From f4dbfb295a3d2742b3bb3ab10d8c627b44a041fc Mon Sep 17 00:00:00 2001
From: fvanroie <15969459+fvanroie@users.noreply.github.com>
Date: Thu, 10 Feb 2022 02:18:07 +0100
Subject: [PATCH] Update PWM resolution for ESP32S2 #250

---
 src/dev/esp32/esp32.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/dev/esp32/esp32.cpp b/src/dev/esp32/esp32.cpp
index c9de5408..c030e0ce 100644
--- a/src/dev/esp32/esp32.cpp
+++ b/src/dev/esp32/esp32.cpp
@@ -185,7 +185,11 @@ void Esp32Device::set_backlight_pin(uint8_t pin)
     /* Setup Backlight Control Pin */
     if(pin < GPIO_NUM_MAX) {
         LOG_VERBOSE(TAG_GUI, F("Backlight  : Pin %d"), pin);
+#ifndef ESP32S2
         ledcSetup(BACKLIGHT_CHANNEL, 20000, 12);
+#else
+        ledcSetup(BACKLIGHT_CHANNEL, 20000, 10);
+#endif
         ledcAttachPin(pin, BACKLIGHT_CHANNEL);
         update_backlight();
     } else {
@@ -218,9 +222,15 @@ bool Esp32Device::get_backlight_power()
 void Esp32Device::update_backlight()
 {
     if(_backlight_pin < GPIO_NUM_MAX) {
+#ifndef ESP32S2
         uint32_t duty = _backlight_power ? map(_backlight_level, 0, 255, 0, 4095) : 0;
         if(_backlight_invert) duty = 4095 - duty;
         ledcWrite(BACKLIGHT_CHANNEL, duty); // ledChannel and value
+#else
+        uint32_t duty = _backlight_power ? map(_backlight_level, 0, 255, 0, 1023) : 0;
+        if(_backlight_invert) duty = 1023 - duty;
+        ledcWrite(BACKLIGHT_CHANNEL, duty); // ledChannel and value
+#endif
     }
 
     // haspTft.tft.writecommand(0x53); // Write CTRL Display