From 6da7f63fb3adf3fa7ba474394ba36d605daf17e0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rom=C3=A1n=20C=C3=A1rdenas?= <rcardenas.rod@gmail.com>
Date: Sun, 19 Mar 2023 20:22:32 +0100
Subject: [PATCH] cortex-m as optional dependency

---
 rtic/Cargo.toml    | 14 +++++++-------
 rtic/src/export.rs | 22 ++++++++++++++++------
 rtic/src/lib.rs    | 13 ++-----------
 3 files changed, 25 insertions(+), 24 deletions(-)

diff --git a/rtic/Cargo.toml b/rtic/Cargo.toml
index 9f6d24dded..c9cab17302 100644
--- a/rtic/Cargo.toml
+++ b/rtic/Cargo.toml
@@ -34,7 +34,7 @@ version = "2.0.0-alpha.0"
 name = "rtic"
 
 [dependencies]
-cortex-m = "0.7.0"
+cortex-m = { version = "0.7.0", optional = true }
 bare-metal = "1.0.0"
 #portable-atomic = { version = "0.3.19" }
 atomic-polyfill = "1"
@@ -65,17 +65,17 @@ trybuild = "1"
 [features]
 default = []
 
-thumbv6-backend = ["rtic-macros/cortex-m-source-masking"]
-thumbv7-backend = ["rtic-macros/cortex-m-basepri"]
-thumbv8base-backend = ["rtic-macros/cortex-m-source-masking"]
-thumbv8main-backend = ["rtic-macros/cortex-m-basepri"]
+thumbv6-backend = ["cortex-m", "rtic-macros/cortex-m-source-masking"]
+thumbv7-backend = ["cortex-m", "rtic-macros/cortex-m-basepri"]
+thumbv8base-backend = ["cortex-m", "rtic-macros/cortex-m-source-masking"]
+thumbv8main-backend = ["cortex-m", "rtic-macros/cortex-m-basepri"]
 # riscv-clic-backend = ["rtic-macros/riscv-clic"]
 # riscv-ch32-backend = ["rtic-macros/riscv-ch32"]
 # riscv-esp32c3-backend = ["rtic-macros/riscv-esp32c3"]
 
 # needed for testing
-rtic-uitestv7 = ["thumbv7-backend", "rtic-macros/cortex-m-basepri"]
-rtic-uitestv6 = ["thumbv6-backend", "rtic-macros/cortex-m-source-masking"]
+rtic-uitestv7 = ["thumbv7-backend"]
+rtic-uitestv6 = ["thumbv6-backend"]
 test-critical-section = ["cortex-m/critical-section-single-core", "rtic-monotonics/systick-100hz"]
 
 # [[example]]
diff --git a/rtic/src/export.rs b/rtic/src/export.rs
index 9040b63962..ef545ad750 100644
--- a/rtic/src/export.rs
+++ b/rtic/src/export.rs
@@ -32,13 +32,23 @@ pub use cortex_source_mask::*;
 #[cfg(any(feature = "cortex-m-source-masking", feature = "rtic-uitestv6"))]
 mod cortex_source_mask;
 
+#[cfg(feature = "cortex-m")]
+pub use cortex_m::{interrupt::InterruptNumber, peripheral::NVIC};
+
+/// Sets the given `interrupt` as pending
+///
+/// This is a convenience function around
+/// [`NVIC::pend`](../cortex_m/peripheral/struct.NVIC.html#method.pend)
+#[cfg(feature = "cortex-m")]
+pub fn pend<I>(interrupt: I)
+where
+    I: InterruptNumber,
+{
+    NVIC::pend(interrupt);
+}
+
 /// Priority conversion, takes logical priorities 1..=N and converts it to NVIC priority.
-#[cfg(any(
-    feature = "cortex-m-basepri",
-    feature = "cortex-m-source-masking",
-    feature = "rtic-uitestv6",
-    feature = "rtic-uitestv7",
-))]
+#[cfg(feature = "cortex-m")]
 #[inline]
 #[must_use]
 pub const fn cortex_logical2hw(logical: u8, nvic_prio_bits: u8) -> u8 {
diff --git a/rtic/src/lib.rs b/rtic/src/lib.rs
index a193e5cf76..ac05d93d6c 100644
--- a/rtic/src/lib.rs
+++ b/rtic/src/lib.rs
@@ -33,7 +33,6 @@
 //deny_warnings_placeholder_for_ci
 #![allow(clippy::inline_always)]
 
-use cortex_m::{interrupt::InterruptNumber, peripheral::NVIC};
 pub use rtic_core::{prelude as mutex_prelude, Exclusive, Mutex};
 pub use rtic_macros::app;
 // pub use rtic_monotonic::{self, Monotonic};
@@ -47,16 +46,8 @@ pub mod mutex {
 #[doc(hidden)]
 pub mod export;
 
-/// Sets the given `interrupt` as pending
-///
-/// This is a convenience function around
-/// [`NVIC::pend`](../cortex_m/peripheral/struct.NVIC.html#method.pend)
-pub fn pend<I>(interrupt: I)
-where
-    I: InterruptNumber,
-{
-    NVIC::pend(interrupt);
-}
+#[cfg(feature = "cortex-m")]
+pub use export::pend;
 
 use core::cell::UnsafeCell;