Remote Upload Sketch via Command Line for Raspberry Pi PlatformIO | Teensy Forum

Can you imagine a world where remote development for embedded systems is as seamless as developing applications for desktops? PlatformIO has revolutionized the way developers approach embedded systems by offering an unparalleled ecosystem that supports declarative principles, test-driven methodologies, and modern toolchains. This article delves into how PlatformIO, in conjunction with devices like the Raspberry Pi and Teensy 4.1, transforms the landscape of embedded software development.

I am working on a project utilizing the Teensy 4.1 connected to a Raspberry Pi 4. The Raspberry Pi runs BalenaOS and manages services in docker containers through the Balena cloud. Balena is a deploy system built on Docker, allowing developers to manage their applications remotely with ease. For those unfamiliar, BalenaOS is specifically designed for IoT devices, providing robust security features and simplified updates. In this setup, the Teensy 4.1 acts as an external microcontroller interfacing with the Raspberry Pi. The integration process involves running specific commands such as `curl -fsSL which automates the configuration and deployment of necessary components.

In October 2020, I successfully set up a Raspberry Pi 3 as a remote agent. Initially, the process posed several challenges, but with persistence, I managed to create a script that simplifies the setup for others. Using rpi-imager to prepare the SD card was crucial. After mounting the SD card and opening the boot partition, creating an empty file ensured the correct configuration. A system-wide installation of PlatformIO proved more effective than virtualenv, especially since the Raspberry Pi isn't used for other purposes. Patience is key during the installation steps, as some processes can be time-consuming.

PlatformIO facilitates remote debugging by enabling GDB locally while running OpenOCD on a remote machine, such as a Raspberry Pi located elsewhere. This setup is particularly beneficial for developers who need to debug hardware placed in inaccessible locations, like a garden or industrial site. By leveraging PlatformIO's capabilities, developers can maintain control over their projects without physical proximity to the hardware.

A creative application of these technologies is showcased in a DIY Volumio remote control project based on ESP32 and OLED display. This remote control connects to Volumio via SocketIO, using WiFi for communication. It incorporates dual rotary switches for navigation and volume control, along with play/pause functionality. The Waveshare 1.5-inch OLED Display Module provides a clear interface for status updates. Although still under development, this project demonstrates the versatility of combining ESP32 microcontrollers with PlatformIO for innovative solutions.

Testing the Arduino Audio Tools library with PlatformIO on an ESP32 revealed the potential for advanced audio processing capabilities. Initially, integrating a proper debugger proved challenging due to compatibility issues. However, once resolved, the combination of PlatformIO and Arduino Audio Tools opened new possibilities for audio-based projects. This experience highlights the importance of thorough testing and debugging in embedded systems development.

The software component installation process for the Raspberry Pi includes preparing an SD card with a base image, installing utilities, and uploading the Arduino's program through the Pi. Running a PlatformIO Remote Agent on the Raspberry Pi allows for lidar-driver uploads from a desktop environment. Prerequisites include having PlatformIO installed on the desktop to facilitate seamless program uploads onto the Arduino. This setup exemplifies the collaborative nature of PlatformIO's ecosystem, bridging the gap between desktop and embedded environments.

PlatformIO extends its support beyond traditional platforms like Raspberry Pi, BeagleBone, and CubieBoard to include Mac, Linux, and Windows operating systems. Its integrated remote development feature empowers developers to work in their preferred environments while targeting various embedded platforms. Unlocking the true potential of embedded software development requires embracing tools that support declarative principles, test-driven methodologies, and modern toolchains—precisely what PlatformIO offers.

By integrating Teensy 4.1 with Raspberry Pi through BalenaOS and PlatformIO, developers gain access to a powerful toolkit for creating sophisticated IoT applications. The ability to manage services via Docker containers and perform remote debugging significantly enhances productivity. Furthermore, the flexibility provided by PlatformIO ensures compatibility across multiple platforms, making it an indispensable resource for modern embedded systems development.

This exploration of PlatformIO's capabilities underscores its role in transforming embedded software development. From setting up remote agents on Raspberry Pi to facilitating advanced audio processing on ESP32, PlatformIO continues to push boundaries. As technology evolves, so too will the tools required to harness its full potential. Developers equipped with PlatformIO are better positioned to navigate the complexities of embedded systems, delivering innovative solutions that meet the demands of today's interconnected world.