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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_DISCO_F051R8/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:
240:9a7c54113eaf
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 130:1dec54e4aec3 1 /* mbed Microcontroller Library
mbed_official 130:1dec54e4aec3 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 130:1dec54e4aec3 3 * All rights reserved.
mbed_official 130:1dec54e4aec3 4 *
mbed_official 130:1dec54e4aec3 5 * Redistribution and use in source and binary forms, with or without
mbed_official 130:1dec54e4aec3 6 * modification, are permitted provided that the following conditions are met:
mbed_official 130:1dec54e4aec3 7 *
mbed_official 130:1dec54e4aec3 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 130:1dec54e4aec3 9 * this list of conditions and the following disclaimer.
mbed_official 130:1dec54e4aec3 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 130:1dec54e4aec3 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 130:1dec54e4aec3 12 * and/or other materials provided with the distribution.
mbed_official 130:1dec54e4aec3 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 130:1dec54e4aec3 14 * may be used to endorse or promote products derived from this software
mbed_official 130:1dec54e4aec3 15 * without specific prior written permission.
mbed_official 130:1dec54e4aec3 16 *
mbed_official 130:1dec54e4aec3 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 130:1dec54e4aec3 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 130:1dec54e4aec3 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 130:1dec54e4aec3 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 130:1dec54e4aec3 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 130:1dec54e4aec3 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 130:1dec54e4aec3 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 130:1dec54e4aec3 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 130:1dec54e4aec3 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 130:1dec54e4aec3 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 130:1dec54e4aec3 27 */
mbed_official 130:1dec54e4aec3 28 #include <stddef.h>
mbed_official 130:1dec54e4aec3 29 #include "us_ticker_api.h"
mbed_official 130:1dec54e4aec3 30 #include "PeripheralNames.h"
mbed_official 130:1dec54e4aec3 31
mbed_official 130:1dec54e4aec3 32 // Timer selection:
mbed_official 130:1dec54e4aec3 33 #define TIM_MST TIM1
mbed_official 130:1dec54e4aec3 34 #define TIM_MST_UP_IRQ TIM1_BRK_UP_TRG_COM_IRQn
mbed_official 130:1dec54e4aec3 35 #define TIM_MST_OC_IRQ TIM1_CC_IRQn
mbed_official 130:1dec54e4aec3 36 #define TIM_MST_RCC RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE)
mbed_official 130:1dec54e4aec3 37
mbed_official 130:1dec54e4aec3 38 static int us_ticker_inited = 0;
mbed_official 130:1dec54e4aec3 39 static volatile uint32_t SlaveCounter = 0;
mbed_official 130:1dec54e4aec3 40 static volatile uint32_t oc_int_part = 0;
mbed_official 130:1dec54e4aec3 41 static volatile uint16_t oc_rem_part = 0;
mbed_official 130:1dec54e4aec3 42
mbed_official 130:1dec54e4aec3 43 void set_compare(uint16_t count) {
mbed_official 130:1dec54e4aec3 44 // Set new output compare value
mbed_official 130:1dec54e4aec3 45 TIM_SetCompare1(TIM_MST, count);
mbed_official 130:1dec54e4aec3 46 // Enable IT
mbed_official 130:1dec54e4aec3 47 TIM_ITConfig(TIM_MST, TIM_IT_CC1, ENABLE);
mbed_official 130:1dec54e4aec3 48 }
mbed_official 130:1dec54e4aec3 49
mbed_official 130:1dec54e4aec3 50 // Used to increment the slave counter
mbed_official 130:1dec54e4aec3 51 static void tim_update_irq_handler(void) {
mbed_official 130:1dec54e4aec3 52 if (TIM_GetITStatus(TIM_MST, TIM_IT_Update) == SET) {
mbed_official 130:1dec54e4aec3 53 TIM_ClearITPendingBit(TIM_MST, TIM_IT_Update);
mbed_official 130:1dec54e4aec3 54 SlaveCounter++;
mbed_official 130:1dec54e4aec3 55 }
mbed_official 130:1dec54e4aec3 56 }
mbed_official 130:1dec54e4aec3 57
mbed_official 130:1dec54e4aec3 58 // Used by interrupt system
