Nothing Special / mbed-STM32F103C8_org

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of mbed-dev by mbed official

targets/hal/TARGET_STM/TARGET_STM32F1/us_ticker.c@140:6f18478c63fa, 2016-05-24 (annotated)

Committer:
mbed_official
Date:
Tue May 24 11:30:12 2016 +0100
Revision:
140:6f18478c63fa
Parent:
0:9b334a45a8ff 
Synchronized with git revision 24136afd3f87e9580dd3d3fcae28e9b9f166af3e



Full URL: https://github.com/mbedmicro/mbed/commit/24136afd3f87e9580dd3d3fcae28e9b9f166af3e/



Fix timer #816 issue for STM32F0 and STM32F1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2014, 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 // Timer selection
bogdanm 0:9b334a45a8ff 33 #define TIM_MST TIM4
bogdanm 0:9b334a45a8ff 34
bogdanm 0:9b334a45a8ff 35 static TIM_HandleTypeDef TimMasterHandle;
bogdanm 0:9b334a45a8ff 36 static int us_ticker_inited = 0;
bogdanm 0:9b334a45a8ff 37
bogdanm 0:9b334a45a8ff 38 volatile uint32_t SlaveCounter = 0;
bogdanm 0:9b334a45a8ff 39 volatile uint32_t oc_int_part = 0;
bogdanm 0:9b334a45a8ff 40 volatile uint16_t oc_rem_part = 0;
mbed_official 140:6f18478c63fa 41 volatile uint16_t cnt_val = 0;
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 void set_compare(uint16_t count)
bogdanm 0:9b334a45a8ff 44 {
bogdanm 0:9b334a45a8ff 45 TimMasterHandle.Instance = TIM_MST;
bogdanm 0:9b334a45a8ff 46 // Set new output compare value
bogdanm 0:9b334a45a8ff 47 __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, count);
bogdanm 0:9b334a45a8ff 48 // Enable IT
bogdanm 0:9b334a45a8ff 49 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1);
bogdanm 0:9b334a45a8ff 50 }
bogdanm 0:9b334a45a8ff 51
bogdanm 0:9b334a45a8ff 52 void us_ticker_init(void)
bogdanm 0:9b334a45a8ff 53 {
bogdanm 0:9b334a45a8ff 54 if (us_ticker_inited) return;
bogdanm 0:9b334a45a8ff 55 us_ticker_inited = 1;
bogdanm 0:9b334a45a8ff 56
bogdanm 0:9b334a45a8ff 57 HAL_InitTick(0); // The passed value is not used
bogdanm 0:9b334a45a8ff 58 }
bogdanm 0:9b334a45a8ff 59
bogdanm 0:9b334a45a8ff 60 uint32_t us_ticker_read()
bogdanm 0:9b334a45a8ff 61 {
mbed_official 140:6f18478c63fa 62 uint32_t counter;
bogdanm 0:9b334a45a8ff 63 if (!us_ticker_inited) us_ticker_init();
mbed_official 140:6f18478c63fa 64
mbed_official 140:6f18478c63fa 65 //Current value of TIM_MST->CNT is stored in cnt_val and is
mbed_official 140:6f18478c63fa 66 //updated in interrupt context
bogdanm 0:9b334a45a8ff 67 counter = (uint32_t)(SlaveCounter << 16);
mbed_official 140:6f18478c63fa 68 counter += cnt_val;
mbed_official 140:6f18478c63fa 69
mbed_official 140:6f18478c63fa 70 return counter;
bogdanm 0:9b334a45a8ff 71 }
bogdanm 0:9b334a45a8ff 72
bogdanm 0:9b334a45a8ff 73 void us_ticker_set_interrupt(timestamp_t timestamp)
bogdanm 0:9b334a45a8ff 74 {
bogdanm 0:9b334a45a8ff 75 int delta = (int)((uint32_t)timestamp - us_ticker_read());
bogdanm 0:9b334a45a8ff 76 uint16_t cval = TIM_MST->CNT;
bogdanm 0:9b334a45a8ff 77
bogdanm 0:9b334a45a8ff 78 if (delta <= 0) { // This event was in the past
bogdanm 0:9b334a45a8ff 79 us_ticker_irq_handler();
bogdanm 0:9b334a45a8ff 80 } else {
bogdanm 0:9b334a45a8ff 81 oc_int_part = (uint32_t)(delta >> 16);
bogdanm 0:9b334a45a8ff 82 oc_rem_part = (uint16_t)(delta & 0xFFFF);
bogdanm 0:9b334a45a8ff 83 if (oc_rem_part <= (0xFFFF - cval)) {
bogdanm 0:9b334a45a8ff 84 set_compare(cval + oc_rem_part);
bogdanm 0:9b334a45a8ff 85 oc_rem_part = 0;
bogdanm 0:9b334a45a8ff 86 } else {
bogdanm 0:9b334a45a8ff 87 set_compare(0xFFFF);
bogdanm 0:9b334a45a8ff 88 oc_rem_part = oc_rem_part - (0xFFFF - cval);
bogdanm 0:9b334a45a8ff 89 }
bogdanm 0:9b334a45a8ff 90 }
bogdanm 0:9b334a45a8ff 91 }
bogdanm 0:9b334a45a8ff 92
bogdanm 0:9b334a45a8ff 93 void us_ticker_disable_interrupt(void)
bogdanm 0:9b334a45a8ff 94 {
bogdanm 0:9b334a45a8ff 95 TimMasterHandle.Instance = TIM_MST;
bogdanm 0:9b334a45a8ff 96 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
bogdanm 0:9b334a45a8ff 97 }
bogdanm 0:9b334a45a8ff 98
bogdanm 0:9b334a45a8ff 99 void us_ticker_clear_interrupt(void)
bogdanm 0:9b334a45a8ff 100 {
bogdanm 0:9b334a45a8ff 101 TimMasterHandle.Instance = TIM_MST;
bogdanm 0:9b334a45a8ff 102 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
bogdanm 0:9b334a45a8ff 103 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
bogdanm 0:9b334a45a8ff 104 }
bogdanm 0:9b334a45a8ff 105 }