MicroBitValueService.cpp

00001 /*
00002 The MIT License (MIT)
00003 
00004 Copyright (c) 2016 British Broadcasting Corporation.
00005 This software is provided by Lancaster University by arrangement with the BBC.
00006 
00007 Permission is hereby granted, free of charge, to any person obtaining a
00008 copy of this software and associated documentation files (the "Software"),
00009 to deal in the Software without restriction, including without limitation
00010 the rights to use, copy, modify, merge, publish, distribute, sublicense,
00011 and/or sell copies of the Software, and to permit persons to whom the
00012 Software is furnished to do so, subject to the following conditions:
00013 
00014 The above copyright notice and this permission notice shall be included in
00015 all copies or substantial portions of the Software.
00016 
00017 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00018 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00019 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
00020 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00021 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
00022 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
00023 DEALINGS IN THE SOFTWARE.
00024 */
00025 
00026 /**
00027   * Class definition for the MicroBit BLE Magnetometer Service.
00028   * Provides access to live magnetometer data via BLE, and provides basic configuration options.
00029   */
00030 #include "MicroBitConfig.h"
00031 #include "ble/UUID.h"
00032 
00033 #include "MicroBitValueService.h"
00034 
00035 /**
00036   * Constructor.
00037   * Create a representation of the MagnetometerService.
00038   * @param _ble The instance of a BLE device that we're running on.
00039   * @param _compass An instance of MicroBitCompass to use as our Magnetometer source.
00040   */
00041 MicroBitValueService::MicroBitValueService(BLEDevice &_ble, uint16_t *_value) :
00042         ble(_ble), value(_value)
00043 {
00044 #if CONFIG_ENABLED(MICROBIT_DBG)
00045     if(SERIAL_DEBUG) SERIAL_DEBUG->printf("MicroBitValueService::MicroBitValueService value = %i\r\n", *value);
00046 #endif
00047     // Create the data structures that represent each of our characteristics in Soft Device.
00048 
00049     GattCharacteristic  valueCharacteristic(MicroBitValueServiceDataUUID, (uint8_t *)&valueCharacteristicBuffer, 0,
00050     sizeof(valueCharacteristicBuffer),
00051     GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE);
00052 
00053     // Initialise our characteristic values.
00054     valueCharacteristicBuffer = *value;
00055 
00056     // Set default security requirements
00057     valueCharacteristic.requireSecurity(SecurityManager::MICROBIT_BLE_SECURITY_LEVEL);
00058 
00059     GattCharacteristic *characteristics[] = {&valueCharacteristic};
00060     GattService         service(MicroBitValueServiceUUID, characteristics, sizeof(characteristics) / sizeof(GattCharacteristic *));
00061 
00062     ble.addService(service);
00063 
00064     valueCharacteristicHandle = valueCharacteristic.getValueHandle();
00065 
00066     ble.gattServer().write(valueCharacteristicHandle, (const uint8_t *)&valueCharacteristicBuffer, sizeof(valueCharacteristicBuffer));
00067 
00068     ble.gattServer().onDataWritten(this, &MicroBitValueService::onDataWritten);
00069 
00070     if (EventModel::defaultEventBus)
00071     {
00072         EventModel::defaultEventBus->listen(MICROBIT_ID_VALUE, MICROBIT_VALUE_EVT_UPDATE, this, &MicroBitValueService::valueUpdate, MESSAGE_BUS_LISTENER_IMMEDIATE);
00073     }
00074 }
00075 
00076 /**
00077   * Callback. Invoked when any of our attributes are written via BLE.
00078   */
00079 void MicroBitValueService::onDataWritten(const GattWriteCallbackParams *params)
00080 {
00081 
00082     if (params->handle == valueCharacteristicHandle && params->len >= sizeof(valueCharacteristicBuffer))
00083     {
00084         valueCharacteristicBuffer = *((uint16_t *)params->data);
00085         *value = valueCharacteristicBuffer;
00086         //MicroBitEvent e(41, MICROBIT_VALUE_EVT_UPDATE);
00087     }
00088 }
00089 
00090 /**
00091   * Magnetometer update callback
00092   */
00093 void MicroBitValueService::valueUpdate(MicroBitEvent)
00094 {
00095     
00096 #if CONFIG_ENABLED(MICROBIT_DBG)
00097     if(SERIAL_DEBUG) SERIAL_DEBUG->printf("MicroBitValueService::valueUpdate\r\n");
00098 #endif
00099 
00100     if (ble.getGapState().connected)
00101     {
00102         valueCharacteristicBuffer = *value;
00103         ble.gattServer().write(valueCharacteristicHandle, (const uint8_t *)&valueCharacteristicBuffer, sizeof(valueCharacteristicBuffer));
00104     }
00105 
00106 }
00107 
00108 const uint8_t  MicroBitValueServiceUUID[] = {
00109     0xab,0x05,0xf2,0xd8,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
00110 };
00111 
00112 const uint8_t  MicroBitValueServiceDataUUID[] = {
00113     0xab,0x05,0xfb,0x11,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
00114 };
00115 
00116 const uint8_t  MicroBitValueServicePeriodUUID[] = {
00117     0xab,0x05,0x38,0x6c,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
00118 };
00119 
00120 const uint8_t  MicroBitValueServiceBearingUUID[] = {
00121     0xab,0x05,0x97,0x15,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
00122 };