Marco Ferreira / BLE_API

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Fork of BLE_API by Bluetooth Low Energy

ble/GattAttribute.h@996:14aeadec4695, 2015-12-02 (annotated)

Committer:
rgrover1
Date:
Wed Dec 02 10:29:44 2015 +0000
Revision:
996:14aeadec4695
Parent:
993:4d62b7967c11
Child:
1006:76ae9bbf173f
Synchronized with git rev db1ff945

Author: Andres Amaya Garcia

Separate the concept of minlen and len in GattChar



In previous versions of BLE_API the GattCharacteristic initLen parameter is

named minLen as well. When the characteristic is committed to the SoftDevice

the value of initial length is also used as the minimum length of the

characteristic value. Furthermore, the test (max_length == min_length) is used

to determine whether the characteristic value has variable length. This is

slightly confusing and also causes problems if the user wishes to use a

characteristic with variable length but the initial lenght is equal to max

length.



To solve this problem the characteristic is now always committed to the

SoftDevice as variable. Furthermore, the API only maintains the current lenght

and the max length i.e. the field initialLen in the GattAttribute is removed.

Finally, the constructor for the GattCharacteristic was modified to reflect

these changes.



*NOTES:*

* This change requires updates to ble-nrf51822.

* Ideally we would like the characteristics to be declared as 'variable' only

when necessary, but this requires changing the signature of the

GattCharacteristic and GattAttribute constructures. Therefore, it will be part

of a separate pull request.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rgrover1 710:b2e1a2660ec2 1 /* mbed Microcontroller Library
rgrover1 710:b2e1a2660ec2 2 * Copyright (c) 2006-2013 ARM Limited
rgrover1 710:b2e1a2660ec2 3 *
rgrover1 710:b2e1a2660ec2 4 * Licensed under the Apache License, Version 2.0 (the "License");
rgrover1 710:b2e1a2660ec2 5 * you may not use this file except in compliance with the License.
rgrover1 710:b2e1a2660ec2 6 * You may obtain a copy of the License at
rgrover1 710:b2e1a2660ec2 7 *
rgrover1 710:b2e1a2660ec2 8 * http://www.apache.org/licenses/LICENSE-2.0
rgrover1 710:b2e1a2660ec2 9 *
rgrover1 710:b2e1a2660ec2 10 * Unless required by applicable law or agreed to in writing, software
rgrover1 710:b2e1a2660ec2 11 * distributed under the License is distributed on an "AS IS" BASIS,
rgrover1 710:b2e1a2660ec2 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rgrover1 710:b2e1a2660ec2 13 * See the License for the specific language governing permissions and
rgrover1 710:b2e1a2660ec2 14 * limitations under the License.
rgrover1 710:b2e1a2660ec2 15 */
rgrover1 710:b2e1a2660ec2 16
rgrover1 710:b2e1a2660ec2 17 #ifndef __GATT_ATTRIBUTE_H__
rgrover1 710:b2e1a2660ec2 18 #define __GATT_ATTRIBUTE_H__
rgrover1 710:b2e1a2660ec2 19
rgrover1 710:b2e1a2660ec2 20 #include "UUID.h"
rgrover1 710:b2e1a2660ec2 21
rgrover1 710:b2e1a2660ec2 22 class GattAttribute {
rgrover1 710:b2e1a2660ec2 23 public:
