Diff: microbit/microbit-dal/BLE_API/source/DiscoveredCharacteristic.cpp

Revision:

0:b9164b348919

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/microbit/microbit-dal/BLE_API/source/DiscoveredCharacteristic.cpp	Mon Oct 17 12:41:20 2016 +0000
@@ -0,0 +1,167 @@
+/* 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.
+ */
+
+#include "ble/DiscoveredCharacteristic.h"
+#include "ble/GattClient.h"
+
+ble_error_t
+DiscoveredCharacteristic::read(uint16_t offset) const
+{
+    if (!props.read()) {
+        return BLE_ERROR_OPERATION_NOT_PERMITTED;
+    }
+
+    if (!gattc) {
+        return BLE_ERROR_INVALID_STATE;
+    }
+
+    return gattc->read(connHandle, valueHandle, offset);
+}
+
+struct OneShotReadCallback {
+    static void launch(GattClient* client, Gap::Handle_t connHandle,
+                       GattAttribute::Handle_t handle, const GattClient::ReadCallback_t& cb) {
+        OneShotReadCallback* oneShot = new OneShotReadCallback(client, connHandle, handle, cb);
+        oneShot->attach();
+        // delete will be made when this callback is called
+    }
+
+private:
+    OneShotReadCallback(GattClient* client, Gap::Handle_t connHandle,
+                        GattAttribute::Handle_t handle, const GattClient::ReadCallback_t& cb) :
+        _client(client),
+        _connHandle(connHandle),
+        _handle(handle),
+        _callback(cb) { }
+
+    void attach() {
+        _client->onDataRead(makeFunctionPointer(this, &OneShotReadCallback::call));
+    }
+
+    void call(const GattReadCallbackParams* params) {
+        // verifiy that it is the right characteristic on the right connection
+        if (params->connHandle == _connHandle && params->handle == _handle) {
+            _callback(params);
+            _client->onDataRead().detach(makeFunctionPointer(this, &OneShotReadCallback::call));
+            delete this;
+        }
+    }
+
+    GattClient* _client;
+    Gap::Handle_t _connHandle;
+    GattAttribute::Handle_t _handle;
+    GattClient::ReadCallback_t _callback;
+};
+
+ble_error_t DiscoveredCharacteristic::read(uint16_t offset, const GattClient::ReadCallback_t& onRead) const {
+    ble_error_t error = read(offset);
+    if (error) {
+        return error;
+    }
+
+    OneShotReadCallback::launch(gattc, connHandle, valueHandle, onRead);
+
+    return error;
+}
+
+ble_error_t
+DiscoveredCharacteristic::write(uint16_t length, const uint8_t *value) const
+{
+    if (!props.write()) {
+        return BLE_ERROR_OPERATION_NOT_PERMITTED;
+    }
+
+    if (!gattc) {
+        return BLE_ERROR_INVALID_STATE;
+    }
+
+    return gattc->write(GattClient::GATT_OP_WRITE_REQ, connHandle, valueHandle, length, value);
+}
+
+ble_error_t
+DiscoveredCharacteristic::writeWoResponse(uint16_t length, const uint8_t *value) const
+{
+    if (!props.writeWoResp()) {
+        return BLE_ERROR_OPERATION_NOT_PERMITTED;
+    }
+
+    if (!gattc) {
+        return BLE_ERROR_INVALID_STATE;
+    }
+
+    return gattc->write(GattClient::GATT_OP_WRITE_CMD, connHandle, valueHandle, length, value);
+}
+
+struct OneShotWriteCallback {
+    static void launch(GattClient* client, Gap::Handle_t connHandle,
+                       GattAttribute::Handle_t handle, const GattClient::WriteCallback_t& cb) {
+        OneShotWriteCallback* oneShot = new OneShotWriteCallback(client, connHandle, handle, cb);
+        oneShot->attach();
+        // delete will be made when this callback is called
+    }
+
+private:
+    OneShotWriteCallback(GattClient* client, Gap::Handle_t connHandle,
+                        GattAttribute::Handle_t handle, const GattClient::WriteCallback_t& cb) :
+        _client(client),
+        _connHandle(connHandle),
+        _handle(handle),
+        _callback(cb) { }
+
+    void attach() {
+        _client->onDataWritten(makeFunctionPointer(this, &OneShotWriteCallback::call));
+    }
+
+    void call(const GattWriteCallbackParams* params) {
+        // verifiy that it is the right characteristic on the right connection
+        if (params->connHandle == _connHandle && params->handle == _handle) {
+            _callback(params);
+            _client->onDataWritten().detach(makeFunctionPointer(this, &OneShotWriteCallback::call));
+            delete this;
+        }
+    }
+
+    GattClient* _client;
+    Gap::Handle_t _connHandle;
+    GattAttribute::Handle_t _handle;
+    GattClient::WriteCallback_t _callback;
+};
+
+ble_error_t DiscoveredCharacteristic::write(uint16_t length, const uint8_t *value, const GattClient::WriteCallback_t& onRead) const {
+    ble_error_t error = write(length, value);
+    if (error) {
+        return error;
+    }
+
+    OneShotWriteCallback::launch(gattc, connHandle, valueHandle, onRead);
+
+    return error;
+}
+
+ble_error_t DiscoveredCharacteristic::discoverDescriptors(
+    const CharacteristicDescriptorDiscovery::DiscoveryCallback_t& onCharacteristicDiscovered, 
+    const CharacteristicDescriptorDiscovery::TerminationCallback_t& onTermination) const {
+
+    if(!gattc) {
+        return BLE_ERROR_INVALID_STATE;
+    }
+
+    ble_error_t err = gattc->discoverCharacteristicDescriptors(
+        *this, onCharacteristicDiscovered, onTermination
+    );
+
+    return err;
+}
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