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Last commit 20 Feb 2019 by 
mbed official
targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/us_ticker.c@304:89b9c3a9a045, 2014-08-29 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Aug 29 17:15:07 2014 +0100
- Revision:
- 304:89b9c3a9a045
- Parent:
- 219:993c9b0acbcc
- Child:
- 402:09075a3b15e3
Synchronized with git revision 734f365d7da26ef199751f4b0d91611479b495ea
Full URL: https://github.com/mbedmicro/mbed/commit/734f365d7da26ef199751f4b0d91611479b495ea/
1. timestamp_t as an abstraction for time values managed by
Ticker. Using uint64_t for timestamp_t allows a wraparound-free
Ticker. This change forces us to update the definitions of usTicker
for all platforms; but the changes beyond nRF51822 aren't major.
2. reduce power consumption on the nRF51822 by removing the need for
the high-frequency processor timer; and reimplementing it using the
RTC.
I've also replaced high-frequency clock with low-frequency external
clock during system startup of the nRF51822. This brings a major win
in power consumption.
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| mbed_official | 219:993c9b0acbcc | 1 | /* mbed Microcontroller Library |
| mbed_official | 219:993c9b0acbcc | 2 | * Copyright (c) 2014, STMicroelectronics |
| mbed_official | 219:993c9b0acbcc | 3 | * All rights reserved. |
| mbed_official | 219:993c9b0acbcc | 4 | * |
| mbed_official | 219:993c9b0acbcc | 5 | * Redistribution and use in source and binary forms, with or without |
| mbed_official | 219:993c9b0acbcc | 6 | * modification, are permitted provided that the following conditions are met: |
| mbed_official | 219:993c9b0acbcc | 7 | * |
| mbed_official | 219:993c9b0acbcc | 8 | * 1. Redistributions of source code must retain the above copyright notice, |
| mbed_official | 219:993c9b0acbcc | 9 | * this list of conditions and the following disclaimer. |
| mbed_official | 219:993c9b0acbcc | 10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
| mbed_official | 219:993c9b0acbcc | 11 | * this list of conditions and the following disclaimer in the documentation |
| mbed_official | 219:993c9b0acbcc | 12 | * and/or other materials provided with the distribution. |
| mbed_official | 219:993c9b0acbcc | 13 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
| mbed_official | 219:993c9b0acbcc | 14 | * may be used to endorse or promote products derived from this software |
| mbed_official | 219:993c9b0acbcc | 15 | * without specific prior written permission. |
| mbed_official | 219:993c9b0acbcc | 16 | * |
| mbed_official | 219:993c9b0acbcc | 17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| mbed_official | 219:993c9b0acbcc | 18 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| mbed_official | 219:993c9b0acbcc | 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| mbed_official | 219:993c9b0acbcc | 20 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| mbed_official | 219:993c9b0acbcc | 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| mbed_official | 219:993c9b0acbcc | 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| mbed_official | 219:993c9b0acbcc | 23 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| mbed_official | 219:993c9b0acbcc | 24 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| mbed_official | 219:993c9b0acbcc | 25 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| mbed_official | 219:993c9b0acbcc | 26 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| mbed_official | 219:993c9b0acbcc | 27 | */ |
| mbed_official | 219:993c9b0acbcc | 28 | #include <stddef.h> |
| mbed_official | 219:993c9b0acbcc | 29 | #include "us_ticker_api.h" |
| mbed_official | 219:993c9b0acbcc | 30 | #include "PeripheralNames.h" |
| mbed_official | 219:993c9b0acbcc | 31 | |
