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targets/hal/TARGET_STM/TARGET_STM32L4/us_ticker.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2015, STMicroelectronics
bogdanm 0:9b334a45a8ff 3 * All rights reserved.
bogdanm 0:9b334a45a8ff 4 *
bogdanm 0:9b334a45a8ff 5 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 6 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 9 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 11 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 12 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 14 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 15 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 16 *
bogdanm 0:9b334a45a8ff 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 27 */
bogdanm 0:9b334a45a8ff 28 #include <stddef.h>
bogdanm 0:9b334a45a8ff 29 #include "us_ticker_api.h"
bogdanm 0:9b334a45a8ff 30 #include "PeripheralNames.h"
bogdanm 0:9b334a45a8ff 31
bogdanm 0:9b334a45a8ff 32 #define TIM_MST TIM5
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34 static TIM_HandleTypeDef TimMasterHandle;
bogdanm 0:9b334a45a8ff 35 static int us_ticker_inited = 0;
bogdanm 0:9b334a45a8ff 36
bogdanm 0:9b334a45a8ff 37 void us_ticker_init(void)
bogdanm 0:9b334a45a8ff 38 {
bogdanm 0:9b334a45a8ff 39 if (us_ticker_inited) return;
bogdanm 0:9b334a45a8ff 40 us_ticker_inited = 1;
bogdanm 0:9b334a45a8ff 41
bogdanm 0:9b334a45a8ff 42 TimMasterHandle.Instance = TIM_MST;
bogdanm 0:9b334a45a8ff 43
bogdanm 0:9b334a45a8ff 44 HAL_InitTick(0); // The passed value is not used
bogdanm 0:9b334a45a8ff 45 }
bogdanm 0:9b334a45a8ff 46
bogdanm 0:9b334a45a8ff 47 uint32_t us_ticker_read()
bogdanm 0:9b334a45a8ff 48 {
bogdanm 0:9b334a45a8ff 49 if (!us_ticker_inited) us_ticker_init();
bogdanm 0:9b334a45a8ff 50 return TIM_MST->CNT;
bogdanm 0:9b334a45a8ff 51 }
bogdanm 0:9b334a45a8ff 52
bogdanm 0:9b334a45a8ff 53 void us_ticker_set_interrupt(timestamp_t timestamp)
bogdanm 0:9b334a45a8ff 54 {
bogdanm 0:9b334a45a8ff 55 // Set new output compare value
bogdanm 0:9b334a45a8ff 56 __HAL_TIM_SET_COMPARE(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp);
bogdanm 0:9b334a45a8ff 57 // Enable IT
bogdanm 0:9b334a45a8ff 58 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
bogdanm 0:9b334a45a8ff 59 }
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 void us_ticker_disable_interrupt(void)
bogdanm 0:9b334a45a8ff 62 {
bogdanm 0:9b334a45a8ff 63 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
bogdanm 0:9b334a45a8ff 64 }
bogdanm 0:9b334a45a8ff 65
bogdanm 0:9b334a45a8ff 66 void us_ticker_clear_interrupt(void)
bogdanm 0:9b334a45a8ff 67 {
bogdanm 0:9b334a45a8ff 68 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);
bogdanm 0:9b334a45a8ff 69 }