Martin Woolley / microbit-dal

Solution for Bluetooth SIG hands-on training course

Dependencies:   BLE_API mbed-dev-bin nRF51822-bluetooth-mdw

Dependents:   microbit

Fork of microbit-dal-bluetooth-mdw_starter by Martin Woolley

source/drivers/MicroBitButton.cpp@22:23d7b9a4b082, 2016-07-13 (annotated)

Committer:
LancasterUniversity
Date:
Wed Jul 13 12:17:54 2016 +0100
Revision:
22:23d7b9a4b082
Parent:
1:8aa5cdb4ab67 
Synchronized with git rev 7cf98c22

Author: James Devine

microbit-dal: patch for fiber_wake_on_event



fiber_wake_on_event used to crash after forking a FOB fiber.



It would attempt to obtain a new fiber context, and would place it on the wait queue.

Then when that fiber was paged in, the context of that fiber would not have been

initialised, as the function presumed schedule would be called immediately after

fiber initialisation.



This patch catches that edge case.

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 #include "MicroBitConfig.h"
Jonathan Austin 1:8aa5cdb4ab67 27 #include "MicroBitButton.h"
Jonathan Austin 1:8aa5cdb4ab67 28 #include "MicroBitSystemTimer.h"
Jonathan Austin 1:8aa5cdb4ab67 29
Jonathan Austin 1:8aa5cdb4ab67 30 /**
Jonathan Austin 1:8aa5cdb4ab67 31 * Constructor.
Jonathan Austin 1:8aa5cdb4ab67 32 *
Jonathan Austin 1:8aa5cdb4ab67 33 * Create a software representation of a button.
Jonathan Austin 1:8aa5cdb4ab67 34 *
Jonathan Austin 1:8aa5cdb4ab67 35 * @param name the physical pin on the processor that should be used as input.
Jonathan Austin 1:8aa5cdb4ab67 36 *
Jonathan Austin 1:8aa5cdb4ab67 37 * @param id the ID of the new MicroBitButton object.
Jonathan Austin 1:8aa5cdb4ab67 38 *
Jonathan Austin 1:8aa5cdb4ab67 39 * @param eventConfiguration Configures the events that will be generated by this MicroBitButton instance.
Jonathan Austin 1:8aa5cdb4ab67 40 * Defaults to MICROBIT_BUTTON_ALL_EVENTS.
Jonathan Austin 1:8aa5cdb4ab67 41 *
Jonathan Austin 1:8aa5cdb4ab67 42 * @param mode the configuration of internal pullups/pulldowns, as defined in the mbed PinMode class. PullNone by default.
Jonathan Austin 1:8aa5cdb4ab67 43 *
Jonathan Austin 1:8aa5cdb4ab67 44 * @code
Jonathan Austin 1:8aa5cdb4ab67 45 * buttonA(MICROBIT_PIN_BUTTON_A, MICROBIT_ID_BUTTON_A);
Jonathan Austin 1:8aa5cdb4ab67 46 * @endcode
Jonathan Austin 1:8aa5cdb4ab67 47 */
Jonathan Austin 1:8aa5cdb4ab67 48 MicroBitButton::MicroBitButton(PinName name, uint16_t id, MicroBitButtonEventConfiguration eventConfiguration, PinMode mode) : pin(name, mode)
Jonathan Austin 1:8aa5cdb4ab67 49 {
Jonathan Austin 1:8aa5cdb4ab67 50 this->id = id;
Jonathan Austin 1:8aa5cdb4ab67 51 this->name = name;
Jonathan Austin 1:8aa5cdb4ab67 52 this->eventConfiguration = eventConfiguration;
Jonathan Austin 1:8aa5cdb4ab67 53 this->downStartTime = 0;
Jonathan Austin 1:8aa5cdb4ab67 54 this->sigma = 0;
Jonathan Austin 1:8aa5cdb4ab67 55 system_timer_add_component(this);
Jonathan Austin 1:8aa5cdb4ab67 56 }
Jonathan Austin 1:8aa5cdb4ab67 57
Jonathan Austin 1:8aa5cdb4ab67 58 /**
Jonathan Austin 1:8aa5cdb4ab67 59 * Changes the event configuration used by this button to the given MicroBitButtonEventConfiguration.
Jonathan Austin 1:8aa5cdb4ab67 60 *
Jonathan Austin 1:8aa5cdb4ab67 61 * All subsequent events generated by this button will then be informed by this configuraiton.
