From 323b847bf692a0054647536a6495f20373f6d9c7 Mon Sep 17 00:00:00 2001
From: Emil Fresk <emil.fresk@gmail.com>
Date: Wed, 29 Mar 2023 20:43:27 +0200
Subject: Adding a limit that async HALs can read and have as max prio

---
 rtic-macros/src/codegen/bindings/cortex.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'rtic-macros/src/codegen/bindings/cortex.rs')

diff --git a/rtic-macros/src/codegen/bindings/cortex.rs b/rtic-macros/src/codegen/bindings/cortex.rs
index 767befa9..eba2afca 100644
--- a/rtic-macros/src/codegen/bindings/cortex.rs
+++ b/rtic-macros/src/codegen/bindings/cortex.rs
@@ -322,3 +322,19 @@ pub fn interrupt_entry(_app: &App, _analysis: &CodegenAnalysis) -> Vec<TokenStre
 pub fn interrupt_exit(_app: &App, _analysis: &CodegenAnalysis) -> Vec<TokenStream2> {
     vec![]
 }
+
+pub fn async_prio_limit(app: &App, analysis: &CodegenAnalysis) -> Vec<TokenStream2> {
+    let max = if let Some(max) = analysis.max_async_prio {
+        quote!(#max)
+    } else {
+        // No limit
+        let device = &app.args.device;
+        quote!(1 << #device::NVIC_PRIO_BITS)
+    };
+
+    vec![quote!(
+        /// Holds the maximum priority level for use by async HAL drivers.
+        #[no_mangle]
+        static RTIC_ASYNC_MAX_LOGICAL_PRIO: u8 = #max;
+    )]
+}
-- 
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