59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
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/** @addtogroup timer_file
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2010 Edward Cheeseman <evbuilder@users.sourceforge.org>
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* Copyright (C) 2011 Stephen Caudle <scaudle@doceme.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**@{*/
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#include <libopencm3/stm32/timer.h>
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/*---------------------------------------------------------------------------*/
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/** @brief Set Input Polarity
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The timer channel must be set to input capture mode.
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@param[in] timer_peripheral Unsigned int32. Timer register address base
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@param[in] ic ::tim_ic_id. Input Capture channel designator.
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@param[in] pol ::tim_ic_pol. Input Capture polarity control.
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*/
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void timer_ic_set_polarity(uint32_t timer_peripheral, enum tim_ic_id ic,
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enum tim_ic_pol pol)
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{
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/* Clear CCxP and CCxNP to zero. For both edge trigger both fields are
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* set. Case 10 is invalid.
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*/
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TIM_CCER(timer_peripheral) &= ~(0xa << (ic * 4));
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switch (pol) {
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case TIM_IC_RISING: /* 00 */
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break;
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case TIM_IC_BOTH: /* 11 */
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TIM_CCER(timer_peripheral) |= (0xa << (ic * 4));
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break;
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case TIM_IC_FALLING: /* 01 */
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TIM_CCER(timer_peripheral) |= (0x2 << (ic * 4));
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}
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}
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/**@}*/
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