Diff: HeartRateService.h

Revision:

39:6390604f904c

Child:

41:9cef0129da5f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HeartRateService.h	Fri Aug 22 14:55:52 2014 +0000
@@ -0,0 +1,97 @@
+/* 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"
+
+/* Heart Rate Service */
+/* Service:  https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.heart_rate.xml */
+/* HRM Char: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml */
+/* Location: https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.body_sensor_location.xml */
+class HeartRateService {
+public:
+    static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_OTHER    = 0;
+    static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_CHEST    = 1;
+    static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_WRIST    = 2;
+    static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_FINGER   = 3;
+    static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_HAND     = 4;
+    static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_EAR_LOBE = 5;
+    static const unsigned BLE_HRS_BODY_SENSOR_LOCATION_FOOT     = 6;
+
+public:
+    HeartRateService(BLEDevice &_ble, uint8_t _hrmCounter, uint8_t _location) :
+        ble(_ble),
+        bpm(_hrmCounter),
+        hrmRate(GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR, bpm.getPointer(), HeartRateValueBytes::SIZEOF_ARRAY, HeartRateValueBytes::SIZEOF_ARRAY,
+                GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY),
+        hrmLocation(GattCharacteristic::UUID_BODY_SENSOR_LOCATION_CHAR, (uint8_t *)&_location, sizeof(_location), sizeof(_location),
+                    GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ) {
+
+        static bool serviceAdded = false; /* We should only ever need to add the heart rate service once. */
+        if (serviceAdded) {
+            return;
+        }
+
+        GattCharacteristic *hrmChars[] = {&hrmRate, &hrmLocation, };
+        GattService         hrmService(GattService::UUID_HEART_RATE_SERVICE, hrmChars, sizeof(hrmChars) / sizeof(GattCharacteristic *));
+
+        ble.addService(hrmService);
+        serviceAdded = true;
+    }
+
+    void updateHeartRate(uint8_t hrmCounter) {
+        if (ble.getGapState().connected) {
+            bpm.updateHeartRate(hrmCounter);
+            ble.updateCharacteristicValue(hrmRate.getHandle(), bpm.getPointer(), HeartRateValueBytes::SIZEOF_ARRAY);
+        }
+    }
+
+private:
+    /* Private internal representation for the bytes used to work with the vaulue of the heart-rate characteristic. */
+    struct HeartRateValueBytes {
+        static const unsigned SIZEOF_ARRAY = 2;
+
+        HeartRateValueBytes(uint8_t hrmCounter) : beatsPerMinute() {
+            updateHeartRate(hrmCounter);
+        }
+
+        void updateHeartRate(uint8_t hrmCounter) {
+            beatsPerMinute[1] = hrmCounter;
+        }
+
+        uint8_t *getPointer(void) {
+            return beatsPerMinute;
+        }
+
+        const uint8_t *getPointer(void) const {
+            return beatsPerMinute;
+        }
+
+        /* 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 beatsPerMinute[SIZEOF_ARRAY];
+    };
+
+private:
+    BLEDevice           &ble;
+    HeartRateValueBytes  bpm;
+    GattCharacteristic   hrmRate;
+    GattCharacteristic   hrmLocation;
+};
+
+#endif /* #ifndef __BLE_HEART_RATE_SERVICE_H__*/