port adc.multiplier command

zephcore/adapters/board/ZephyrBoard.cpp

@@ -135,14 +135,41 @@ uint16_t ZephyrBoard::getBattMilliVolts()
 		return 0;
 	}
 	raw /= valid_samples;
-	uint16_t mv = (uint16_t)((VBAT_MV_MULTIPLIER * (int64_t)raw) / 4096);
-	LOG_DBG("Battery: raw=%d multiplier=%d mv=%u", (int)raw, VBAT_MV_MULTIPLIER, mv);
+	int64_t mult = (_adc_multiplier_override != 0.0f)
+		? (int64_t)_adc_multiplier_override
+		: (int64_t)VBAT_MV_MULTIPLIER;
+	uint16_t mv = (uint16_t)((mult * (int64_t)raw) / 4096);
+	LOG_DBG("Battery: raw=%d multiplier=%lld mv=%u", (int)raw, (long long)mult, mv);
 	return mv;
 #else
 	return 0;
 #endif
 }
 
+bool ZephyrBoard::setAdcMultiplier(float multiplier)
+{
+#if DT_NODE_EXISTS(DT_PATH(zephyr_user)) && \
+    DT_NODE_HAS_PROP(DT_PATH(zephyr_user), io_channels)
+	_adc_multiplier_override = multiplier;
+	return true;
+#else
+	(void)multiplier;
+	return false;
+#endif
+}
+
+float ZephyrBoard::getAdcMultiplier() const
+{
+#if DT_NODE_EXISTS(DT_PATH(zephyr_user)) && \
+    DT_NODE_HAS_PROP(DT_PATH(zephyr_user), io_channels)
+	return (_adc_multiplier_override != 0.0f)
+		? _adc_multiplier_override
+		: (float)VBAT_MV_MULTIPLIER;
+#else
+	return 0.0f;
+#endif
+}
+
 float ZephyrBoard::getMCUTemperature()
 {
 	/* nRF52840 die temperature sensor - "nordic,nrf-temp" at 0x4000c000

zephcore/adapters/board/ZephyrBoard.h

@@ -13,6 +13,8 @@ class ZephyrBoard : public MainBoard {
 public:
 	uint16_t getBattMilliVolts() override;
 	float getMCUTemperature() override;
+	bool setAdcMultiplier(float multiplier) override;
+	float getAdcMultiplier() const override;
 	const char *getManufacturerName() const override;
 	void onBeforeTransmit() override;
 	void onAfterTransmit() override;
@@ -22,6 +24,11 @@ public:
 	bool startOTAUpdate(const char *id, char reply[]) override;  /* Reboot into BLE OTA DFU */
 	void clearBootloaderMagic();      /* Clear stale GPREGRET values at startup */
 	uint8_t getStartupReason() const override;
+
+private:
+	/* Runtime override for vbat-mv-multiplier. Units match DT `vbat-mv-multiplier`
+	 * (mV scale such that `mv = multiplier * raw / 4096`). 0 = use DT default. */
+	float _adc_multiplier_override = 0.0f;
 };
 
 } /* namespace mesh */

zephcore/src/main_companion.cpp

@@ -669,6 +669,9 @@ int main(void)
 	lora_radio.setRxBoost(companion_mesh.prefs.rx_boost != 0);
 	lora_radio.enableRxDutyCycle(companion_mesh.prefs.rx_duty_cycle != 0);
 
+	/* Restore runtime ADC multiplier override (0 = keep DT default) */
+	zephyr_board.setAdcMultiplier(companion_mesh.prefs.adc_multiplier);
+
 	/* Initialize mesh event object */
 	k_event_init(&mesh_events);