Simple Weather Service

Store temperatures as int16_t (instead of uint8_t previously). The temperature is expressed in °C * 100.

doc/SimpleWeatherService.md

@@ -28,11 +28,11 @@ The byte array must contain the following data:
  - [0] : Message type = `0`
  - [1] : Message version = `0`
  - [2][3][4][5][6][7][8][9] : Timestamp (64 bits UNIX timestamp, number of nanoseconds elapsed since 1 JAN 1970)
- - [10] : Current temperature (°C)
+ - [10, 11] : Current temperature (°C * 100)
- - [11] : Minimum temperature (°C)
+ - [12, 13] : Minimum temperature (°C * 100)
- - [12] : Maximum temperature (°C)
+ - [14, 15] : Maximum temperature (°C * 100)
- - [13]..[44] : location (string, unused characters should be set to `0`)
+ - [16]..[47] : location (string, unused characters should be set to `0`)
- - [45] : icon ID 
+ - [48] : icon ID 
    - 0 = Sun, clear sky
    - 1 = Few clouds
    - 2 = Clouds
@@ -48,21 +48,21 @@ The byte array must contain the following data:
 The byte array must contain the following data:
 
   - [0] : Message type = `0`
-  - [0] : Message version = `0`
+  - [1] : Message version = `0`
   - [2][3][4][5][6][7][8][9] : Timestamp (64 bits UNIX timestamp, number of nanoseconds elapsed since 1 JAN 1970)
   - [10] Number of days (Max 5, fields for unused days should be set to `0`)
-  - [11] Day 0 Minimum temperature
+  - [11,12] Day 0 Minimum temperature (°C * 100)
-  - [12] Day 0 Maximum temperature
+  - [13,14] Day 0 Maximum temperature (°C * 100)
-  - [13] Day 0 Icon ID
+  - [15] Day 0 Icon ID
-  - [14] Day 1 Minimum temperature
+  - [16,17] Day 1 Minimum temperature (°C * 100)
-  - [15] Day 1 Maximum temperature
+  - [18,19] Day 1 Maximum temperature (°C * 100)
-  - [16] Day 1 Icon ID
+  - [20] Day 1 Icon ID
-  - [17] Day 2 Minimum temperature
+  - [21,22] Day 2 Minimum temperature (°C * 100)
-  - [18] Day 2 Maximum temperature
+  - [23,24] Day 2 Maximum temperature (°C * 100)
-  - [19] Day 2 Icon ID
+  - [25] Day 2 Icon ID
-  - [20] Day 3 Minimum temperature
+  - [26,27] Day 3 Minimum temperature (°C * 100)
-  - [21] Day 3 Maximum temperature
+  - [28,29] Day 3 Maximum temperature (°C * 100)
-  - [22] Day 3 Icon ID
+  - [30] Day 3 Icon ID
-  - [23] Day 4 Minimum temperature
+  - [31,32] Day 4 Minimum temperature (°C * 100)
-  - [24] Day 4 Maximum temperature
+  - [33,34] Day 4 Maximum temperature (°C * 100)
-  - [25] Day 4 Icon ID
+  - [35] Day 4 Icon ID

src/components/ble/SimpleWeatherService.cpp

@@ -29,18 +29,30 @@ namespace {
   enum class MessageType : uint8_t { CurrentWeather, Forecast, Unknown };
 
   uint64_t ToUInt64(const uint8_t* data) {
-    return *(reinterpret_cast<const uint64_t*>(data));
+    return data[0] +
+           (data[1] << 8) +
+           (data[2] << 16) +
+           (data[3] << 24) +
+           (static_cast<uint64_t>(data[4]) << 32) +
+           (static_cast<uint64_t>(data[5]) << 48) +
+           (static_cast<uint64_t>(data[6]) << 48) +
+           (static_cast<uint64_t>(data[7]) << 56);
+  }
+
+  int16_t ToInt16(const uint8_t* data) {
+    return data[0] +
+           (data[1] << 8);
   }
 