mbed_official 130:1dec54e4aec3 59 static void tim_oc_irq_handler(void) {
mbed_official 130:1dec54e4aec3 60 uint16_t cval = TIM_MST->CNT;
mbed_official 130:1dec54e4aec3 61
mbed_official 130:1dec54e4aec3 62 // Clear interrupt flag
mbed_official 130:1dec54e4aec3 63 if (TIM_GetITStatus(TIM_MST, TIM_IT_CC1) == SET) {
mbed_official 130:1dec54e4aec3 64 TIM_ClearITPendingBit(TIM_MST, TIM_IT_CC1);
mbed_official 130:1dec54e4aec3 65 }
mbed_official 130:1dec54e4aec3 66
mbed_official 130:1dec54e4aec3 67 if (oc_rem_part > 0) {
mbed_official 130:1dec54e4aec3 68 set_compare(oc_rem_part); // Finish the remaining time left
mbed_official 130:1dec54e4aec3 69 oc_rem_part = 0;
mbed_official 240:9a7c54113eaf 70 } else {
mbed_official 130:1dec54e4aec3 71 if (oc_int_part > 0) {
mbed_official 130:1dec54e4aec3 72 set_compare(0xFFFF);
mbed_official 130:1dec54e4aec3 73 oc_rem_part = cval; // To finish the counter loop the next time
mbed_official 130:1dec54e4aec3 74 oc_int_part--;
mbed_official 240:9a7c54113eaf 75 } else {
mbed_official 130:1dec54e4aec3 76 us_ticker_irq_handler();
mbed_official 130:1dec54e4aec3 77 }
mbed_official 130:1dec54e4aec3 78 }
mbed_official 130:1dec54e4aec3 79 }
mbed_official 130:1dec54e4aec3 80
mbed_official 130:1dec54e4aec3 81 void us_ticker_init(void) {
mbed_official 130:1dec54e4aec3 82 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
mbed_official 130:1dec54e4aec3 83
mbed_official 130:1dec54e4aec3 84 if (us_ticker_inited) return;
mbed_official 130:1dec54e4aec3 85 us_ticker_inited = 1;
mbed_official 130:1dec54e4aec3 86
mbed_official 130:1dec54e4aec3 87 // Enable Timer clock
mbed_official 130:1dec54e4aec3 88 TIM_MST_RCC;
mbed_official 130:1dec54e4aec3 89
mbed_official 130:1dec54e4aec3 90 // Configure time base
mbed_official 130:1dec54e4aec3 91 TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
mbed_official 130:1dec54e4aec3 92 TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
mbed_official 130:1dec54e4aec3 93 TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
mbed_official 130:1dec54e4aec3 94 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
mbed_official 130:1dec54e4aec3 95 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
mbed_official 130:1dec54e4aec3 96 TIM_TimeBaseInit(TIM_MST, &TIM_TimeBaseStructure);
mbed_official 130:1dec54e4aec3 97
mbed_official 130:1dec54e4aec3 98 // Configure interrupts
mbed_official 130:1dec54e4aec3 99 TIM_ITConfig(TIM_MST, TIM_IT_Update, ENABLE);
mbed_official 130:1dec54e4aec3 100
mbed_official 130:1dec54e4aec3 101 // Update interrupt used for 32-bit counter
mbed_official 130:1dec54e4aec3 102 NVIC_SetVector(TIM_MST_UP_IRQ, (uint32_t)tim_update_irq_handler);
mbed_official 130:1dec54e4aec3 103 NVIC_EnableIRQ(TIM_MST_UP_IRQ);
mbed_official 130:1dec54e4aec3 104
mbed_official 130:1dec54e4aec3 105 // Output compare interrupt used for timeout feature
mbed_official 130:1dec54e4aec3 106 NVIC_SetVector(TIM_MST_OC_IRQ, (uint32_t)tim_oc_irq_handler);
mbed_official 130:1dec54e4aec3 107 NVIC_EnableIRQ(TIM_MST_OC_IRQ);
mbed_official 130:1dec54e4aec3 108
mbed_official 130:1dec54e4aec3 109 // Enable timer
mbed_official 130:1dec54e4aec3 110 TIM_Cmd(TIM_MST, ENABLE);
mbed_official 130:1dec54e4aec3 111 }
mbed_official 130:1dec54e4aec3 112
mbed_official 130:1dec54e4aec3 113 uint32_t us_ticker_read() {
mbed_official 130:1dec54e4aec3 114 uint32_t counter, counter2;
mbed_official 130:1dec54e4aec3 115 if (!us_ticker_inited) us_ticker_init();
mbed_official 130:1dec54e4aec3 116 // A situation might appear when Master overflows right after Slave is read and before the
mbed_official 130:1dec54e4aec3 117 // new (overflowed) value of Master is read. Which would make the code below consider the
mbed_official 130:1dec54e4aec3 118 // previous (incorrect) value of Slave and the new value of Master, which would return a
mbed_official 130:1dec54e4aec3 119 // value in the past. Avoid this by computing consecutive values of the timer until they
mbed_official 130:1dec54e4aec3 120 // are properly ordered.
