Add option to disable debug port if it's not required.

.vscode/c_cpp_properties.json

@@ -12,6 +12,9 @@
                 "F_CPU=8000000",
                 "_DEBUG=1",
                 "_BUILD_TYPE=\"Debug\"",
+                "_FEATURE_ON=1",
+                "_FEATURE_OFF=0",
+                "_FEATURE_ENABLE_DEBUG_PORT=_FEATURE_ON",
                 "_CONFIG_DFLT_WPM=200",
                 "_CONFIG_DFLT_WPM_ELEMENT_SCALE=1.0f",
                 "_CONFIG_DFLT_BUZZER_ENABLED=true",

CMakeLists.txt

@@ -85,6 +85,9 @@ add_compile_definitions(
     $<$<CONFIG:RelWithDebuInfo>:_DEBUG=0>
     $<$<CONFIG:MinSizeRel>:NDEBUG>
     $<$<CONFIG:MinSizeRel>:_DEBUG=0>
+    # Flags for features
+    _FEATURE_ON=1
+    _FEATURE_OFF=0
 )
 
 # Set compiler options

configuration.cmake

@@ -7,6 +7,17 @@
 # @cpyrt    © 2025 by Chris Vig. Licensed under the GNU General Public License v3 (GPLv3).
 #
 
+# -- Feature Enablement --
+
+# Define values
+set(FEATURE_ENABLE_DEBUG_PORT               _FEATURE_ON
+    CACHE STRING                            "Set to _FEATURE_ON to enable the debug port.")
+
+# Set compile definitions
+add_compile_definitions(
+    _FEATURE_ENABLE_DEBUG_PORT=${FEATURE_ENABLE_DEBUG_PORT}
+)
+
 # -- Configuration Defaults --
 
 # Define values

src/main/application/debug_port.c

@@ -9,11 +9,14 @@
 
 /* ---------------------------------------------------- INCLUDES ---------------------------------------------------- */
 
+// Unconditionally include these so the compiler doesn't complain about an empty translation unit
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
+#if defined( _FEATURE_ENABLE_DEBUG_PORT ) && _FEATURE_ENABLE_DEBUG_PORT
+
 #include "application/buzzer.h"
 #include "application/config.h"
 #include "application/debug_port.h"
@@ -928,3 +931,5 @@ static void print_invalid_command( char const * const command )
     debug_port_print( "\"" NEWLINE_STR );
 
 }   /* print_invalid_command() */
+
+#endif /* defined( _FEATURE_ENABLE_DEBUG_PORT ) && _FEATURE_ENABLE_DEBUG_PORT */

src/main/application/debug_port.h

@@ -27,6 +27,8 @@
 
 /* ---------------------------------------------- PROCEDURE PROTOTYPES ---------------------------------------------- */
 
+#if defined( _FEATURE_ENABLE_DEBUG_PORT ) && _FEATURE_ENABLE_DEBUG_PORT
+
 /**
  * @fn      debug_port_init( void )
  * @brief   Initializes the debug port.
@@ -58,4 +60,15 @@ void debug_port_tick( tick_t tick );
  */
 void debug_port_usart_rx( void );
 
+#else
+
+// Define dummy macros if debug port is disabled
+#define debug_port_init()
+#define debug_port_print( _str )        ( false )
+#define debug_port_printf( _fmt, ... )  ( false )
+#define debug_port_tick( _tick )
+#define debug_port_usart_rx()
+
+#endif /* defined( _FEATURE_ENABLE_DEBUG_PORT ) && _FEATURE_ENABLE_DEBUG_PORT */
+
 #endif /* !defined( APPLICATION_DEBUG_PORT_H ) */