Support recording device uuid

fw/BUILD

@@ -49,6 +49,7 @@ mbed_binary(
         "power_dist.cc",
         "power_dist_hw.h",
         "stm32g4_flash.h",
+        "uuid.h",
     ],
     deps = [
         ":git_info",

fw/power_dist.cc

@@ -35,6 +35,7 @@
 #include "fw/millisecond_timer.h"
 #include "fw/power_dist_hw.h"
 #include "fw/stm32g4_flash.h"
+#include "fw/uuid.h"
 
 namespace base = mjlib::base;
 namespace micro = mjlib::micro;
@@ -916,6 +917,7 @@ class PowerDist : public mjlib::multiplex::MicroServer::Server {
   fw::Stm32G4Flash flash_interface_;
   micro::PersistentConfig persistent_config_{
     pool_, command_manager_, flash_interface_};
+  fw::Uuid uuid_{persistent_config_};
   fw::GitInfo git_info_;
   fw::FirmwareInfo firmware_info_{pool_, telemetry_manager_, 0, 0};
 

fw/uuid.h

@@ -0,0 +1,39 @@
+// Copyright 2021 Josh Pieper, [email protected].
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <array>
+
+namespace fw {
+
+class Uuid {
+ public:
+  Uuid(mjlib::micro::PersistentConfig& config) {
+    config.Register("uuid", &data_, [](){});
+  }
+
+  struct Data {
+    std::array<uint8_t, 16> uuid = {};
+
+    template <typename Archive>
+    void Serialize(Archive* a) {
+      a->Visit(MJ_NVP(uuid));
+    }
+  };
+
+  Data data_;
+};
+
+}