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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_L053R8/us_ticker.c@440:8a0b45cd594f, 2014-12-16 (annotated)

Committer:
mbed_official
Date:
Tue Dec 16 08:15:08 2014 +0000
Revision:
440:8a0b45cd594f
Parent:
436:cef2a8a56f9e 
Synchronized with git revision 67fbbf0b635d0c0d93fbe433306c537c2ad206aa



Full URL: https://github.com/mbedmicro/mbed/commit/67fbbf0b635d0c0d93fbe433306c537c2ad206aa/



Targets: nrf51 - updating app_timer.c from Norid'c SDKv7.1.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 181:a4cbdfbbd2f4 1 /* mbed Microcontroller Library
mbed_official 181:a4cbdfbbd2f4 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 181:a4cbdfbbd2f4 3 * All rights reserved.
mbed_official 181:a4cbdfbbd2f4 4 *
mbed_official 181:a4cbdfbbd2f4 5 * Redistribution and use in source and binary forms, with or without
mbed_official 181:a4cbdfbbd2f4 6 * modification, are permitted provided that the following conditions are met:
mbed_official 181:a4cbdfbbd2f4 7 *
mbed_official 181:a4cbdfbbd2f4 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 9 * this list of conditions and the following disclaimer.
mbed_official 181:a4cbdfbbd2f4 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 181:a4cbdfbbd2f4 12 * and/or other materials provided with the distribution.
mbed_official 181:a4cbdfbbd2f4 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 181:a4cbdfbbd2f4 14 * may be used to endorse or promote products derived from this software
mbed_official 181:a4cbdfbbd2f4 15 * without specific prior written permission.
mbed_official 181:a4cbdfbbd2f4 16 *
mbed_official 181:a4cbdfbbd2f4 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 181:a4cbdfbbd2f4 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 181:a4cbdfbbd2f4 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 181:a4cbdfbbd2f4 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 181:a4cbdfbbd2f4 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 181:a4cbdfbbd2f4 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 181:a4cbdfbbd2f4 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 181:a4cbdfbbd2f4 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 181:a4cbdfbbd2f4 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 181:a4cbdfbbd2f4 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 181:a4cbdfbbd2f4 27 */
mbed_official 181:a4cbdfbbd2f4 28 #include <stddef.h>
mbed_official 181:a4cbdfbbd2f4 29 #include "us_ticker_api.h"
mbed_official 181:a4cbdfbbd2f4 30 #include "PeripheralNames.h"
mbed_official 181:a4cbdfbbd2f4 31
mbed_official 436:cef2a8a56f9e 32 // Timer selection
mbed_official 436:cef2a8a56f9e 33 #define TIM_MST TIM21
mbed_official 181:a4cbdfbbd2f4 34
mbed_official 181:a4cbdfbbd2f4 35 static TIM_HandleTypeDef TimMasterHandle;
mbed_official 436:cef2a8a56f9e 36 static int us_ticker_inited = 0;
mbed_official 181:a4cbdfbbd2f4 37
mbed_official 436:cef2a8a56f9e 38 volatile uint32_t SlaveCounter = 0;
mbed_official 436:cef2a8a56f9e 39 volatile uint32_t oc_int_part = 0;
mbed_official 436:cef2a8a56f9e 40 volatile uint16_t oc_rem_part = 0;
mbed_official 181:a4cbdfbbd2f4 41
mbed_official 402:09075a3b15e3 42 void set_compare(uint16_t count)
mbed_official 402:09075a3b15e3 43 {
mbed_official 436:cef2a8a56f9e 44 TimMasterHandle.Instance = TIM_MST;
mbed_official 181:a4cbdfbbd2f4 45 // Set new output compare value
mbed_official 181:a4cbdfbbd2f4 46 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, count);
mbed_official 181:a4cbdfbbd2f4 47 // Enable IT
mbed_official 181:a4cbdfbbd2f4 48 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
mbed_official 181:a4cbdfbbd2f4 49 }
mbed_official 181:a4cbdfbbd2f4 50
mbed_official 402:09075a3b15e3 51 void us_ticker_init(void)
