Revision 74:06ddfe5ccbea, committed 2022-11-04

Comitter:

leejinRMX

Date:

Fri Nov 04 18:30:19 2022 +0000

Parent:

73:eb91bba49623

Commit message:

add blutooth service

Changed in this revision

diff -r eb91bba49623 -r 06ddfe5ccbea inc/bluetooth/MicroBitBLEManager.h
--- a/inc/bluetooth/MicroBitBLEManager.h	Wed Jul 13 14:32:54 2016 +0000
+++ b/inc/bluetooth/MicroBitBLEManager.h	Fri Nov 04 18:30:19 2022 +0000
@@ -52,6 +52,7 @@
 #include "MicroBitDFUService.h"
 #include "MicroBitEventService.h"
 #include "MicroBitLEDService.h"
+#include "MicroBitValueService.h"
 #include "MicroBitAccelerometerService.h"
 #include "MicroBitMagnetometerService.h"
 #include "MicroBitButtonService.h"

diff -r eb91bba49623 -r 06ddfe5ccbea inc/bluetooth/MicroBitValueService.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/inc/bluetooth/MicroBitValueService.h	Fri Nov 04 18:30:19 2022 +0000
@@ -0,0 +1,81 @@
+/*
+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.
+*/
+
+#ifndef MICROBIT_VALUE_SERVICE_H
+#define MICROBIT_VALUE_SERVICE_H
+
+#include "ble/BLE.h"
+#include "MicroBitConfig.h"
+#include "EventModel.h"
+
+#define MICROBIT_VALUE_EVT_UPDATE 1
+
+// UUIDs for our service and characteristics
+extern const uint8_t  MicroBitValueServiceUUID[];
+extern const uint8_t  MicroBitValueServiceDataUUID[];
+extern const uint8_t  MicroBitValueServiceBearingUUID[];
+extern const uint8_t  MicroBitValueServicePeriodUUID[];
+
+
+/**
+  * Class definition for the MicroBit BLE Value Service.
+  * Provides access to live data via BLE, and provides basic configuration options.
+  */
+class MicroBitValueService
+{
+    public:
+
+    /**
+      * Constructor.
+      * Create a representation of the MagnetometerService.
+      * @param _ble The instance of a BLE device that we're running on.
+      * @param _value An instance of MicroBitCompass to use as our Magnetometer source.
+      */
+    MicroBitValueService(BLEDevice &_ble, uint16_t *_value);
+
+    private:
+
+    /**
+      * Callback. Invoked when any of our attributes are written via BLE.
+      */
+    void onDataWritten(const GattWriteCallbackParams *params);
+
+    /**
+     * Value update callback
+     */
+    void valueUpdate(MicroBitEvent e);
+
+    // Bluetooth stack we're running on.
+    BLEDevice           &ble;
+    uint16_t            *value;
+
+    // memory for our 8 bit control characteristics.
+    uint16_t            valueCharacteristicBuffer;
+
+    // Handles to access each characteristic when they are held by Soft Device.
+    GattAttribute::Handle_t valueCharacteristicHandle;
+};
+
+#endif

diff -r eb91bba49623 -r 06ddfe5ccbea inc/core/MicroBitComponent.h
--- a/inc/core/MicroBitComponent.h	Wed Jul 13 14:32:54 2016 +0000
+++ b/inc/core/MicroBitComponent.h	Fri Nov 04 18:30:19 2022 +0000
@@ -68,6 +68,8 @@
 #define MICROBIT_ID_MULTIBUTTON_ATTACH  31
 #define MICROBIT_ID_SERIAL              32
 
