When it was launched the new Arduino Yun (named Rev.2) and the Yun Shield, the Linux distribution running on the board, OpenWrt, was updated as well. In particular, a key component for Irrighino has been replaced with its newer version, the php engine.
If you own a “first generation” Arduino Yun and you’d like to test the new functionalities shipped with Rev.2, in this post I explain how you can update the operating system of your board!
The commands you have to issue on your Yun to install all the required components for Irrighino now are:
In the previous two posts of this tutorial, I explained how to perform an over-the-air update of the firmware running on the esp32 chip.
Sometimes you may need to revert to the factory firmware, that is the firmware stored in the flash memory when the chip was programmed. Many consumer devices have a button or a pin that, if you press it for some seconds, triggers a reset function:
In this post I’ll show you how to add this functionality to your project.
As explained in a previous post, the flash memory connected to the esp32 chip is divided into some partitions, based on a layout configured when you program the chip.
Partitions that can store firmwares are of the app type. The partition that contains the firmware programmed via USB, has the factory subtype.
The esp-idf framework includes a method to search partitions in the flash memory:
In the following video you can see how to perform a factory reset. In the video you can also learn how to “count” the number of seconds a button is pressed to trigger the reset function only after a fixed threshold (3 seconds in my example). Enjoy!
In my previous tutorial I explained how to build a simple DCC accessory decoder with Arduino.
To keep the sketch simple, all the configuration parameters for the decoder (in particular its address) were defined as constants:
Often it can be useful to change the configuration of the decoder without re-programming its firmware (= the sketch that runs on the ATMega microcontroller). The DCC standard includes a document (S-9.2.2 DCC Configuration Variables) that introduces – for the decoders – the idea of Configuration Variables (CV).
CVs are parameters, stored in a non-volatile way (it means that the values are kept also when the power is off) in the decoders, which can define the behavior of the decoder itself.
NMRA defines, in the same S-9.2.2 document, a list of CVs – numbered from 1 to 1024 – and a meaning for each of them. For example, for an accessory decoder it is established that its address (9 bits) is contained in CV513 and 521:
When you buy a commercial decoder, in the manual it is always given a table that indicates, for each supported CV, the meaning. For example, the manual of the ESU SwitchPilot Servo decoder, a decoder able to command servos to activate turnouts or other movements, lists the CVs that control position and speed of the 4 servos:
Many digital stations support the service mode (document S-9.2.3), that is, they are able to program the values of the CVs of a decoder connected to a particular output, called the programming track. The model maker can therefore adjust the behavior of the decoders installed in the locomotives or that control accessories simply positioning the locomotives (or connecting the accessory decoders) on the programming track and programming the correct values in the CVs.
CV1 vs CV513
The NMRA standard provides that the CVs that can be used by accessory decoders are those from 513 to 1024. In fact, many manufacturers, in order not to create confusion or differences between the different types of decoders, have decided to use “low” CV numbers for accessory decoders. This is the reason why many accessory decoders use CVs 1 and 9 to configure their address.
Once you have learned the meaning of the CVs, let’s see how to manage their programming in our sketch.
We have to store the CV values in a memory that is not erased every time we turn off the decoder. The ATMega328 processor used by the Arduino Uno has a non-volatile memory of 1024 bytes and, thanks to the Arduino’s EEPROM library, we can store and read values from this memory.
The NmraDcc library can independently manage the CVs or – alternatively – leave it completely to the external program.
For example, in the case of writing a CV (the command station that writes the value of a CV in the decoder), the NmraDcc library offers two callback functions:
The first substitutes the standard CV handling of the library, while the second one is called to notify that a CV changed its value. If you inspect the source code of the library, the difference is clear:
The library also defines the numbers of some standard CVs, including those related to the decoder address:
Let’s go back to the sketch of the LED decoder of the previous tutorial and add the CV management.
Define two CVs:
the working mode (CV10)
the blink frequency (CV11)
Thanks to CV10 it will be possible to choose whether the activated LED will be stready on (CV value = 0) or blinking (CV value = 1). In this second case, the blink frequency will be configured via the CV11 (from value 1 = 5 seconds to value 100 = 50ms).
First, let’s define a constant for each CV and its number:
You also need some variables that will contain the runtime value for those CVs to avoid continuously reading the EEPROM (which, according to the datasheet, has a life cycle of about 100,000 reads/writes):
int decoderMode;int blinkFrequency;
In the setup() method, you have to read the values of the CVs from the EEPROM and store them in the variables:
If the decoder is in blink mode, when the output status is changed, the active led is identified and the callback function is scheduled according to the frequency configured in the appropriate CV. Otherwise the led is simply switched on:
The DCC standard also includes the possibility – for a command station – to read the value of a CV of a decoder connected to the programming track. In a next article you’ll learn how to implement this feature!
Here’s a video that shows how it is possible to modify the behavior of the led decoder programming its CVs using a laptop that runs the Rocrail application connected to a SPROG command station:
This year in March, Massimo Banzi announced on the Arduino blog the production of a new revision (Rev.2) of the Arduino Yun board.
