rtic-monotonics: Simplify features, default is 1kHz

Make 100 Hz or 10 kHz opt in through features,
which are meant for testing primarily.

rtic-monotonics/CHANGELOG.md

@@ -13,4 +13,4 @@ For each category, *Added*, *Changed*, *Fixed* add new entries at the top!
 
 ### Fixed
 
-## [v0.1.0] - 2023-xx-xx
+## [v1.0.0] - 2023-xx-xx

rtic-monotonics/Cargo.toml

@@ -22,10 +22,8 @@ embedded-hal-async = "0.2.0-alpha.0"
 fugit = { version = "0.3.6", features = ["defmt"] }
 rtic-time = { version = "1.0.0-alpha.0", path = "../rtic-time" }
 atomic-polyfill = "1"
+cfg-if = "1.0.0"
 
 [features]
-default = ["systick_1khz"]
-
 systick_100hz = []
-systick_1khz = []
 systick_10khz = []

rtic-monotonics/src/systick_monotonic.rs

@@ -8,16 +8,23 @@ use cortex_m::peripheral::SYST;
 use embedded_hal_async::delay::DelayUs;
 pub use fugit::ExtU32;
 
-#[cfg(feature = "systick_100hz")]
+// Features should be additive, here systick_100hz gets picked if both
+// `systick_100hz` and `systick_10khz` are enabled.
+
+cfg_if::cfg_if! {
+    if #[cfg(feature = "systick_100hz")]
+    {
         const TIMER_HZ: u32 = 100;
-
-#[cfg(feature = "systick_1khz")]
-const TIMER_HZ: u32 = 1_000;
-
-#[cfg(feature = "systick_10khz")]
+    } else if #[cfg(feature = "systick_10khz")]
+    {
         const TIMER_HZ: u32 = 10_000;
+    } else {
+        // Default case is 1 kHz
+        const TIMER_HZ: u32 = 1_000;
+    }
+}
 
-/// Systick implementing `rtic_monotonic::Monotonic` which runs at 1 kHz.
+/// Systick implementing `rtic_monotonic::Monotonic` which runs at 1 kHz, 100Hz or 10 kHz.
 pub struct Systick;
 
 impl Systick {

rtic/Cargo.toml

@@ -51,7 +51,7 @@ lm3s6965 = "0.1.3"
 cortex-m-semihosting = "0.5.0"
 rtic-time = { path = "../rtic-time" }
 rtic-channel = { path = "../rtic-channel" }
-rtic-monotonics = { path = "../rtic-monotonics", default-features = false }
+rtic-monotonics = { path = "../rtic-monotonics" }
 
 [dev-dependencies.futures]
 version = "0.3.26"