Revision 1:94152e7d8b5c, committed 2015-02-14

Comitter:

mbedAustin

Date:

Sat Feb 14 06:49:01 2015 +0000

Parent:

0:cd5b6733aeb1

Child:

2:e84c13abc479

Commit message:

added a little more skeleton to it, still needs to be fully flushed out, tossed the HeartRate service code into the custom service.h file, added link to Grove Colour Sensor example for inspiration for later

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CustomService.h	Sat Feb 14 06:49:01 2015 +0000
@@ -0,0 +1,202 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+#ifndef __BLE_HEART_RATE_SERVICE_H__
+#define __BLE_HEART_RATE_SERVICE_H__
+ 
+#include "BLEDevice.h"
+ 
+/**
+* @class HeartRateService
+* @brief BLE Service for HeartRate. This BLE Service contains the location of the sensor, the heartrate in beats per minute. <br>
+* Service:  https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml <br>
+* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml <br>
+* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml
+*/
+class HeartRateService {
+public:
+    /**
+    * @enum SensorLocation
+    * @brief Location of HeartRate sensor on body.
+    */
+    enum {
+        LOCATION_OTHER = 0, /*!< Other Location */
+        LOCATION_CHEST,     /*!< Chest */
+        LOCATION_WRIST,     /*!< Wrist */
+        LOCATION_FINGER,    /*!< Finger */
+        LOCATION_HAND,      /*!< Hand */
+        LOCATION_EAR_LOBE,  /*!< Earlobe */
+        LOCATION_FOOT,      /*!< Foot */
+    };
+ 
+public:
+    /**
+     * @brief Constructor with 8bit HRM Counter value.
+     *
+     * @param[ref] _ble
+     *               Reference to the underlying BLEDevice.
+     * @param[in] hrmCounter (8-bit)
+     *               initial value for the hrm counter.
+     * @param[in] location
+     *               Sensor's location.
+     */
+    HeartRateService(BLEDevice &_ble, uint8_t hrmCounter, uint8_t location) :
+        ble(_ble),
+        valueBytes(hrmCounter),
+        hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, valueBytes.getPointer(),
+                valueBytes.getNumValueBytes(), HeartRateValueBytes::MAX_VALUE_BYTES,
+                GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
+        hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, &location),
+        controlPoint(GattCharacteristic::UUID_HEART_RATE_CONTROL_POINT_CHAR, &controlPointValue) {
+        setupService();
+    }
+ 
+    /**
+     * @brief Constructor with a 16-bit HRM Counter value.
+     *
+     * @param[in] _ble
+     *               Reference to the underlying BLEDevice.
+     * @param[in] hrmCounter (8-bit)
+     *               initial value for the hrm counter.
+     * @param[in] location
+     *               Sensor's location.
+     */
+    HeartRateService(BLEDevice &_ble, uint16_t hrmCounter, uint8_t location) :
+        ble(_ble),
+        valueBytes(hrmCounter),
+        hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, valueBytes.getPointer(),
+                valueBytes.getNumValueBytes(), HeartRateValueBytes::MAX_VALUE_BYTES,
+                GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
+        hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, &location),
+        controlPoint(GattCharacteristic::UUID_HEART_RATE_CONTROL_POINT_CHAR, &controlPointValue) {
+        setupService();
+    }
+ 
+    /**
+     * @brief Set a new 8-bit value for heart rate.
+     *
+     * @param[in] hrmCounter
+     *                  HeartRate in bpm.
+     */
+    void updateHeartRate(uint8_t hrmCounter) {
+        valueBytes.updateHeartRate(hrmCounter);
+        ble.updateCharacteristicValue(hrmRate.getValueAttribute().getHandle(), valueBytes.getPointer(), valueBytes.getNumValueBytes());
+    }
+ 
+    /**
+     * Set a new 16-bit value for heart rate.
+     *
+     * @param[in] hrmCounter
+     *                  HeartRate in bpm.
+     */
+    void updateHeartRate(uint16_t hrmCounter) {
+        valueBytes.updateHeartRate(hrmCounter);
+        ble.updateCharacteristicValue(hrmRate.getValueAttribute().getHandle(), valueBytes.getPointer(), valueBytes.getNumValueBytes());
+    }
+ 
+    /**
+     * This callback allows the HeartRateService to receive updates to the
+     * controlPoint Characteristic.
+     *
+     * @param[in] params
+     *     Information about the characterisitc being updated.
+     */
