mbed library sources
Dependents: Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more
Superseded
This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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.
targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/us_ticker.c@87:085cde657901, 2014-02-08 (annotated)
- Committer:
- mbed_official
- Date:
- Sat Feb 08 19:45:06 2014 +0000
- Revision:
- 87:085cde657901
- Child:
- 91:0a39e62a0464
Synchronized with git revision 9272cdeb45ec7e6077641536509413da8fd2ebc2
Full URL: https://github.com/mbedmicro/mbed/commit/9272cdeb45ec7e6077641536509413da8fd2ebc2/
Add NUCLEO_F401RE, improvements
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 87:085cde657901 | 1 | /* mbed Microcontroller Library |
mbed_official | 87:085cde657901 | 2 | * Copyright (c) 2014, STMicroelectronics |
mbed_official | 87:085cde657901 | 3 | * All rights reserved. |
mbed_official | 87:085cde657901 | 4 | * |
mbed_official | 87:085cde657901 | 5 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 87:085cde657901 | 6 | * modification, are permitted provided that the following conditions are met: |
mbed_official | 87:085cde657901 | 7 | * |
mbed_official | 87:085cde657901 | 8 | * 1. Redistributions of source code must retain the above copyright notice, |
mbed_official | 87:085cde657901 | 9 | * this list of conditions and the following disclaimer. |
mbed_official | 87:085cde657901 | 10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
mbed_official | 87:085cde657901 | 11 | * this list of conditions and the following disclaimer in the documentation |
mbed_official | 87:085cde657901 | 12 | * and/or other materials provided with the distribution. |
mbed_official | 87:085cde657901 | 13 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
mbed_official | 87:085cde657901 | 14 | * may be used to endorse or promote products derived from this software |
mbed_official | 87:085cde657901 | 15 | * without specific prior written permission. |
mbed_official | 87:085cde657901 | 16 | * |
mbed_official | 87:085cde657901 | 17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
mbed_official | 87:085cde657901 | 18 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
mbed_official | 87:085cde657901 | 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
mbed_official | 87:085cde657901 | 20 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
mbed_official | 87:085cde657901 | 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
mbed_official | 87:085cde657901 | 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
mbed_official | 87:085cde657901 | 23 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 87:085cde657901 | 24 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
mbed_official | 87:085cde657901 | 25 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
mbed_official | 87:085cde657901 | 26 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
mbed_official | 87:085cde657901 | 27 | */ |
mbed_official | 87:085cde657901 | 28 | #include <stddef.h> |
mbed_official | 87:085cde657901 | 29 | #include "us_ticker_api.h" |
mbed_official | 87:085cde657901 | 30 | #include "PeripheralNames.h" |
mbed_official | 87:085cde657901 | 31 | #include "stm32f4xx_hal.h" |
mbed_official | 87:085cde657901 | 32 | |
mbed_official | 87:085cde657901 | 33 | // Timer selection: |
mbed_official | 87:085cde657901 | 34 | |
mbed_official | 87:085cde657901 | 35 | #define TIM_MST TIM1 |
mbed_official | 87:085cde657901 | 36 | #define TIM_MST_UP_IRQ TIM1_UP_TIM10_IRQn |
mbed_official | 87:085cde657901 | 37 | #define TIM_MST_OC_IRQ TIM1_CC_IRQn |
mbed_official | 87:085cde657901 | 38 | #define TIM_MST_RCC __TIM1_CLK_ENABLE() |
mbed_official | 87:085cde657901 | 39 | |
mbed_official | 87:085cde657901 | 40 | static TIM_HandleTypeDef TimMasterHandle; |
mbed_official | 87:085cde657901 | 41 | |
mbed_official | 87:085cde657901 | 42 | static int us_ticker_inited = 0; |
mbed_official | 87:085cde657901 | 43 | static uint32_t SlaveCounter = 0; |
mbed_official | 87:085cde657901 | 44 | static uint32_t us_ticker_int_counter = 0; |
mbed_official | 87:085cde657901 | 45 | static uint16_t us_ticker_int_remainder = 0; |
mbed_official | 87:085cde657901 | 46 | |
mbed_official | 87:085cde657901 | 47 | // Used to increment the slave counter |
mbed_official | 87:085cde657901 | 48 | static void tim_update_irq_handler(void) { |
