Create function header

src/debug/Makefile.am

@@ -33,6 +33,7 @@ libpspdebug_a_SOURCES =		\
 	kprintf.c	\
 	stacktrace.c	\
 	profiler.c \
+	screenshot.c \
 	stdio.c		\
 	sio.c
 

src/debug/pspdebug.h

@@ -433,6 +433,16 @@ void pspDebugSioEnableKprintf(void);
  */
 void pspDebugSioDisableKprintf(void);
 
+/**
+ * Save a screenshot to a file
+ *
+ * @param filename - The filename to save the screenshot for the current frame buffer displayed on the screen. 
+ * The filename will be saved with a BMP extension.
+ *
+ * @return 0 on success, -1 on error
+ */
+int pspScreenshotSave(const char *filename);
+
 /**@}*/
 
 #ifdef __cplusplus

src/debug/screenshot.c

@@ -0,0 +1,17 @@
+/*
+ * PSP Software Development Kit - https://github.com/pspdev
+ * -----------------------------------------------------------------------
+ * Licensed under the BSD license, see LICENSE in PSPSDK root for details.
+ *
+ *  screenshot.c - Simple screen debug keyboard
+ *
+ * Copyright (c) 2025, Francisco Javier Trujillo Mata <fjtrujy@gmail.com>
+ *
+ */
+
+#include "pspdebug.h"
+
+int pspScreenshotSave(const char *filename)
+{
+    return 0;
+}