rgrover1 710:b2e1a2660ec2 24 typedef uint16_t Handle_t;
rgrover1 710:b2e1a2660ec2 25 static const Handle_t INVALID_HANDLE = 0x0000;
rgrover1 710:b2e1a2660ec2 26
rgrover1 710:b2e1a2660ec2 27 public:
rgrover1 710:b2e1a2660ec2 28 /**
rgrover1 710:b2e1a2660ec2 29 * @brief Creates a new GattAttribute using the specified
rgrover1 993:4d62b7967c11 30 * UUID, value length, and inital value.
rgrover1 710:b2e1a2660ec2 31 *
rgrover1 710:b2e1a2660ec2 32 * @param[in] uuid
rgrover1 993:4d62b7967c11 33 * The UUID to use for this attribute.
rgrover1 710:b2e1a2660ec2 34 * @param[in] valuePtr
rgrover1 710:b2e1a2660ec2 35 * The memory holding the initial value.
rgrover1 996:14aeadec4695 36 * @param[in] len
rgrover1 996:14aeadec4695 37 * The length in bytes of this attribute's value.
rgrover1 710:b2e1a2660ec2 38 * @param[in] maxLen
rgrover1 993:4d62b7967c11 39 * The max length in bytes of this attribute's value.
rgrover1 710:b2e1a2660ec2 40 *
rgrover1 710:b2e1a2660ec2 41 * @section EXAMPLE
rgrover1 710:b2e1a2660ec2 42 *
rgrover1 710:b2e1a2660ec2 43 * @code
rgrover1 710:b2e1a2660ec2 44 *
rgrover1 710:b2e1a2660ec2 45 * // UUID = 0x2A19, Min length 2, Max len = 2
rgrover1 710:b2e1a2660ec2 46 * GattAttribute attr = GattAttribute(0x2A19, &someValue, 2, 2);
rgrover1 710:b2e1a2660ec2 47 *
rgrover1 710:b2e1a2660ec2 48 * @endcode
rgrover1 710:b2e1a2660ec2 49 */
rgrover1 996:14aeadec4695 50 GattAttribute(const UUID &uuid, uint8_t *valuePtr = NULL, uint16_t len = 0, uint16_t maxLen = 0) :
rgrover1 996:14aeadec4695 51 _uuid(uuid), _valuePtr(valuePtr), _lenMax(maxLen), _len(len), _handle() {
rgrover1 993:4d62b7967c11 52 /* Empty */
rgrover1 710:b2e1a2660ec2 53 }
rgrover1 710:b2e1a2660ec2 54
rgrover1 710:b2e1a2660ec2 55 public:
rgrover1 710:b2e1a2660ec2 56 Handle_t getHandle(void) const {return _handle; }
rgrover1 710:b2e1a2660ec2 57 const UUID &getUUID(void) const {return _uuid; }
rgrover1 710:b2e1a2660ec2 58 uint16_t getLength(void) const {return _len; }
rgrover1 710:b2e1a2660ec2 59 uint16_t getMaxLength(void) const {return _lenMax; }
rgrover1 710:b2e1a2660ec2 60 uint16_t *getLengthPtr(void) {return &_len; }
rgrover1 710:b2e1a2660ec2 61 void setHandle(Handle_t id) {_handle = id; }
rgrover1 710:b2e1a2660ec2 62 uint8_t *getValuePtr(void) {return _valuePtr; }
rgrover1 710:b2e1a2660ec2 63
rgrover1 710:b2e1a2660ec2 64 private:
rgrover1 993:4d62b7967c11 65 UUID _uuid; /* Characteristic UUID. */
rgrover1 710:b2e1a2660ec2 66 uint8_t *_valuePtr;
rgrover1 993:4d62b7967c11 67 uint16_t _lenMax; /* Maximum length of the value. */
rgrover1 993:4d62b7967c11 68 uint16_t _len; /* Current length of the value. */
rgrover1 710:b2e1a2660ec2 69 Handle_t _handle;
rgrover1 710:b2e1a2660ec2 70
rgrover1 710:b2e1a2660ec2 71 private:
rgrover1 993:4d62b7967c11 72 /* Disallow copy and assignment. */
rgrover1 710:b2e1a2660ec2 73 GattAttribute(const GattAttribute &);
rgrover1 710:b2e1a2660ec2 74 GattAttribute& operator=(const GattAttribute &);
rgrover1 710:b2e1a2660ec2 75 };
rgrover1 710:b2e1a2660ec2 76
rgrover1 710:b2e1a2660ec2 77 #endif // ifndef __GATT_ATTRIBUTE_H__