Philip Holifield / microbit-dal

from bbc microbit library

Dependencies:   BLE_API mbed-dev-bin nRF51822

Dependents:   microbit

Fork of microbit-dal by Lancaster University

inc/core/MicroBitSystemTimer.h@35:8ce23bc1af38, 2016-07-13 (annotated)

Committer:
LancasterUniversity
Date:
Wed Jul 13 12:18:14 2016 +0100
Revision:
35:8ce23bc1af38
Parent:
32:ece16b5987dd
Child:
37:b624ae5e94a5
Synchronized with git rev 732971e7

Author: James Devine

microbit-dal: Added events to MicroBitPin



Added rise, fall, pulse HI and LO events.



The pulse Hi and LO event timestamp given in the MicroBitEvent is the

duration for which the input was HI or LO for.



eventOn(int eventType) is used to configure the events generated

from the pin instance.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Jonathan Austin 1:8aa5cdb4ab67 1 /*
Jonathan Austin 1:8aa5cdb4ab67 2 The MIT License (MIT)
Jonathan Austin 1:8aa5cdb4ab67 3
Jonathan Austin 1:8aa5cdb4ab67 4 Copyright (c) 2016 British Broadcasting Corporation.
Jonathan Austin 1:8aa5cdb4ab67 5 This software is provided by Lancaster University by arrangement with the BBC.
Jonathan Austin 1:8aa5cdb4ab67 6
Jonathan Austin 1:8aa5cdb4ab67 7 Permission is hereby granted, free of charge, to any person obtaining a
Jonathan Austin 1:8aa5cdb4ab67 8 copy of this software and associated documentation files (the "Software"),
Jonathan Austin 1:8aa5cdb4ab67 9 to deal in the Software without restriction, including without limitation
Jonathan Austin 1:8aa5cdb4ab67 10 the rights to use, copy, modify, merge, publish, distribute, sublicense,
Jonathan Austin 1:8aa5cdb4ab67 11 and/or sell copies of the Software, and to permit persons to whom the
Jonathan Austin 1:8aa5cdb4ab67 12 Software is furnished to do so, subject to the following conditions:
Jonathan Austin 1:8aa5cdb4ab67 13
Jonathan Austin 1:8aa5cdb4ab67 14 The above copyright notice and this permission notice shall be included in
Jonathan Austin 1:8aa5cdb4ab67 15 all copies or substantial portions of the Software.
Jonathan Austin 1:8aa5cdb4ab67 16
Jonathan Austin 1:8aa5cdb4ab67 17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Jonathan Austin 1:8aa5cdb4ab67 18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Jonathan Austin 1:8aa5cdb4ab67 19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
Jonathan Austin 1:8aa5cdb4ab67 20 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 21 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
Jonathan Austin 1:8aa5cdb4ab67 22 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 23 DEALINGS IN THE SOFTWARE.
Jonathan Austin 1:8aa5cdb4ab67 24 */
Jonathan Austin 1:8aa5cdb4ab67 25
Jonathan Austin 1:8aa5cdb4ab67 26 /**
Jonathan Austin 1:8aa5cdb4ab67 27 * Definitions for the MicroBit system timer.
Jonathan Austin 1:8aa5cdb4ab67 28 *
Jonathan Austin 1:8aa5cdb4ab67 29 * This module provides:
Jonathan Austin 1:8aa5cdb4ab67 30 *
Jonathan Austin 1:8aa5cdb4ab67 31 * 1) a concept of global system time since power up
Jonathan Austin 1:8aa5cdb4ab67 32 * 2) a simple periodic multiplexing API for the underlying mbed implementation.
Jonathan Austin 1:8aa5cdb4ab67 33 *
Jonathan Austin 1:8aa5cdb4ab67 34 * The latter is useful to avoid costs associated with multiple mbed Ticker instances
Jonathan Austin 1:8aa5cdb4ab67 35 * in microbit-dal components, as each incurs a significant additional RAM overhead (circa 80 bytes).
Jonathan Austin 1:8aa5cdb4ab67 36 */
Jonathan Austin 1:8aa5cdb4ab67 37
Jonathan Austin 1:8aa5cdb4ab67 38 #ifndef MICROBIT_SYSTEM_TIMER_H
Jonathan Austin 1:8aa5cdb4ab67 39 #define MICROBIT_SYSTEM_TIMER_H
Jonathan Austin 1:8aa5cdb4ab67 40
Jonathan Austin 1:8aa5cdb4ab67 41 #include "mbed.h"
Jonathan Austin 1:8aa5cdb4ab67 42 #include "MicroBitConfig.h"
