/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2015 Karl Palsson <karlp@tweak.net.au>
 *
 * 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/cm3/nvic.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/rcc.h>

#include <stdio.h>
#include "usb-gadget0.h"

#define ER_DEBUG
#ifdef ER_DEBUG
#define ER_DPRINTF(fmt, ...) \
	do { printf(fmt, ## __VA_ARGS__); } while (0)
#else
#define ER_DPRINTF(fmt, ...) \
	do { } while (0)
#endif

int main(void)
{
	rcc_clock_setup_pll(&rcc_hsi_configs[RCC_CLOCK_HSI_48MHZ]);
	/* LED to indicate boot process */
	rcc_periph_clock_enable(RCC_GPIOC);
	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
		GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
	gpio_set(GPIOC, GPIO13);

	rcc_periph_clock_enable(RCC_GPIOA);
	/*
	 * Vile hack to reenumerate, physically _drag_ d+ low.
	 * do NOT do this if you're board has proper usb pull up control!
	 * (need at least 2.5us to trigger usb disconnect)
	 */
	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
		GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
	gpio_clear(GPIOA, GPIO12);
	for (unsigned int i = 0; i < 800000; i++) {
		__asm__("nop");
	}

	rcc_periph_clock_enable(RCC_OTGFS);


	usbd_device *usbd_dev = gadget0_init(&st_usbfs_v1_usb_driver,
					     "stm32f103-generic");

	ER_DPRINTF("bootup complete\n");
	gpio_clear(GPIOC, GPIO13);
	while (1) {
		gadget0_run(usbd_dev);
	}

}