Category: Esp32 rust

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esp32 rust

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It only takes a minute to sign up. I would like to build a gateway device which will use the ESP For this purpose, I would like to use the Modbus Rust implementation, which already exists. The process works a little like this:. Currently, there is no backend for the Xtensa architecture used by the ESP This, unfortunately, means that you cannot compile Rust code for the ESP You did say install in your question, but I assume you didn't mean that — rather, you want to run Rust code on the ESP32, not install the Rust compiler there.

However, this will be difficultand might not even work at all. You will find it a lot easier to bite the bullet and use C in this case, which is a shame, because Rust is a great language, but its embedded support is not as good as C's at the moment. The announcement even hints at this future Rust support. Here is a website where someone walks through their setup. Sign up to join this community.

The best answers are voted up and rise to the top. Asked 3 years ago. Active 1 year, 7 months ago. Viewed 9k times. Can anyone shed some light on this topic?

esp32 rust

Look at github. Active Oldest Votes. Are you aware of any other Hardware boards that support Rust? Yes, like you said I just want to run Rust programs on the device and I certainly do not want a compiler there! I imagine all of those are far more capable and expensive than you want, so it does really limit your options with Rust. Can't speak from personal experience though, as I've not used Rust for embedded applications yet. There is now a community supported fork of rustc to support the Xtensa arch mabez.

NickBroon NickBroon 1 1 silver badge 3 3 bronze badges. Hey, welcome to IoT. I would encourage you to edit this answer to make it more complete. As it stands, it's basically just a series of links with minimal explanation, and looks more like a comment than a complete answer.

Rust on the ESP32 & ESP8266 - Building an ecosystem

It would be far better to explain the answer in more detail, with the links for reference only. Just an update the previous LLVM-xtensa project has been moved to github. Theodore Nordsieck Theodore Nordsieck 81 1 1 bronze badge. Sign up or log in Sign up using Google. Sign up using Facebook.About six months ago, I made a post on reddit highlighting the launch of Espressif's llvm xtensa fork, not too long after, I had a working rustc toolchain capable of generating xtensa assembly.

At this point I had to put this project to the side to finish my final year of university.

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Funnily enough I didn't stray too far, my final year project used Rust to create a 'smartwatch' I may write about this in the future, if anyone is interested. Since then I have seen a few posts utilising my fork to run Rust on the ESP32 see this great write up by ctron, if you haven't alreadymost of which are building on top of esp-idf which is written in C.

In March ofEspressif released their first run at an llvm fork to support the xtensa architecure. Shortly after I got to work bootstrapping Rust to use this newly created fork. After many build attempts I finally got it working; I was now able to generate xtensa assembly from Rust source code!

The next step was to assemble and link the generated assembly. The llvm fork in it's current state cannot perform object generation, so we must use an external assembler. After that I created a few built-in targets which you can see here ; xtensa-espnone-elf for the ESP32; xtensa-espnone-elf for the ESP; finally the xtensa-unknown-none-elf target for a generic xtensa target.

First off, we need our basic program structure. Some of this may look vaguely familiar if you have any experience with cortex-m development on Rust, I've tried to mirror the API as best as I can. Now lets add some register definitions for the peripherals we want to use. For our blinky program, we will need to control the GPIO peripheral. In the ESP32 and most modern processors peripherals are mapped to memory adresses, commonly refered to as memory mapped peripherals.

To control a peripheral we simply need to write values to the right addresses in memory, with respect to the reference manual supplied by the chip manufacturer. Next lets setup the pin as a GPIO output. For the ESP32, this is a two step process 1. Firstly, its simply a case of setting a bit in the GPIO ouput enable register. Secondly the pin has to be configured in GPIO mode. There are not enough pins for all the possible peripherals in the chip, to combat this each pin can have multiple function modes.

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In the case of the ESP32, each pin has up to different functions, although not all are mapped. To put the pin in GPIO mode, we need to put in mode 0xwe do this by writing to the function select register. For the next stage of our blinky program, we need a way to delay; a simple approach could use for loop like so.

We add the volatile read so that the compiler doesn't optimise our delay away. The problem with this approach is that depending of the optimisation level, the number of clock cycles each iteration of the loop changes.

We need a cycle accurate way of delaying, fortunately the ESP32 has an internal clock counting register which can be accessed with the read special register rsr instruction. Now are delay function looks like this.Mostly using the ESP and Espressif, through platform.

In recent times, I have also started to really like Rust as programming language. And I really believe that all Rust has to offer, would be great match for embedded development.

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So when I had a bit of time, I wanted to give it a try. And here is what came out of it …. Well, we are not there yet. But my only intention was to play around a bit with the technology. And so I started to search what others had done in this area already. Rust, or more precisely, the default rust compiler is based on LLVM. It compiles rust code by parsing it and handing it over to the LLVM toolchain at some point. The good news: work for this is already underway.

And have you ever compiled a compiler, which is needed to compile a compiler? So the next step, after compiling LLVM on a x64 target, with the ability to cross compile to Xtensa is to compile Rust itself.

It takes a while, but the process of compiling Rust with a provided version of LLVM is more or less straight forward. After this, you are basically set up for getting started. However, it still is a bit complicated, as you do need to cross compile with Rust for the ESP.

