enable MCU temp for ESP

docs/ARCHITECTURE.md

@@ -858,7 +858,7 @@ Repeaters and room servers default to `CONFIG_ZEPHCORE_REPEATER_GPS_INTERVAL_SEC
 - `powerOff()` (CLI `poweroff`/`shutdown`, UI power-off, low-battery shutdown all end in `zephcore_power_off()`, `board/zephyr_poweroff.c`): UI hook (heartbeat, display), GPS/sensor/buzzer rails off, LoRa held in reset, sw0 SENSE armed (nRF), power latch released, System OFF
 - Upstream's pwrmgt getters: reset cause from `boot_info`, the last fatal error from `fatal_reboot.c`'s `__noinit` record (reason, pc, lr, thread; resolve pc with `addr2line` on the same build), shutdown reason from the `/lfs/shutdn` marker, battery voltage at boot
 
-**Telemetry** (`REQ_TYPE_GET_TELEMETRY_DATA`, every role, upstream's shape): battery on channel 1, then `sensors.querySensors()` (`adapters/sensors/ZephyrSensorManager.cpp`): GPS position on channel 1 while the GPS is on and has a fix, each environment sensor and power-monitor channel found at boot on its own channel from 2 up (probe order), board-local analog sensors (T1000-E) on channel 1; then the MCU temperature on channel 1. Servers give guests battery + MCU temperature only and honour the requester's inverse permission mask, as upstream. Encoded by `helpers/compat/CayenneLPP.h`: upstream's library API and wire format, but values round to the nearest step where the library truncates.
+**Telemetry** (`REQ_TYPE_GET_TELEMETRY_DATA`, every role, upstream's shape): battery on channel 1, then `sensors.querySensors()` (`adapters/sensors/ZephyrSensorManager.cpp`): GPS position on channel 1 while the GPS is on and has a fix, each environment sensor and power-monitor channel found at boot on its own channel from 2 up (probe order), board-local analog sensors (T1000-E) on channel 1; then the MCU temperature on channel 1 (the SoC's die sensor: the `die-temp0` alias, which is `coretemp` on ESP32-S3/C3/C6, else the Nordic nodelabel `temp`; omitted where there is none: classic ESP32, STM32WL, MG24). Servers give guests battery + MCU temperature only and honour the requester's inverse permission mask, as upstream. Encoded by `helpers/compat/CayenneLPP.h`: upstream's library API and wire format, but values round to the nearest step where the library truncates.
 
 **Clock** (`adapters/clock/ZephyrRTCClock`): `setCurrentTime()` also writes the hardware RTC when the board has one (coalesced on the system work queue; a time outside 2000-2099 is not written), as upstream's `AutoDiscoverRTCClock` writes its chip; `seedCurrentTime()` is the boot restore, not written back. A chip is adopted at boot only once it is identified (`adapters/clock/ZephyrRTCDiscover.c`), because other parts can answer at the same address: a device is passed over when two reads each show a bit set that the chip's data sheet fixes at zero, or a time field out of range, and a time is restored only from a read in which every field is valid. An RV-3028 cleanly identified in 12-hour mode has its `twelve-hour-bit` cleared first, so the chip converts its own hours. No time is taken from a cleanly identified RV-3028 whose `twelve-hour-bit` register cannot be read or reads FFh, or whose clear or re-read fails. The time is written in each chip's own encoding (the RX8130CE takes a one-hot weekday, `weekday-one-hot` in its descriptor), and an RV-3028 whose descriptor carries `rv3028-eeprom-config` (the RAK12002 on a RAK4631) has that configuration, its backup switchover, stored in the chip's EEPROM. Without a hardware RTC, the last time read is kept in no-init memory (RTC slow memory on ESP32) and restored after a reset that keeps RAM (reboot, crash, watchdog), as upstream's `ESP32RTCClock`; a power cycle starts from 1970 again.
 

