platform: add chip_id function to board api

src/platform/esp32.rs

@@ -103,6 +103,14 @@ impl Board for Esp32Board {
     type Output = StrideOutput<[Rgb<u8>; 310], FastWs2812Esp32Rmt<'static>>;
     type Surfaces = BufferedSurfacePool;
     type Scheduler = FixedSizeScheduler<4>;
+
+    fn chip_id() -> u64 {
+        let mut chip_id: [u8; 8] = [0; 8];
+        unsafe {
+            esp_efuse_mac_get_default(&mut chip_id as *mut u8);
+        }
+        return u64::from_be_bytes(chip_id);
+    }
     
     fn take() -> Self {
         // It is necessary to call this function once. Otherwise some patches to the runtime
@@ -120,7 +128,7 @@ impl Board for Esp32Board {
             esp_efuse_mac_get_default(&mut chip_id as *mut u8);
         }
 
-        log::info!("Setting up output for chip ID {:x?}", chip_id);
+        log::info!("Setting up output for chip ID {:x?}", Self::chip_id());
 
         const POWER_VOLTS : u32 = 5;
         const POWER_MA : u32 = 500;
@@ -135,7 +143,7 @@ impl Board for Esp32Board {
         // But the implementation spawns a thread based on the core the driver was created in,
         // so we create the driver in another thread briefly.
         // Fun stuff.
-        let output = match chip_id { // panel test board
+        let output = match Self::chip_id().to_be_bytes() { // panel test board
             [72, 202, 67, 89, 145, 204, 0, 0] => {
                 StrideOutput::new(
                     Pixbuf::new(),

src/platform/mod.rs

@@ -20,4 +20,5 @@ pub trait Board {
     fn output(&mut self) -> Self::Output;
     fn surfaces(&mut self) -> Self::Surfaces;
     fn system_tasks(&mut self) -> Self::Scheduler;
+    fn chip_id() -> u64;
 }