Jonathan Austin 1:8aa5cdb4ab67 43 #include "MicroBitComponent.h"
Jonathan Austin 1:8aa5cdb4ab67 44
Jonathan Austin 1:8aa5cdb4ab67 45 /**
LancasterUniversity 35:8ce23bc1af38 46 * Initialises a system wide timer, used to drive the various components used in the runtime.
Jonathan Austin 1:8aa5cdb4ab67 47 *
Jonathan Austin 1:8aa5cdb4ab67 48 * This must be called before any components register to receive periodic periodic callbacks.
Jonathan Austin 1:8aa5cdb4ab67 49 *
Jonathan Austin 1:8aa5cdb4ab67 50 * @param timer_period The initial period between interrupts, in millseconds.
Jonathan Austin 1:8aa5cdb4ab67 51 *
Jonathan Austin 1:8aa5cdb4ab67 52 * @return MICROBIT_OK on success.
Jonathan Austin 1:8aa5cdb4ab67 53 */
Jonathan Austin 1:8aa5cdb4ab67 54 int system_timer_init(int period);
Jonathan Austin 1:8aa5cdb4ab67 55
Jonathan Austin 1:8aa5cdb4ab67 56 /**
Jonathan Austin 1:8aa5cdb4ab67 57 * Reconfigures the system wide timer to the given period in milliseconds.
Jonathan Austin 1:8aa5cdb4ab67 58 *
Jonathan Austin 1:8aa5cdb4ab67 59 * @param period the new period of the timer in milliseconds
Jonathan Austin 1:8aa5cdb4ab67 60 *
Jonathan Austin 1:8aa5cdb4ab67 61 * @return MICROBIT_OK on success. MICROBIT_INVALID_PARAMETER is returned if period < 1
Jonathan Austin 1:8aa5cdb4ab67 62 */
Jonathan Austin 1:8aa5cdb4ab67 63 int system_timer_set_period(int period);
Jonathan Austin 1:8aa5cdb4ab67 64
Jonathan Austin 1:8aa5cdb4ab67 65 /**
Jonathan Austin 1:8aa5cdb4ab67 66 * Accessor to obtain the current tick period in milliseconds
Jonathan Austin 1:8aa5cdb4ab67 67 *
Jonathan Austin 1:8aa5cdb4ab67 68 * @return the current tick period in milliseconds
Jonathan Austin 1:8aa5cdb4ab67 69 */
Jonathan Austin 1:8aa5cdb4ab67 70 int system_timer_get_period();
Jonathan Austin 1:8aa5cdb4ab67 71
Jonathan Austin 1:8aa5cdb4ab67 72 /**
LancasterUniversity 35:8ce23bc1af38 73 * Updates the current time in microseconds, since power on.
LancasterUniversity 35:8ce23bc1af38 74 *
LancasterUniversity 35:8ce23bc1af38 75 * If the mbed Timer hasn't been initialised, it will be initialised
LancasterUniversity 35:8ce23bc1af38 76 * on the first call to this function.
LancasterUniversity 35:8ce23bc1af38 77 */
LancasterUniversity 35:8ce23bc1af38 78 inline void update_time();
LancasterUniversity 35:8ce23bc1af38 79
LancasterUniversity 35:8ce23bc1af38 80 /**
Jonathan Austin 1:8aa5cdb4ab67 81 * Determines the time since the device was powered on.
Jonathan Austin 1:8aa5cdb4ab67 82 *
Jonathan Austin 1:8aa5cdb4ab67 83 * @return the current time since power on in milliseconds
Jonathan Austin 1:8aa5cdb4ab67 84 */
LancasterUniversity 35:8ce23bc1af38 85 uint64_t system_timer_current_time();
LancasterUniversity 35:8ce23bc1af38 86
LancasterUniversity 35:8ce23bc1af38 87 /**
LancasterUniversity 35:8ce23bc1af38 88 * Determines the time since the device was powered on.
LancasterUniversity 35:8ce23bc1af38 89 *
LancasterUniversity 35:8ce23bc1af38 90 * @return the current time since power on in microseconds
LancasterUniversity 35:8ce23bc1af38 91 */
LancasterUniversity 35:8ce23bc1af38 92 uint64_t system_timer_current_time_us();
Jonathan Austin 1:8aa5cdb4ab67 93
Jonathan Austin 1:8aa5cdb4ab67 94 /**
Jonathan Austin 1:8aa5cdb4ab67 95 * Timer callback. Called from interrupt context, once per period.
Jonathan Austin 1:8aa5cdb4ab67 96 *
Jonathan Austin 1:8aa5cdb4ab67 97 * Simply checks to determine if any fibers blocked on the sleep queue need to be woken up
Jonathan Austin 1:8aa5cdb4ab67 98 * and made runnable.
Jonathan Austin 1:8aa5cdb4ab67 99 */
Jonathan Austin 1:8aa5cdb4ab67 100 void system_timer_tick();
Jonathan Austin 1:8aa5cdb4ab67 101
Jonathan Austin 1:8aa5cdb4ab67 102 /**
Jonathan Austin 1:8aa5cdb4ab67 103 * Add a component to the array of system components. This component will then receive