Jonathan Austin 1:8aa5cdb4ab67 62 *
Jonathan Austin 1:8aa5cdb4ab67 63 * @param config The new configuration for this button. Legal values are MICROBIT_BUTTON_ALL_EVENTS or MICROBIT_BUTTON_SIMPLE_EVENTS.
Jonathan Austin 1:8aa5cdb4ab67 64 *
Jonathan Austin 1:8aa5cdb4ab67 65 * Example:
Jonathan Austin 1:8aa5cdb4ab67 66 * @code
Jonathan Austin 1:8aa5cdb4ab67 67 * // Configure a button to generate all possible events.
Jonathan Austin 1:8aa5cdb4ab67 68 * buttonA.setEventConfiguration(MICROBIT_BUTTON_ALL_EVENTS);
Jonathan Austin 1:8aa5cdb4ab67 69 *
Jonathan Austin 1:8aa5cdb4ab67 70 * // Configure a button to suppress MICROBIT_BUTTON_EVT_CLICK and MICROBIT_BUTTON_EVT_LONG_CLICK events.
Jonathan Austin 1:8aa5cdb4ab67 71 * buttonA.setEventConfiguration(MICROBIT_BUTTON_SIMPLE_EVENTS);
Jonathan Austin 1:8aa5cdb4ab67 72 * @endcode
Jonathan Austin 1:8aa5cdb4ab67 73 */
Jonathan Austin 1:8aa5cdb4ab67 74 void MicroBitButton::setEventConfiguration(MicroBitButtonEventConfiguration config)
Jonathan Austin 1:8aa5cdb4ab67 75 {
Jonathan Austin 1:8aa5cdb4ab67 76 this->eventConfiguration = config;
Jonathan Austin 1:8aa5cdb4ab67 77 }
Jonathan Austin 1:8aa5cdb4ab67 78
Jonathan Austin 1:8aa5cdb4ab67 79 /**
Jonathan Austin 1:8aa5cdb4ab67 80 * periodic callback from MicroBit system timer.
Jonathan Austin 1:8aa5cdb4ab67 81 *
Jonathan Austin 1:8aa5cdb4ab67 82 * Check for state change for this button, and fires various events on a state change.
Jonathan Austin 1:8aa5cdb4ab67 83 */
Jonathan Austin 1:8aa5cdb4ab67 84 void MicroBitButton::systemTick()
Jonathan Austin 1:8aa5cdb4ab67 85 {
Jonathan Austin 1:8aa5cdb4ab67 86 //
Jonathan Austin 1:8aa5cdb4ab67 87 // If the pin is pulled low (touched), increment our culumative counter.
Jonathan Austin 1:8aa5cdb4ab67 88 // otherwise, decrement it. We're essentially building a lazy follower here.
Jonathan Austin 1:8aa5cdb4ab67 89 // This makes the output debounced for buttons, and desensitizes touch sensors
Jonathan Austin 1:8aa5cdb4ab67 90 // (particularly in environments where there is mains noise!)
Jonathan Austin 1:8aa5cdb4ab67 91 //
Jonathan Austin 1:8aa5cdb4ab67 92 if(!pin)
Jonathan Austin 1:8aa5cdb4ab67 93 {
Jonathan Austin 1:8aa5cdb4ab67 94 if (sigma < MICROBIT_BUTTON_SIGMA_MAX)
Jonathan Austin 1:8aa5cdb4ab67 95 sigma++;
Jonathan Austin 1:8aa5cdb4ab67 96 }
Jonathan Austin 1:8aa5cdb4ab67 97 else
Jonathan Austin 1:8aa5cdb4ab67 98 {
Jonathan Austin 1:8aa5cdb4ab67 99 if (sigma > MICROBIT_BUTTON_SIGMA_MIN)
Jonathan Austin 1:8aa5cdb4ab67 100 sigma--;
Jonathan Austin 1:8aa5cdb4ab67 101 }
Jonathan Austin 1:8aa5cdb4ab67 102
Jonathan Austin 1:8aa5cdb4ab67 103 // Check to see if we have off->on state change.
Jonathan Austin 1:8aa5cdb4ab67 104 if(sigma > MICROBIT_BUTTON_SIGMA_THRESH_HI && !(status & MICROBIT_BUTTON_STATE))
Jonathan Austin 1:8aa5cdb4ab67 105 {
Jonathan Austin 1:8aa5cdb4ab67 106 // Record we have a state change, and raise an event.
Jonathan Austin 1:8aa5cdb4ab67 107 status |= MICROBIT_BUTTON_STATE;
Jonathan Austin 1:8aa5cdb4ab67 108 MicroBitEvent evt(id,MICROBIT_BUTTON_EVT_DOWN);
Jonathan Austin 1:8aa5cdb4ab67 109
Jonathan Austin 1:8aa5cdb4ab67 110 //Record the time the button was pressed.
