butano: real time clock (rtc) string added

butano/hw/include/bn_hw_gpio.h

@@ -22,6 +22,8 @@ namespace
     }
 }
 
+[[nodiscard]] const char* init();
+
 [[nodiscard]] inline bool init_rtc()
 {
     return __agbabi_rtc_init() == 0;

butano/hw/src/bn_hw_gpio.bn_noflto.cpp

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2020-2024 Gustavo Valiente [email protected]
+ * zlib License, see LICENSE file.
+ */
+
+#include "../include/bn_hw_gpio.h"
+
+namespace bn::hw::gpio
+{
+
+namespace
+{
+    alignas(int) const char rtc_string[] = "SIIRTC_V001";
+}
+
+const char* init()
+{
+    return rtc_string;
+}
+
+}

butano/include/documentation/bn_documentation_g_changelog.h

@@ -29,6 +29,7 @@
  *   bn::sprite_affine_mat_ptr::set_rotation_angle_safe, bn::sprite_builder::set_rotation_angle_safe
  *   and bn::sprite_ptr::set_rotation_angle_safe added.
  * * Position in `create` methods is now optional.
+ * * Real time clock (RTC) string added.
  * * SRAM string with link-time optimization fixed.
  * * @ref faq_bg_top_left and @ref faq_sprites_top_left questions added to the @ref faq page.
  * * @ref faq_flash_carts_sram question improved.

butano/src/bn_core.cpp

@@ -30,6 +30,7 @@
 #include "bn_hblank_effects_manager.h"
 #include "../hw/include/bn_hw_irq.h"
 #include "../hw/include/bn_hw_core.h"
+#include "../hw/include/bn_hw_gpio.h"
 #include "../hw/include/bn_hw_sram.h"
 #include "../hw/include/bn_hw_timer.h"
 #include "../hw/include/bn_hw_memory.h"
@@ -355,7 +356,10 @@ void init(const optional<color>& transparent_color, const string_view& keypad_co
     data.slow_game_pak = hw::game_pak::init();
     hw::memory::init();
 
-    [[maybe_unused]] const char* sram_type = hw::sram::init();
+    [[maybe_unused]] const char* sram_string = hw::sram::init();
+
+    // Init gpio:
+    [[maybe_unused]] const char* rtc_string = hw::gpio::init();
 
     // Init display:
     display_manager::init();