+    virtual void onDataWritten(const GattCharacteristicWriteCBParams *params) {
+        if (params->charHandle == controlPoint.getValueAttribute().getHandle()) {
+            /* Do something here if the new value is 1; else you can override this method by
+             * extending this class.
+             * @NOTE: if you are extending this class, be sure to also call
+             * ble.onDataWritten(this, &ExtendedHRService::onDataWritten); in
+             * your constructor.
+             */
+        }
+    }
+ 
+private:
+    void setupService(void) {
+        static bool serviceAdded = false; /* We should only ever need to add the heart rate service once. */
+        if (serviceAdded) {
+            return;
+        }
+ 
+        GattCharacteristic *charTable[] = {&hrmRate, &hrmLocation, &controlPoint};
+        GattService         hrmService(GattService::UUID_HEART_RATE_SERVICE, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
+ 
+        ble.addService(hrmService);
+        serviceAdded = true;
+ 
+        ble.onDataWritten(this, &HeartRateService::onDataWritten);
+    }
+ 
+private:
+    /* Private internal representation for the bytes used to work with the vaulue of the heart-rate characteristic. */
+    struct HeartRateValueBytes {
+        static const unsigned MAX_VALUE_BYTES  = 3; /* FLAGS + up to two bytes for heart-rate */
+        static const unsigned FLAGS_BYTE_INDEX = 0;
+ 
+        static const unsigned VALUE_FORMAT_BITNUM = 0;
+        static const uint8_t  VALUE_FORMAT_FLAG   = (1 << VALUE_FORMAT_BITNUM);
+ 
+        HeartRateValueBytes(uint8_t hrmCounter) : valueBytes() {
+            updateHeartRate(hrmCounter);
+        }
+ 
+        HeartRateValueBytes(uint16_t hrmCounter) : valueBytes() {
+            updateHeartRate(hrmCounter);
+        }
+ 
+        void updateHeartRate(uint8_t hrmCounter) {
+            valueBytes[FLAGS_BYTE_INDEX]    &= ~VALUE_FORMAT_FLAG;
+            valueBytes[FLAGS_BYTE_INDEX + 1] = hrmCounter;
+        }
+ 
+        void updateHeartRate(uint16_t hrmCounter) {
+            valueBytes[FLAGS_BYTE_INDEX]    |= VALUE_FORMAT_FLAG;
+            valueBytes[FLAGS_BYTE_INDEX + 1] = (uint8_t)(hrmCounter & 0xFF);
+            valueBytes[FLAGS_BYTE_INDEX + 2] = (uint8_t)(hrmCounter >> 8);
+        }
+ 
+        uint8_t       *getPointer(void) {
+            return valueBytes;
+        }
+ 
+        const uint8_t *getPointer(void) const {
+            return valueBytes;
+        }
+ 
+        unsigned       getNumValueBytes(void) const {
+            return 1 + ((valueBytes[FLAGS_BYTE_INDEX] & VALUE_FORMAT_FLAG) ? sizeof(uint16_t) : sizeof(uint8_t));
+        }
+ 
+private:
+        /* First byte = 8-bit values, no extra info, Second byte = uint8_t HRM value */
+        /* See --> https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
+        uint8_t valueBytes[MAX_VALUE_BYTES];
+    };
+ 
+private:
+    BLEDevice           &ble;
+ 
+    HeartRateValueBytes  valueBytes;
+    uint8_t              controlPointValue;
+ 
+    GattCharacteristic                   hrmRate;
+    ReadOnlyGattCharacteristic<uint8_t>  hrmLocation;
+    WriteOnlyGattCharacteristic<uint8_t> controlPoint;
+};
+ 
+#endif /* #ifndef __BLE_HEART_RATE_SERVICE_H__*/
+            

--- a/main.cpp	Fri Feb 13 21:02:25 2015 +0000
+++ b/main.cpp	Sat Feb 14 06:49:01 2015 +0000
@@ -1,10 +1,31 @@
 #include "mbed.h"
 #include "BLEDevice.h"
+#include "CustomService.h"
+
+
+// BLE object
+BLEDevice ble;
+
+// LED object
+DigitalOut led(LED1);
+
+const static char     DEVICE_NAME[]        = "MyDeviceName"; // change this
+static const uint16_t uuid16_list[]        = {0xFF}; //Custom UUID, FF is reserved for development
+
+// Restart advertising when phone app disconnects
+void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)
+{
+    ble.startAdvertising(); // restart advertising
+}
 
 
 int
 main(void)
 {
-    printf("This is an example program...");
-    while(1){}
+    led = 0;    // turn LED off
+    ble.init(); // initialize BLE
+    
+    // TODO: impliment the rest of triggering for LED based on Write of characteristic.
+    // TODO: impliment a read characteristic that sends text back to app
+    // take a look at http://developer.mbed.org/teams/Bluetooth-Low-Energy/code/BLE_GroveColourSensor/file/000c8f8c7f03/main.cpp for inspiration.
 }
\ No newline at end of file