f32xbase/fw/example/example.c

/*
 * 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();
}