feat(ws-s3-lcd-1-47): Update backlight to be initialized by LCD instead of display

components/ws-s3-lcd-1-47/include/ws-s3-lcd-1-47.hpp

@@ -16,6 +16,7 @@
 
 #include "base_component.hpp"
 #include "interrupt.hpp"
+#include "led.hpp"
 #include "neopixel.hpp"
 #include "st7789.hpp"
 
@@ -105,10 +106,12 @@ class WsS3Lcd147 : public BaseComponent {
 
   /// Set the brightness of the backlight
   /// \param brightness The brightness of the backlight as a percentage (0 - 100)
+  /// \note This function will only work after initialize_lcd() has been called
   void brightness(float brightness);
 
   /// Get the brightness of the backlight
   /// \return The brightness of the backlight as a percentage (0 - 100)
+  /// \note This function will only work after initialize_lcd() has been called
   float brightness() const;
 
   /// Get the VRAM 0 pointer (DMA memory used by LVGL)
@@ -284,6 +287,8 @@ class WsS3Lcd147 : public BaseComponent {
 
   // display
   std::shared_ptr<Display<Pixel>> display_;
+  std::vector<Led::ChannelConfig> backlight_channel_configs_{};
+  std::shared_ptr<Led> backlight_{};
   /// SPI bus for communication with the LCD
   spi_bus_config_t lcd_spi_bus_config_;
   spi_device_interface_config_t lcd_config_;

components/ws-s3-lcd-1-47/src/ws-s3-lcd-1-47.cpp

@@ -69,13 +69,26 @@ static void IRAM_ATTR lcd_spi_post_transfer_callback(spi_transaction_t *t) {
 }
 
 bool WsS3Lcd147::initialize_lcd() {
-  if (lcd_handle_) {
+  if (lcd_handle_ || backlight_) {
     logger_.warn("LCD already initialized, not initializing again!");
     return false;
   }
 
   logger_.info("Initializing LCD...");
 
+  // Initialize backlight PWM (moved out of Display, like esp-box)
+  backlight_channel_configs_.push_back({.gpio = static_cast<size_t>(backlight_io),
+                                        .channel = LEDC_CHANNEL_0,
+                                        .timer = LEDC_TIMER_0,
+                                        .output_invert = !backlight_value});
+
+  backlight_ = std::make_shared<Led>((Led::Config{.timer = LEDC_TIMER_0,
+                                                  .frequency_hz = 5000,
+                                                  .channels = backlight_channel_configs_,
+                                                  .duty_resolution = LEDC_TIMER_10_BIT}));
+  // default 100%
+  brightness(100.0f);
+
   esp_err_t ret;
 
   memset(&lcd_spi_bus_config_, 0, sizeof(lcd_spi_bus_config_));
@@ -139,8 +152,9 @@ bool WsS3Lcd147::initialize_display(size_t pixel_buffer_size) {
                                  .flush_callback = DisplayDriver::flush,
                                  .rotation_callback = DisplayDriver::rotate,
                                  .rotation = rotation},
-      Display<Pixel>::LcdConfig{.backlight_pin = backlight_io,
-                                .backlight_on_value = backlight_value},
+      Display<Pixel>::OledConfig{
+          .set_brightness_callback = [this](float brightness) { this->brightness(brightness); },
+          .get_brightness_callback = [this]() { return this->brightness(); }},
       Display<Pixel>::DynamicMemoryConfig{
           .pixel_buffer_size = pixel_buffer_size,
           .double_buffered = true,
@@ -304,14 +318,18 @@ uint8_t *WsS3Lcd147::frame_buffer0() const { return frame_buffer0_; }
 uint8_t *WsS3Lcd147::frame_buffer1() const { return frame_buffer1_; }
 
 void WsS3Lcd147::brightness(float brightness) {
-  brightness = std::clamp(brightness, 0.0f, 100.0f) / 100.0f;
-  // display expects a value between 0 and 1
-  display_->set_brightness(brightness);
+  brightness = std::clamp(brightness, 0.0f, 100.0f);
+  if (backlight_)
+    backlight_->set_duty(backlight_channel_configs_[0].channel, brightness);
 }
 
 float WsS3Lcd147::brightness() const {
-  // display returns a value between 0 and 1
-  return display_->get_brightness() * 100.0f;
+  if (backlight_) {
+    auto d = backlight_->get_duty(backlight_channel_configs_[0].channel);
+    if (d.has_value())
+      return d.value();
+  }
+  return 0.0f;
 }
 
 /////////////////////////////////////////////////////////////////////////////