1 /* mbed Microcontroller Library
2 * Copyright (c) 2014, STMicroelectronics
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include "us_ticker_api.h"
30 #include "PeripheralNames.h"
32 // 32-bit timer selection
35 static TIM_HandleTypeDef TimMasterHandle;
36 static int us_ticker_inited = 0;
38 void us_ticker_init(void)
40 if (us_ticker_inited) return;
43 TimMasterHandle.Instance = TIM_MST;
45 HAL_InitTick(0); // The passed value is not used
48 uint32_t us_ticker_read()
50 if (!us_ticker_inited) us_ticker_init();
54 void us_ticker_set_interrupt(timestamp_t timestamp)
56 // Set new output compare value
57 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp);
59 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
62 void us_ticker_disable_interrupt(void)
64 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
67 void us_ticker_clear_interrupt(void)
69 __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1);