mbed_official | 87:085cde657901 | 49 | SlaveCounter++; |
mbed_official | 87:085cde657901 | 50 | if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_UPDATE) == SET) { |
mbed_official | 87:085cde657901 | 51 | __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_UPDATE); |
mbed_official | 87:085cde657901 | 52 | __HAL_TIM_SetCounter(&TimMasterHandle, 0); // Reset counter !!! |
mbed_official | 87:085cde657901 | 53 | } |
mbed_official | 87:085cde657901 | 54 | } |
mbed_official | 87:085cde657901 | 55 | |
mbed_official | 87:085cde657901 | 56 | // Used by interrupt system |
mbed_official | 87:085cde657901 | 57 | static void tim_oc_irq_handler(void) { |
mbed_official | 87:085cde657901 | 58 | // Clear interrupt flag |
mbed_official | 87:085cde657901 | 59 | if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC1) == SET) { |
mbed_official | 87:085cde657901 | 60 | __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1); |
mbed_official | 87:085cde657901 | 61 | } |
mbed_official | 87:085cde657901 | 62 | |
mbed_official | 87:085cde657901 | 63 | if (us_ticker_int_counter > 0) { |
mbed_official | 87:085cde657901 | 64 | __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, 0xFFFF); |
mbed_official | 87:085cde657901 | 65 | us_ticker_int_counter--; |
mbed_official | 87:085cde657901 | 66 | } else { |
mbed_official | 87:085cde657901 | 67 | if (us_ticker_int_remainder > 0) { |
mbed_official | 87:085cde657901 | 68 | __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, us_ticker_int_remainder); |
mbed_official | 87:085cde657901 | 69 | us_ticker_int_remainder = 0; |
mbed_official | 87:085cde657901 | 70 | } else { |
mbed_official | 87:085cde657901 | 71 | // This function is going to disable the interrupts if there are |
mbed_official | 87:085cde657901 | 72 | // no other events in the queue |
mbed_official | 87:085cde657901 | 73 | us_ticker_irq_handler(); |
mbed_official | 87:085cde657901 | 74 | } |
mbed_official | 87:085cde657901 | 75 | } |
mbed_official | 87:085cde657901 | 76 | } |
mbed_official | 87:085cde657901 | 77 | |
mbed_official | 87:085cde657901 | 78 | void us_ticker_init(void) { |
mbed_official | 87:085cde657901 | 79 | if (us_ticker_inited) return; |
mbed_official | 87:085cde657901 | 80 | us_ticker_inited = 1; |
mbed_official | 87:085cde657901 | 81 | |
mbed_official | 87:085cde657901 | 82 | // Enable Timer clock |
mbed_official | 87:085cde657901 | 83 | TIM_MST_RCC; |
mbed_official | 87:085cde657901 | 84 | |
mbed_official | 87:085cde657901 | 85 | // Configure time base |
mbed_official | 87:085cde657901 | 86 | TimMasterHandle.Instance = TIM_MST; |
mbed_official | 87:085cde657901 | 87 | TimMasterHandle.Init.Period = 0xFFFF; |
mbed_official | 87:085cde657901 | 88 | TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick |
mbed_official | 87:085cde657901 | 89 | TimMasterHandle.Init.ClockDivision = 0; |
mbed_official | 87:085cde657901 | 90 | TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP; |
mbed_official | 87:085cde657901 | 91 | TimMasterHandle.Init.RepetitionCounter = 0; |
mbed_official | 87:085cde657901 | 92 | //HAL_TIM_Base_Init(&TimMasterHandle); |
mbed_official | 87:085cde657901 | 93 | HAL_TIM_OC_Init(&TimMasterHandle); |
mbed_official | 87:085cde657901 | 94 | |
mbed_official | 87:085cde657901 | 95 | /* |
mbed_official | 87:085cde657901 | 96 | TIM_OC_InitTypeDef sConfig; |
mbed_official | 87:085cde657901 | 97 | sConfig.OCMode = TIM_OCMODE_INACTIVE; |
mbed_official | 87:085cde657901 | 98 | sConfig.OCPolarity = TIM_OCPOLARITY_HIGH; |
mbed_official | 87:085cde657901 | 99 | sConfig.Pulse = 0; |
mbed_official | 87:085cde657901 | 100 | HAL_TIM_OC_ConfigChannel(&TimMasterHandle, &sConfig, TIM_CHANNEL_1); |
mbed_official | 87:085cde657901 | 101 | */ |
mbed_official | 87:085cde657901 | 102 | |
mbed_official | 87:085cde657901 | 103 | // Configure interrupts |
mbed_official | 87:085cde657901 | 104 | __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_UPDATE); |
mbed_official | 87:085cde657901 | 105 | __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1); |
mbed_official | 87:085cde657901 | 106 | |
mbed_official | 87:085cde657901 | 107 | // For 32-bit counter |
mbed_official | 87:085cde657901 | 108 | NVIC_SetVector(TIM_MST_UP_IRQ, (uint32_t)tim_update_irq_handler); |
mbed_official | 87:085cde657901 | 109 | NVIC_EnableIRQ(TIM_MST_UP_IRQ); |
mbed_official | 87:085cde657901 | 110 | |