   SimpleWeatherService::CurrentWeather CreateCurrentWeather(const uint8_t* dataBuffer) {
     SimpleWeatherService::Location cityName;
-    std::memcpy(cityName.data(), &dataBuffer[13], 32);
+    std::memcpy(cityName.data(), &dataBuffer[16], 32);
     cityName[32] = '\0';
     return SimpleWeatherService::CurrentWeather (ToUInt64(&dataBuffer[2]),
-                                                 dataBuffer[10],
+                                                ToInt16(&dataBuffer[10]),
-                                                 dataBuffer[11],
+                                                 ToInt16(&dataBuffer[12]),
-                                                 dataBuffer[12],
+                                                 ToInt16(&dataBuffer[14]),
-                                                 SimpleWeatherService::Icons{dataBuffer[13 + 32]},
+                                                 SimpleWeatherService::Icons{dataBuffer[16 + 32]},
                                                  std::move(cityName));
   }
 
@@ -51,7 +63,10 @@ namespace {
     const uint8_t nbDaysInBuffer = dataBuffer[10];
     const uint8_t nbDays = std::min(SimpleWeatherService::MaxNbForecastDays, nbDaysInBuffer);
     for (int i = 0; i < nbDays; i++) {
-      days[i] = SimpleWeatherService::Forecast::Day {dataBuffer[11 + (i * 3)], dataBuffer[12 + (i * 3)], SimpleWeatherService::Icons{dataBuffer[13 + (i * 3)]}};
+      days[i] = SimpleWeatherService::Forecast::Day {
+        ToInt16(&dataBuffer[11 + (i * 5)]),
+        ToInt16(&dataBuffer[13 + (i * 5)]),
+        SimpleWeatherService::Icons{dataBuffer[15 + (i * 5)]}};
     }
     return SimpleWeatherService::Forecast {timestamp, nbDays, days};
   }
@@ -95,7 +110,7 @@ int SimpleWeatherService::OnCommand(struct ble_gatt_access_ctxt* ctxt) {
                      currentWeather->minTemperature,
                      currentWeather->maxTemperature,
                      currentWeather->iconId,
-                     currentWeather->location);
+                     currentWeather->location.data());
       }
       break;
     case MessageType::Forecast:

src/components/ble/SimpleWeatherService.h

@@ -64,9 +64,9 @@ namespace Pinetime {
       using Location = std::array<char, 33>;  // 32 char + \0 (end of string)
       struct CurrentWeather {
         CurrentWeather(uint64_t timestamp,
-                       uint8_t temperature,
+                       int16_t temperature,
-                       uint8_t minTemperature,
+                       int16_t minTemperature,
-                       uint8_t maxTemperature,
+                       int16_t maxTemperature,
                        Icons iconId,
                        Location&& location)
           : timestamp {timestamp},
@@ -78,9 +78,9 @@ namespace Pinetime {
         }
 
         uint64_t timestamp;
-        uint8_t temperature;
+        int16_t temperature;
-        uint8_t minTemperature;
+        int16_t minTemperature;
-        uint8_t maxTemperature;
+        int16_t maxTemperature;
         Icons iconId;
         Location location;
 
@@ -92,8 +92,8 @@ namespace Pinetime {
         uint8_t nbDays;
 
         struct Day {
-          uint8_t minTemperature;
+          int16_t minTemperature;
-          uint8_t maxTemperature;
+          int16_t maxTemperature;
           Icons iconId;
         };
 

src/displayapp/screens/WatchFacePineTimeStyle.cpp

@@ -543,7 +543,7 @@ void WatchFacePineTimeStyle::Refresh() {
   if (currentWeather.IsUpdated()) {
     auto optCurrentWeather = currentWeather.Get();
     if (optCurrentWeather) {
-      lv_label_set_text_fmt(temperature, "%d°", optCurrentWeather->temperature);
+      lv_label_set_text_fmt(temperature, "%d°", (optCurrentWeather->temperature)/100);
       lv_label_set_text(weatherIcon, Symbols::GetSymbol(optCurrentWeather->iconId));
       lv_obj_realign(temperature);
       lv_obj_realign(weatherIcon);