fw/example/ - very simple demo application

fw/example/example.c

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+/*
+ * example/example.c - Example application
+ *
+ * Written 2010 by Werner Almesberger
+ * Copyright 2010 Werner Almesberger
+ *
+ * This program 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.
+ */
+
+
+#include <stdint.h>
+
+#include "regs.h"
+
+
+static void count(void)
+{
+	union {
+		uint32_t n;
+		uint8_t a[3];
+	} c;
+
+	c.n = 0;
+	while (1) {
+		P0 = c.a[0];
+		P2 = c.a[1];
+		P3 = c.a[2];
+		c.n++;
+	}
+}
+
+
+void main(void)
+{
+	/*
+	 * VDD monitor enable sequence, section 7.2
+	 *
+	 * - enable voltage monitor
+	 * - wait for monitor to stabilize
+	 * - enable VDD monitor reset
+	 */
+
+	VDM0CN = VDMEN;
+	while (!(VDM0CN & VDDSTAT));
+	RSTSRC = PORSF;
+
+	/*
+	 * Go to 24 Mhz
+	 */
+	OSCICN |= IFCN0 | IFCN1;
+
+	count();
+}