Refactor backlight control and update display configuration in Cat Medication Tracker

esphome/cat-medication-tracker.yaml

@@ -12,13 +12,12 @@ esphome:
   on_boot:
     priority: 100
     then:
+      # Force backlight on after a short delay so we can confirm it is wired correctly.
+      - light.turn_off: backlight
+      - delay: 300ms
       - light.turn_on: backlight
-      - delay: 500ms
+      - delay: 300ms
       - component.update: my_display
-      
-psram:
-  # Enable external RAM for large TFT framebuffer usage if available.
-  # With no PSRAM module present, this is a no-op.
 
 esp32:
   board: esp32dev
@@ -69,6 +68,8 @@ spi:
     clk_pin: GPIO14
     mosi_pin: GPIO13
     miso_pin: GPIO12
+    # Set bus rate here to ensure the TFT doesn't run too fast at startup.
+    frequency: 20MHz
 
 # ILI9488 Display (3.5" 320x480, portrait)
 display:
@@ -79,9 +80,8 @@ display:
     dc_pin: GPIO2
     reset_pin: GPIO4
     rotation: 0
-    invert_colors: false
+    invert_colors: true
     color_order: bgr
-    data_rate: 20MHz
     dimensions:
       width: 320
       height: 480
@@ -223,7 +223,7 @@ output:
   - platform: gpio
     pin: GPIO21
     id: backlight_pwm
-    inverted: true
+    inverted: false
 
 light:
   - platform: binary