board.

The operating system is Debian 9, previously encountered for the esptool and Adafruit-ampy utilities

MicroPython – Python on embedded devices

Log on  with the operating system user on Debian 9, sviluppo in our case; under the home folder  create the Micropython folder and inside this folder the  esp32 folder

The MicroPython source code is available at the following link

Github Micropython

Instructions to build the firmware for the ESP32 are available at the link

MicroPython esp32

Clone the repository

Go into  micropython/ports/esp32 folder

Run

The command releases the git hash for the supported espidf

At the time of our compilation the result is as follows

Go into  /home/sviluppo/Micropython/esp32 folder and clone ESPIDF

Checkout with the hash obtained above

Run

We follow the instructions at the link

Cross compiler

to install the cross compiler; install the prerequisites for building

Download the cross compiler

Create the  esp folder under /home/sviluppo/Micropython/esp32

Unpack the cross compiler in esp

Add the binary folder of the cross compiler to the PATH envinronment variable

Go into the following folder

and create the makefile file with the following code inside

Go into the micropython folder available in /home/sviluppo/Micropython/esp32

Run

to add external dependencies.

Next step is the MicroPython cross compiler build

Finally we can build the ESP32  firmware with the following commands

The firmware is generated under ports/esp32/build with the name firmware.bin.

Proceed to load the firmware with the commands

In our case, the firmware upload was successful with the command

It is also possible to load the firmware.bin image with the commands

where  /dev/ttyXXX is replaced with the actual serial port to which we connect the ESP32 board.

In the next article we’ll compile the nodemcu firmware for ESP32.

ESP32 Wifi-Bluetooth Module

In this article we describe briefly the ESP32  chip from Espressif

ESP32

This lower power SOC  contains a 32 bit MCU  with bluetooth and wifi modules. At the Espressif web site we can find the detailed informations about the ESP32

ESP32 Resources

The device datasheet is available in the following pdf document

ESP32 Datasheet

The ESP32 modules are available individually or in a development kits; the last system simplifies its usage as the development kit contains all the hardware to use rapidly the soc device; we are already ready to load the firmware and use the device.

On internet various web sites describe home automation or iot projects using this soc.

A reference site for the ESP32  is

esp32

At above link we can find the various development platforms utilized  for the ESP32. The most relevant  are

  • Arduino Ide

ESP32 Arduino

  • ESP-IDF

ESP32 IDF

  • Micropython

MicroPython

  • PlatformIO

PlatformIO

  • Firmware Lua

LuaNode

Lua-RTOS-ESP32

Nodemcu Development

We can buy the ESP32 modules/dev kits from various internet online websites, for example ebay

ESP32 on ebay

Different ESP32  modules are available from different vendors

Espressif esp-wroom-32

AI-Thinker esp32s

At the link

http://esp32.net/

different hardware configurations available are listed.

As development kits we report

AI-Thinker NodeMCU-32S

DoIT ESP32 Dev Kit

There are development kits based on esp32 that also integrate a LORA wireless  module internally

Lora

We report for example the following

Heltec Wifi LoRa 32

TTGO LoRa32

In the next articles we’ll describe how to build firmwares and use the ESP32 MCU.