o add snes fatfs dummy

o add fatfs custom chip to bsnes
o finishes fatfs linux backend smaple

snes/fatfstest/debug.c

@@ -0,0 +1,51 @@
+#include "data.h"
+#include "pad.h"
+#include "PPU.h"
+#include "ressource.h"
+
+word debugMap[0x400];
+void initDebugMap(void) {
+	word i;
+	for(i=0; i<0x400; i++) {
+		debugMap[i] = 0x00;
+	}
+}
+
+char hex_chars[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
+
+void int2hex(unsigned long number, char *buf,word size)
+{
+    unsigned long n;
+    unsigned char i;
+    //unsigned char x;
+    for (i = 0; i < size; i++) {
+        n = number >> 4;
+        //x = (number - (n << 4));
+        buf[size-i-1] = hex_chars[(number - (n << 4))]; 
+        number = n;    
+    }
+
+}
+
+void printDebugScreen(char *buffer,word y){
+    char i;
+    waitForVBlank();
+	for(i=0; i<32; i++) {
+		waitForVBlank();
+		VRAMByteWrite((byte) (buffer[i]-32), (word) (0x4000+i+(y*0x20)));
+	}
+}
+
+void printf(char *buffer){
+	while(*buffer)
+	    *(byte*) 0x3000=*buffer++;
+}
+
+void enableDebugScreen(void){
+	VRAMLoad((word) debugFont_pic, 0x5000, 2048);
+	CGRAMLoad((word) debugFont_pal, (byte) 0x00, (word) 16);
+	VRAMLoad((word) debugMap, 0x4000, 0x0800);
+	setTileMapLocation(0x4000, (byte) 0x00, (byte) 0);
+	setCharacterLocation(0x5000, (byte) 0);
+	*(byte*) 0x2100 = 0x0f; // enable background
+}