I've never used that crate, but my guess is that you aren't calling the output method: https://docs.rs/hub75/0.1.1/hub75/struct.Hub75.html#method.output

Hey guys got a interesting problem. In the progress of updating my embassy_rp project to their latest git version using epd-waveshare for my display. And I had this bit of code that worked before but now doesn't cause the epd-waveshare has tightened up its API just lost for what to do to resolve this any help or guidance appreciated!

    let mut spi_d_cfg = embassy_rp::spi::Config::default();
    spi_d_cfg.frequency = 4000000;
    let mut spi_d = embassy_rp::spi::Spi::new_blocking_txonly(p.SPI1, p.PIN_10, p.PIN_11, spi_d_cfg);

    let busy_d = Input::new(p.PIN_13, Pull::None);
    let dc_d = Output::new(p.PIN_8, Level::Low);
    let rst_d = Output::new(p.PIN_12, Level::Low);
    let mut delay = Delay;
    let mut epd = EPD3in7::new(&mut spi_d, busy_d, dc_d, rst_d, &mut delay, None).unwrap();

The error is as follows

error[E0277]: the trait bound `embassy_rp::rp_pac::spi::Spi: embedded_hal::spi::SpiDevice` is not satisfied
   --> src/main.rs:140:32
    |
140 |     let mut epd = EPD3in7::new(&mut SPI1, busy_d, dc_d, rst_d, &mut delay, None).unwrap();
    |                   ------------ ^^^^^^^^^ the trait `embedded_hal::spi::SpiDevice` is not implemented for `embassy_rp::rp_pac::spi::Spi`
    |                   |
    |                   required by a bound introduced by this call

Hey guys got a interesting problem. In the progress of updating my embassy_rp project to their latest git version using epd-waveshare for my display. And I had this bit of code that worked before but now doesn't cause the epd-waveshare has tightened up its API just lost for what to do to resolve this any help or guidance appreciated!

    let p = embassy_rp::init(Default::default());
// ...
    let mut spi_d_cfg = embassy_rp::spi::Config::default();
    spi_d_cfg.frequency = 4000000;
    let mut spi_d = embassy_rp::spi::Spi::new_blocking_txonly(p.SPI1, p.PIN_10, p.PIN_11, spi_d_cfg);

    let busy_d = Input::new(p.PIN_13, Pull::None);
    let dc_d = Output::new(p.PIN_8, Level::Low);
    let rst_d = Output::new(p.PIN_12, Level::Low);
    let mut delay = Delay;
    let mut epd = EPD3in7::new(&mut spi_d, busy_d, dc_d, rst_d, &mut delay, None).unwrap();

The error is as follows

error[E0277]: the trait bound `embassy_rp::rp_pac::spi::Spi: embedded_hal::spi::SpiDevice` is not satisfied
   --> src/main.rs:140:32
    |
140 |     let mut epd = EPD3in7::new(&mut SPI1, busy_d, dc_d, rst_d, &mut delay, None).unwrap();
    |                   ------------ ^^^^^^^^^ the trait `embedded_hal::spi::SpiDevice` is not implemented for `embassy_rp::rp_pac::spi::Spi`
    |                   |
    |                   required by a bound introduced by this call

In reply to @grantm11235:matrix.org
avlec: You need to wrap the spi bus with something like embedded_hal_bus::spi::ExclusiveDevice. This explains the difference between an SpiBus and an SpiDevice https://docs.rs/embedded-hal/latest/embedded_hal/spi/index.html

hey, I can see that my raspberry pi pico (through embassy_rp is not fast enough to drive hub75 protocol and it flickers A LOT. it's off most of the time :D. So my assumption is that it uses too optimistic of a color depth, I was thinking about patching it to support less ambitious color space.
https://github.com/david-sawatzke/hub75-rs/blob/ba1eaa6de065909bba5776557e7986229df54863/src/lib.rs#L236

the problem is that despite using pure colors only - red green and blue, below threshold of 6 for brightness_bits it shows no colors at all.

could someone with more expertise help me out with this?

Would anyone like to take ownership of these?

• https://github.com/jamwaffles/ssd1306/issues/209
• https://github.com/jamwaffles/ssd1331/issues/15
• https://github.com/jamwaffles/sh1106/issues/37

Otherwise I'll move them to https://github.com/rust-embedded-community in the next few days