+#define MICROBIT_ID_VALUE               40
+
 #define MICROBIT_ID_MESSAGE_BUS_LISTENER            1021          // Message bus indication that a handler for a given ID has been registered.
 #define MICROBIT_ID_NOTIFY_ONE                      1022          // Notfication channel, for general purpose synchronisation
 #define MICROBIT_ID_NOTIFY                          1023          // Notfication channel, for general purpose synchronisation

diff -r eb91bba49623 -r 06ddfe5ccbea inc/core/MicroBitConfig.h
--- a/inc/core/MicroBitConfig.h	Wed Jul 13 14:32:54 2016 +0000
+++ b/inc/core/MicroBitConfig.h	Fri Nov 04 18:30:19 2022 +0000
@@ -101,7 +101,7 @@
 // For standard S110 builds, this should be word aligned and in the range 0x300 - 0x700.
 // Any unused memory will be automatically reclaimed as HEAP memory if both MICROBIT_HEAP_REUSE_SD and MICROBIT_HEAP_ALLOCATOR are enabled.
 #ifndef MICROBIT_SD_GATT_TABLE_SIZE
-#define MICROBIT_SD_GATT_TABLE_SIZE             0x300
+#define MICROBIT_SD_GATT_TABLE_SIZE             0x500
 #endif
 
 //
@@ -187,7 +187,7 @@
 // Open BLE links are not secure, but commonly used during the development of BLE services
 // Set '1' to disable all secuity
 #ifndef MICROBIT_BLE_OPEN
-#define MICROBIT_BLE_OPEN                       0
+#define MICROBIT_BLE_OPEN                       1
 #endif
 
 // Configure for open BLE operation if so configured
@@ -350,7 +350,7 @@
 // n.b. This also disables the user serial port 'uBit.serial'.
 // Set '1' to enable.
 #ifndef MICROBIT_DBG
-#define MICROBIT_DBG                            0
+#define MICROBIT_DBG                            1
 #endif
 
 // Enable this to receive diagnostic messages from the heap allocator via the USB serial interface.

diff -r eb91bba49623 -r 06ddfe5ccbea inc/drivers/MicroBitValue.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/inc/drivers/MicroBitValue.h	Fri Nov 04 18:30:19 2022 +0000
@@ -0,0 +1,165 @@
+/*
+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.
+*/
+
+#ifndef MICROBIT_VALUE_H
+#define MICROBIT_VALUE_H
+
+#include "mbed.h"
+#include "MicroBitConfig.h"
+#include "MicroBitComponent.h"
+#include "MicroBitStorage.h"
+
+/**
+  * Value events
+  */
+#define MICROBIT_VALUE_EVT_DATA_UPDATE          1
+
+struct ValueSample
+{
+    int     v;
+
+    ValueSample()
+    {
+        this->v = 0;
+    }
+
+    ValueSample(int v)
+    {
+        this->v = v;
+    }
+
+    bool operator==(const ValueSample& other) const
+    {
+        return v == other.v;
+    }
+
+    bool operator!=(const ValueSample& other) const
+    {
+        return !(v == other.v);
+    }
+};
+
+/**
