check task priority at compile time

before we were checking the priority at runtime. The compile time error message
when the priority is too high is kind of awful though.

2 files changed, 44 insertions, 0 deletions

diff --git a/tests/cfail/priority-too-high.rs b/tests/cfail/priority-too-high.rs
new file mode 100644
index 0000000..ec32401
--- /dev/null
+++ b/tests/cfail/priority-too-high.rs
@@ -0,0 +1,22 @@
+#![no_main]
+#![no_std]
+
+extern crate lm3s6965;
+extern crate panic_halt;
+extern crate rtfm;
+
+use rtfm::app;
+
+#[app(device = lm3s6965)] //~ error evaluation of constant value failed
+const APP: () = {
+    #[init]
+    fn init() {}
+
+    // OK, this is the maximum priority supported by the device
+    #[interrupt(priority = 8)]
+    fn UART0() {}
+
+    // this value is too high!
+    #[interrupt(priority = 9)]
+    fn UART1() {}
+};
diff --git a/tests/cfail/priority-too-low.rs b/tests/cfail/priority-too-low.rs
new file mode 100644
index 0000000..6dcbfd6
--- /dev/null
+++ b/tests/cfail/priority-too-low.rs
@@ -0,0 +1,22 @@
+#![no_main]
+#![no_std]
+
+extern crate lm3s6965;
+extern crate panic_halt;
+extern crate rtfm;
+
+use rtfm::app;
+
+#[app(device = lm3s6965)]
+const APP: () = {
+    #[init]
+    fn init() {}
+
+    // OK, this is the minimum priority that tasks can have
+    #[interrupt(priority = 1)]
+    fn UART0() {}
+
+    // this value is too low!
+    #[interrupt(priority = 0)] //~ error this literal must be in the range 1...255
+    fn UART1() {}
+};