
Simple example to demonstrate custom made BLE service and characteristics.
Fork of BLE_GATT_Example by
Revision 12:6d1f77d0cb37, committed 2015-03-17
- Comitter:
- mbedAustin
- Date:
- Tue Mar 17 20:38:40 2015 +0000
- Parent:
- 11:b59226338001
- Child:
- 13:62b1d32745ac
- Commit message:
- switched out characteristics with macros initializations and removed customservice.h;
Changed in this revision
CustomService.h | Show diff for this revision Revisions of this file |
main.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- a/CustomService.h Wed Mar 11 14:23:25 2015 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,202 +0,0 @@ -/* 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 Wed Mar 11 14:23:25 2015 +0000 +++ b/main.cpp Tue Mar 17 20:38:40 2015 +0000 @@ -1,11 +1,10 @@ #include "mbed.h" #include "BLEDevice.h" -#include "CustomService.h" BLEDevice ble; DigitalOut led(LED1); uint16_t customServiceUUID = 0xA000; -uint16_t reachCharUUID = 0xA001; +uint16_t readCharUUID = 0xA001; uint16_t writeCharUUID = 0xA002; const static char DEVICE_NAME[] = "ChangeMe!!"; // change this @@ -13,12 +12,10 @@ // Set Up custom Characteristics static uint8_t readValue[10] = {0}; -GattCharacteristic readChar(reachCharUUID, readValue, sizeof(readValue), sizeof(readValue), - GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY); +ReadOnlyArrayGattCharacteristic<uint8_t, sizeof(readValue)> readChar(readCharUUID, readValue); static uint8_t writeValue[10] = {0}; -GattCharacteristic writeChar(writeCharUUID, writeValue, sizeof(writeValue), sizeof(writeValue), - GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY); +WriteOnlyArrayGattCharacteristic<uint8_t, sizeof(writeValue)> writeChar(writeCharUUID, writeValue); // Set up custom service GattCharacteristic *characteristics[] = {&readChar, &writeChar};