Optionally implement defmt::Format

Author: bjoernQ

riscv-rt/Cargo.toml

@@ -28,6 +28,8 @@ riscv = { path = "../riscv", version = "0.14.0" }
 riscv-pac = { path = "../riscv-pac", version = "0.2.0" }
 riscv-rt-macros = { path = "macros", version = "0.5.0" }
 
+defmt = { version = "1.0.1", optional = true }
+
 [dev-dependencies]
 panic-halt = "1.0.0"
 
@@ -43,3 +45,4 @@ no-exceptions = []
 no-xie-xip = []
 device = []
 memory = []
+defmt = ["dep:defmt"]

riscv-rt/src/interrupts.rs

@@ -20,6 +20,7 @@
 // In vectored mode, we also must provide a vector table
 #[riscv::pac_enum(unsafe CoreInterruptNumber)]
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 enum Interrupt {
     SupervisorSoft = 1,
     MachineSoft = 3,

riscv-rt/src/lib.rs

@@ -707,6 +707,7 @@ pub unsafe extern "Rust" fn setup_interrupts() {
 /// Registers saved in trap handler
 #[repr(C)]
 #[derive(Debug)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct TrapFrame {
     /// `x1`: return address, stores the address to return to after a function call or interrupt.
     pub ra: usize,