fake brightness adjust (#1845)

* temp

* temp - 1

* next step note

* fix circuit dependency (to fix:can't read p.mem)

* fix circuit dependency (to fix:can't read p.mem)

* notes

* bitmap

* bitmap

* remove my stupid forward declearation

* clean up

* clean up

* level control

* clean up

* clean up

* clean up

* clean up

* format

* format

* format

* format

* format

* fix for comment advices

* fix for comment advices

* fix display issue in notepad app

* slightly increase performance...

* temp for grey_scale and high_constrast

* format

* note for cache implement

* fix for comment request

* fix for comment request

firmware/common/portapack_io.cpp

@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
+ * Copyleft (ɔ) 2024 zxkmm under GPL license
  *
  * This file is part of PortaPack.
  *
@@ -20,6 +21,7 @@
  */
 
 #include "portapack_io.hpp"
+#include "portapack_persistent_memory.hpp"
 
 #include "lpc43xx_cpp.hpp"
 using namespace lpc43xx;
@@ -75,6 +77,14 @@ void IO::reference_oscillator(const bool enable) {
     io_write(1, io_reg);
 }
 
+bool IO::get_dark_cover() {
+    return portapack::persistent_memory::apply_fake_brightness();
+}
+
+uint8_t IO::get_brightness() {
+    return portapack::persistent_memory::fake_brightness_level();
+}
+
 uint32_t IO::io_update(const TouchPinsConfig write_value) {
     /* Very touchy code to save context of PortaPack data bus while the
      * resistive touch pin drive is changed. Order of operations is