Add a demo for GFILE

demos/modules/gfile/fatfs/demo.mk

@@ -0,0 +1,3 @@
+DEMODIR = 	$(GFXLIB)/demos/modules/gfile/fatfs
+GFXINC +=   $(DEMODIR)
+GFXSRC +=	$(DEMODIR)/main.c

demos/modules/gfile/fatfs/gfxconf.h

@@ -0,0 +1,10 @@
+#ifndef _GFXCONF_H
+#define _GFXCONF_H
+
+#define GFX_USE_GFILE				TRUE
+
+#define GFILE_NEED_FATFS			TRUE
+#define GFILE_NEED_NOAUTOMOUNT		TRUE
+#define GFILE_NEED_PRINTG			TRUE
+
+#endif /* _GFXCONF_H */

demos/modules/gfile/fatfs/main.c

@@ -0,0 +1,60 @@
+#include "gfx.h"
+#include <string.h>
+
+/* Function to log messages to a file. */
+void LogInfo(const char* msg) {
+	GFILE* logFile;
+	
+	logFile = gfileOpen("info.txt", "a");		// Open the file for append
+	if (logfile) {
+		gfileWrite(logFile, msg, strlen(msg));
+		gfileClose(logFile);					// Close the file again
+	}
+}
+
+int main(void) {
+	GFILE* file;							// GFILE variable to store file info.
+	const char msg[] = "Hello file!";		// String to write to a file.
+	
+	/* Call the µGFX init routine. */
+	gfxInit();
+	
+	/* Mount the file system. */
+	if (gfileMount('F', "/"))
+		gfxHalt("Can't mount the FAT file system");
+
+	/* Check if a file exists. */
+	if (gfileExists("file.txt"))
+		LogInfo("[Info]: File exists already!");
+	else
+		LogInfo("[Info]: The file does not exist yet!");	
+	
+	/* Write a string to the file. */
+	file = gfileOpen("file.txt", "wx");
+	if(!file) {
+		LogInfo("[Error]: Something went wrong opening the file.");
+		gfxHalt("Can't open the file file.txt");;
+	}
+	
+	/* A normal write */		
+	gfileWrite(file, msg, strlen(msg));
+	
+	/* Write the file size in the file using the uGFX equivalent of fprintf(). */
+	fnprintg(file, 30, "The file is currently %dkB", gfileGetSize(file));
+	
+	/* Close the file */
+	gfileClose(file);
+	
+	/* Rename te file. */
+	gfileRename("file.txt", "renamedFile.txt");
+	
+	/* Unmount the file system again */
+	gfileUnmount('F', "/");
+	
+	/* This line should not work as the file system is now unmounted */
+	LogInfo("[Info]: Entering enldess while loop.");
+	
+	/* The program ends here. */
+	while(1)
+		gfxSleepMilliseconds(200);
+}