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 *
 *   Copyright (c) 2017 PX4 Development Team. All rights reserved.
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 * modification, are permitted provided that the following conditions
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 *
 * 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. Neither the name PX4 nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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/**
 * @file PWM trigger output interface.
 *
 */

#pragma once

#include <px4_platform_common/defines.h>

#include <stdint.h>

__BEGIN_DECLS

/**
 * Intialise the PWM servo outputs using the specified configuration.
 *
 * @param channel_mask	Bitmask of channels (LSB = channel 0) to enable.
 *			This allows some of the channels to remain configured
 *			as GPIOs or as another function.
 * @return		OK on success.
 */
__EXPORT extern int	up_pwm_trigger_init(uint32_t channel_mask);

/**
 * De-initialise the PWM trigger outputs.
 */
__EXPORT extern void	up_pwm_trigger_deinit(void);

/**
 * Arm or disarm trigger outputs.
 *
 * @bug This function should, but does not, guarantee that any pulse
 *      currently in progress is cleanly completed.
 *
 * @param armed		If true, outputs are armed; if false they
 *			are disarmed.
 */
__EXPORT extern void	up_pwm_trigger_arm(bool armed);

/**
 * Set the current output value for a channel.
 *
 * @param channel	The channel to set.
 * @param value		The output pulse width in microseconds.
 */
__EXPORT extern int	up_pwm_trigger_set(unsigned channel, uint16_t value);

__END_DECLS