Merge #349

349: Add support for additional DWT counters r=adamgreig a=newAM

This adds support for these DWT counters:
* CPI counter
* Exception overhead counter
* LSU counter
* Folded-instruction counter

The getters do not have the `get_` prefix per the [C-GETTER](https://rust-lang.github.io/api-guidelines/naming.html#c-getter) API guidelines. This does not match the existing `get_cycle_count` method. I was not sure if I should maintain consistency or not, let me know if you want this changed.

Here is the documentation to validate each of the added methods:
* [ARMv7-M DWT register summary](https://developer.arm.com/documentation/ddi0403/d/Debug-Architecture/ARMv7-M-Debug/The-Data-Watchpoint-and-Trace-unit/DWT-register-summary)
    * [Control Register](https://developer.arm.com/documentation/ddi0403/d/Debug-Architecture/ARMv7-M-Debug/The-Data-Watchpoint-and-Trace-unit/Control-register--DWT-CTRL)
        * `num_comp`
            * [ARMv6-M DWT register summary](https://developer.arm.com/documentation/ddi0419/c/Debug-Architecture/ARMv6-M-Debug/The-Data-Watchpoint-and-Trace-unit/DWT-register-summary)
            * The `num_comp` method is not guarded with `#[cfg(not(armv6m))]` because it is valid for both.
        * `has_exception_trace`
        * `has_external_match`
        * `has_cycle_counter`
        * `has_profiling_counter`
        * `disable_cycle_counter`
        * `cycle_counter_enabled`
    * [CPI count register](https://developer.arm.com/documentation/ddi0403/d/Debug-Architecture/ARMv7-M-Debug/The-Data-Watchpoint-and-Trace-unit/CPI-Count-register--DWT-CPICNT)
        * `cpi_count`
        * `set_cpi_count`
    * [Exception Overhead Count register](https://developer.arm.com/documentation/ddi0403/d/Debug-Architecture/ARMv7-M-Debug/The-Data-Watchpoint-and-Trace-unit/Exception-Overhead-Count-register--DWT-EXCCNT)
        * `exception_count`
        * `set_exception_count`
    * [Sleep Count register](https://developer.arm.com/documentation/ddi0403/d/Debug-Architecture/ARMv7-M-Debug/The-Data-Watchpoint-and-Trace-unit/Sleep-Count-register--DWT-SLEEPCNT)
        * `sleep_count`
        * `set_sleep_count`
    * [LSU Count register](https://developer.arm.com/documentation/ddi0403/d/Debug-Architecture/ARMv7-M-Debug/The-Data-Watchpoint-and-Trace-unit/LSU-Count-register--DWT-LSUCNT)
        * `lsu_count`
        * `set_lsu_count`
    * [Folded-instruction Count register](https://developer.arm.com/documentation/ddi0403/d/Debug-Architecture/ARMv7-M-Debug/The-Data-Watchpoint-and-Trace-unit/Folded-instruction-Count-register--DWT-FOLDCNT)
        * `fold_count`
        * `set_fold_count`


Co-authored-by: Alex Martens <alexmgit@protonmail.com>

0 files changed, 0 insertions, 0 deletions