timer_config.cpp
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/****************************************************************************
*
* Copyright (C) 2016 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.
*
****************************************************************************/
#include <px4_arch/io_timer_hw_description.h>
/* IO Timers normally free-run at 1MHz
* Here we make adjustments to the Frequency that sets the timer's prescale
* so that the prescale is set to 0
*/
#define TIMx_CLKIN 1000000
static inline constexpr io_timers_t initIOTimerOverrideClockFreq(Timer::Timer timer)
{
io_timers_t ret = initIOTimer(timer);
ret.clock_freq = TIMx_CLKIN;
return ret;
}
constexpr io_timers_t io_timers[MAX_IO_TIMERS] = {
initIOTimerOverrideClockFreq(Timer::Timer2),
initIOTimerOverrideClockFreq(Timer::Timer4),
};
constexpr timer_io_channels_t timer_io_channels[MAX_TIMER_IO_CHANNELS] = {
initIOTimerChannel(io_timers, {Timer::Timer2, Timer::Channel2}, {GPIO::PortA, GPIO::Pin1}),
initIOTimerChannel(io_timers, {Timer::Timer2, Timer::Channel4}, {GPIO::PortB, GPIO::Pin11}),
initIOTimerChannel(io_timers, {Timer::Timer2, Timer::Channel1}, {GPIO::PortA, GPIO::Pin15}),
initIOTimerChannel(io_timers, {Timer::Timer4, Timer::Channel4}, {GPIO::PortB, GPIO::Pin9}),
};
constexpr io_timers_channel_mapping_t io_timers_channel_mapping =
initIOTimerChannelMapping(io_timers, timer_io_channels);