You are running Rust on your host machine x64 and want to build for the Xtensa target architecture. This requires also to compile the core Rust crate for that architecture. This is where xargo comes into play. But for one, the tool just works and does what it should do.

And second, I also do understand the original author of the tool, setting the right expectations.

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It also seems that there is work underway in Rust to make this tool obsolete. Maybe it already is done and I just need to check. So we have a compiler now, and the core foundation to run Rust on the Xtensa architecture. But of course, we do want to interact with the ESP functionalities. At least, let an LED blink or print something out on the serial console.Since my last post, nearly 10 months ago a lot has changed.

For one, its not just me working on this any more! Community members are starting to contribute to the various ESP related projects. The extra help meant we have made considerable progress which I will now take you through in this post. I have been working on cleaning up the rustc work, including rebasing regularly to keep up with upstream rustc changes.

You can see the patchset here. On that note, it seems no progress has been made on that front in the last 9 months; whilst Espressif are doing a great job responding to issues and fixing bugs, it seems the patches are stuck in review in llvm. I'm unsure what directions to take to get more attention to this.

I have also reworked the build process, as well as tagging releases. It is no longer necessary to build LLVM seperately, as I have swapped out the LLVM submodule to the forked one, meaning you can just use normal rust build instructions. It's really nice to invoke cargo once, make a coffee, and have your code running on the board when you get back!

We've been adding more features to the tool, like reading back board info flash size, CPU revision etc in 3and allowing faster flash speeds for the ESP32 in 5. After my last post I set to improve the runtime crate to include support for exceptions, which I started before taking a short break. In that time arjanmels championed it, fully implementing exception and interrupt handling for the lx6 CPU of the ESP32! Previously xtensa-lx6 was empty, but we have since implemented and moved code from rt where neccessaryincluding the on chip timers and a series of mutex implementations for the platform.

Meanwhile icewind began writing a runtime crate for the lxthe processor in a ESP We found that between the xtensa-lx series there were not many differences, confirming what a core esp-idf developer mentioned previously, therefore we decided to merge the lx6 and lx crates producing xtensa-lx and xtensa-lx-rt with features for each silicon revision.

With the runtime crates in good shape, we now had a good basis to build a HAL Hardware abstraction layer. Since then the features haven't stopped coming, primarily thanks once again to arjanmels. Checkout the examples to see what you can do with an ESP32 in pure Rust 1! One thing that is slowing down development is the fact that alot of the functions in the C SDK are simply binary blobs or as Espressif refer to them, ROM functions.

It means that re-implementing them in Rust requires disassembly of the binaries and reverse engineering of the assembly to figure out whats going on. Whilst it is undoubtedly fun, it is a lot harder than looking at the source which we can do with the ESP With the compiler changes and HAL's being created, the old quickstart needed some love. First on the list removing some unneeded compiler restrictions, mainly around allowing debug info generation, as the LLVM fork now supports that See I have also added a brief overview of how to target a different Xtensa target other than the ESP32 or ESP, though I'm not aware of any other boards using this architecture, would be very interested to hear about it if you are aware of any.

At this point I'd like to say a big thank you to all the contributors who have helped along the way so far! Not quite! We're still using the C bootloader to initialize the flash for now.Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things applications. Skip to content. Rust ESP32 - Xtensa startup. I now need to a basic run time for the xtensa cores but I am finding it quite difficult to find documentation on the startup of the processors and contents of vector table etc.

Could you point me in the right direction to some docs or code examples if you have them? Thanks, Scott. Once that works, it's a solid base to iterate on. And as a third stage if you wanted you could take the ESP-IDF software bootloader out of the equation, and either build a bootloader in Rust or run the app directly from the ROM bootloader. Alternatively to everything I wrote above, if you want to start from the other end with very simple Rust code ie running out of IRAM only, no flash cache, etc running in place of the software bootloader - this is simpler but it leaves you with some constraints mostly, no flash cache mappings yet so you're limited to the code which fits in IRAM.

So it's a longer journey before you have a lot of functionality on the Rust side. The software bootloader entry point is basically a C function - you have a stack already, etc - because the ROM code does some setup and loads the software bootloader from flash into IRAM for you.

The software bootloader uses the same CPU exception vectors as the ROM ie stubs, basically so there isn't an example of those in the bootloader project, but you can copy the IDF exception vectors as referenced from the startup code in IDF vectors herelinker script that lays them out at correct offsets is heremoving the vector base pointer is done like this.

You could also take a look at the Zephyr or NuttX projects who have roughly that same level of functionality at the moment ie run from IRAM only, but basics are in place. If you have specific questions, feel free to ask. Thanks for the detailed response this should be plenty to get me started. I think using the idf bootloader as a makeshift runtime for Rust is a great idea, and something that can easily swapped out later if we wanted it to be written in pure Rust.

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Is the LX6 processor on the esp32 customized in anyway? The cadence datasheets I did find seemed to indicate it was very configurable. Jump to.

Rust on the ESP32

Who is online Users browsing this forum: gfurtadoalmeida and 41 guests. All times are UTC Top. About Us Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things applications.

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Rust on the ESP and how to get started

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