Added attempt to load SNES clock offset from /snes_clk.txt before defaulting to -16000

Cart_Reader/snes_clk.cpp

@@ -0,0 +1,27 @@
+#include "snes_clk.h"
+#include <SdFat.h>
+
+int32_t readClockOffset() {
+	File clock_file;
+	unsigned char* clock_buf;
+	int16_t i;
+	int32_t clock_offset;
+	if(!clock_file.open("/snes_clk.txt", FILE_READ)) {
+		return INT32_MIN;
+	}
+
+	clock_buf = malloc(16 * sizeof(char));
+	i = clock_file.read(clock_buf, 16);
+	clock_file.close();
+	if(i == -1) {
+		free(clock_buf);
+		return 0;
+	} else if(i < 16) {
+		clock_buf[i] = 0;
+	}
+
+	clock_offset = (int32_t)atoi(clock_buf);
+	free(clock_buf);
+
+	return clock_offset;
+}

Cart_Reader/snes_clk.h

@@ -0,0 +1,8 @@
+#ifndef _SNES_CLK_H
+#define _SNES_CLK_H
+
+#include <SdFat.h>
+
+int32_t readClockOffset();
+
+#endif