Lancaster University / microbit-dal

mbed.org local branch of microbit-dal. The real version lives in git at https://github.com/lancaster-university/microbit-dal

Dependencies:   BLE_API nRF51822 mbed-dev-bin

Dependents:   microbit Microbit IoTChallenge1 microbit ... more

source/drivers/MicroBitButton.cpp@73:eb91bba49623, 2016-07-13 (annotated)

Committer:
JonnyA
Date:
Wed Jul 13 14:32:54 2016 +0000
Revision:
73:eb91bba49623
Parent:
1:8aa5cdb4ab67 
Link to latest mbed-dev-bin (mbed library)

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 }