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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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

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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

common/ticker_api.c@635:a11c0372f0ba, 2015-09-30 (annotated)

Committer:
mbed_official
Date:
Wed Sep 30 17:00:09 2015 +0100
Revision:
635:a11c0372f0ba
Parent:
525:c320967f86b9 
Synchronized with git revision d29c98dae61be0946ddf3a3c641c7726056f9452



Full URL: https://github.com/mbedmicro/mbed/commit/d29c98dae61be0946ddf3a3c641c7726056f9452/



Added support for SAMW25

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 525:c320967f86b9 1 /* mbed Microcontroller Library
mbed_official 525:c320967f86b9 2 * Copyright (c) 2015 ARM Limited
mbed_official 525:c320967f86b9 3 *
mbed_official 525:c320967f86b9 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 525:c320967f86b9 5 * you may not use this file except in compliance with the License.
mbed_official 525:c320967f86b9 6 * You may obtain a copy of the License at
mbed_official 525:c320967f86b9 7 *
mbed_official 525:c320967f86b9 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 525:c320967f86b9 9 *
mbed_official 525:c320967f86b9 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 525:c320967f86b9 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 525:c320967f86b9 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 525:c320967f86b9 13 * See the License for the specific language governing permissions and
mbed_official 525:c320967f86b9 14 * limitations under the License.
mbed_official 525:c320967f86b9 15 */
mbed_official 525:c320967f86b9 16 #include <stddef.h>
mbed_official 525:c320967f86b9 17 #include "ticker_api.h"
mbed_official 525:c320967f86b9 18 #include "cmsis.h"
mbed_official 525:c320967f86b9 19
mbed_official 525:c320967f86b9 20 void ticker_set_handler(const ticker_data_t *const data, ticker_event_handler handler) {
mbed_official 525:c320967f86b9 21 data->interface->init();
mbed_official 525:c320967f86b9 22
mbed_official 525:c320967f86b9 23 data->queue->event_handler = handler;
mbed_official 525:c320967f86b9 24 }
mbed_official 525:c320967f86b9 25
mbed_official 525:c320967f86b9 26 void ticker_irq_handler(const ticker_data_t *const data) {
mbed_official 525:c320967f86b9 27 data->interface->clear_interrupt();
mbed_official 525:c320967f86b9 28
mbed_official 525:c320967f86b9 29 /* Go through all the pending TimerEvents */
mbed_official 525:c320967f86b9 30 while (1) {
mbed_official 525:c320967f86b9 31 if (data->queue->head == NULL) {
mbed_official 525:c320967f86b9 32 // There are no more TimerEvents left, so disable matches.
mbed_official 525:c320967f86b9 33 data->interface->disable_interrupt();
mbed_official 525:c320967f86b9 34 return;
mbed_official 525:c320967f86b9 35 }
mbed_official 525:c320967f86b9 36
mbed_official 525:c320967f86b9 37 if ((int)(data->queue->head->timestamp - data->interface->read()) <= 0) {
mbed_official 525:c320967f86b9 38 // This event was in the past:
mbed_official 525:c320967f86b9 39 // point to the following one and execute its handler
mbed_official 525:c320967f86b9 40 ticker_event_t *p = data->queue->head;
mbed_official 525:c320967f86b9 41 data->queue->head = data->queue->head->next;
mbed_official 525:c320967f86b9 42 if (data->queue->event_handler != NULL) {
mbed_official 525:c320967f86b9 43 (*data->queue->event_handler)(p->id); // NOTE: the handler can set new events
mbed_official 525:c320967f86b9 44 }
mbed_official 525:c320967f86b9 45 /* Note: We continue back to examining the head because calling the
mbed_official 525:c320967f86b9 46 * event handler may have altered the chain of pending events. */
mbed_official 525:c320967f86b9 47 } else {
mbed_official 525:c320967f86b9 48 // This event and the following ones in the list are in the future:
mbed_official 525:c320967f86b9 49 // set it as next interrupt and return
mbed_official 525:c320967f86b9 50 data->interface->set_interrupt(data->queue->head->timestamp);
mbed_official 525:c320967f86b9 51 return;
mbed_official 525:c320967f86b9 52 }
mbed_official 525:c320967f86b9 53 }
mbed_official 525:c320967f86b9 54 }
mbed_official 525:c320967f86b9 55
mbed_official 525:c320967f86b9 56 void ticker_insert_event(const ticker_data_t *const data, ticker_event_t *obj, timestamp_t timestamp, uint32_t id) {
