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