/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
 * Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
 * Copyright (c) 2015 Chuck McManis <cmcmanis@mcmanis.com>
 *
 * 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>

static void gpio_setup(void)
{
	/* Enable GPIOA clock. */
	/* Manually: */
	/*RCC_AHB1ENR |= RCC_AHB1ENR_IOPAEN; */
	/* Using API functions: */
	rcc_periph_clock_enable(RCC_GPIOA);

	/* Set GPIO5 (in GPIO port A) to 'output push-pull'. */
	/* Manually: */
	/*GPIOA_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << (((8 - 8) * 4) + 2)); */
	/*GPIOA_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << ((8 - 8) * 4)); */
	/* Using API functions: */
	gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO5);
}

int main(void)
{
	int i;

	gpio_setup();

	/* Blink the LED (PC8) on the board. */
	while (1) {
		/* Manually: */
		/* GPIOA_BSRR = GPIO5; */		/* LED off */
		/* for (i = 0; i < 1000000; i++) */	/* Wait a bit. */
		/*	__asm__("nop"); */
		/* GPIOA_BRR = GPIO5; */		/* LED on */
		/* for (i = 0; i < 1000000; i++) */	/* Wait a bit. */
		/*	__asm__("nop"); */

		/* Using API functions gpio_set()/gpio_clear(): */
		/* gpio_set(GPIOA, GPIO5); */	/* LED off */
		/* for (i = 0; i < 1000000; i++) */	/* Wait a bit. */
		/*	__asm__("nop"); */
		/* gpio_clear(GPIOA, GPIO5); */	/* LED on */
		/* for (i = 0; i < 1000000; i++) */	/* Wait a bit. */
		/*	__asm__("nop"); */

		/* Using API function gpio_toggle(): */
		gpio_toggle(GPIOA, GPIO5);	/* LED on/off */
		for (i = 0; i < 1000000; i++) {	/* Wait a bit. */
			__asm__("nop");
		}
	}

	return 0;
}