Moved source_fa into trunk

FireBee/trunk/usb/store/udelay.c

@@ -0,0 +1,39 @@
+/* 
+ * David Galvez. 2010, e-mail: dgalvez75@gmail.com
+ * Modified from MiNTlib
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <time.h>
+#include <mint/mintbind.h>
+
+#define USEC_PER_TICK (1000000L / ((unsigned long)CLOCKS_PER_SEC))
+#define	USEC_TO_CLOCK_TICKS(us)	((us) / USEC_PER_TICK )
+
+/*
+ * Galvez: We should use usleep POSIX function in MiNTlib, but it gives problems related with
+ * Fselect system call, until we trace where the problems come from we are using this function 
+ */
+
+void udelay(unsigned long usec)
+{
+	long stop;
+	
+	stop = _clock() + USEC_TO_CLOCK_TICKS(usec);
+	while (_clock() < stop);
+}