Merge the three redundant backlight enables into the single TFT_BL flag

src/graphics/TFTDisplay.cpp

@@ -21,10 +21,6 @@ extern SX1509 gpioExtender;
 #if defined(ST7735S)
 #include <LovyanGFX.hpp> // Graphics and font library for ST7735 driver chip
 
-#if defined(ST7735_BACKLIGHT_EN) && !defined(TFT_BL)
-#define TFT_BL ST7735_BACKLIGHT_EN
-#endif
-
 #ifndef TFT_INVERT
 #define TFT_INVERT true
 #endif
@@ -91,11 +87,12 @@ class LGFX : public lgfx::LGFX_Device
             _panel_instance.config(cfg);
         }
 
+#ifdef TFT_BL
         // Set the backlight control
         {
             auto cfg = _light_instance.config(); // Gets a structure for backlight settings.
 
-            cfg.pin_bl = ST7735_BL; // Pin number to which the backlight is connected
+            cfg.pin_bl = TFT_BL; // Pin number to which the backlight is connected
             cfg.invert = true;   // true to invert the brightness of the backlight
             // cfg.freq = 44100;    // PWM frequency of backlight
             // cfg.pwm_channel = 1; // PWM channel number to use
@@ -103,6 +100,7 @@ class LGFX : public lgfx::LGFX_Device
             _light_instance.config(cfg);
             _panel_instance.setLight(&_light_instance); // Set the backlight on the panel.
         }
+#endif
 
         setPanel(&_panel_instance);
     }
@@ -575,14 +573,12 @@ void TFTDisplay::sendCommand(uint8_t com)
         display(true);
         if (settingsMap[displayBacklight] > 0)
             digitalWrite(settingsMap[displayBacklight], TFT_BACKLIGHT_ON);
-#elif defined(ST7735_BL)
+#elif defined(TFT_BL) && defined(TFT_BACKLIGHT_ON)
-        pinMode(ST7735_BL, OUTPUT);
+        pinMode(TFT_BL, OUTPUT);
-        digitalWrite(ST7735_BL, TFT_BACKLIGHT_ON);
+        digitalWrite(TFT_BL, TFT_BACKLIGHT_ON);
 #elif !defined(RAK14014) && !defined(M5STACK) && !defined(UNPHONE)
         tft->wakeup();
         tft->powerSaveOff();
-#elif defined(TFT_BL) && defined(TFT_BACKLIGHT_ON)
-        digitalWrite(TFT_BL, TFT_BACKLIGHT_ON);
 #endif
 
 #ifdef VTFT_CTRL_V03
@@ -606,14 +602,12 @@ void TFTDisplay::sendCommand(uint8_t com)
         tft->clear();
         if (settingsMap[displayBacklight] > 0)
             digitalWrite(settingsMap[displayBacklight], !TFT_BACKLIGHT_ON);
-#elif defined(ST7735_BL)
+#elif defined(TFT_BL) && defined(TFT_BACKLIGHT_ON)
-        pinMode(ST7735_BL, OUTPUT);
+        pinMode(TFT_BL, OUTPUT);
-        digitalWrite(ST7735_BL, !TFT_BACKLIGHT_ON);
+        digitalWrite(TFT_BL, !TFT_BACKLIGHT_ON);
 #elif !defined(RAK14014) && !defined(M5STACK) && !defined(UNPHONE)
         tft->sleep();
         tft->powerSaveOn();
-#elif defined(TFT_BL) && defined(TFT_BACKLIGHT_ON)
-        digitalWrite(TFT_BL, !TFT_BACKLIGHT_ON);
 #endif
 
 #ifdef VTFT_CTRL_V03
@@ -710,10 +704,6 @@ bool TFTDisplay::connect()
     LOG_INFO("Power to TFT Backlight\n");
 #endif
 