| mbed_official | 219:993c9b0acbcc | 32 | // 32-bit timer selection |
| mbed_official | 219:993c9b0acbcc | 33 | #define TIM_MST TIM2 |
| mbed_official | 219:993c9b0acbcc | 34 | #define TIM_MST_IRQ TIM2_IRQn |
| mbed_official | 219:993c9b0acbcc | 35 | #define TIM_MST_RCC __TIM2_CLK_ENABLE() |
| mbed_official | 219:993c9b0acbcc | 36 | |
| mbed_official | 219:993c9b0acbcc | 37 | static TIM_HandleTypeDef TimMasterHandle; |
| mbed_official | 219:993c9b0acbcc | 38 | static int us_ticker_inited = 0; |
| mbed_official | 219:993c9b0acbcc | 39 | |
| mbed_official | 219:993c9b0acbcc | 40 | void us_ticker_init(void) { |
| mbed_official | 219:993c9b0acbcc | 41 | if (us_ticker_inited) return; |
| mbed_official | 219:993c9b0acbcc | 42 | us_ticker_inited = 1; |
| mbed_official | 219:993c9b0acbcc | 43 | |
| mbed_official | 219:993c9b0acbcc | 44 | // Update the SystemCoreClock variable |
| mbed_official | 219:993c9b0acbcc | 45 | SystemCoreClockUpdate(); |
| mbed_official | 219:993c9b0acbcc | 46 | |
| mbed_official | 219:993c9b0acbcc | 47 | // Enable timer clock |
| mbed_official | 219:993c9b0acbcc | 48 | TIM_MST_RCC; |
| mbed_official | 219:993c9b0acbcc | 49 | |
| mbed_official | 219:993c9b0acbcc | 50 | // Configure time base |
| mbed_official | 219:993c9b0acbcc | 51 | TimMasterHandle.Instance = TIM_MST; |
| mbed_official | 219:993c9b0acbcc | 52 | TimMasterHandle.Init.Period = 0xFFFFFFFF; |
| mbed_official | 304:89b9c3a9a045 | 53 | TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 �s tick |
| mbed_official | 219:993c9b0acbcc | 54 | TimMasterHandle.Init.ClockDivision = 0; |
| mbed_official | 219:993c9b0acbcc | 55 | TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP; |
| mbed_official | 219:993c9b0acbcc | 56 | TimMasterHandle.Init.RepetitionCounter = 0; |
| mbed_official | 219:993c9b0acbcc | 57 | HAL_TIM_OC_Init(&TimMasterHandle); |
| mbed_official | 219:993c9b0acbcc | 58 | |
| mbed_official | 219:993c9b0acbcc | 59 | NVIC_SetVector(TIM_MST_IRQ, (uint32_t)us_ticker_irq_handler); |
| mbed_official | 219:993c9b0acbcc | 60 | NVIC_EnableIRQ(TIM_MST_IRQ); |
| mbed_official | 219:993c9b0acbcc | 61 | |
| mbed_official | 219:993c9b0acbcc | 62 | // Enable timer |
| mbed_official | 219:993c9b0acbcc | 63 | HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1); |
| mbed_official | 219:993c9b0acbcc | 64 | } |
| mbed_official | 219:993c9b0acbcc | 65 | |
| mbed_official | 219:993c9b0acbcc | 66 | uint32_t us_ticker_read() { |
| mbed_official | 219:993c9b0acbcc | 67 | if (!us_ticker_inited) us_ticker_init(); |
| mbed_official | 219:993c9b0acbcc | 68 | return TIM_MST->CNT; |
| mbed_official | 219:993c9b0acbcc | 69 | } |
| mbed_official | 219:993c9b0acbcc | 70 | |
| mbed_official | 304:89b9c3a9a045 | 71 | void us_ticker_set_interrupt(timestamp_t timestamp) { |
| mbed_official | 219:993c9b0acbcc | 72 | // Set new output compare value |
| mbed_official | 304:89b9c3a9a045 | 73 | __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, (uint32_t)timestamp); |
| mbed_official | 219:993c9b0acbcc | 74 | // Enable IT |
| mbed_official | 219:993c9b0acbcc | 75 | __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1); |
| mbed_official | 219:993c9b0acbcc | 76 | } |
| mbed_official | 219:993c9b0acbcc | 77 | |
| mbed_official | 219:993c9b0acbcc | 78 | void us_ticker_disable_interrupt(void) { |
| mbed_official | 219:993c9b0acbcc | 79 | __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1); |
| mbed_official | 219:993c9b0acbcc | 80 | } |
| mbed_official | 219:993c9b0acbcc | 81 | |
| mbed_official | 219:993c9b0acbcc | 82 | void us_ticker_clear_interrupt(void) { |
| mbed_official | 219:993c9b0acbcc | 83 | __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1); |
| mbed_official | 219:993c9b0acbcc | 84 | } |