releasenotes/RELEASE_NOTES_1.17.7-zephcore.md

@@ -175,6 +175,11 @@ matches the SoftDevice version of your bootloader.
   puts it back to 47 hours.
 - **Malformed encrypted packets are rejected earlier**, before any cryptography runs.
 - **Large contact lists**: up to 24 contacts can share the same one-byte hash, up from 8.
+- **ESP32-S3, ESP32-C3 and ESP32-C6 boards report the MCU temperature** in telemetry, as nRF52 boards
+  already did ([#107](https://github.com/liquidraver/ZephCore/issues/107), thanks to **svenlange2**).
+  The older ESP32 in the TTGO LoRa32 and T-Beam has no usable sensor and still reports none. On the
+  ThinkNode M9 and Meshnology W12 the radio now also recalibrates itself when the temperature has
+  moved by 5 C or more, as it already does on nRF boards with an LR1110 or LR2021.
 - **`sensor list`** with a negative start index is rejected instead of being used
   ([PR #100](https://github.com/liquidraver/ZephCore/pull/100), thanks to **ptr727**).
 - **T1000-E**: a pin that was wrongly driven as a sensor enable is left alone. Sensor readings are

zephcore/CMakeLists.txt

@@ -181,6 +181,13 @@ if(ZEPHCORE_PLATFORM STREQUAL "esp32")
         message(STATUS "  ESP32 CPU: 80 MHz (observers keep the SoC maximum)")
     endif()
 
+    # SoC temperature sensor (MCU temperature in telemetry, image-calibration
+    # drift on LR11xx/LR2021): every role, every SoC that has the node. The
+    # classic ESP32 (".../esp32/...") has neither the node nor a driver.
+    if(NOT BOARD MATCHES "/esp32/")
+        zephcore_add_overlay(${_zc}/esp32_coretemp.overlay)
+    endif()
+
     # Light sleep: REPEATERS on boards that declare it. 80 MHz cuts the idle draw;
     # light sleep is what removes it (mechanism and requirements:
     # boards/common/pm_esp32.conf). Repeaters only: the Espressif HCI driver takes

zephcore/adapters/board/ZephyrBoard.cpp

@@ -368,9 +368,14 @@ float ZephyrBoard::getAdcMultiplier() const
 
 float ZephyrBoard::getMCUTemperature()
 {
-	/* nRF52840 die temperature sensor - "nordic,nrf-temp" at 0x4000c000
-	 * Nodelabel "temp" is defined in nrf52840.dtsi, status="okay" by default */
+	/* SoC die temperature sensor: the `die-temp0` alias where the SoC dtsi
+	 * declares one (Espressif `coretemp`), else the nodelabel `temp` (Nordic).
+	 * NULL when the node is absent or disabled. */
+#if DT_NODE_EXISTS(DT_ALIAS(die_temp0))
+	const struct device *dev = DEVICE_DT_GET_OR_NULL(DT_ALIAS(die_temp0));
+#else
 	const struct device *dev = DEVICE_DT_GET_OR_NULL(DT_NODELABEL(temp));
+#endif
 	if (!dev || !device_is_ready(dev)) {
 		return NAN;
 	}

zephcore/boards/common/esp32_coretemp.overlay

@@ -0,0 +1,16 @@
+/*
+ * SPDX-License-Identifier: MIT
+ * ESP32-S3 / C3 / C6: enable the SoC's internal temperature sensor.
+ *
+ * Every Espressif SoC dtsi that has the sensor declares it as `coretemp`,
+ * disabled, behind the alias `die-temp0`. Enabling the node is all it takes:
+ * CONFIG_ESP32_TEMP defaults on with it, and ZephyrBoard::getMCUTemperature()
+ * finds it through the alias.
+ *
+ * Not for the classic ESP32, which has no such node (a reference to &coretemp
+ * is a dtc error there) and no driver. CMakeLists.txt skips it for that SoC.
+ */
+
+&coretemp {
+	status = "okay";
+};