not relevant to the eg crate but "embedded graphics" as a topic: the palette crate has a std feature, but when I don't have that activated I get odd build errors, any ideas?

   Compiling palette v0.7.6
error[E0277]: the trait bound `f32: Round` is not satisfied
   --> /Users/ace/.cargo/registry/src/index.crates.io-6f17d22bba15001f/palette-0.7.6/src/angle.rs:127:40
    |
127 |                     self - Round::ceil(((self + 180.0) / 360.0) - 1.0) * 360.0
    |                            ----------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Round` is not implemented for `f32`
    |                            |
    |                            required by a bound introduced by this call
...
179 | impl_angle_float!(f32, f64);
    | --------------------------- in this macro invocation
    |
help: this trait has no implementations, consider adding one
   --> /Users/ace/.cargo/registry/src/index.crates.io-6f17d22bba15001f/palette-0.7.6/src/num.rs:234:1
    |
234 | pub trait Round {
    | ^^^^^^^^^^^^^^^
    = note: this error originates in the macro `impl_angle_float` (in Nightly builds, run with -Z macro-backtrace for more info)

I did check docs and source, sadly couldn't find any hints apart from this bit of macro expansion which is a bit too thin for me:

#[cfg(any(feature = "std", all(test, not(feature = "libm"))))]
impl Round for f32 {

In reply to @jamwaffles:matrix.org
I think that just says you need to enable the libm feature no?

In reply to @trepidacious:matrix.org
I've been working with embedded-graphics-framebuf and mipidsi to drive an ST7789 screen (320x240) from an RP2040 under embassy, it gives okayish performance but it takes about 110ms to just fill_contiguous the frame buffer to the display. It looks like DMA might be used, but I've not found yet how to work out whether it will be? The SPI is running at 64MHz AFAICT, so theoretically it should manage to send a whole screen in say 24ms or so?

In reply to @jamwaffles:matrix.org
I don't know what the expected perf is from RP2040, but just to check the obvious, are you running with --release?

In reply to @bugadani:matrix.org
oh wow I have no idea, embedded-menu isn't working knowledge for me right now 😣