/*
 * This file is part of the Black Magic Debug project.
 *
 * Copyright (C) 2013 Gareth McMullin <gareth@blacksphere.co.nz>
 *
 * 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 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <string.h>
#include <libopencm3/cm3/systick.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/cm3/scb.h>

#include "usbdfu.h"

void dfu_detach(void)
{
        /* USB device must detach, we just reset... */
	scb_reset_system();
}

int main(void)
{
	/* Check the force bootloader pin*/
	rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPBEN);
        /* Pull up an look if external pulled low or if we restart with PB1 low*/
        GPIOB_PUPDR |= 4;
        for (int i = 0; i < 100000; i++)
		__asm__("NOP");
	if (gpio_get(GPIOB, GPIO1))
		dfu_jump_app_if_valid();

	dfu_protect_enable();

        /* Set up clock*/
        rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_168MHZ]);
	systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8);
	systick_set_reload(2100000);

	systick_interrupt_enable();
	systick_counter_enable();

	/* Handle LEDs */
	rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPBEN);
	gpio_clear(GPIOB, GPIO2);
	gpio_mode_setup(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
			GPIO2);

	/* Set up USB*/
	rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPAEN);
	rcc_peripheral_enable_clock(&RCC_AHB2ENR, RCC_AHB2ENR_OTGFSEN);

	/* Set up USB Pins and alternate function*/
	gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE,
		GPIO9 | GPIO10 | GPIO11 | GPIO12);
	gpio_set_af(GPIOA, GPIO_AF10, GPIO9 | GPIO10| GPIO11 | GPIO12);
	dfu_init(&stm32f107_usb_driver);

	dfu_main();
}

void sys_tick_handler(void)
{
	gpio_toggle(GPIOB, GPIO2);  /* Green LED on/off */
}