/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2011 Damjan Marion <damjan.marion@gmail.com>
 * Copyright (C) 2011 Mark Panajotovic <marko@electrontube.org>
 * Copyright (C) 2015 Piotr Esden-Tempski <piotr@esden.net>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>

/* Set STM32 to 168 MHz. */
static void clock_setup(void)
{
	rcc_clock_setup_pll(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);

	/* Enable GPIOG clock. */
	rcc_periph_clock_enable(RCC_GPIOG);
}

static void gpio_setup(void)
{
	/* Set GPIO13-14 (in GPIO port G) to 'output push-pull'. */
	gpio_mode_setup(GPIOG, GPIO_MODE_OUTPUT,
			GPIO_PUPD_NONE, GPIO13 | GPIO14);
}

int main(void)
{
	int i;

	clock_setup();
	gpio_setup();

	/* Set two LEDs for wigwag effect when toggling. */
	gpio_set(GPIOG, GPIO13);

	/* Blink the LEDs (PG13 and PG14) on the board. */
	while (1) {
		/* Toggle LEDs. */
		gpio_toggle(GPIOG, GPIO13 | GPIO14);
		for (i = 0; i < 6000000; i++) { /* Wait a bit. */
			__asm__("nop");
		}
	}

	return 0;
}