Implement defmt::Format for HeapStats and RegionStats

esp-alloc/Cargo.toml

@@ -23,6 +23,7 @@ default-target = "riscv32imc-unknown-none-elf"
 features       = ["nightly"]
 
 [dependencies]
+defmt                 = { version = "0.3.8", optional = true }
 cfg-if                = "1.0.0"
 critical-section      = "1.1.3"
 enumset               = "1.1.5"
@@ -33,6 +34,9 @@ document-features = "0.2.10"
 default = []
 nightly = []
 
+## Implement `defmt::Format` on certain types.
+defmt = ["dep:defmt"]
+
 ## Enable this feature if you want to keep stats about the internal heap usage such as:
 ## - Max memory usage since initialization of the heap
 ## - Total allocated memory since initialization of the heap

esp-alloc/src/lib.rs

@@ -158,6 +158,13 @@ impl Display for RegionStats {
     }
 }
 
+#[cfg(feature = "defmt")]
+impl defmt::Format for RegionStats {
+    fn format(&self, fmt: defmt::Formatter) {
+        defmt::write!(fmt, "{}", defmt::Display2Format(self))
+    }
+}
+
 /// A memory region to be used as heap memory
 pub struct HeapRegion {
     heap: Heap,
@@ -253,6 +260,13 @@ impl Display for HeapStats {
     }
 }
 
+#[cfg(feature = "defmt")]
+impl defmt::Format for HeapStats {
+    fn format(&self, fmt: defmt::Formatter) {
+        defmt::write!(fmt, "{}", defmt::Display2Format(self))
+    }
+}
+
 /// Internal stats to keep track across multiple regions.
 #[cfg(feature = "internal-heap-stats")]
 struct InternalHeapStats {