Error: matches multiple boards

[bestia-dev]

When I run this command:
$ cargo pio new -b sipeed-longan-nano my_blink2
I got this error:
Error: Configured board 'sipeed-longan-nano' matches multiple boards in PIO: [sipeed-longan-nano, sipeed-longan-nano]

How can I correct this?
I asked PlatformIO community if it is normal to have multiple boards with the same ID and they answer that is normal: "A board is only unique per platform." https://community.platformio.org/t/multiple-board-id-sipeed-longan-nano/22827
So I added the platform:
$ cargo pio new -b sipeed-longan-nano -p GD32V my_blink2
But I got the same error.
I there something I missed and need to add?

I use the PlatformIO extension for VSCode in WSL2 Debian. Also, the cargo pio command is executed in WSL2 Debian.

[ivmarkov]

Nothing missing really, it is just that the current resolution algorithm assumes that the board name is unique across platforms. Let me try to fix it. Once/if fixed, your command cargo pio new -b sipeed-longan-nano -p GD32V my_blink2 should be working.

[ivmarkov]

OK, so I've published a new version of cargo-pio so you can try it out by re-issuing:

• cargo install cargo-pio

The following command line now works:

• cargo pio new -b sipeed-longan-nano -p gd32v my_blink2 (please note the lowercase name of the platform; matching is case sensitive)

... however, I cannot test the build of the resulting crate, because of this issue in PlatformIO.

Hope that helps.

[ivmarkov]

By the way... this board looks like a pretty simple thing - no WiFi, BLE or anything like that. And only 32KB RAM / 128KB flash.

So if you really want to code in Rust for it, I don't see the need to go the Cargo->PIO route. Why not just using this crate, and forget about PlatformIO?

[bestia-dev]

Great! Thank you.
Now it works flawlessly. Yes, Longan Nano is super cute and it has a Risc-V processor. I am a "fan" of rust and Risc-V and wanted to play with this combination.
Thank you for the tip for seedstudio-gd32v. I will give it a try.
I wrote some instructions how to setup a development environment for Longan Nano in Win10 + WSL2 Debian for the rust language:
https://github.com/LucianoBestia/longan_nano_rust_wsl2_platformio_setup
I needed to solve some workarounds, but now it works.
I read lately that the ESP32-C will have a Risc-V processor with Wi-Fi and Bluetooth 5. Sounds like a good future.

[ivmarkov]

Great! Thank you.
Now it works flawlessly. Yes, Longan Nano is super cute and it has a Risc-V processor. I am a "fan" of rust and Risc-V and wanted to play with this combination.
Thank you for the tip for seedstudio-gd32v. I will give it a try.

The longan-nano crate actually looks like even more appropriate for your board, so I guess you should keep using that.

I wrote some instructions how to setup a development environment for Longan Nano in Win10 + WSL2 Debian for the rust language:
https://github.com/LucianoBestia/longan_nano_rust_wsl2_platformio_setup

That's great and I'll put edition = "2018" by default in the autogenerated lib.rs by cargo-pio. However my point is: you don't need cargo-pio actually?
Your project relies on a pure-Rust crate (longan-nano) and it is not interfacing with any Vendor SDK and/or C APIs. So why bother with PlatformIO and cargo-pio at all?

Just turn your demo crate from "static lib" to a binary crate one, say !#[cfg(no_main)] and you should be good to go. The build will generate a regular .elf file instead of the .hex one you need for flashing, but I'm sure there are pure-Rust utilities, which can do .elf to .hex and then do the flashing for your board.

I read lately that the ESP32-C will have a Risc-V processor with Wi-Fi and Bluetooth 5. Sounds like a good future.

Yes. That's the ESP32-C3 chip which is on my desk as we speak. Now, the ESP32-C3 is a whole different beast compared to your board - 10x more RAM, 40x more flash, and very difficult to write the WiFi & BLE layer from scratch in Rust, so you have to interface with the ESP-IDF SDK APIs. That's a chip where cargo-pio (either in its cargо-first variant or PIO-first) is really useful.