Defmt support

[theunkn0wn1]

I recently discovered the defmt library and attempted to integrate it into one of my embedded projects.

Unfortunately it appears that heapless::Vec doesn't implement the defmt::Format trait yet, which blocks defmt integration in my downstream.

Feature request: support for defmt::Format in heapless::Vec

[korken89]

Hi, I have commented on the PR itself.

[korken89]

Available in 0.7.1

[mehmetalianil]

I get error: unknown display hint: "[u8]" from:

let mut test_vec: Vec<u8, 128> = Vec::new();
   ... 
info!("the vector: {:[u8]}", test_vec);

Am I mistaken with the format specifier?

[korken89]

Have you enabled the feature flag?

[theunkn0wn1]

In my testing i used {:?} and {=[?]}, which both compile.

        let mut data: Vec<u32, 16> = Vec::new();
        data.push(0x42).expect("Failed to push into vec...");
        data.push(0x50).expect("Failed to push into vec...");
        data.push(0x10).expect("Failed to push into vec...");

        defmt::debug!("Writing data....");
        defmt::info!("{=[?]}", data);
        defmt::debug!("populating string...");
        let string: String<32> = String::from("I like pizza");
        defmt::debug!("Emitting string...");
        defmt::info!("{:?}", string);