cargo-hf2

Replaces the cargo build command to include flashing over usb to connected uf2 devices using hf2 flashing over hid protocol.

install

cargo install cargo-hf2

Utilizes the hidapi crate which doesnt appear to need any dependencies.

On linux if building libusb fails you can also try setting up the native libusb library where it can be found by pkg-config or vcpkg.

On mac, as of Catalina you will get a permissions prompt and must follow directions to allow "Input Monitoring" for the Terminal application.

use

From a firmware directory you can run all the usual cargo build commands, --example and --release, with build replaced by hf2. Assuming the builds succeeds we open the usb device using a hardcoded whitelist and copy the file over.

$ cargo hf2 --example ferris_img --release --pid 0x003d --vid 0x239a
    Finished release [optimized + debuginfo] target(s) in 0.28s
    Flashing "./target/thumbv7em-none-eabihf/release/examples/ferris_img"
Success
    Finished in 0.037s

Optionally you can leave off pid and vid and it'll attempt to query any hid devices with the bininfo packet and write to the first one that responds

$ cargo hf2 --example ferris_img --release
    Finished release [optimized + debuginfo] target(s) in 0.24s
no vid/pid provided..
trying "" "Apple Internal Keyboard / Trackpad"
trying "Adafruit Industries" "PyGamer"
    Flashing "./target/thumbv7em-none-eabihf/release/examples/ferris_img"
Success
    Finished in 0.034s

If it cant find a device, make sure your device is in a bootloader mode. On the PyGamer, 2 button presses enables a blue and green screen that says PyGamer.

$ cargo hf2 --example ferris_img --release
    Finished release [optimized + debuginfo] target(s) in 0.20s
no vid/pid provided..
trying "" "Apple Internal Keyboard / Trackpad"
trying "" "Keyboard Backlight"
trying "" "Apple Internal Keyboard / Trackpad"
trying "" "Apple Internal Keyboard / Trackpad"
thread 'main' panicked at 'Are you sure device is plugged in and in bootloader mode?', src/libcore/option.rs:1166:5

troubleshooting

If it cant find a device, make sure your device is in a bootloader mode ready to receive firmware.

thread 'main' panicked at 'Are you sure device is plugged in and in bootloader mode?: OpenHidDeviceError', src/libcore/result.rs:1165:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

On the PyGamer, 2 button presses enables a blue and green screen that says PyGamer and also generally creates a flash drive which you should be able to see (though this doesn't use that method).

If you find another error, be sure to run with debug to see where in the process it failed and include those logs when reporting

RUST_LOG=debug hf2 -v 0x239a -p 0x003d flash -f neopixel_rainbow.bin -a 0x4000