itm-tools, but with probe-rs

This is a fork of japaric’s itm-tools that aims to reproduce the feature of ITM exception tracing by use of probe-rs instead of openocd. Additionally, the ITM packet buffer on the STLink is used instead of an external UART adapter.

NOTE: An stm32f401re target is expected.

In a nutshell:

$ cargo run --bin debugger
Found 1 probe(s): [
    STLink V2-1 (VID: 0483, PID: 374b, Serial: 0671FF485151717867171923, STLink),
]
Opening the first probe...
Attaching under reset...
Flashing application...
    Finished dev [unoptimized + debuginfo] target(s) in 0.06s
Recording all ITM packets to File {
    fd: 13,
    path: "/path/to/itm-tools/itm.bin",
    read: false,
    write: true,
}
Done.
$ cargo run --bin itm-decode -- itm.bin
ExceptionTrace { function: Enter, number: 22 }
LocalTimestamp { delta: 39, tc: 0, len: 2 }
ExceptionTrace { function: Enter, number: 24 }
LocalTimestamp { delta: 183, tc: 0, len: 3 }
ExceptionTrace { function: Exit, number: 24 }
LocalTimestamp { delta: 1078, tc: 0, len: 3 }
ExceptionTrace { function: Enter, number: 23 }
LocalTimestamp { delta: 3, tc: 0, len: 1 }
ExceptionTrace { function: Exit, number: 23 }
LocalTimestamp { delta: 565, tc: 0, len: 3 }
ExceptionTrace { function: Return, number: 22 }
LocalTimestamp { delta: 7, tc: 0, len: 2 }
ExceptionTrace { function: Enter, number: 0 }
LocalTimestamp { delta: 39185, tc: 0, len: 4 }
LocalTimestamp { delta: 1999999, tc: 0, len: 4 }
LocalTimestamp { delta: 1999999, tc: 0, len: 4 }
ExceptionTrace { function: Enter, number: 0 }
LocalTimestamp { delta: 1487802, tc: 0, len: 4 }
$ cargo run --bin excevt -- -t itm.bin
 TIMESTAMP   EXCEPTION
!000000000 → IRQ(6)
=000000183 → IRQ(8)
=000001261 ← IRQ(8)
=000001264 → IRQ(7)
=000001829 ← IRQ(7)
=000001836 ↓ IRQ(6)
=000041021 → Thread
=005528823 → Thread

See upsteam documentation on how to intepret the output of itm-decode and excevt.