---
title: "Greger Sernemar (@GregDeMare) | Hashnode"
description: "Greger Sernemar (@GregDeMare) writes on Hashnode. Read their latest articles and follow their work."
url: "https://hashnode.com/@GregDeMare"
---

@GregDeMare

# Greger Sernemar

@GregDeMare · Joined December 2022

## Comments

[Hello Omar, I try to test this example but I get compile errors! Do you know what is the problem? Regards, Greger Sernemar error\[E0635\]: unknown feature impl\_trait\_projections --> /Users/greggoogelgs/.cargo/registry/src/github.com-1ecc6299db9ec823/embedded-io-0.4.0/src/lib.rs:2:59 | 2 | #!\[cfg\_attr(feature = "async", feature(async\_fn\_in\_trait, impl\_trait\_projections))\] | ^^^^^^^^^^^^^^^^^^^^^^ Compiling cortex-m v0.7.7 Compiling futures-channel v0.3.25 error\[E0760\]: async fn return type cannot contain a projection or Self that references lifetimes from a parent scope --> /Users/greggoogelgs/.cargo/registry/src/github.com-1ecc6299db9ec823/embedded-io-0.4.0/src/asynch.rs:86:49 | 86 | async fn read(&mut self, buf: &mut \[u8\]) -> Result<usize, Self::Error> { | ^^^^^^^^^^^^^^----^^^^^^^^ | | | help: consider spelling out the type instead: <&mut T as asynch::Read>](https://hashnode.com/posts/embedded-rust-embassy-gpio-button-controlled-blinking/637bdccf5271d494290252b3/comment/63b8709e624134a0c9b364f9)

Comment · Article · Jan 6, 2023 · [Embedded Rust & Embassy: GPIO Button Controlled Blinking](https://hashnode.com/posts/embedded-rust-embassy-gpio-button-controlled-blinking/637bdccf5271d494290252b3)

[Thank you for your interesting post. I had never heard about embassy for rust, so this was really interesting to learn something new! Embassy seams to be a very good HAL för ST32. I have ordered a NUCLEO-WL55JC2 with wifi and lora to start experimenting! Looking forward to more posts on this subject! Best regards, Greg in Sweden. PS. I'm missing how to make and connect the serial cable. DS.](https://hashnode.com/posts/embedded-rust-embassy-uart-serial-communication/6384eac4790c536ad5786143/comment/6388b102a347f35e460d070c)

Comment · Article · Dec 1, 2022 · [Embedded Rust & Embassy: UART Serial Communication](https://hashnode.com/posts/embedded-rust-embassy-uart-serial-communication/6384eac4790c536ad5786143)