+  * Class definition for MicroBit Value.
+  *
+  * Represents an implementation of shared value.
+  * Also includes basic caching.
+  */
+class MicroBitValue : public MicroBitComponent
+{
+
+    ValueSample             sample;                   // The latest sample data recorded.
+    MicroBitStorage*        storage;                  // An instance of MicroBitStorage used for persistence.
+
+    public:
+
+    /**
+      * Constructor.
+      * Create a software representation of an e-value.
+      *
+      *
+      * @param _storage an instance of MicroBitStorage, used to persist calibration data across resets.
+      *
+      * @param id the ID of the new MicroBitCompass object. Defaults to MICROBIT_ID_VALUE.
+      *
+      * @code
+      *
+      * MicroBitStorage storage;
+      *
+      * MicroBitValue uBitValue(storage);
+      * @endcode
+      */
+    MicroBitValue(MicroBitStorage& _storage, uint16_t id = MICROBIT_ID_VALUE);
+
+    /**
+      * Constructor.
+      * Create a software representation of an e-value.
+      *
+      * @param id the ID of the new MicroBitCompass object. Defaults to MICROBIT_ID_VALUE.
+      *
+      * @code
+      * MicroBitI2C i2c(I2C_SDA0, I2C_SCL0);
+      *
+      * MicroBitCompass compass(i2c);
+      * @endcode
+      */
+    MicroBitValue(uint16_t id = MICROBIT_ID_VALUE);
+
+    /**
+      * Reads the value of the V integer.
+      *
+      * @return The value V.
+      *
+      * @code
+      * value.getV();
+      * @endcode
+      */
+    int getV();
+
+    /**
+      * Set the value of the V integer.
+      *
+      * @param The value V.
+      *
+      * @code
+      * value.setV(v);
+      * @endcode
+      */
+    void setV(int v);
+
+    /**
+      * Updates the local sample, only if the compass indicates that
+      * data is stale.
+      *
+      * @note Can be used to trigger manual updates, if the device is running without a scheduler.
+      *       Also called internally by getV() member functions.
+      */
+    int updateSample();
+
+    /**
+      * Periodic callback from MicroBit idle thread.
+      *
+      * Calls updateSample().
+      */
+    virtual void idleTick();
+
+
+    /**
+      * Destructor for MicroBitCompass, where we deregister this instance from the array of fiber components.
+      */
+    ~MicroBitValue();
+
+    private:
+
+    /**
+      * An initialisation member function used by the many constructors of MicroBitValue.
+      *
+      * @param id the unique identifier for this value instance.
+      *
+      */
+    void init(uint16_t id);
+};
+
+#endif
\ No newline at end of file

