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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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

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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@268:402bcc0c870b, 2014-07-29 (annotated)

Committer:
mbed_official
Date:
Tue Jul 29 19:00:07 2014 +0100
Revision:
268:402bcc0c870b
Parent:
248:0df67d8046d9
Child:
304:89b9c3a9a045
Synchronized with git revision 490d1a6606b3138f165c5edf2f2370ca616587c0



Full URL: https://github.com/mbedmicro/mbed/commit/490d1a6606b3138f165c5edf2f2370ca616587c0/



[LPC1114] Sleep fix + some device.h settings

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 181:a4cbdfbbd2f4 32 // Timer selection:
mbed_official 181:a4cbdfbbd2f4 33 #define TIM_MST TIM21
mbed_official 181:a4cbdfbbd2f4 34 #define TIM_MST_IRQ TIM21_IRQn
mbed_official 181:a4cbdfbbd2f4 35 #define TIM_MST_RCC __TIM21_CLK_ENABLE()
mbed_official 181:a4cbdfbbd2f4 36
mbed_official 181:a4cbdfbbd2f4 37 static TIM_HandleTypeDef TimMasterHandle;
mbed_official 181:a4cbdfbbd2f4 38
mbed_official 181:a4cbdfbbd2f4 39 static int us_ticker_inited = 0;
mbed_official 181:a4cbdfbbd2f4 40 static volatile uint32_t SlaveCounter = 0;
mbed_official 181:a4cbdfbbd2f4 41 static volatile uint32_t oc_int_part = 0;
mbed_official 181:a4cbdfbbd2f4 42 static volatile uint16_t oc_rem_part = 0;
mbed_official 181:a4cbdfbbd2f4 43
mbed_official 181:a4cbdfbbd2f4 44 void set_compare(uint16_t count) {
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 181:a4cbdfbbd2f4 51 static void tim_irq_handler(void) {
mbed_official 181:a4cbdfbbd2f4 52 uint16_t cval = TIM_MST->CNT;
mbed_official 181:a4cbdfbbd2f4 53
mbed_official 248:0df67d8046d9 54 // Clear Update interrupt flag
mbed_official 248:0df67d8046d9 55 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE) == SET) {
mbed_official 248:0df67d8046d9 56 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_UPDATE);
mbed_official 181:a4cbdfbbd2f4 57 SlaveCounter++;
mbed_official 181:a4cbdfbbd2f4 58 }
mbed_official 181:a4cbdfbbd2f4 59
mbed_official 248:0df67d8046d9 60 // Clear CC1 interrupt flag
mbed_official 248:0df67d8046d9 61 if (__HAL_TIM_GET_FLAG(&TimMasterHandle, TIM_FLAG_CC1) == SET) {
mbed_official 248:0df67d8046d9 62 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
mbed_official 181:a4cbdfbbd2f4 63 if (oc_rem_part > 0) {
mbed_official 181:a4cbdfbbd2f4 64 set_compare(oc_rem_part); // Finish the remaining time left
mbed_official 181:a4cbdfbbd2f4 65 oc_rem_part = 0;
mbed_official 181:a4cbdfbbd2f4 66 } else {
mbed_official 181:a4cbdfbbd2f4 67 if (oc_int_part > 0) {
mbed_official 181:a4cbdfbbd2f4 68 set_compare(0xFFFF);
mbed_official 181:a4cbdfbbd2f4 69 oc_rem_part = cval; // To finish the counter loop the next time
mbed_official 181:a4cbdfbbd2f4 70 oc_int_part--;
mbed_official 181:a4cbdfbbd2f4 71 } else {
mbed_official 181:a4cbdfbbd2f4 72 us_ticker_irq_handler();
mbed_official 181:a4cbdfbbd2f4 73 }
mbed_official 181:a4cbdfbbd2f4 74 }
mbed_official 181:a4cbdfbbd2f4 75 }
mbed_official 181:a4cbdfbbd2f4 76 }
mbed_official 181:a4cbdfbbd2f4 77
mbed_official 181:a4cbdfbbd2f4 78 void us_ticker_init(void) {
mbed_official 181:a4cbdfbbd2f4 79 if (us_ticker_inited) return;
mbed_official 181:a4cbdfbbd2f4 80 us_ticker_inited = 1;
mbed_official 181:a4cbdfbbd2f4 81
mbed_official 181:a4cbdfbbd2f4 82 // Enable timer clock
mbed_official 181:a4cbdfbbd2f4 83 TIM_MST_RCC;
mbed_official 181:a4cbdfbbd2f4 84
mbed_official 181:a4cbdfbbd2f4 85 // Configure time base
mbed_official 181:a4cbdfbbd2f4 86 TimMasterHandle.Instance = TIM_MST;
mbed_official 181:a4cbdfbbd2f4 87 TimMasterHandle.Init.Period = 0xFFFF;
mbed_official 181:a4cbdfbbd2f4 88 TimMasterHandle.Init.Prescaler = (uint32_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
mbed_official 181:a4cbdfbbd2f4 89 TimMasterHandle.Init.ClockDivision = 0;
