DiscoveredCharacteristic.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "ble/DiscoveredCharacteristic.h"
00018 #include "ble/GattClient.h"
00019 
00020 ble_error_t
00021 DiscoveredCharacteristic::read(uint16_t offset) const
00022 {
00023     if (!props.read()) {
00024         return BLE_ERROR_OPERATION_NOT_PERMITTED;
00025     }
00026 
00027     if (!gattc) {
00028         return BLE_ERROR_INVALID_STATE;
00029     }
00030 
00031     return gattc->read(connHandle, valueHandle, offset);
00032 }
00033 
00034 struct OneShotReadCallback {
00035     static void launch(GattClient* client, Gap::Handle_t connHandle,
00036                        GattAttribute::Handle_t handle, const GattClient::ReadCallback_t & cb) {
00037         OneShotReadCallback* oneShot = new OneShotReadCallback(client, connHandle, handle, cb);
00038         oneShot->attach();
00039         // delete will be made when this callback is called
00040     }
00041 
00042 private:
00043     OneShotReadCallback(GattClient* client, Gap::Handle_t connHandle,
00044                         GattAttribute::Handle_t handle, const GattClient::ReadCallback_t & cb) :
00045         _client(client),
00046         _connHandle(connHandle),
00047         _handle(handle),
00048         _callback(cb) { }
00049 
00050     void attach() {
00051         _client->onDataRead(makeFunctionPointer(this, &OneShotReadCallback::call));
00052     }
00053 
00054     void call(const GattReadCallbackParams* params) {
00055         // verifiy that it is the right characteristic on the right connection
00056         if (params->connHandle == _connHandle && params->handle == _handle) {
00057             _callback(params);
00058             _client->onDataRead().detach(makeFunctionPointer(this, &OneShotReadCallback::call));
00059             delete this;
00060         }
00061     }
00062 
00063     GattClient* _client;
00064     Gap::Handle_t _connHandle;
00065     GattAttribute::Handle_t _handle;
00066     GattClient::ReadCallback_t  _callback;
00067 };
00068 
00069 ble_error_t DiscoveredCharacteristic::read(uint16_t offset, const GattClient::ReadCallback_t & onRead) const {
00070     ble_error_t error = read(offset);
00071     if (error) {
00072         return error;
00073     }
00074 
00075     OneShotReadCallback::launch(gattc, connHandle, valueHandle, onRead);
00076 
00077     return error;
00078 }
00079 
00080 ble_error_t
00081 DiscoveredCharacteristic::write(uint16_t length, const uint8_t *value) const
00082 {
00083     if (!props.write()) {
00084         return BLE_ERROR_OPERATION_NOT_PERMITTED;
00085     }
00086 
00087     if (!gattc) {
00088         return BLE_ERROR_INVALID_STATE;
00089     }
00090 
00091     return gattc->write(GattClient::GATT_OP_WRITE_REQ, connHandle, valueHandle, length, value);
00092 }
00093 
00094 ble_error_t
00095 DiscoveredCharacteristic::writeWoResponse(uint16_t length, const uint8_t *value) const
00096 {
00097     if (!props.writeWoResp()) {
00098         return BLE_ERROR_OPERATION_NOT_PERMITTED;
00099     }
00100 
00101     if (!gattc) {
00102         return BLE_ERROR_INVALID_STATE;
00103     }
00104 
00105     return gattc->write(GattClient::GATT_OP_WRITE_CMD, connHandle, valueHandle, length, value);
00106 }
00107 
00108 struct OneShotWriteCallback {
00109     static void launch(GattClient* client, Gap::Handle_t connHandle,
00110                        GattAttribute::Handle_t handle, const GattClient::WriteCallback_t & cb) {
00111         OneShotWriteCallback* oneShot = new OneShotWriteCallback(client, connHandle, handle, cb);
00112         oneShot->attach();
00113         // delete will be made when this callback is called
00114     }
00115 
00116 private:
00117     OneShotWriteCallback(GattClient* client, Gap::Handle_t connHandle,
00118                         GattAttribute::Handle_t handle, const GattClient::WriteCallback_t & cb) :
00119         _client(client),
00120         _connHandle(connHandle),
00121         _handle(handle),
00122         _callback(cb) { }
00123 
00124     void attach() {
00125         _client->onDataWritten(makeFunctionPointer(this, &OneShotWriteCallback::call));
00126     }
00127 
00128     void call(const GattWriteCallbackParams* params) {
00129         // verifiy that it is the right characteristic on the right connection
00130         if (params->connHandle == _connHandle && params->handle == _handle) {
00131             _callback(params);
00132             _client->onDataWritten().detach(makeFunctionPointer(this, &OneShotWriteCallback::call));
00133             delete this;
00134         }
00135     }
00136 
00137     GattClient* _client;
00138     Gap::Handle_t _connHandle;
00139     GattAttribute::Handle_t _handle;
00140     GattClient::WriteCallback_t  _callback;
00141 };
00142 
00143 ble_error_t DiscoveredCharacteristic::write(uint16_t length, const uint8_t *value, const GattClient::WriteCallback_t & onRead) const {
00144     ble_error_t error = write(length, value);
00145     if (error) {
00146         return error;
00147     }
00148 
00149     OneShotWriteCallback::launch(gattc, connHandle, valueHandle, onRead);
00150 
00151     return error;
00152 }
00153 
00154 ble_error_t DiscoveredCharacteristic::discoverDescriptors(
00155     const CharacteristicDescriptorDiscovery::DiscoveryCallback_t& onCharacteristicDiscovered, 
00156     const CharacteristicDescriptorDiscovery::TerminationCallback_t& onTermination) const {
00157 
00158     if(!gattc) {
00159         return BLE_ERROR_INVALID_STATE;
00160     }
00161 
00162     ble_error_t err = gattc->discoverCharacteristicDescriptors(
00163         *this, onCharacteristicDiscovered, onTermination
00164     );
00165 
00166     return err;
00167 }