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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_F103RB/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:
402:09075a3b15e3
Child:
489:119543c9f674
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 52:a51c77007319 1 /* mbed Microcontroller Library
mbed_official 70:c1fbde68b492 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 70:c1fbde68b492 3 * All rights reserved.
mbed_official 52:a51c77007319 4 *
mbed_official 70:c1fbde68b492 5 * Redistribution and use in source and binary forms, with or without
mbed_official 70:c1fbde68b492 6 * modification, are permitted provided that the following conditions are met:
mbed_official 52:a51c77007319 7 *
mbed_official 70:c1fbde68b492 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 70:c1fbde68b492 9 * this list of conditions and the following disclaimer.
mbed_official 70:c1fbde68b492 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 70:c1fbde68b492 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 70:c1fbde68b492 12 * and/or other materials provided with the distribution.
mbed_official 70:c1fbde68b492 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 70:c1fbde68b492 14 * may be used to endorse or promote products derived from this software
mbed_official 70:c1fbde68b492 15 * without specific prior written permission.
mbed_official 52:a51c77007319 16 *
mbed_official 70:c1fbde68b492 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 70:c1fbde68b492 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 70:c1fbde68b492 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 70:c1fbde68b492 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 70:c1fbde68b492 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 70:c1fbde68b492 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 70:c1fbde68b492 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 70:c1fbde68b492 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 70:c1fbde68b492 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 70:c1fbde68b492 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 52:a51c77007319 27 */
mbed_official 52:a51c77007319 28 #include <stddef.h>
mbed_official 52:a51c77007319 29 #include "us_ticker_api.h"
mbed_official 52:a51c77007319 30 #include "PeripheralNames.h"
mbed_official 52:a51c77007319 31
mbed_official 84:f54042cbc282 32 // Timer selection:
mbed_official 167:d5744491c362 33 #define TIM_MST TIM4
mbed_official 167:d5744491c362 34 #define TIM_MST_IRQ TIM4_IRQn
mbed_official 167:d5744491c362 35 #define TIM_MST_RCC RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE)
mbed_official 76:aeb1df146756 36
mbed_official 84:f54042cbc282 37 static int us_ticker_inited = 0;
mbed_official 92:05f19f05c134 38 static volatile uint32_t SlaveCounter = 0;
mbed_official 96:c359415e941f 39 static volatile uint32_t oc_int_part = 0;
mbed_official 96:c359415e941f 40 static volatile uint16_t oc_rem_part = 0;
mbed_official 91:0a39e62a0464 41
mbed_official 402:09075a3b15e3 42 void set_compare(uint16_t count)
mbed_official 402:09075a3b15e3 43 {
mbed_official 91:0a39e62a0464 44 // Set new output compare value
mbed_official 91:0a39e62a0464 45 TIM_SetCompare1(TIM_MST, count);
mbed_official 91:0a39e62a0464 46 // Enable IT
mbed_official 91:0a39e62a0464 47 TIM_ITConfig(TIM_MST, TIM_IT_CC1, ENABLE);
mbed_official 91:0a39e62a0464 48 }
mbed_official 84:f54042cbc282 49
mbed_official 402:09075a3b15e3 50 static void tim_irq_handler(void)
mbed_official 402:09075a3b15e3 51 {
mbed_official 167:d5744491c362 52 uint16_t cval = TIM_MST->CNT;
mbed_official 167:d5744491c362 53
mbed_official 84:f54042cbc282 54 if (TIM_GetITStatus(TIM_MST, TIM_IT_Update) == SET) {
mbed_official 84:f54042cbc282 55 TIM_ClearITPendingBit(TIM_MST, TIM_IT_Update);
mbed_official 94:6519f69185ce 56 SlaveCounter++;
mbed_official 84:f54042cbc282 57 }
mbed_official 76:aeb1df146756 58
mbed_official 84:f54042cbc282 59 if (TIM_GetITStatus(TIM_MST, TIM_IT_CC1) == SET) {
mbed_official 84:f54042cbc282 60 TIM_ClearITPendingBit(TIM_MST, TIM_IT_CC1);
mbed_official 167:d5744491c362 61 if (oc_rem_part > 0) {
mbed_official 167:d5744491c362 62 set_compare(oc_rem_part); // Finish the remaining time left
mbed_official 167:d5744491c362 63 oc_rem_part = 0;
mbed_official 174:8bb9f3a33240 64 } else {
mbed_official 167:d5744491c362 65 if (oc_int_part > 0) {
mbed_official 169:60881100c991 66 set_compare(0xFFFF);
mbed_official 169:60881100c991 67 oc_rem_part = cval; // To finish the counter loop the next time
mbed_official 167:d5744491c362 68 oc_int_part--;
mbed_official 174:8bb9f3a33240 69 } else {
mbed_official 167:d5744491c362 70 us_ticker_irq_handler();
mbed_official 167:d5744491c362 71 }
mbed_official 84:f54042cbc282 72 }
mbed_official 91:0a39e62a0464 73 }
mbed_official 84:f54042cbc282 74 }
mbed_official 76:aeb1df146756 75
mbed_official 402:09075a3b15e3 76 void us_ticker_init(void)
