drv_pwm_trigger.h
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/****************************************************************************
*
* Copyright (c) 2017 PX4 Development Team. All rights reserved.
*
* 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. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
****************************************************************************/
/**
* @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