mbed_official | 87:085cde657901 | 111 | // For ouput compare |
mbed_official | 87:085cde657901 | 112 | NVIC_SetVector(TIM_MST_OC_IRQ, (uint32_t)tim_oc_irq_handler); |
mbed_official | 87:085cde657901 | 113 | NVIC_EnableIRQ(TIM_MST_OC_IRQ); |
mbed_official | 87:085cde657901 | 114 | |
mbed_official | 87:085cde657901 | 115 | // Enable timer |
mbed_official | 87:085cde657901 | 116 | //HAL_TIM_Base_Start(&TimMasterHandle); |
mbed_official | 87:085cde657901 | 117 | HAL_TIM_OC_Start(&TimMasterHandle, TIM_CHANNEL_1); |
mbed_official | 87:085cde657901 | 118 | } |
mbed_official | 87:085cde657901 | 119 | |
mbed_official | 87:085cde657901 | 120 | uint32_t us_ticker_read() { |
mbed_official | 87:085cde657901 | 121 | uint32_t counter, counter2; |
mbed_official | 87:085cde657901 | 122 | if (!us_ticker_inited) us_ticker_init(); |
mbed_official | 87:085cde657901 | 123 | // A situation might appear when Master overflows right after Slave is read and before the |
mbed_official | 87:085cde657901 | 124 | // new (overflowed) value of Master is read. Which would make the code below consider the |
mbed_official | 87:085cde657901 | 125 | // previous (incorrect) value of Slave and the new value of Master, which would return a |
mbed_official | 87:085cde657901 | 126 | // value in the past. Avoid this by computing consecutive values of the timer until they |
mbed_official | 87:085cde657901 | 127 | // are properly ordered. |
mbed_official | 87:085cde657901 | 128 | counter = (uint32_t)(SlaveCounter << 16); |
mbed_official | 87:085cde657901 | 129 | counter += TIM_MST->CNT; |
mbed_official | 87:085cde657901 | 130 | while (1) { |
mbed_official | 87:085cde657901 | 131 | counter2 = (uint32_t)(SlaveCounter << 16); |
mbed_official | 87:085cde657901 | 132 | counter2 += TIM_MST->CNT; |
mbed_official | 87:085cde657901 | 133 | if (counter2 > counter) { |
mbed_official | 87:085cde657901 | 134 | break; |
mbed_official | 87:085cde657901 | 135 | } |
mbed_official | 87:085cde657901 | 136 | counter = counter2; |
mbed_official | 87:085cde657901 | 137 | } |
mbed_official | 87:085cde657901 | 138 | return counter2; |
mbed_official | 87:085cde657901 | 139 | } |
mbed_official | 87:085cde657901 | 140 | |
mbed_official | 87:085cde657901 | 141 | void us_ticker_set_interrupt(unsigned int timestamp) { |
mbed_official | 87:085cde657901 | 142 | int delta = (int)(timestamp - us_ticker_read()); |
mbed_official | 87:085cde657901 | 143 | |
mbed_official | 87:085cde657901 | 144 | if (delta <= 0) { // This event was in the past |
mbed_official | 87:085cde657901 | 145 | us_ticker_irq_handler(); |
mbed_official | 87:085cde657901 | 146 | return; |
mbed_official | 87:085cde657901 | 147 | } |
mbed_official | 87:085cde657901 | 148 | else { |
mbed_official | 87:085cde657901 | 149 | us_ticker_int_counter = (uint32_t)(delta >> 16); |
mbed_official | 87:085cde657901 | 150 | us_ticker_int_remainder = (uint16_t)(delta & 0xFFFF); |
mbed_official | 87:085cde657901 | 151 | if (us_ticker_int_counter > 0) { // means delta > 0xFFFF |
mbed_official | 87:085cde657901 | 152 | __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, 0xFFFF); |
mbed_official | 87:085cde657901 | 153 | us_ticker_int_counter--; |
mbed_official | 87:085cde657901 | 154 | } else { |
mbed_official | 87:085cde657901 | 155 | __HAL_TIM_SetCompare(&TimMasterHandle, TIM_CHANNEL_1, us_ticker_int_remainder); |
mbed_official | 87:085cde657901 | 156 | us_ticker_int_remainder = 0; |
mbed_official | 87:085cde657901 | 157 | } |
mbed_official | 87:085cde657901 | 158 | __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_CC1); |
mbed_official | 87:085cde657901 | 159 | } |
mbed_official | 87:085cde657901 | 160 | } |
mbed_official | 87:085cde657901 | 161 | |
mbed_official | 87:085cde657901 | 162 | void us_ticker_disable_interrupt(void) { |
mbed_official | 87:085cde657901 | 163 | __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1); |
mbed_official | 87:085cde657901 | 164 | } |
mbed_official | 87:085cde657901 | 165 | |
mbed_official | 87:085cde657901 | 166 | void us_ticker_clear_interrupt(void) { |
mbed_official | 87:085cde657901 | 167 | if (__HAL_TIM_GET_ITSTATUS(&TimMasterHandle, TIM_IT_CC1) == SET) { |
mbed_official | 87:085cde657901 | 168 | __HAL_TIM_CLEAR_IT(&TimMasterHandle, TIM_IT_CC1); |
mbed_official | 87:085cde657901 | 169 | } |
mbed_official | 87:085cde657901 | 170 | } |