samples: matter: Fix temperaure units in temperature sensor

The temperature value must be multiplied by 100 to get the proper
Matter unit.

Signed-off-by: Arkadiusz Balys <[email protected]>

Author: ArekBalysNordic

samples/matter/temperature_sensor/README.rst

@@ -147,6 +147,9 @@ After building the sample and programming it to your development kit, complete t
 .. note::
    The following steps use the CHIP Tool controller as an example.
 
+   The temperature measurement value is multiplied by 100 to achieve the resolution of 0.01 degrees Celsius.
+   For example, 1252 means 12.52 degrees Celsius.
+
 .. tabs::
 
    .. group-tab:: nRF52 and nRF53 DKs
@@ -180,7 +183,7 @@ After building the sample and programming it to your development kit, complete t
          .. code-block:: console
 
             [1755081048.320] [99348:99350] [TOO] Endpoint: 1 Cluster: 0x0000_0402 Attribute 0x0000_0000 DataVersion: 1994139940
-            [1755081048.320] [99348:99350] [TOO]   MeasuredValue: 12
+            [1755081048.320] [99348:99350] [TOO]   MeasuredValue: 1200
 
    .. group-tab:: nRF54 DKs
 
@@ -200,7 +203,7 @@ After building the sample and programming it to your development kit, complete t
          .. code-block:: console
 
             [1755081048.320] [99348:99350] [TOO] Endpoint: 1 Cluster: 0x0000_0402 Attribute 0x0000_0000 DataVersion: 1994139940
-            [1755081048.320] [99348:99350] [TOO]   MeasuredValue: 9
+            [1755081048.320] [99348:99350] [TOO]   MeasuredValue: 900
 
       #. Wait some time, for example 30 s, and read the measured temperature again using the same command as before:
 
@@ -213,7 +216,7 @@ After building the sample and programming it to your development kit, complete t
          .. code-block:: console
 
             [1755081048.320] [99348:99350] [TOO] Endpoint: 1 Cluster: 0x0000_0402 Attribute 0x0000_0000 DataVersion: 1994139940
-            [1755081048.320] [99348:99350] [TOO]   MeasuredValue: 12
+            [1755081048.320] [99348:99350] [TOO]   MeasuredValue: 1200
 
 .. _matter_temperature_sensor_sample_remote_control:
 

samples/matter/temperature_sensor/src/app_task.h

@@ -26,11 +26,13 @@ class AppTask {
 
 	static constexpr chip::EndpointId kTemperatureSensorEndpointId = 1;
 
+	/* Defined by cluster temperature measured value = 100 x temperature in degC with resolution of
+	 * 0.01 degC. */
 	void UpdateTemperatureMeasurement()
 	{
 		/* Linear temperature increase that is wrapped around to min value after reaching the max value. */
 		if (mCurrentTemperature < mTemperatureSensorMaxValue) {
-			mCurrentTemperature++;
+			mCurrentTemperature += kTemperatureMeasurementStep;
 		} else {
 			mCurrentTemperature = mTemperatureSensorMinValue;
 		}
@@ -42,7 +44,8 @@ class AppTask {
 	CHIP_ERROR Init();
 	k_timer mTimer;
 
-	static constexpr uint16_t kTemperatureMeasurementIntervalMs = 10000;
+	static constexpr uint16_t kTemperatureMeasurementIntervalMs = 10000; /* 10 seconds */
+	static constexpr uint16_t kTemperatureMeasurementStep = 100; /* 1 degree Celsius */
 
 	static void UpdateTemperatureTimeoutCallback(k_timer *timer);
 

samples/matter/temperature_sensor/src/default_zap/temperature_sensor.matter

@@ -2470,8 +2470,8 @@ endpoint 1 {
 
   server cluster TemperatureMeasurement {
     ram      attribute measuredValue;
-    ram      attribute minMeasuredValue default = -20;
-    ram      attribute maxMeasuredValue default = 20;
+    ram      attribute minMeasuredValue default = -2000;
+    ram      attribute maxMeasuredValue default = 2000;
     callback attribute generatedCommandList;
     callback attribute acceptedCommandList;
     callback attribute attributeList;

samples/matter/temperature_sensor/src/default_zap/temperature_sensor.zap

@@ -4594,7 +4594,7 @@
               "storageOption": "RAM",
               "singleton": 0,
               "bounded": 0,
-              "defaultValue": "-20",
+              "defaultValue": "-2000",
               "reportable": 1,
               "minInterval": 1,
               "maxInterval": 65534,
@@ -4610,7 +4610,7 @@
               "storageOption": "RAM",
               "singleton": 0,
               "bounded": 0,
-              "defaultValue": "20",
+              "defaultValue": "2000",
               "reportable": 1,
               "minInterval": 1,
               "maxInterval": 65534,

samples/matter/temperature_sensor/src/default_zap/zap-generated/endpoint_config.h

@@ -558,10 +558,10 @@
 		/* Endpoint: 1, Cluster: Temperature Measurement (server) */                                                                         \
 		{ ZAP_EMPTY_DEFAULT(), 0x00000000, 2, ZAP_TYPE(TEMPERATURE), ZAP_ATTRIBUTE_MASK(NULLABLE) }, /* MeasuredValue                        \
 													      */                                     \
-		{ ZAP_SIMPLE_DEFAULT(-20), 0x00000001, 2, ZAP_TYPE(TEMPERATURE), ZAP_ATTRIBUTE_MASK(NULLABLE) }, /* MinMeasuredValue                 \
-														  */                                 \
-		{ ZAP_SIMPLE_DEFAULT(20), 0x00000002, 2, ZAP_TYPE(TEMPERATURE), ZAP_ATTRIBUTE_MASK(NULLABLE) }, /* MaxMeasuredValue                  \
-														 */                                  \
+		{ ZAP_SIMPLE_DEFAULT(-2000), 0x00000001, 2, ZAP_TYPE(TEMPERATURE),                                                                   \
+		  ZAP_ATTRIBUTE_MASK(NULLABLE) }, /* MinMeasuredValue */                                                                             \
+		{ ZAP_SIMPLE_DEFAULT(2000), 0x00000002, 2, ZAP_TYPE(TEMPERATURE),                                                                    \
+		  ZAP_ATTRIBUTE_MASK(NULLABLE) }, /* MaxMeasuredValue */                                                                             \
 		{ ZAP_SIMPLE_DEFAULT(0), 0x0000FFFC, 4, ZAP_TYPE(BITMAP32), 0 }, /* FeatureMap */                                                    \
 		{ ZAP_SIMPLE_DEFAULT(4), 0x0000FFFD, 2, ZAP_TYPE(INT16U), 0 }, /* ClusterRevision */                                                 \
 	}