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| author | Robert Jördens <rj@quartiq.de> | 2022-02-03 12:58:50 +0100 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-02-03 12:58:50 +0100 |
| commit | c7f6e924dccf577c870b81ae24ae69785acd5bcb (patch) | |
| tree | 20b8cc25757cb9d5774657353dbd9b0da3d36be1 /book/en/src | |
| parent | c3c75f2200ebc32ca35403c528914baa8e025bed (diff) | |
Update tips_monotonic_impl.md
* There is no RTIC 0.6, only several RCs.
* Timers without interrupts (like the DWT cycle counter alone) will not be useful for `Monotonic` impls.
* Clarified some of the descriptions of the various implementations.
Diffstat (limited to 'book/en/src')
| -rw-r--r-- | book/en/src/by-example/tips_monotonic_impl.md | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/book/en/src/by-example/tips_monotonic_impl.md b/book/en/src/by-example/tips_monotonic_impl.md index 38f3e92..3b50c34 100644 --- a/book/en/src/by-example/tips_monotonic_impl.md +++ b/book/en/src/by-example/tips_monotonic_impl.md @@ -9,10 +9,10 @@ Implementing time counting that supports large time spans is generally **difficu implementing time handling was a common problem. Moreover, the relation between time and timers used for scheduling was difficult to understand. -For RTIC 0.6 we instead assume the user has a time library, e.g. [`fugit`] or [`embedded_time`], +For RTIC 1.0 we instead assume the user has a time library, e.g. [`fugit`] or [`embedded_time`], as the basis for all time-based operations when implementing `Monotonic`. -This makes it almost trivial to implement the `Monotonic` trait allowing the use of any timer in -the system for scheduling. +This makes it much easier to correctly implement the `Monotonic` trait allowing the use of +almost any timer in the system for scheduling. The trait documents the requirements for each method, and for inspiration here is a list of `Monotonic` implementations: @@ -20,8 +20,8 @@ and for inspiration here is a list of `Monotonic` implementations: - [`STM32F411 series`], implemented for the 32-bit timers - [`Nordic nRF52 series Timer`], implemented for the 32-bit timers - [`Nordic nRF52 series RTC`], implemented for the RTCs -- [`Systick based`], runs at a fixed rate - some overhead but simple -- [`DWT and Systick based`], a more efficient `Systick` based implementation, but requires `DWT` +- [`Systick based`], runs at a fixed interrupt (tick) rate - with some overhead but simple and with support for large time spans +- [`DWT and Systick based`], a more efficient (tickless) implementation - requires both `SysTick` and `DWT`, supports both high resolution and large time spans If you know of more implementations feel free to add them to this list. |