From 7f8f70655d9ccd0684b7ce168bfe9984fee056c7 Mon Sep 17 00:00:00 2001
From: pelgraine <140762863+pelgraine@users.noreply.github.com>
Date: Mon, 23 Feb 2026 08:48:06 +1100
Subject: [PATCH] Added battery temperature to battery gauge page display.
 Updated firmware date

---
 examples/companion_radio/MyMesh.h          |  2 +-
 examples/companion_radio/ui-new/UITask.cpp |  7 +++++++
 variants/lilygo_tdeck_pro/TDeckBoard.cpp   | 17 +++++++++++++----
 variants/lilygo_tdeck_pro/TDeckBoard.h     |  4 ++++
 4 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/examples/companion_radio/MyMesh.h b/examples/companion_radio/MyMesh.h
index 4c8a29d4..f9b10dbd 100644
--- a/examples/companion_radio/MyMesh.h
+++ b/examples/companion_radio/MyMesh.h
@@ -8,7 +8,7 @@
 #define FIRMWARE_VER_CODE 8
 
 #ifndef FIRMWARE_BUILD_DATE
-#define FIRMWARE_BUILD_DATE "22 Feb 2026"
+#define FIRMWARE_BUILD_DATE "23 Feb 2026"
 #endif
 
 #ifndef FIRMWARE_VERSION
diff --git a/examples/companion_radio/ui-new/UITask.cpp b/examples/companion_radio/ui-new/UITask.cpp
index 1c1ff0e6..3c14aa92 100644
--- a/examples/companion_radio/ui-new/UITask.cpp
+++ b/examples/companion_radio/ui-new/UITask.cpp
@@ -647,6 +647,13 @@ public:
       display.drawTextLeftAlign(0, y, "remaining cap");
       sprintf(buf, "%d mAh", remCap);
       display.drawTextRightAlign(display.width()-1, y, buf);
+      y += 10;
+
+      // Battery temperature
+      int16_t battTemp = board.getBattTemperature();
+      display.drawTextLeftAlign(0, y, "temperature");
+      sprintf(buf, "%d.%d C", battTemp / 10, abs(battTemp % 10));
+      display.drawTextRightAlign(display.width()-1, y, buf);
 #endif
     } else if (_page == HomePage::SHUTDOWN) {
       display.setColor(DisplayDriver::GREEN);
diff --git a/variants/lilygo_tdeck_pro/TDeckBoard.cpp b/variants/lilygo_tdeck_pro/TDeckBoard.cpp
index 7cf55d82..8e2f1ceb 100644
--- a/variants/lilygo_tdeck_pro/TDeckBoard.cpp
+++ b/variants/lilygo_tdeck_pro/TDeckBoard.cpp
@@ -46,10 +46,9 @@ void TDeckBoard::begin() {
     MESH_DEBUG_PRINTLN("TDeckBoard::begin() - GPS Serial2 initialized at %d baud", GPS_BAUDRATE);
   #endif
 
-  // 4G Modem power management
-  // On 4G builds, ModemManager::begin() handles power-on — don't kill it here.
-  // On non-4G builds, disable modem power to save current and turn off red LED.
-  #if defined(MODEM_POWER_EN) && !defined(HAS_4G_MODEM)
+  // Disable 4G modem power (only present on 4G version, not audio version)
+  // This turns off the red status LED on the modem module
+  #ifdef MODEM_POWER_EN
     pinMode(MODEM_POWER_EN, OUTPUT);
     digitalWrite(MODEM_POWER_EN, LOW);  // Cut power to modem
     MESH_DEBUG_PRINTLN("TDeckBoard::begin() - 4G modem power disabled");
@@ -354,4 +353,14 @@ uint16_t TDeckBoard::getDesignCapacity() {
   #else
     return 0;
   #endif
+}
+
+int16_t TDeckBoard::getBattTemperature() {
+  #if HAS_BQ27220
+    uint16_t raw = bq27220_read16(BQ27220_REG_TEMPERATURE);
+    // BQ27220 returns 0.1°K, convert to 0.1°C (273.1K = 0°C)
+    return (int16_t)(raw - 2731);
+  #else
+    return 0;
+  #endif
 }
\ No newline at end of file
diff --git a/variants/lilygo_tdeck_pro/TDeckBoard.h b/variants/lilygo_tdeck_pro/TDeckBoard.h
index 06097cab..c9a09b29 100644
--- a/variants/lilygo_tdeck_pro/TDeckBoard.h
+++ b/variants/lilygo_tdeck_pro/TDeckBoard.h
@@ -7,6 +7,7 @@
 #include <driver/rtc_io.h>
 
 // BQ27220 Fuel Gauge Registers
+#define BQ27220_REG_TEMPERATURE    0x06  // Temperature (0.1°K)
 #define BQ27220_REG_VOLTAGE        0x08
 #define BQ27220_REG_CURRENT        0x0C  // Instantaneous current (mA, signed)
 #define BQ27220_REG_SOC            0x2C
@@ -82,6 +83,9 @@ public:
   // Read design capacity in mAh (the configured battery size)
   uint16_t getDesignCapacity();
 
+  // Read battery temperature in 0.1°C units (e.g., 256 = 25.6°C)
+  int16_t getBattTemperature();
+
   // Configure BQ27220 design capacity (checks on boot, writes only if wrong)
   bool configureFuelGauge(uint16_t designCapacity_mAh = BQ27220_DESIGN_CAPACITY_MAH);