git subrepo clone https://github.com/libopencm3/libopencm3

subrepo:
  subdir:   "libopencm3"
  merged:   "f5813a54"
upstream:
  origin:   "https://github.com/libopencm3/libopencm3"
  branch:   "master"
  commit:   "f5813a54"
git-subrepo:
  version:  "0.4.3"
  origin:   "???"
  commit:   "???"

libopencm3/lib/stm32/f1/timer.c

@@ -0,0 +1,53 @@
+/** @defgroup timer_file TIMER peripheral API
+@ingroup peripheral_apis
+@brief <b>libopencm3 STM32F1xx Timers</b>
+
+@version 1.0.0
+
+@date 18 August 2012
+
+*/
+
+/*
+ * 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
+
+@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.
+*/
+
+void timer_ic_set_polarity(uint32_t timer_peripheral, enum tim_ic_id ic,
+			   enum tim_ic_pol pol)
+{
+	if (pol) {
+		TIM_CCER(timer_peripheral) |= (0x2 << (ic * 4));
+	} else {
+		TIM_CCER(timer_peripheral) &= ~(0x2 << (ic * 4));
+	}
+}
+
+/**@}*/