From 51bf7bcd7d454c1e813fb4415860e76d1b8efdff Mon Sep 17 00:00:00 2001
From: gemu2015 <gmutz2010@googlemail.com>
Date: Sat, 3 Oct 2020 18:31:40 +0200
Subject: [PATCH] ili9488 esp32 dimmer

---
 lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.cpp | 37 +++++++++++++++++--
 lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.h   |  3 +-
 2 files changed, 36 insertions(+), 4 deletions(-)

diff --git a/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.cpp b/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.cpp
index c7cdeba0a..357000a69 100644
--- a/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.cpp
+++ b/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.cpp
@@ -20,6 +20,11 @@
 
 // if using software spi this optimizes the code
 
+#ifdef ESP32
+#define ILI9488_DIMMER
+#undef ESP32_PWM_CHANNEL
+#define ESP32_PWM_CHANNEL 1
+#endif
 
 #define ILI9488_START start();
 #define ILI9488_STOP stop();
@@ -322,8 +327,13 @@ void ILI9488::DisplayInit(int8_t p,int8_t size,int8_t rot,int8_t font) {
 void ILI9488::DisplayOnff(int8_t on) {
   if (on) {
     writecommand(ILI9488_DISPON);    //Display on
+
     if (_bp>=0) {
+  #ifdef ILI9488_DIMMER
+        ledcWrite(ESP32_PWM_CHANNEL,dimmer);
+  #else
       digitalWrite(_bp,HIGH);
+  #endif
       /*
       writecommand(ILI9488_WRCTRLD);
     	writedata(0x0c);
@@ -332,15 +342,30 @@ void ILI9488::DisplayOnff(int8_t on) {
     }
   } else {
     writecommand(ILI9488_DISPOFF);
+
     if (_bp>=0) {
+#ifdef ILI9488_DIMMER
+      ledcWrite(ESP32_PWM_CHANNEL,0);
+#else
       digitalWrite(_bp,LOW);
+#endif
+    }
       //writecommand(ILI9488_WRCTRLD);
     	//writedata(0x04);
-    }
+
   }
   ILI9488_STOP
 }
 
+// dimmer 0-100
+void ILI9488::dim(uint8_t dim) {
+  dimmer = dim;
+  if (dimmer>15) dimmer=15;
+  dimmer=((float)dimmer/15.0)*255.0;
+#ifdef ESP32
+  ledcWrite(ESP32_PWM_CHANNEL,dimmer);
+#endif
+}
 
 void ILI9488::begin(void) {
   pinMode(_cs, OUTPUT);
@@ -348,8 +373,14 @@ void ILI9488::begin(void) {
   pinMode(_sclk, OUTPUT);
   pinMode(_mosi, OUTPUT);
   if (_bp>=0) {
-    pinMode(_bp, OUTPUT);
-    digitalWrite(_bp,HIGH);
+#ifdef ILI9488_DIMMER
+      ledcSetup(ESP32_PWM_CHANNEL,4000,8);
+      ledcAttachPin(_bp,ESP32_PWM_CHANNEL);
+      ledcWrite(ESP32_PWM_CHANNEL,128);
+#else
+      pinMode(_bp, OUTPUT);
+      digitalWrite(_bp,HIGH);
+#endif
   }
 
 #ifndef ESP32
diff --git a/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.h b/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.h
index 89c7a909b..5fd2e39e5 100644
--- a/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.h
+++ b/lib/JaretBurkett_ILI9488-gemu-1.0/ILI9488.h
@@ -157,10 +157,11 @@ class ILI9488 : public Renderer {
   void write16BitColor(uint16_t color);
   void commandList(uint8_t *addr);
   void hw_spi_init();
-
+  void dim(uint8_t contrast);
 
  private:
   uint8_t  tabcolor;
+  uint8_t dimmer;
   void fastSPIwrite(uint8_t d,uint8_t dc);
   void spi_lcd_mode_init(void);
   void start(void);