mbed_official 130:1dec54e4aec3 121 counter = (uint32_t)(SlaveCounter << 16);
mbed_official 130:1dec54e4aec3 122 counter += TIM_MST->CNT;
mbed_official 130:1dec54e4aec3 123 while (1) {
mbed_official 130:1dec54e4aec3 124 counter2 = (uint32_t)(SlaveCounter << 16);
mbed_official 130:1dec54e4aec3 125 counter2 += TIM_MST->CNT;
mbed_official 130:1dec54e4aec3 126 if (counter2 > counter) {
mbed_official 130:1dec54e4aec3 127 break;
mbed_official 130:1dec54e4aec3 128 }
mbed_official 130:1dec54e4aec3 129 counter = counter2;
mbed_official 130:1dec54e4aec3 130 }
mbed_official 130:1dec54e4aec3 131 return counter2;
mbed_official 130:1dec54e4aec3 132 }
mbed_official 130:1dec54e4aec3 133
mbed_official 130:1dec54e4aec3 134 void us_ticker_set_interrupt(unsigned int timestamp) {
mbed_official 130:1dec54e4aec3 135 int delta = (int)(timestamp - us_ticker_read());
mbed_official 130:1dec54e4aec3 136 uint16_t cval = TIM_MST->CNT;
mbed_official 130:1dec54e4aec3 137
mbed_official 130:1dec54e4aec3 138 if (delta <= 0) { // This event was in the past
mbed_official 130:1dec54e4aec3 139 us_ticker_irq_handler();
mbed_official 240:9a7c54113eaf 140 } else {
mbed_official 130:1dec54e4aec3 141 oc_int_part = (uint32_t)(delta >> 16);
mbed_official 130:1dec54e4aec3 142 oc_rem_part = (uint16_t)(delta & 0xFFFF);
mbed_official 130:1dec54e4aec3 143 if (oc_rem_part <= (0xFFFF - cval)) {
mbed_official 130:1dec54e4aec3 144 set_compare(cval + oc_rem_part);
mbed_official 130:1dec54e4aec3 145 oc_rem_part = 0;
mbed_official 130:1dec54e4aec3 146 } else {
mbed_official 130:1dec54e4aec3 147 set_compare(0xFFFF);
mbed_official 130:1dec54e4aec3 148 oc_rem_part = oc_rem_part - (0xFFFF - cval);
mbed_official 130:1dec54e4aec3 149 }
mbed_official 130:1dec54e4aec3 150 }
mbed_official 130:1dec54e4aec3 151 }
mbed_official 130:1dec54e4aec3 152
mbed_official 130:1dec54e4aec3 153 void us_ticker_disable_interrupt(void) {
mbed_official 130:1dec54e4aec3 154 TIM_ITConfig(TIM_MST, TIM_IT_CC1, DISABLE);
mbed_official 130:1dec54e4aec3 155 }
mbed_official 130:1dec54e4aec3 156
mbed_official 130:1dec54e4aec3 157 void us_ticker_clear_interrupt(void) {
mbed_official 130:1dec54e4aec3 158 if (TIM_GetITStatus(TIM_MST, TIM_IT_CC1) == SET) {
mbed_official 130:1dec54e4aec3 159 TIM_ClearITPendingBit(TIM_MST, TIM_IT_CC1);
mbed_official 130:1dec54e4aec3 160 }
mbed_official 130:1dec54e4aec3 161 }