Diff: source/bluetooth/MicroBitTemperatureService.cpp

Revision:

1:8aa5cdb4ab67

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/bluetooth/MicroBitTemperatureService.cpp	Thu Apr 07 01:33:22 2016 +0100
@@ -0,0 +1,115 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2016 British Broadcasting Corporation.
+This software is provided by Lancaster University by arrangement with the BBC.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+/**
+  * Class definition for the custom MicroBit Temperature Service.
+  * Provides a BLE service to remotely read the silicon temperature of the nRF51822.
+  */
+#include "MicroBitConfig.h"
+#include "ble/UUID.h"
+
+#include "MicroBitTemperatureService.h"
+
+/**
+  * Constructor.
+  * Create a representation of the TemperatureService
+  * @param _ble The instance of a BLE device that we're running on.
+  * @param _thermometer An instance of MicroBitThermometer to use as our temperature source.
+  */
+MicroBitTemperatureService::MicroBitTemperatureService(BLEDevice &_ble, MicroBitThermometer &_thermometer) :
+        ble(_ble), thermometer(_thermometer)
+{
+    // Create the data structures that represent each of our characteristics in Soft Device.
+    GattCharacteristic  temperatureDataCharacteristic(MicroBitTemperatureServiceDataUUID, (uint8_t *)&temperatureDataCharacteristicBuffer, 0,
+    sizeof(temperatureDataCharacteristicBuffer), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
+
+    GattCharacteristic  temperaturePeriodCharacteristic(MicroBitTemperatureServicePeriodUUID, (uint8_t *)&temperaturePeriodCharacteristicBuffer, 0,
+    sizeof(temperaturePeriodCharacteristicBuffer), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE);
+
+    // Initialise our characteristic values.
+    temperatureDataCharacteristicBuffer = 0;
+    temperaturePeriodCharacteristicBuffer = thermometer.getPeriod();
+
+    // Set default security requirements
+    temperatureDataCharacteristic.requireSecurity(SecurityManager::MICROBIT_BLE_SECURITY_LEVEL);
+    temperaturePeriodCharacteristic.requireSecurity(SecurityManager::MICROBIT_BLE_SECURITY_LEVEL);
+
+    GattCharacteristic *characteristics[] = {&temperatureDataCharacteristic, &temperaturePeriodCharacteristic};
+    GattService         service(MicroBitTemperatureServiceUUID, characteristics, sizeof(characteristics) / sizeof(GattCharacteristic *));
+
+    ble.addService(service);
+
+    temperatureDataCharacteristicHandle = temperatureDataCharacteristic.getValueHandle();
+    temperaturePeriodCharacteristicHandle = temperaturePeriodCharacteristic.getValueHandle();
+
+    ble.gattServer().write(temperatureDataCharacteristicHandle,(uint8_t *)&temperatureDataCharacteristicBuffer, sizeof(temperatureDataCharacteristicBuffer));
+    ble.gattServer().write(temperaturePeriodCharacteristicHandle,(uint8_t *)&temperaturePeriodCharacteristicBuffer, sizeof(temperaturePeriodCharacteristicBuffer));
+
+    ble.onDataWritten(this, &MicroBitTemperatureService::onDataWritten);
+    if (EventModel::defaultEventBus)
+        EventModel::defaultEventBus->listen(MICROBIT_ID_THERMOMETER, MICROBIT_THERMOMETER_EVT_UPDATE, this, &MicroBitTemperatureService::temperatureUpdate, MESSAGE_BUS_LISTENER_IMMEDIATE);
+}
+
+/**
+  * Temperature update callback
+  */
+void MicroBitTemperatureService::temperatureUpdate(MicroBitEvent)
+{
+    if (ble.getGapState().connected)
+    {
+        temperatureDataCharacteristicBuffer = thermometer.getTemperature();
+        ble.gattServer().notify(temperatureDataCharacteristicHandle,(uint8_t *)&temperatureDataCharacteristicBuffer, sizeof(temperatureDataCharacteristicBuffer));
+    }
+}
+
+/**
+  * Callback. Invoked when any of our attributes are written via BLE.
+  */
+void MicroBitTemperatureService::onDataWritten(const GattWriteCallbackParams *params)
+{
+    if (params->handle == temperaturePeriodCharacteristicHandle && params->len >= sizeof(temperaturePeriodCharacteristicBuffer))
+    {
+        temperaturePeriodCharacteristicBuffer = *((uint16_t *)params->data);
+        thermometer.setPeriod(temperaturePeriodCharacteristicBuffer);
+
+        // The accelerometer will choose the nearest period to that requested that it can support
+        // Read back the ACTUAL period it is using, and report this back.
+        temperaturePeriodCharacteristicBuffer = thermometer.getPeriod();
+        ble.gattServer().write(temperaturePeriodCharacteristicHandle, (const uint8_t *)&temperaturePeriodCharacteristicBuffer, sizeof(temperaturePeriodCharacteristicBuffer));
+    }
+}
+
+
+const uint8_t  MicroBitTemperatureServiceUUID[] = {
+    0xe9,0x5d,0x61,0x00,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};
+
+const uint8_t  MicroBitTemperatureServiceDataUUID[] = {
+    0xe9,0x5d,0x92,0x50,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};
+
+const uint8_t  MicroBitTemperatureServicePeriodUUID[] = {
+    0xe9,0x5d,0x1b,0x25,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};