hwCPUTemperature for NRF5 implementation (#1423)

* Implement hwCPUTemperature for NRF5 chip

Get temperature via NRF_TEMP->TEMP

* Fix hwCPUTemperature

Change Temperature type to int32_t

* Implement address anomalies

* Replace wait with delay

Author: KooLru

hal/architecture/NRF5/MyHwNRF5.cpp

@@ -523,7 +523,34 @@ uint16_t hwCPUFrequency(void)
 
 int8_t hwCPUTemperature(void)
 {
-	return -127; // not implemented yet
+	int32_t volatile Temperature = 0;
+
+	nrf_temp_init();
+
+	for (byte i = 0; i < 10; i++) {
+
+		NRF_TEMP->TASKS_START = 1; /** Start the temperature measurement. */
+
+		/* Busy wait while temperature measurement is not finished, you can skip waiting if you enable interrupt for DATARDY event and read the result in the interrupt. */
+		/*lint -e{845} // A zero has been given as right argument to operator '|'" */
+		while (NRF_TEMP->EVENTS_DATARDY == 0) {
+			// Do nothing.
+		}
+
+		NRF_TEMP->EVENTS_DATARDY = 0;
+
+		/**@note Workaround for PAN_028 rev2.0A anomaly 29 - TEMP: Stop task clears the TEMP register. */
+		Temperature += nrf_temp_read();
+
+		/**@note Workaround for PAN_028 rev2.0A anomaly 30 - TEMP: Temp module analog front end does not power down when DATARDY event occurs. */
+		NRF_TEMP->TASKS_STOP = 1; /** Stop the temperature measurement. */
+
+		delay(10);
+	}
+
+	//10 values for average
+	//Temperature in degC (0.25deg steps)
+	return (int8_t)(Temperature / 40);
 }
 
 uint16_t hwFreeMem(void)