mbed_official 181:a4cbdfbbd2f4 90 TimMasterHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
mbed_official 181:a4cbdfbbd2f4 91 HAL_TIM_Base_Init(&TimMasterHandle);
mbed_official 181:a4cbdfbbd2f4 92
mbed_official 181:a4cbdfbbd2f4 93 // Configure interrupts
mbed_official 181:a4cbdfbbd2f4 94 __HAL_TIM_ENABLE_IT(&TimMasterHandle, TIM_IT_UPDATE);
mbed_official 181:a4cbdfbbd2f4 95
mbed_official 181:a4cbdfbbd2f4 96 // Update interrupt used for 32-bit counter
mbed_official 181:a4cbdfbbd2f4 97 // Output compare interrupt used for timeout feature
mbed_official 181:a4cbdfbbd2f4 98 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)tim_irq_handler);
mbed_official 181:a4cbdfbbd2f4 99 NVIC_EnableIRQ(TIM_MST_IRQ);
mbed_official 181:a4cbdfbbd2f4 100
mbed_official 181:a4cbdfbbd2f4 101 // Enable timer
mbed_official 181:a4cbdfbbd2f4 102 HAL_TIM_Base_Start(&TimMasterHandle);
mbed_official 181:a4cbdfbbd2f4 103 }
mbed_official 181:a4cbdfbbd2f4 104
mbed_official 181:a4cbdfbbd2f4 105 uint32_t us_ticker_read() {
mbed_official 181:a4cbdfbbd2f4 106 uint32_t counter, counter2;
mbed_official 181:a4cbdfbbd2f4 107 if (!us_ticker_inited) us_ticker_init();
mbed_official 181:a4cbdfbbd2f4 108 // A situation might appear when Master overflows right after Slave is read and before the
mbed_official 181:a4cbdfbbd2f4 109 // new (overflowed) value of Master is read. Which would make the code below consider the
mbed_official 181:a4cbdfbbd2f4 110 // previous (incorrect) value of Slave and the new value of Master, which would return a
mbed_official 181:a4cbdfbbd2f4 111 // value in the past. Avoid this by computing consecutive values of the timer until they
mbed_official 181:a4cbdfbbd2f4 112 // are properly ordered.
mbed_official 181:a4cbdfbbd2f4 113 counter = (uint32_t)(SlaveCounter << 16);
mbed_official 181:a4cbdfbbd2f4 114 counter += TIM_MST->CNT;
mbed_official 181:a4cbdfbbd2f4 115 while (1) {
mbed_official 181:a4cbdfbbd2f4 116 counter2 = (uint32_t)(SlaveCounter << 16);
mbed_official 181:a4cbdfbbd2f4 117 counter2 += TIM_MST->CNT;
mbed_official 181:a4cbdfbbd2f4 118 if (counter2 > counter) {
mbed_official 181:a4cbdfbbd2f4 119 break;
mbed_official 181:a4cbdfbbd2f4 120 }
mbed_official 181:a4cbdfbbd2f4 121 counter = counter2;
mbed_official 181:a4cbdfbbd2f4 122 }
mbed_official 181:a4cbdfbbd2f4 123 return counter2;
mbed_official 181:a4cbdfbbd2f4 124 }
mbed_official 181:a4cbdfbbd2f4 125
mbed_official 181:a4cbdfbbd2f4 126 void us_ticker_set_interrupt(unsigned int timestamp) {
mbed_official 181:a4cbdfbbd2f4 127 int delta = (int)(timestamp - us_ticker_read());
mbed_official 181:a4cbdfbbd2f4 128 uint16_t cval = TIM_MST->CNT;
mbed_official 181:a4cbdfbbd2f4 129
mbed_official 181:a4cbdfbbd2f4 130 if (delta <= 0) { // This event was in the past
mbed_official 181:a4cbdfbbd2f4 131 us_ticker_irq_handler();
mbed_official 181:a4cbdfbbd2f4 132 } else {
mbed_official 181:a4cbdfbbd2f4 133 oc_int_part = (uint32_t)(delta >> 16);
mbed_official 181:a4cbdfbbd2f4 134 oc_rem_part = (uint16_t)(delta & 0xFFFF);
mbed_official 181:a4cbdfbbd2f4 135 if (oc_rem_part <= (0xFFFF - cval)) {
mbed_official 181:a4cbdfbbd2f4 136 set_compare(cval + oc_rem_part);
mbed_official 181:a4cbdfbbd2f4 137 oc_rem_part = 0;
mbed_official 181:a4cbdfbbd2f4 138 } else {
mbed_official 181:a4cbdfbbd2f4 139 set_compare(0xFFFF);
mbed_official 181:a4cbdfbbd2f4 140 oc_rem_part = oc_rem_part - (0xFFFF - cval);
mbed_official 181:a4cbdfbbd2f4 141 }
mbed_official 181:a4cbdfbbd2f4 142 }
mbed_official 181:a4cbdfbbd2f4 143 }
mbed_official 181:a4cbdfbbd2f4 144
mbed_official 181:a4cbdfbbd2f4 145 void us_ticker_disable_interrupt(void) {
mbed_official 181:a4cbdfbbd2f4 146 __HAL_TIM_DISABLE_IT(&TimMasterHandle, TIM_IT_CC1);
mbed_official 181:a4cbdfbbd2f4 147 }
mbed_official 181:a4cbdfbbd2f4 148
mbed_official 181:a4cbdfbbd2f4 149 void us_ticker_clear_interrupt(void) {
mbed_official 248:0df67d8046d9 150 __HAL_TIM_CLEAR_FLAG(&TimMasterHandle, TIM_FLAG_CC1);
mbed_official 181:a4cbdfbbd2f4 151 }