mbed_official 525:c320967f86b9 57 /* disable interrupts for the duration of the function */
mbed_official 525:c320967f86b9 58 __disable_irq();
mbed_official 525:c320967f86b9 59
mbed_official 525:c320967f86b9 60 // initialise our data
mbed_official 525:c320967f86b9 61 obj->timestamp = timestamp;
mbed_official 525:c320967f86b9 62 obj->id = id;
mbed_official 525:c320967f86b9 63
mbed_official 525:c320967f86b9 64 /* Go through the list until we either reach the end, or find
mbed_official 525:c320967f86b9 65 an element this should come before (which is possibly the
mbed_official 525:c320967f86b9 66 head). */
mbed_official 525:c320967f86b9 67 ticker_event_t *prev = NULL, *p = data->queue->head;
mbed_official 525:c320967f86b9 68 while (p != NULL) {
mbed_official 525:c320967f86b9 69 /* check if we come before p */
mbed_official 525:c320967f86b9 70 if ((int)(timestamp - p->timestamp) < 0) {
mbed_official 525:c320967f86b9 71 break;
mbed_official 525:c320967f86b9 72 }
mbed_official 525:c320967f86b9 73 /* go to the next element */
mbed_official 525:c320967f86b9 74 prev = p;
mbed_official 525:c320967f86b9 75 p = p->next;
mbed_official 525:c320967f86b9 76 }
mbed_official 525:c320967f86b9 77 /* if prev is NULL we're at the head */
mbed_official 525:c320967f86b9 78 if (prev == NULL) {
mbed_official 525:c320967f86b9 79 data->queue->head = obj;
mbed_official 525:c320967f86b9 80 data->interface->set_interrupt(timestamp);
mbed_official 525:c320967f86b9 81 } else {
mbed_official 525:c320967f86b9 82 prev->next = obj;
mbed_official 525:c320967f86b9 83 }
mbed_official 525:c320967f86b9 84 /* if we're at the end p will be NULL, which is correct */
mbed_official 525:c320967f86b9 85 obj->next = p;
mbed_official 525:c320967f86b9 86
mbed_official 525:c320967f86b9 87 __enable_irq();
mbed_official 525:c320967f86b9 88 }
mbed_official 525:c320967f86b9 89
mbed_official 525:c320967f86b9 90 void ticker_remove_event(const ticker_data_t *const data, ticker_event_t *obj) {
mbed_official 525:c320967f86b9 91 __disable_irq();
mbed_official 525:c320967f86b9 92
mbed_official 525:c320967f86b9 93 // remove this object from the list
mbed_official 525:c320967f86b9 94 if (data->queue->head == obj) {
mbed_official 525:c320967f86b9 95 // first in the list, so just drop me
mbed_official 525:c320967f86b9 96 data->queue->head = obj->next;
mbed_official 525:c320967f86b9 97 if (data->queue->head == NULL) {
mbed_official 525:c320967f86b9 98 data->interface->disable_interrupt();
mbed_official 525:c320967f86b9 99 } else {
mbed_official 525:c320967f86b9 100 data->interface->set_interrupt(data->queue->head->timestamp);
mbed_official 525:c320967f86b9 101 }
mbed_official 525:c320967f86b9 102 } else {
mbed_official 525:c320967f86b9 103 // find the object before me, then drop me
mbed_official 525:c320967f86b9 104 ticker_event_t* p = data->queue->head;
mbed_official 525:c320967f86b9 105 while (p != NULL) {
mbed_official 525:c320967f86b9 106 if (p->next == obj) {
mbed_official 525:c320967f86b9 107 p->next = obj->next;
mbed_official 525:c320967f86b9 108 break;
mbed_official 525:c320967f86b9 109 }
mbed_official 525:c320967f86b9 110 p = p->next;
mbed_official 525:c320967f86b9 111 }
mbed_official 525:c320967f86b9 112 }
mbed_official 525:c320967f86b9 113
mbed_official 525:c320967f86b9 114 __enable_irq();
mbed_official 525:c320967f86b9 115 }
mbed_official 525:c320967f86b9 116
mbed_official 525:c320967f86b9 117 timestamp_t ticker_read(const ticker_data_t *const data)
mbed_official 525:c320967f86b9 118 {
mbed_official 525:c320967f86b9 119 return data->interface->read();
mbed_official 525:c320967f86b9 120 }
mbed_official 525:c320967f86b9 121
mbed_official 525:c320967f86b9 122 int ticker_get_next_timestamp(const ticker_data_t *const data, timestamp_t *timestamp)
mbed_official 525:c320967f86b9 123 {
mbed_official 525:c320967f86b9 124 int ret = 0;
mbed_official 525:c320967f86b9 125
mbed_official 525:c320967f86b9 126 /* if head is NULL, there are no pending events */
mbed_official 525:c320967f86b9 127 __disable_irq();
mbed_official 525:c320967f86b9 128 if (data->queue->head != NULL) {
mbed_official 525:c320967f86b9 129 *timestamp = data->queue->head->timestamp;
mbed_official 525:c320967f86b9 130 ret = 1;
mbed_official 525:c320967f86b9 131 }
mbed_official 525:c320967f86b9 132 __enable_irq();
mbed_official 525:c320967f86b9 133
mbed_official 525:c320967f86b9 134 return ret;
mbed_official 525:c320967f86b9 135 }