/* Reflow Oven Controller
 *
 * Copyright (C) 2020  Mario Hüttel <mario.huettel@gmx.net>
 *
 * This file is part of the Reflow Oven Controller Project.
 *
 * The reflow oven controller is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * The Reflow Oven Control Firmware 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 the reflow oven controller project.
 * If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * @addtogroup main-cycle-counter
 * @{
 */

#include <reflow-controller/main-cycle-counter.h>
#include <helper-macros/helper-macros.h>
#include <stm32/stm32f4xx.h>

/**
 * @brief Variable storing the main cycle counter.
 * @note This variable should not be accessed directly.
 * Use the main_cycle_counter_get() or main_cycle_counter_inc() functions.
 */
static uint64_t IN_SECTION(.ccm.bss) main_cycle_counter;

void main_and_core_cycle_counter_init(void)
{
	CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;	

	/* Enable the core cycle counter if available on current processor */
	if (!(DWT->CTRL & DWT_CTRL_NOCYCCNT_Msk)) {
		/* Cycle counter is available. Enable */
		DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
	}

	/* Reset the counters to 0 */
	main_cycle_counter_reset();
	core_cycle_counter_reset();
}	

void main_cycle_counter_reset(void)
{
	main_cycle_counter = 0ULL;
}

void main_cycle_counter_inc(void)
{
	main_cycle_counter++;
}

uint64_t main_cycle_counter_get(void)
{
	return main_cycle_counter;
}

void core_cycle_counter_reset(void)
{
	DWT->CYCCNT = 0UL;
}

uint32_t core_cycle_counter_get(void)
{
	return DWT->CYCCNT;
}

/** @} */