Jonathan Austin 1:8aa5cdb4ab67 104 * periodic callbacks, once every tick period in interrupt context.
Jonathan Austin 1:8aa5cdb4ab67 105 *
Jonathan Austin 1:8aa5cdb4ab67 106 * @param component The component to add.
Jonathan Austin 1:8aa5cdb4ab67 107 *
Jonathan Austin 1:8aa5cdb4ab67 108 * @return MICROBIT_OK on success or MICROBIT_NO_RESOURCES if the component array is full.
Jonathan Austin 1:8aa5cdb4ab67 109 *
Jonathan Austin 1:8aa5cdb4ab67 110 * @code
Jonathan Austin 1:8aa5cdb4ab67 111 * // heap allocated - otherwise it will be paged out!
Jonathan Austin 1:8aa5cdb4ab67 112 * MicroBitDisplay* display = new MicroBitDisplay();
Jonathan Austin 1:8aa5cdb4ab67 113 *
Jonathan Austin 1:8aa5cdb4ab67 114 * system_timer_add_component(display);
Jonathan Austin 1:8aa5cdb4ab67 115 * @endcode
Jonathan Austin 1:8aa5cdb4ab67 116 */
Jonathan Austin 1:8aa5cdb4ab67 117 int system_timer_add_component(MicroBitComponent *component);
Jonathan Austin 1:8aa5cdb4ab67 118
Jonathan Austin 1:8aa5cdb4ab67 119 /**
Jonathan Austin 1:8aa5cdb4ab67 120 * Remove a component from the array of system components. This component will no longer receive
Jonathan Austin 1:8aa5cdb4ab67 121 * periodic callbacks.
Jonathan Austin 1:8aa5cdb4ab67 122 *
Jonathan Austin 1:8aa5cdb4ab67 123 * @param component The component to remove.
Jonathan Austin 1:8aa5cdb4ab67 124 *
Jonathan Austin 1:8aa5cdb4ab67 125 * @return MICROBIT_OK on success or MICROBIT_INVALID_PARAMETER is returned if the given component has not been previously added.
Jonathan Austin 1:8aa5cdb4ab67 126 *
Jonathan Austin 1:8aa5cdb4ab67 127 * @code
Jonathan Austin 1:8aa5cdb4ab67 128 * // heap allocated - otherwise it will be paged out!
Jonathan Austin 1:8aa5cdb4ab67 129 * MicroBitDisplay* display = new MicroBitDisplay();
Jonathan Austin 1:8aa5cdb4ab67 130 *
Jonathan Austin 1:8aa5cdb4ab67 131 * system_timer_add_component(display);
Jonathan Austin 1:8aa5cdb4ab67 132 *
Jonathan Austin 1:8aa5cdb4ab67 133 * system_timer_remove_component(display);
Jonathan Austin 1:8aa5cdb4ab67 134 * @endcode
Jonathan Austin 1:8aa5cdb4ab67 135 */
Jonathan Austin 1:8aa5cdb4ab67 136 int system_timer_remove_component(MicroBitComponent *component);
Jonathan Austin 1:8aa5cdb4ab67 137
Jonathan Austin 1:8aa5cdb4ab67 138 /**
Jonathan Austin 1:8aa5cdb4ab67 139 * A simple C/C++ wrapper to allow periodic callbacks to standard C functions transparently.
Jonathan Austin 1:8aa5cdb4ab67 140 */
Jonathan Austin 1:8aa5cdb4ab67 141 class MicroBitSystemTimerCallback : MicroBitComponent
Jonathan Austin 1:8aa5cdb4ab67 142 {
Jonathan Austin 1:8aa5cdb4ab67 143 void (*fn)(void);
Jonathan Austin 1:8aa5cdb4ab67 144
Jonathan Austin 1:8aa5cdb4ab67 145 /**
Jonathan Austin 1:8aa5cdb4ab67 146 * Creates an object that receives periodic callbacks from the system timer,
Jonathan Austin 1:8aa5cdb4ab67 147 * and, in turn, calls a plain C function as provided as a parameter.
Jonathan Austin 1:8aa5cdb4ab67 148 *
Jonathan Austin 1:8aa5cdb4ab67 149 * @param function the function to invoke upon a systemTick.
Jonathan Austin 1:8aa5cdb4ab67 150 */
Jonathan Austin 1:8aa5cdb4ab67 151 public:
Jonathan Austin 1:8aa5cdb4ab67 152 MicroBitSystemTimerCallback(void (*function)(void))
Jonathan Austin 1:8aa5cdb4ab67 153 {
Jonathan Austin 1:8aa5cdb4ab67 154 fn = function;
Jonathan Austin 1:8aa5cdb4ab67 155 system_timer_add_component(this);
Jonathan Austin 1:8aa5cdb4ab67 156 }
Jonathan Austin 1:8aa5cdb4ab67 157
Jonathan Austin 1:8aa5cdb4ab67 158 void systemTick()
Jonathan Austin 1:8aa5cdb4ab67 159 {
Jonathan Austin 1:8aa5cdb4ab67 160 fn();
Jonathan Austin 1:8aa5cdb4ab67 161 }
Jonathan Austin 1:8aa5cdb4ab67 162 };
Jonathan Austin 1:8aa5cdb4ab67 163
LancasterUniversity 31:87789e55bac7 164 #endif