Update docs and correct typos

readme.md

@@ -15,9 +15,9 @@ for the z80-based TI-84 Plus monochrome graphics calculator. It runs in the
 open `Asm(prgm)` interface provided in the calculator's `CATALOG` menu.
 It uses the TI-84's on-board Z80 processor.
 
-The reference application implements parallel _blinky_/_hello_-_world_ test-shows.
+The reference application implements parallel _blinky_ and _hello_-_world_ test-shows.
 A minimalistic cooperative multitasking scheduler controls
-the presentation of ASCII-text messages.
+the presentation of the associated ASCII-text messages.
 
 The text-shows _ON_/_OFF_ and _hello_/_world_ are written on the calculator screen.
 Text is used since there is no actual LED present on the calculator-target system.
@@ -48,7 +48,7 @@ Execution:
   - To start the program, use the usual `Asm(prgm)` option found in the `CATALOG` menu and select the `REFAPP` program.
   - To exit the blinky _ON_/_OFF_ show, press the enter key.
 
-The running programm in the toggle-state _ON_ is shown in the image below.
+The running programm in the display-state _ON_/_hello_ is shown in the image below.
 
 ![](./images/ti84-ref_app.jpg)
 

src/app/app_led_util.h

@@ -28,6 +28,5 @@
   void app_led_util_home1     (void)   ATTRIBUTE_NAKED;
   void app_led_util_home2     (void)   ATTRIBUTE_NAKED;
   void app_led_util_init      (void)   ATTRIBUTE_NAKED;
-  bool app_led_util_wants_exit(void)   ATTRIBUTE_NAKED;
 
-#endif // APP_UTIL_2024_01_07_H
+#endif // APP_LED_UTIL_2024_01_07_H

src/mcal/mcal_gpt.h

@@ -3,13 +3,13 @@
 //  Distributed under The Unlicense
 //
 
-#ifndef MCAL_GPT_2024_01_07_H
-  #define MCAL_GPT_2024_01_07_H
+#ifndef MCAL_GPT_2024_01_09_H
+  #define MCAL_GPT_2024_01_09_H
 
   #include <stdint.h>
 
   void    mcal_gpt_init            (void);
   void    mcal_gpt_de_init         (void);
   uint8_t mcal_gpt_get_time_elapsed(void);
 
-#endif // MCAL_GPT_2024_01_07_H
+#endif // MCAL_GPT_2024_01_09_H