From ee4e87c3ee545821a9b017e73525a3f943d9f2ba Mon Sep 17 00:00:00 2001
From: Florent <florent@frizoncorrea.fr>
Date: Fri, 28 Nov 2025 10:33:19 +0100
Subject: [PATCH] thinknode_m5: manage baclight

---
 examples/companion_radio/ui-new/UITask.cpp | 6 +++++-
 src/helpers/ui/GxEPDDisplay.cpp            | 9 +++++++++
 variants/thinknode_m5/ThinknodeM5Board.cpp | 3 +--
 variants/thinknode_m5/platformio.ini       | 3 +++
 variants/thinknode_m5/target.cpp           | 2 --
 5 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/examples/companion_radio/ui-new/UITask.cpp b/examples/companion_radio/ui-new/UITask.cpp
index 16751d20..fe26277f 100644
--- a/examples/companion_radio/ui-new/UITask.cpp
+++ b/examples/companion_radio/ui-new/UITask.cpp
@@ -716,10 +716,14 @@ void UITask::loop() {
     _analogue_pin_read_millis = millis();
   }
 #endif
-#if defined(DISP_BACKLIGHT) && defined(BACKLIGHT_BTN)
+#if defined(BACKLIGHT_BTN)
   if (millis() > next_backlight_btn_check) {
     bool touch_state = digitalRead(PIN_BUTTON2);
+#if defined(DISP_BACKLIGHT)
     digitalWrite(DISP_BACKLIGHT, !touch_state);
+#elif defined(EXP_PIN_BACKLIGHT)
+    expander.digitalWrite(EXP_PIN_BACKLIGHT, !touch_state);
+#endif
     next_backlight_btn_check = millis() + 300;
   }
 #endif
diff --git a/src/helpers/ui/GxEPDDisplay.cpp b/src/helpers/ui/GxEPDDisplay.cpp
index a8a9b209..ad47754b 100644
--- a/src/helpers/ui/GxEPDDisplay.cpp
+++ b/src/helpers/ui/GxEPDDisplay.cpp
@@ -1,6 +1,11 @@
 
 #include "GxEPDDisplay.h"
 
+#ifdef EXP_PIN_BACKLIGHT
+  #include <PCA9557.h>
+  extern PCA9557 expander;
+#endif
+
 #ifndef DISPLAY_ROTATION
   #define DISPLAY_ROTATION 3
 #endif
@@ -35,6 +40,8 @@ void GxEPDDisplay::turnOn() {
   if (!_init) begin();
 #if defined(DISP_BACKLIGHT) && !defined(BACKLIGHT_BTN)
   digitalWrite(DISP_BACKLIGHT, HIGH);
+#elif defined(EXP_PIN_BACKLIGHT) && !defined(BACKLIGHT_BTN)
+  expander.digitalWrite(EXP_PIN_BACKLIGHT, HIGH);
 #endif
   _isOn = true;
 }
@@ -42,6 +49,8 @@ void GxEPDDisplay::turnOn() {
 void GxEPDDisplay::turnOff() {
 #if defined(DISP_BACKLIGHT) && !defined(BACKLIGHT_BTN)
   digitalWrite(DISP_BACKLIGHT, LOW);
+#elif defined(EXP_PIN_BACKLIGHT) && !defined(BACKLIGHT_BTN)
+  expander.digitalWrite(EXP_PIN_BACKLIGHT, LOW);
 #endif
   _isOn = false;
 }
diff --git a/variants/thinknode_m5/ThinknodeM5Board.cpp b/variants/thinknode_m5/ThinknodeM5Board.cpp
index f178caad..916f4483 100644
--- a/variants/thinknode_m5/ThinknodeM5Board.cpp
+++ b/variants/thinknode_m5/ThinknodeM5Board.cpp
@@ -3,7 +3,7 @@
 PCA9557 expander (0x18, &Wire1);
 
 void ThinknodeM5Board::begin() {
-    // Start expander
+    // Start expander and configure pins
     Wire1.begin(48, 47);
     expander.pinMode(EXP_PIN_POWER, OUTPUT); // eink
     expander.pinMode(EXP_PIN_BACKLIGHT, OUTPUT); // peripherals
@@ -11,7 +11,6 @@ void ThinknodeM5Board::begin() {
     expander.digitalWrite(EXP_PIN_POWER, HIGH);
     expander.digitalWrite(EXP_PIN_BACKLIGHT, LOW);
     expander.digitalWrite(EXP_PIN_LED, LOW);
-
     ESP32Board::begin();
   }
 
diff --git a/variants/thinknode_m5/platformio.ini b/variants/thinknode_m5/platformio.ini
index 11f56377..353a9c52 100644
--- a/variants/thinknode_m5/platformio.ini
+++ b/variants/thinknode_m5/platformio.ini
@@ -18,6 +18,7 @@ build_flags = ${esp32_base.build_flags}
   -D P_LORA_MISO=7
   -D P_LORA_MOSI=15
   -D PIN_USER_BTN=21
+  -D PIN_BUTTON2=14
   -D EXP_PIN_LED=1
 #  -D PIN_STATUS_LED=1   ; leds are on PCA !!!
 #  -D LED_STATE_ON=HIGH
@@ -29,6 +30,8 @@ build_flags = ${esp32_base.build_flags}
   -D EINK_SCALE_Y=1.5625f
   -D EINK_X_OFFSET=0
   -D EINK_Y_OFFSET=10
+  -D BACKLIGHT_BTN=PIN_BUTTON2
+  -D AUTO_OFF_MILLIS=0
   -D SX126X_DIO2_AS_RF_SWITCH=true
   -D SX126X_DIO3_TCXO_VOLTAGE=3.3
   -D SX126X_CURRENT_LIMIT=140
diff --git a/variants/thinknode_m5/target.cpp b/variants/thinknode_m5/target.cpp
index fdc5ca7a..fa559610 100644
--- a/variants/thinknode_m5/target.cpp
+++ b/variants/thinknode_m5/target.cpp
@@ -24,8 +24,6 @@ SensorManager sensors;
 bool radio_init() {
   fallback_clock.begin();
   rtc_clock.begin(Wire);
-//  pinMode(21, INPUT);
-//  pinMode(48, OUTPUT);
   pinMode(P_LORA_EN, OUTPUT);
   digitalWrite(P_LORA_EN, HIGH);
   #if defined(P_LORA_SCLK)