mbed_official 402:09075a3b15e3 77 {
mbed_official 52:a51c77007319 78 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
mbed_official 174:8bb9f3a33240 79
mbed_official 52:a51c77007319 80 if (us_ticker_inited) return;
mbed_official 52:a51c77007319 81 us_ticker_inited = 1;
mbed_official 174:8bb9f3a33240 82
mbed_official 174:8bb9f3a33240 83 // Enable timer clock
mbed_official 76:aeb1df146756 84 TIM_MST_RCC;
mbed_official 174:8bb9f3a33240 85
mbed_official 84:f54042cbc282 86 // Configure time base
mbed_official 54:24d77221bceb 87 TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
mbed_official 52:a51c77007319 88 TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
mbed_official 304:89b9c3a9a045 89 TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 �s tick
mbed_official 52:a51c77007319 90 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
mbed_official 52:a51c77007319 91 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
mbed_official 76:aeb1df146756 92 TIM_TimeBaseInit(TIM_MST, &TIM_TimeBaseStructure);
mbed_official 174:8bb9f3a33240 93
mbed_official 84:f54042cbc282 94 // Configure interrupts
mbed_official 84:f54042cbc282 95 TIM_ITConfig(TIM_MST, TIM_IT_Update, ENABLE);
mbed_official 174:8bb9f3a33240 96
mbed_official 91:0a39e62a0464 97 // Update interrupt used for 32-bit counter
mbed_official 91:0a39e62a0464 98 // Output compare interrupt used for timeout feature
mbed_official 167:d5744491c362 99 NVIC_SetVector(TIM_MST_IRQ, (uint32_t)tim_irq_handler);
mbed_official 167:d5744491c362 100 NVIC_EnableIRQ(TIM_MST_IRQ);
mbed_official 174:8bb9f3a33240 101
mbed_official 84:f54042cbc282 102 // Enable timer
mbed_official 76:aeb1df146756 103 TIM_Cmd(TIM_MST, ENABLE);
mbed_official 52:a51c77007319 104 }
mbed_official 52:a51c77007319 105
mbed_official 402:09075a3b15e3 106 uint32_t us_ticker_read()
mbed_official 402:09075a3b15e3 107 {
mbed_official 54:24d77221bceb 108 uint32_t counter, counter2;
mbed_official 52:a51c77007319 109 if (!us_ticker_inited) us_ticker_init();
mbed_official 76:aeb1df146756 110 // A situation might appear when Master overflows right after Slave is read and before the
mbed_official 76:aeb1df146756 111 // new (overflowed) value of Master is read. Which would make the code below consider the
mbed_official 76:aeb1df146756 112 // previous (incorrect) value of Slave and the new value of Master, which would return a
mbed_official 54:24d77221bceb 113 // value in the past. Avoid this by computing consecutive values of the timer until they
mbed_official 54:24d77221bceb 114 // are properly ordered.
mbed_official 84:f54042cbc282 115 counter = (uint32_t)(SlaveCounter << 16);
mbed_official 91:0a39e62a0464 116 counter += TIM_MST->CNT;
mbed_official 54:24d77221bceb 117 while (1) {
mbed_official 84:f54042cbc282 118 counter2 = (uint32_t)(SlaveCounter << 16);
mbed_official 91:0a39e62a0464 119 counter2 += TIM_MST->CNT;
mbed_official 76:aeb1df146756 120 if (counter2 > counter) {
mbed_official 54:24d77221bceb 121 break;
mbed_official 76:aeb1df146756 122 }
mbed_official 54:24d77221bceb 123 counter = counter2;
mbed_official 54:24d77221bceb 124 }
mbed_official 54:24d77221bceb 125 return counter2;
mbed_official 52:a51c77007319 126 }
mbed_official 52:a51c77007319 127
mbed_official 402:09075a3b15e3 128 void us_ticker_set_interrupt(timestamp_t timestamp)
mbed_official 402:09075a3b15e3 129 {
mbed_official 304:89b9c3a9a045 130 int delta = (int)((uint32_t)timestamp - us_ticker_read());
mbed_official 91:0a39e62a0464 131 uint16_t cval = TIM_MST->CNT;
mbed_official 84:f54042cbc282 132
mbed_official 84:f54042cbc282 133 if (delta <= 0) { // This event was in the past
mbed_official 84:f54042cbc282 134 us_ticker_irq_handler();
mbed_official 174:8bb9f3a33240 135 } else {
mbed_official 91:0a39e62a0464 136 oc_int_part = (uint32_t)(delta >> 16);
mbed_official 91:0a39e62a0464 137 oc_rem_part = (uint16_t)(delta & 0xFFFF);
mbed_official 91:0a39e62a0464 138 if (oc_rem_part <= (0xFFFF - cval)) {
mbed_official 91:0a39e62a0464 139 set_compare(cval + oc_rem_part);
mbed_official 91:0a39e62a0464 140 oc_rem_part = 0;
mbed_official 84:f54042cbc282 141 } else {
mbed_official 91:0a39e62a0464 142 set_compare(0xFFFF);
mbed_official 91:0a39e62a0464 143 oc_rem_part = oc_rem_part - (0xFFFF - cval);
mbed_official 84:f54042cbc282 144 }
mbed_official 52:a51c77007319 145 }
mbed_official 52:a51c77007319 146 }
mbed_official 52:a51c77007319 147
mbed_official 402:09075a3b15e3 148 void us_ticker_disable_interrupt(void)
mbed_official 402:09075a3b15e3 149 {
mbed_official 76:aeb1df146756 150 TIM_ITConfig(TIM_MST, TIM_IT_CC1, DISABLE);
mbed_official 52:a51c77007319 151 }
mbed_official 52:a51c77007319 152
mbed_official 402:09075a3b15e3 153 void us_ticker_clear_interrupt(void)
mbed_official 402:09075a3b15e3 154 {
mbed_official 167:d5744491c362 155 TIM_ClearITPendingBit(TIM_MST, TIM_IT_CC1);
mbed_official 52:a51c77007319 156 }