mbed_official 402:09075a3b15e3 52 {
mbed_official 181:a4cbdfbbd2f4 53 if (us_ticker_inited) return;
mbed_official 181:a4cbdfbbd2f4 54 us_ticker_inited = 1;
mbed_official 181:a4cbdfbbd2f4 55
mbed_official 436:cef2a8a56f9e 56 HAL_InitTick(0); // The passed value is not used
mbed_official 181:a4cbdfbbd2f4 57 }
mbed_official 181:a4cbdfbbd2f4 58
mbed_official 402:09075a3b15e3 59 uint32_t us_ticker_read()
mbed_official 402:09075a3b15e3 60 {
mbed_official 181:a4cbdfbbd2f4 61 uint32_t counter, counter2;
mbed_official 181:a4cbdfbbd2f4 62 if (!us_ticker_inited) us_ticker_init();
mbed_official 181:a4cbdfbbd2f4 63 // A situation might appear when Master overflows right after Slave is read and before the
mbed_official 181:a4cbdfbbd2f4 64 // new (overflowed) value of Master is read. Which would make the code below consider the
mbed_official 181:a4cbdfbbd2f4 65 // previous (incorrect) value of Slave and the new value of Master, which would return a
mbed_official 181:a4cbdfbbd2f4 66 // value in the past. Avoid this by computing consecutive values of the timer until they
mbed_official 181:a4cbdfbbd2f4 67 // are properly ordered.
mbed_official 181:a4cbdfbbd2f4 68 counter = (uint32_t)(SlaveCounter << 16);
mbed_official 181:a4cbdfbbd2f4 69 counter += TIM_MST->CNT;
mbed_official 181:a4cbdfbbd2f4 70 while (1) {
mbed_official 181:a4cbdfbbd2f4 71 counter2 = (uint32_t)(SlaveCounter << 16);
mbed_official 181:a4cbdfbbd2f4 72 counter2 += TIM_MST->CNT;
mbed_official 181:a4cbdfbbd2f4 73 if (counter2 > counter) {
mbed_official 181:a4cbdfbbd2f4 74 break;
mbed_official 181:a4cbdfbbd2f4 75 }
mbed_official 181:a4cbdfbbd2f4 76 counter = counter2;
mbed_official 181:a4cbdfbbd2f4 77 }
mbed_official 181:a4cbdfbbd2f4 78 return counter2;
mbed_official 181:a4cbdfbbd2f4 79 }
mbed_official 181:a4cbdfbbd2f4 80
mbed_official 402:09075a3b15e3 81 void us_ticker_set_interrupt(timestamp_t timestamp)
mbed_official 402:09075a3b15e3 82 {
mbed_official 304:89b9c3a9a045 83 int delta = (int)((uint32_t)timestamp - us_ticker_read());
mbed_official 181:a4cbdfbbd2f4 84 uint16_t cval = TIM_MST->CNT;
mbed_official 181:a4cbdfbbd2f4 85
mbed_official 181:a4cbdfbbd2f4 86 if (delta <= 0) { // This event was in the past
mbed_official 181:a4cbdfbbd2f4 87 us_ticker_irq_handler();
mbed_official 181:a4cbdfbbd2f4 88 } else {
mbed_official 181:a4cbdfbbd2f4 89 oc_int_part = (uint32_t)(delta >> 16);
mbed_official 181:a4cbdfbbd2f4 90 oc_rem_part = (uint16_t)(delta & 0xFFFF);
mbed_official 181:a4cbdfbbd2f4 91 if (oc_rem_part <= (0xFFFF - cval)) {
mbed_official 181:a4cbdfbbd2f4 92 set_compare(cval + oc_rem_part);
mbed_official 181:a4cbdfbbd2f4 93 oc_rem_part = 0;
mbed_official 181:a4cbdfbbd2f4 94 } else {
mbed_official 181:a4cbdfbbd2f4 95 set_compare(0xFFFF);
mbed_official 181:a4cbdfbbd2f4 96 oc_rem_part = oc_rem_part - (0xFFFF - cval);
mbed_official 181:a4cbdfbbd2f4 97 }
mbed_official 181:a4cbdfbbd2f4 98 }
mbed_official 181:a4cbdfbbd2f4 99 }
mbed_official 181:a4cbdfbbd2f4 100
mbed_official 402:09075a3b15e3 101 void us_ticker_disable_interrupt(void)
mbed_official 402:09075a3b15e3 102 {
mbed_official 436:cef2a8a56f9e 103 TimMasterHandle.Instance = TIM_MST;
mbed_official 181:a4cbdfbbd2f4 104 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
mbed_official 181:a4cbdfbbd2f4 105 }
mbed_official 181:a4cbdfbbd2f4 106
mbed_official 402:09075a3b15e3 107 void us_ticker_clear_interrupt(void)
mbed_official 402:09075a3b15e3 108 {
mbed_official 436:cef2a8a56f9e 109 TimMasterHandle.Instance = TIM_MST;
mbed_official 436:cef2a8a56f9e 110 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
mbed_official 436:cef2a8a56f9e 111 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
mbed_official 436:cef2a8a56f9e 112 }
mbed_official 181:a4cbdfbbd2f4 113 }