Jonathan Austin 1:8aa5cdb4ab67 111 downStartTime = system_timer_current_time();
Jonathan Austin 1:8aa5cdb4ab67 112 }
Jonathan Austin 1:8aa5cdb4ab67 113
Jonathan Austin 1:8aa5cdb4ab67 114 // Check to see if we have on->off state change.
Jonathan Austin 1:8aa5cdb4ab67 115 if(sigma < MICROBIT_BUTTON_SIGMA_THRESH_LO && (status & MICROBIT_BUTTON_STATE))
Jonathan Austin 1:8aa5cdb4ab67 116 {
Jonathan Austin 1:8aa5cdb4ab67 117 status = 0;
Jonathan Austin 1:8aa5cdb4ab67 118 MicroBitEvent evt(id,MICROBIT_BUTTON_EVT_UP);
Jonathan Austin 1:8aa5cdb4ab67 119
Jonathan Austin 1:8aa5cdb4ab67 120 if (eventConfiguration == MICROBIT_BUTTON_ALL_EVENTS)
Jonathan Austin 1:8aa5cdb4ab67 121 {
Jonathan Austin 1:8aa5cdb4ab67 122 //determine if this is a long click or a normal click and send event
Jonathan Austin 1:8aa5cdb4ab67 123 if((system_timer_current_time() - downStartTime) >= MICROBIT_BUTTON_LONG_CLICK_TIME)
Jonathan Austin 1:8aa5cdb4ab67 124 MicroBitEvent evt(id,MICROBIT_BUTTON_EVT_LONG_CLICK);
Jonathan Austin 1:8aa5cdb4ab67 125 else
Jonathan Austin 1:8aa5cdb4ab67 126 MicroBitEvent evt(id,MICROBIT_BUTTON_EVT_CLICK);
Jonathan Austin 1:8aa5cdb4ab67 127 }
Jonathan Austin 1:8aa5cdb4ab67 128 }
Jonathan Austin 1:8aa5cdb4ab67 129
Jonathan Austin 1:8aa5cdb4ab67 130 //if button is pressed and the hold triggered event state is not triggered AND we are greater than the button debounce value
Jonathan Austin 1:8aa5cdb4ab67 131 if((status & MICROBIT_BUTTON_STATE) && !(status & MICROBIT_BUTTON_STATE_HOLD_TRIGGERED) && (system_timer_current_time() - downStartTime) >= MICROBIT_BUTTON_HOLD_TIME)
Jonathan Austin 1:8aa5cdb4ab67 132 {
Jonathan Austin 1:8aa5cdb4ab67 133 //set the hold triggered event flag
Jonathan Austin 1:8aa5cdb4ab67 134 status |= MICROBIT_BUTTON_STATE_HOLD_TRIGGERED;
Jonathan Austin 1:8aa5cdb4ab67 135
Jonathan Austin 1:8aa5cdb4ab67 136 //fire hold event
Jonathan Austin 1:8aa5cdb4ab67 137 MicroBitEvent evt(id,MICROBIT_BUTTON_EVT_HOLD);
Jonathan Austin 1:8aa5cdb4ab67 138 }
Jonathan Austin 1:8aa5cdb4ab67 139 }
Jonathan Austin 1:8aa5cdb4ab67 140
Jonathan Austin 1:8aa5cdb4ab67 141 /**
Jonathan Austin 1:8aa5cdb4ab67 142 * Tests if this Button is currently pressed.
Jonathan Austin 1:8aa5cdb4ab67 143 *
Jonathan Austin 1:8aa5cdb4ab67 144 * @code
Jonathan Austin 1:8aa5cdb4ab67 145 * if(buttonA.isPressed())
Jonathan Austin 1:8aa5cdb4ab67 146 * display.scroll("Pressed!");
Jonathan Austin 1:8aa5cdb4ab67 147 * @endcode
Jonathan Austin 1:8aa5cdb4ab67 148 *
Jonathan Austin 1:8aa5cdb4ab67 149 * @return 1 if this button is pressed, 0 otherwise.
Jonathan Austin 1:8aa5cdb4ab67 150 */
Jonathan Austin 1:8aa5cdb4ab67 151 int MicroBitButton::isPressed()
Jonathan Austin 1:8aa5cdb4ab67 152 {
Jonathan Austin 1:8aa5cdb4ab67 153 return status & MICROBIT_BUTTON_STATE ? 1 : 0;
Jonathan Austin 1:8aa5cdb4ab67 154 }
Jonathan Austin 1:8aa5cdb4ab67 155
Jonathan Austin 1:8aa5cdb4ab67 156 /**
Jonathan Austin 1:8aa5cdb4ab67 157 * Destructor for MicroBitButton, where we deregister this instance from the array of fiber components.
Jonathan Austin 1:8aa5cdb4ab67 158 */
Jonathan Austin 1:8aa5cdb4ab67 159 MicroBitButton::~MicroBitButton()
Jonathan Austin 1:8aa5cdb4ab67 160 {
Jonathan Austin 1:8aa5cdb4ab67 161 system_timer_remove_component(this);
Jonathan Austin 1:8aa5cdb4ab67 162 }