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Async Rust is amazing, but far from flawless. In this blog, I'll walk you through the current struggles and possible solutions.
embeddedasyncrust
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As part of my internship at Tweede golf this summer I was tasked with improving the async debugging experience for embedded development. This work resulted in a prototype async debugger for embassy, a common async runtime for embedded systems.
developmentembeddedasyncrust
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Asynchronous programming is pretty weird. While it is straightforward enough to understand in principle (write code that looks synchronous, but may be run concurrently yada yada yada), it is not so obvious how and when async functions actually perform work. This blog aims to shed light on how that works in Rust.
open-sourceweb-developmentasyncrust
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It's time for another technical blog post about async Rust on embedded. This time we're going to pitch Embassy/Rust against FreeRTOS/C on an STM32F446 microcontroller.

embeddedIoTasyncrust
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In our last post, we've seen that async can help reduce power consumption in embedded programs. The async machinery is much more fine-grained at switching to a different task than we reasonably could be. Embassy schedules the work intelligently, which means the work is completed faster and we race to sleep. Our application actually gets more readable because we programmers mostly don't need to worry about breaking up our functions into tasks and switching between them. Any await is a possible switching point.

Now, we want to actually start using async in our programs. Sadly there are currently some limitations. In this post, we'll look at the current workarounds, the tradeoffs, and how the limitations might be partially resolved in the near future.

embeddedIoTasyncrust
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Previously we talked about conserving energy using async. This time we'll take a look at performing power consumption measurements. Our goal is first to get a feel for how much power is consumed, and then to measure the difference between a standard synchronous and an async implementation of the same application.
embeddedIoTasyncrust
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To more effectively write Embedded Rust applications, we want a clearer picture of two aspects: how can we ergonomically perform multiple tasks concurrently, and how can we exploit low-power modes to save energy. In the coming weeks, we want to write a small but non-trivial application that communicates with 2 sensors, uses async, and uses the low-power modes to conserve energy.
embeddedIoTasyncrust
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Typically embedded devices are developed using C++. At Tweede golf we have chosen to use Rust instead for implementing our embedded devices. This is controversial as the embedded hardware field is generally quite conservative. Convincing our clients to adopt Rust for their products can be a challenge.
embeddedasyncrust
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