-#ifdef ST7735_BL
-    pinMode(ST7735_BL, OUTPUT);
-    digitalWrite(ST7735_BL, TFT_BACKLIGHT_ON);
-#endif
 #ifdef UNPHONE
     unphone.backlight(true); // using unPhone library
     LOG_INFO("Power to TFT Backlight\n");

variants/chatter2/variant.h

@@ -54,7 +54,7 @@
 #define ST7735_RESET 15
 #define ST7735_MISO -1
 #define ST7735_BUSY -1
-#define ST7735_BL 32
+#define TFT_BL 32
 #define ST7735_SPI_HOST HSPI_HOST // SPI2_HOST for S3, auto may work too
 #define SPI_FREQUENCY 40000000
 #define SPI_READ_FREQUENCY 16000000

variants/heltec_wireless_tracker/variant.h

@@ -15,7 +15,7 @@
 #define ST7735_RESET 39
 #define ST7735_MISO -1
 #define ST7735_BUSY -1
-#define ST7735_BL 21 /* V1.1 PCB marking */
+#define TFT_BL 21 /* V1.1 PCB marking */
 #define ST7735_SPI_HOST SPI3_HOST
 #define SPI_FREQUENCY 40000000
 #define SPI_READ_FREQUENCY 16000000

variants/heltec_wireless_tracker_V1_0/variant.h

@@ -15,7 +15,7 @@
 #define ST7735_RESET 39
 #define ST7735_MISO -1
 #define ST7735_BUSY -1
-#define ST7735_BL 45
+#define TFT_BL 45
 #define ST7735_SPI_HOST SPI3_HOST
 #define SPI_FREQUENCY 40000000
 #define SPI_READ_FREQUENCY 16000000

variants/lora_relay_v1/variant.h

@@ -144,7 +144,7 @@ static const uint8_t SCK = PIN_SPI_SCK;
 
 #define ST7735_RESET (11) // Output
 #define ST7735_CS (12)
-#define ST7735_BACKLIGHT_EN (13)
+#define TFT_BL (13)
 #define ST7735_RS (9)
 
 // #define LORA_DISABLE_SENDING // The board can brownout during lora TX if you don't have a battery connected.  Disable sending

variants/lora_relay_v2/variant.h

@@ -166,7 +166,7 @@ static const uint8_t SCK = PIN_SPI_SCK;
 // ST7565 SPI
 #define ST7735_RESET (11) // Output
 #define ST7735_CS (12)
-#define ST7735_BACKLIGHT_EN (13)
+#define TFT_BL (13)
 #define ST7735_RS (9)
 #define ST7735_SDA (39) // actually spi MOSI
 #define ST7735_SCK (37) // actually spi clk

variants/tracksenger/internal/variant.h

@@ -17,7 +17,7 @@
 #define ST7735_RESET 39
 #define ST7735_MISO -1
 #define ST7735_BUSY -1
-#define ST7735_BL 21 /* V1.1 PCB marking */
+#define TFT_BL 21 /* V1.1 PCB marking */
 #define ST7735_SPI_HOST SPI3_HOST
 #define SPI_FREQUENCY 40000000
 #define SPI_READ_FREQUENCY 16000000

variants/tracksenger/lcd/variant.h

@@ -16,7 +16,7 @@
 #define ST7789_CS 38
 #define ST7789_RS 40
 #define ST7789_BL 21
-// P#define ST7735_BL 21 /* V1.1 PCB marking */
+// P#define TFT_BL 21 /* V1.1 PCB marking */
 
 #define ST7789_RESET -1
 #define ST7789_MISO -1
@@ -41,7 +41,7 @@
 // #define ST7735_RESET 39
 // #define ST7735_MISO -1
 // #define ST7735_BUSY -1
-#define ST7735_BL 21 /* V1.1 PCB marking */
+#define TFT_BL 21 /* V1.1 PCB marking */
 // #define ST7735_SPI_HOST SPI3_HOST
 // #define SPI_FREQUENCY 40000000
 // #define SPI_READ_FREQUENCY 16000000

variants/tracksenger/oled/variant.h

@@ -19,7 +19,7 @@
 // #define ST7735_RESET 39
 // #define ST7735_MISO -1
 // #define ST7735_BUSY -1
-#define ST7735_BL 21 /* V1.1 PCB marking */
+#define TFT_BL 21 /* V1.1 PCB marking */
 // #define ST7735_SPI_HOST SPI3_HOST
 // #define SPI_FREQUENCY 40000000
 // #define SPI_READ_FREQUENCY 16000000