passport-firmware/lib/asf4/samd21/hpl/rtc/hpl_rtc.c

/**
 * \file
 *
 * \brief RTC Driver (Calendar Mode)
 *
 * Copyright (C) 2014-2017 Atmel Corporation. All rights reserved.
 *
 * \asf_license_start
 *
 * \page License
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The name of Atmel may not be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 *    Atmel microcontroller product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * \asf_license_stop
 *
 */

#include "hpl_calendar.h"
#include "hpl_timer.h"
#include <hpl_rtc_config.h>
#include <utils_assert.h>

/*!< Pointer to hpl device */

static struct _timer_device *_rtc_dev = NULL;

/**
 * \brief Initialize Timer
 */
int32_t _timer_init(struct _timer_device *const dev, void *const hw)
{
	ASSERT(dev);

	uint16_t register_value;
	dev->hw = hw;

	hri_rtcmode0_write_CTRL_reg(dev->hw, RTC_MODE0_CTRL_SWRST);
	hri_rtcmode0_wait_for_sync(dev->hw);

	/* Set mode 0 */
	register_value = RTC_MODE0_CTRL_MODE(0);

	/* Set prescaler */
	register_value |= RTC_MODE0_CTRL_PRESCALER(CONF_RTC_PRESCALER);

	/* clear counter on compare/timer match */
	register_value |= RTC_MODE0_CTRL_MATCHCLR;

	hri_rtcmode0_write_CTRL_reg(dev->hw, register_value);

	hri_rtcmode0_write_COMP_COMP_bf(dev->hw, 0, CONF_RTC_COMP_VAL);
	hri_rtcmode0_set_INTEN_CMP0_bit(dev->hw);

/* set event control */
#if CONF_RTC_EVENT_CONTROL_ENABLE == 1
	hri_rtcmode0_write_EVCTRL_reg(dev->hw,
	                              (CONF_RTC_PEREO0 << RTC_MODE0_EVCTRL_PEREO0_Pos)
	                                  | (CONF_RTC_PEREO1 << RTC_MODE0_EVCTRL_PEREO1_Pos)
	                                  | (CONF_RTC_PEREO2 << RTC_MODE0_EVCTRL_PEREO2_Pos)
	                                  | (CONF_RTC_PEREO3 << RTC_MODE0_EVCTRL_PEREO3_Pos)
	                                  | (CONF_RTC_PEREO4 << RTC_MODE0_EVCTRL_PEREO4_Pos)
	                                  | (CONF_RTC_PEREO5 << RTC_MODE0_EVCTRL_PEREO5_Pos)
	                                  | (CONF_RTC_PEREO6 << RTC_MODE0_EVCTRL_PEREO6_Pos)
	                                  | (CONF_RTC_PEREO7 << RTC_MODE0_EVCTRL_PEREO7_Pos)
	                                  | (CONF_RTC_COMPE0 << RTC_MODE0_EVCTRL_CMPEO_Pos)
	                                  | (CONF_RTC_OVFEO << RTC_MODE0_EVCTRL_OVFEO_Pos));
#endif

	_rtc_dev = dev;

	return ERR_NONE;
}

/**
 * \brief De-initialize Timer
 */
void _timer_deinit(struct _timer_device *const dev)
{
	ASSERT(dev && dev->hw);

	NVIC_DisableIRQ(RTC_IRQn);

	hri_rtcmode0_write_CTRL_reg(dev->hw, RTC_MODE0_CTRL_SWRST);
}

/**
 * \brief Start hardware timer
 */
void _timer_start(struct _timer_device *const dev)
{
	ASSERT(dev && dev->hw);

	NVIC_EnableIRQ(RTC_IRQn);
	hri_rtcmode0_write_COUNT_COUNT_bf(dev->hw, 0);
	hri_rtcmode0_wait_for_sync(dev->hw);
	hri_rtcmode0_set_CTRL_ENABLE_bit(dev->hw);
}

/**
 * \brief Stop hardware timer
 */
void _timer_stop(struct _timer_device *const dev)
{
	ASSERT(dev && dev->hw);

	hri_rtcmode0_clear_CTRL_ENABLE_bit(dev->hw);
}

/**
 * \brief Set timer period
 */
void _timer_set_period(struct _timer_device *const dev, const uint32_t clock_cycles)
{
	hri_rtcmode0_write_COMP_COMP_bf(dev->hw, 0, clock_cycles);
}

/**
 * \brief Retrieve timer period
 */
uint32_t _timer_get_period(const struct _timer_device *const dev)
{
	return hri_rtcmode0_read_COMP_COMP_bf(dev->hw, 0);
}

/**
 * \brief Check if timer is running
 */
bool _timer_is_started(const struct _timer_device *const dev)
{
	return hri_rtcmode0_get_CTRL_ENABLE_bit(dev->hw);
}

/**
 * \brief Set timer IRQ
 */
void _timer_set_irq(struct _timer_device *const dev)
{
	(void)dev;
}

/**
 * \brief RTC Timer interrupt handler
 *
 * \param[in] p The pointer to calendar device struct
 */
static void _rtc_timer_interrupt_handler(struct _timer_device *dev)
{
	/* Read and mask interrupt flag register */
	uint16_t flag = hri_rtcmode0_read_INTFLAG_reg(dev->hw);

	if (flag & RTC_MODE0_INTFLAG_CMP0) {
		if (dev->timer_cb.period_expired) {
			dev->timer_cb.period_expired(dev);
		}

		/* Clear interrupt flag */
		hri_rtcmode0_clear_interrupt_CMP0_bit(dev->hw);
	}
}

/**
 * \brief Retrieve timer helper functions
 */
struct _timer_hpl_interface *_rtc_get_timer(void)
{
	return NULL;
}

/**
 * \brief Rtc interrupt handler
 */
void RTC_Handler(void)
{
	_rtc_timer_interrupt_handler(_rtc_dev);
}