In addition to some improvements on the hardware design, the new revision offers a complete update of the software side of the Yun, that is the Linux distribution (OpenWrt) running on the board. The original Yun was indeed stuck to a distribution released in 2014 (still available in the download section of Arduino website) and that distribution contained outdated software packages which also presented some security vulnerabilites.
Who now buy a new Yun board, has the new OS version pre-installed. If you own a “Rev.1″ board, in this article you’ll learn how to update it…
In the Arduino forum, Martino Facchin (one of the contributors of the OpenWrt porting to Yun) published a post with links to an automatic updater for the different platforms (Windows, Linux, Mac). The application updates both the bootloader and the operating system (rootfs). You have to also update the bootloader because of the new OS requires a bigger partition than the original one.
Before running the updater process, there are 3 prerequisites:
the Yun board must be connected both to your computer via USB and to your home router/switch using an ethernet cable (the update process cannot happen using wifi)
your computer, which runs the updater application, must be connected to the same home network the Yun is connected to
your computer must not run softwares (like firewalls) that could block incoming connections
The third point in particular is the one that can give more problems… for example I use the Eset Internet Securitysuite and I had to temporary disable the protection:
An additional suggestion is to disable other network cards in your computer, keeping active only the one connected to the home network:
If you’re using Windows 10, it may happen that the yun-go-updater.exe program is blocked… in this case you have to cancel the block from the file properties:
If you run the program, the update process should go automatically. When complete, if you connect to the Yun board you should see the new version:
During the update process, the Yun board requests a valid IP address for your network using the DHCP protocol. Sometimes this request could fail; in this case you can assign a static IP to the board answering “n” to the first question:
In the previous post of this tutorial, I explained how it is possible to update your board Over-The-Air thanks to a feature of the Freshen IoT dashboard.
Today I’ll show you how to update the firmware running on an esp32 chip using only components included in the esp-idf framework, without the need of any external tools or platforms.
The esp-idf framework offers a set of native functions to implement, in your program, the ability to be updated over the air.
Those functions are grouped in the app_update component and to use them in your program you have to include the corresponding header file:
Altough the use of the native functions is not very difficult (on Github you can find an example program), Espressif developers have added a component to the framework that makes it even easier the over the air update if the new firmware is located on a web site.
The esp_https_ota component uses the OTA API to update the firmware of your board, downloading the binary file that contains the new firmware from a web site. As the name suggests, the only requirement (for security reason) is that the web site supports the secure version of the protocol (HTTPS).
The component is able to automatically identify an OTA partition in the flash memory that is not in use and to save the new firmware in that partition. It then configures the chip to boot from that partition:
The use is very simple. First create an esp_http_client_config_t struct to configure the URL of the file with the new firmware and the SSL certificate of the server (or the certificate of the CA that signed it):
You have to provide the certificate in PEM format. To store the certificate in your program, you can leverage the embedding binary files functionality of the firmware, as I already explained in a previous tutorial.
Then you only have to call the function:
esp_err_t ret = esp_https_ota(&ota_client_config);
to start the update process. If – when the process is complete – the ret variable contains a positive result (ESP_OK), you can reboot the chip to run the new firmware:
A real application would probably need to periodically check if a new firmware is available and, only in that case, to start the update process. How can it be done?
In the program I wrote for this post and that is explained in the video below, I’m going to show a way widely used also in commercial products… enjoy the show
In one of the first posts of this tutorial, I wrote about the bootloader and about how the flash memory is organized. That article says:
This allows to implement an over-the-air (OTA) application update process: you send the new version of your application to the esp32 chip; the version is stored in a new app partition
There are different ways to implement OTA updates for your application… today I’ll show you how to do it in an easy way, thanks to a cloud service named Freshen.
Freshen is an IoT backend, that is a cloud dashboard (published on the Internet) to manage IoT devices.
After having connected your devices to Frashen (I’ll show you later how to do it) you can:
display the list of the devices and their status
send a command to a device
manage the files stored in a device
update the firmware over-the-air (OTA)
Freshen is developed by Cesanta, the company that also develops the Mongoose library and the MongooseOS, very used in the embedded world and compatible with the esp32 chip. The service has different fees, including a free one:
To use Freshen, first you have to register, using your Github or Google account:
Cesanta offers a client library you can use to connect your IoT project based on the esp32 chip to Freshen. The library consists only in a header file (freshen.h), and is available on the official site.
The library is fully compatible with the esp-idf framework and supports all the functionalities of the dashboard:
It’s also very easy to use. First copy the freshen.h file in the main folder of your project:
Then include the file in your program:
To let the library communicate with the Freshen platform in the cloud, in your program you have to periodically call the freshen_loop() function:
This task calls the function every 2 seconds. Create the task in your app_main() with:
// start the freshen update task
xTaskCreate(&freshen_task,"freshen_task",10000, NULL,5, NULL);
The freshen_loop() function requires two parameters: the firmware version (it’s a text string at your choice, for example “v1.0″) and the access token, a code that is generated by the platform when you register a device.