diff -r eb91bba49623 -r 06ddfe5ccbea source/CMakeLists.txt
--- a/source/CMakeLists.txt	Wed Jul 13 14:32:54 2016 +0000
+++ b/source/CMakeLists.txt	Fri Nov 04 18:30:19 2022 +0000
@@ -52,6 +52,7 @@
     "bluetooth/MicroBitMagnetometerService.cpp"
     "bluetooth/MicroBitTemperatureService.cpp"
     "bluetooth/MicroBitUARTService.cpp"
+    "bluetooth/MicroBitValueService.cpp"
 )
 
 execute_process(WORKING_DIRECTORY "../../yotta_modules/${PROJECT_NAME}" COMMAND "git" "log" "--pretty=format:%h" "-n" "1" OUTPUT_VARIABLE git_hash)

diff -r eb91bba49623 -r 06ddfe5ccbea source/bluetooth/MicroBitValueService.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/bluetooth/MicroBitValueService.cpp	Fri Nov 04 18:30:19 2022 +0000
@@ -0,0 +1,122 @@
+/*
+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 MicroBit BLE Magnetometer Service.
+  * Provides access to live magnetometer data via BLE, and provides basic configuration options.
+  */
+#include "MicroBitConfig.h"
+#include "ble/UUID.h"
+
+#include "MicroBitValueService.h"
+
+/**
+  * Constructor.
+  * Create a representation of the MagnetometerService.
+  * @param _ble The instance of a BLE device that we're running on.
+  * @param _compass An instance of MicroBitCompass to use as our Magnetometer source.
+  */
+MicroBitValueService::MicroBitValueService(BLEDevice &_ble, uint16_t *_value) :
+        ble(_ble), value(_value)
+{
+#if CONFIG_ENABLED(MICROBIT_DBG)
+    if(SERIAL_DEBUG) SERIAL_DEBUG->printf("MicroBitValueService::MicroBitValueService value = %i\r\n", *value);
+#endif
+    // Create the data structures that represent each of our characteristics in Soft Device.
+
+    GattCharacteristic  valueCharacteristic(MicroBitValueServiceDataUUID, (uint8_t *)&valueCharacteristicBuffer, 0,
+    sizeof(valueCharacteristicBuffer),
+    GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE);
+
+    // Initialise our characteristic values.
+    valueCharacteristicBuffer = *value;
+
+    // Set default security requirements
+    valueCharacteristic.requireSecurity(SecurityManager::MICROBIT_BLE_SECURITY_LEVEL);
+
+    GattCharacteristic *characteristics[] = {&valueCharacteristic};
+    GattService         service(MicroBitValueServiceUUID, characteristics, sizeof(characteristics) / sizeof(GattCharacteristic *));
+
+    ble.addService(service);
+
+    valueCharacteristicHandle = valueCharacteristic.getValueHandle();
+
+    ble.gattServer().write(valueCharacteristicHandle, (const uint8_t *)&valueCharacteristicBuffer, sizeof(valueCharacteristicBuffer));
+
+    ble.gattServer().onDataWritten(this, &MicroBitValueService::onDataWritten);
+
+    if (EventModel::defaultEventBus)
+    {
+        EventModel::defaultEventBus->listen(MICROBIT_ID_VALUE, MICROBIT_VALUE_EVT_UPDATE, this, &MicroBitValueService::valueUpdate, MESSAGE_BUS_LISTENER_IMMEDIATE);
+    }
+}
+
+/**
+  * Callback. Invoked when any of our attributes are written via BLE.
+  */
+void MicroBitValueService::onDataWritten(const GattWriteCallbackParams *params)
+{
+
+    if (params->handle == valueCharacteristicHandle && params->len >= sizeof(valueCharacteristicBuffer))
+    {
+        valueCharacteristicBuffer = *((uint16_t *)params->data);
+        *value = valueCharacteristicBuffer;
+        //MicroBitEvent e(41, MICROBIT_VALUE_EVT_UPDATE);
+    }
+}
+
+/**
+  * Magnetometer update callback
+  */
+void MicroBitValueService::valueUpdate(MicroBitEvent)
+{
+    
+#if CONFIG_ENABLED(MICROBIT_DBG)
+    if(SERIAL_DEBUG) SERIAL_DEBUG->printf("MicroBitValueService::valueUpdate\r\n");
+#endif
+
+    if (ble.getGapState().connected)
+    {
+        valueCharacteristicBuffer = *value;
+        ble.gattServer().write(valueCharacteristicHandle, (const uint8_t *)&valueCharacteristicBuffer, sizeof(valueCharacteristicBuffer));
+    }
+
+}
+
+const uint8_t  MicroBitValueServiceUUID[] = {
+    0xab,0x05,0xf2,0xd8,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};
+
+const uint8_t  MicroBitValueServiceDataUUID[] = {
+    0xab,0x05,0xfb,0x11,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};
+
+const uint8_t  MicroBitValueServicePeriodUUID[] = {
+    0xab,0x05,0x38,0x6c,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};
+
+const uint8_t  MicroBitValueServiceBearingUUID[] = {
+    0xab,0x05,0x97,0x15,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};
\ No newline at end of file

