Embedded test issue

This is a minimal project to demonstrate an issue with embedded-test (v0.4). Test are designed to run on a NUCLEO-F303ZE.

Installation

You should ensure rustup is installed and up-to-date. This provides the Rust toolchain, needed to compile Rust code.

Additionally, you will need to add the relevant target to the rust toolchain. The MCU used in this project is using the ARM Cortex-M4F (with FPU support) architecture, therefore you will need to run: rustup target add thumbv7em-none-eabihf to install the relevant cross-compilation target.

Finally, you will need to install probe-rs which will allow you to flash the firmware to your device, and also provides debugging and logging (using defmt). You will then need to set up your debug probe to work with probe-rs.

To install probe-rs, run:

cargo install [email protected]

Usage

To run the tests with the debugger, attached, from the minimal-firmware subproject, run: cargo test

The device will be flashed with the firmware, and the debugger will be attached. You should see logging output in the terminal.

Error messages

The error shown when running the above command is:

ERROR !! A panic occured: "PanicInfo { payload: Any { .. }, message: Some(assertion `left == right` failed\n  left: 255\n right: -1), location: Location { file: \"/home/tom/.cargo/registry/src/index.crates.io-6f17d22bba15001f/semihosting-0.1.10/src/sys/arm_compat/mod.rs\", line: 221, col: 9 }, can_unwind: true, force_no_backtrace: false }"
└─ embedded_test::panic @ /home/tom/.cargo/registry/src/index.crates.io-6f17d22bba15001f/embedded-test-0.4.0/src/fmt.rs:62  
Frame 0: syscall_readonly @ 0x080077ee
       /home/tom/.cargo/registry/src/index.crates.io-6f17d22bba15001f/semihosting-0.1.10/src/sys/arm_compat/syscall/arm.rs:88:9
Frame 1: sys_exit_extended @ 0x080078c0
       /home/tom/.cargo/registry/src/index.crates.io-6f17d22bba15001f/semihosting-0.1.10/src/sys/arm_compat/mod.rs:198:2
Frame 2: <unknown function @ 0x00020026> @ 0x00020026
Error: Unexpected semihosting command Unknown(UnknownCommandDetails { operation: 0, parameter: 536930668 }) cmdline_requested: true
error: test failed, to rerun pass `--test simple_test`

Caused by:
  process didn't exit successfully: `probe-rs run --chip STM32F303ZETx /home/tom/code/GSP/embedded-test-issue/minimal-firmware/target/thumbv7em-none-eabihf/debug/deps/simple_test-44000fac4dbb4997` (exit status: 1)

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