Connect to the dashboard and click on Add new device:
A new device will be added (My Device #n). You can click on its name to display the details.
The access token is hidden… Click on click to copy to save it in the clipboard on your computer; you can then paste it in your program:
The device details page also allows to change the name of your device.
If you run the example program (you can download it from my Github repository) you’ll notice that, after a couple of seconds, the status of your device changes to online, to indicate that it’s correctly sending data to the dashboard:
In the details page, you can now list the functions that you can remotely call:
For example, if you call the Sys.GetInfo function you can retrieve the information about firmware version, architecture, compile date…:
To be able to update the firmware of your device over the air, you have to select an appropriate partition layout. For example you can choose the “OTA” layout that is already included in the framework:
Let’s now modify the firmware version, to be “1.1”:
then compile the program but don’t use the flash command. Note the path of the binary (compiled) file:
Select your device in the dashboard and click on OTA update selected:
Choose the .bin file that contains the new version of your firmware.
After a few moments, you’ll probably see the device going offline and return online. If the update process was successful, call the Sys.GetInfo function again and you’ll see the new version:
My smartphone is a XiaomiRedmi Note 3 Pro, running the “Global” MIUI ROM. Some days ago I brought a SIM card from a new italian operator, ho-mobile, which allows to use the tethering feature of the phone to connect external devices to the Internet.
I faced some problems before being able to use that feature… this blog post is to describe how I solved them.
Tethering was not working due to the incorrect configuration of a property of the Android operating system, called
As explained in Android source code, this property tells the O.S. if it’s necessary to use a DUN (dial-up network) APN for the tethering funcion. Actually, as well explained on Taming the Droid:
This refers to an outdated method for using your phone to emulate a dial-up modem and is not the way that modern smartphones do tethering anymore. There should be no need to use this value.
To set the property to 0 (= not required), you have to send a command in the smartphone’s shell.
Some months ago, Espressif announced the production of a new chip, named ESP32-PICO-D4.
It’s a complete SiP (System in Package), that is a chip which integrates the esp32 microcontroller, a 4Mbit flash memory, a crystal oscillator, filter capacitors and RF matching links. The chip datasheet is available on the official website.
Using this chip, it’s possible to create very small modules. I recently received one of those from Aliexpress:
To better understand how small it is, let’s compare its size with a “classic” ESP-WROOM-32 module and with a 1 euro coin:
The module includes a chip antenna; it’s also possible to connect an external antenna thanks to the presence of an I-PEX connector.
In conclusion, the availability of the ESP32-PICO-D4 SiP makes it possible to use the esp32 chip in applications where the available space is very small…
PlatformIO is an opensource ecosystem (as it’s defined in the homepage of the project) to develop IoT projects.
The heart of the platform is a software component named PlatformIO Core. This component includes:
a cross-platform compiler
a libraries and dependences manager
a serial monitor
PlatformIO Core is developed in Python and therefore it can run on different operating systems (Windows, Linux, MacOS).
Although you can use the Core component directly, PlatformIO’s strength lies in its IDE, which allows the development of multi-platform projects and integrates with the Core itself.
In this article I’m going to show you how to use PlatformIO to develop projects running on the esp32 chip.
PlatformIO IDE is provided as a plugin for two different development tools: Atom and VisualStudio Code. I tried both solutions and I preferred VSCode: both the installation and the use are simpler and more immediate.
Install VSCode after having downloaded the package from Microsoft’s website (the installer is available for Windows, Linux and MacOS).
Open the Package Manager:
search the PlatformIO IDE package, then click on Install:
wait until the installation is complete:
Now it’s time to develop your first program, which traditionally will display the sentence Hello world! on the terminal.
If it doesn’t show up automatically, open the PlatformIO’s homepage:
then click on New Project:
give a name to the project and choose a devboard based on the esp32 chip (in this example I’ll use a Lolin32 board by Wemos). PlatformIO supports both the esp-idfframework and the arduino-esp32 one. All my tutorials are based on the first one:
PlatformIO automatically creates some folders for your project. Choose the src folder (it stands for source, that is the folder which will contain the source code) and create a new file:
name the file main.c and type the simple program as it follows:
run the compiler by clicking on the corresponding button in the bottom bar:
the editor displays an error… indeed your code is using the printf() function without having included the library:
add the missing line, now you should be able to complile the code without errors:
PlatformIO can also upload the compiled program to your board. Thanks to its auto-detect feature, you usually don’t need to specify the serial port the board is connected to:
PlatformIO also includes a serial monitor you can use to test your program. By default, this monitor connects to the serial port with a speed of 9600 baud. The esp32 chip instead has a default speed of 115200 baud; you have therefore to change the platformio.ini file included in your folder as it follows:
Now open the serial monitor; you should see the correct output of your program:
I found the use of PlatformIO really immediate: after a few minutes I was able to develop, compile, load and test a program. Try it and leave a comment with your impressions!