diff options
Diffstat (limited to 'libopencm3/lib/stm32/common/timer_common_f234.c')
| -rw-r--r-- | libopencm3/lib/stm32/common/timer_common_f234.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/libopencm3/lib/stm32/common/timer_common_f234.c b/libopencm3/lib/stm32/common/timer_common_f234.c new file mode 100644 index 0000000..1506408 --- /dev/null +++ b/libopencm3/lib/stm32/common/timer_common_f234.c @@ -0,0 +1,58 @@ +/** @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)); + } +} +/**@}*/ + + |