diff -r eb91bba49623 -r 06ddfe5ccbea source/drivers/MicroBitValue.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/drivers/MicroBitValue.cpp	Fri Nov 04 18:30:19 2022 +0000
@@ -0,0 +1,188 @@
+/*
+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 MicroBit Value.
+  *
+  * Represents an implementation of the Freescale MAG3110 I2C Magnetmometer.
+  * Also includes basic caching.
+  */
+#include "MicroBitConfig.h"
+#include "MicroBitValue.h"
+#include "MicroBitFiber.h"
+#include "ErrorNo.h"
+
+/**
+  * An initialisation member function used by the many constructors of MicroBitValue.
+  *
+  * @param id the unique identifier for this value instance.
+  *
+  */
+void MicroBitValue::init(uint16_t id)
+{
+    this->id = id;
+
+    if(this->storage != NULL)
+    {
+        /*
+        KeyValuePair *calibrationData =  storage->get("compassCal");
+
+        if(calibrationData != NULL)
+        {
+            CompassSample storedSample = CompassSample();
+
+            memcpy(&storedSample, calibrationData->value, sizeof(CompassSample));
+
+            setCalibration(storedSample);
+
+            delete calibrationData;
+        }
+        */
+    }
+
+    // Indicate that we're up and running.
+    status |= MICROBIT_COMPONENT_RUNNING;
+}
+
+
+
+/**
+  * Constructor.
+  * Create a software representation of an e-compass.
+  *
+  * @param _i2c an instance of i2c, which the compass is accessible from.
+  *
+  * @param _storage an instance of MicroBitStorage, used to persist calibration data across resets.
+  *
+  * @param address the default address for the compass register on the i2c bus. Defaults to MAG3110_DEFAULT_ADDR.
+  *
+  * @param id the ID of the new MicroBitCompass object. Defaults to MAG3110_DEFAULT_ADDR.
+  *
+  * @code
+  * MicroBitI2C i2c(I2C_SDA0, I2C_SCL0);
+  *
+  * MicroBitStorage storage;
+  *
+  * MicroBitCompass compass(i2c, storage);
+  * @endcode
+  */
+MicroBitValue::MicroBitValue(MicroBitStorage& _storage, uint16_t id) :
+    sample(),
+    storage(&_storage)
+{
+    init(id);
+}
+
+/**
+  * Constructor.
+  * Create a software representation of an e-compass.
+  *
+  * @param _i2c an instance of i2c, which the compass is accessible from.
+  *
+  * @param address the default address for the compass register on the i2c bus. Defaults to MAG3110_DEFAULT_ADDR.
+  *
+  * @param id the ID of the new MicroBitCompass object. Defaults to MAG3110_DEFAULT_ADDR.
+  *
+  * @code
+  * MicroBitI2C i2c(I2C_SDA0, I2C_SCL0);
+  *
+  * MicroBitCompass compass(i2c);
+  * @endcode
+  */
+MicroBitValue::MicroBitValue(uint16_t id) :
+    sample(),
+    storage(NULL)
+{
+    init(id);
+}
+
+/**
+  * Updates the local sample, only if the compass indicates that
+  * data is stale.
+  *
+  * @note Can be used to trigger manual updates, if the device is running without a scheduler.
+  *       Also called internally by all get[X,Y,Z]() member functions.
+  */
+int MicroBitValue::updateSample()
+{
+    /**
+      * Adds the compass to idle, if it hasn't been added already.
+      * This is an optimisation so that the compass is only added on first 'use'.
+      */
+    if(!(status & 0x01))
+    {
+        fiber_add_idle_component(this);
+        status |= 0x01;
+    }
+
+    return MICROBIT_OK;
+}
+
+/**
+  * Periodic callback from MicroBit idle thread.
+  *
+  * Calls updateSample().
+  */
+void MicroBitValue::idleTick()
+{
+    updateSample();
+}
+
+/**
+  * Attempts to set the sample rate of the compass to the specified value (in ms).
+  *
+  * @param period the requested time between samples, in milliseconds.
+  *
+  * @return MICROBIT_OK or MICROBIT_I2C_ERROR if the magnetometer could not be updated.
+  *
+  * @code
+  * // sample rate is now 20 ms.
+  * compass.setPeriod(20);
+  * @endcode
+  *
+  * @note The requested rate may not be possible on the hardware. In this case, the
+  * nearest lower rate is chosen.
+  */
+void MicroBitValue::setV(int v)
+{
+    this->sample.v = v;
+}
+
+/**
+  * Reads the currently configured sample rate of the compass.
+  *
+  * @return The time between samples, in milliseconds.
+  */
+int MicroBitValue::getV()
+{
+    return (int)sample.v;
+}
+/**
+  * Destructor for MicroBitCompass, where we deregister this instance from the array of fiber components.
+  */
+MicroBitValue::~MicroBitValue()
+{
+    fiber_remove_idle_component(this);
+}