main.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2015 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 <events/mbed_events.h>
00018 #include <mbed.h>
00019 #include "ble/BLE.h"
00020 #include "ble/DiscoveredCharacteristic.h"
00021 #include "ble/DiscoveredService.h"
00022 
00023 DigitalOut alivenessLED(LED1, 1);
00024 static DiscoveredCharacteristic ledCharacteristic;
00025 static bool triggerLedCharacteristic;
00026 static const char PEER_NAME[] = "LED";
00027 static EventQueue eventQueue(/* event count */ 128 * EVENTS_EVENT_SIZE);
00028 
00029 void periodicCallback(void) {
00030     alivenessLED = !alivenessLED; /* Do blinky on LED1 while we're waiting for BLE events */
00031 }
00032 
00033 void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params) {
00034     // parse the advertising payload, looking for data type COMPLETE_LOCAL_NAME
00035     // The advertising payload is a collection of key/value records where
00036     // byte 0: length of the record excluding this byte
00037     // byte 1: The key, it is the type of the data
00038     // byte [2..N] The value. N is equal to byte0 - 1
00039     for (uint8_t i = 0; i < params->advertisingDataLen; ++i) {
00040 
00041         const uint8_t record_length = params->advertisingData[i];
00042         if (record_length == 0) {
00043             continue;
00044         }
00045         const uint8_t type = params->advertisingData[i + 1];
00046         const uint8_t* value = params->advertisingData + i + 2;
00047         const uint8_t value_length = record_length - 1;
00048 
00049         if(type == GapAdvertisingData::COMPLETE_LOCAL_NAME) {
00050             if ((value_length == sizeof(PEER_NAME)) && (memcmp(value, PEER_NAME, value_length) == 0)) {
00051                 printf(
00052                     "adv peerAddr[%02x %02x %02x %02x %02x %02x] rssi %d, isScanResponse %u, AdvertisementType %u\r\n",
00053                     params->peerAddr[5], params->peerAddr[4], params->peerAddr[3], params->peerAddr[2],
00054                     params->peerAddr[1], params->peerAddr[0], params->rssi, params->isScanResponse, params->type
00055                 );
00056                 BLE::Instance().gap().connect(params->peerAddr, Gap::ADDR_TYPE_RANDOM_STATIC, NULL, NULL);
00057                 break;
00058             }
00059         }
00060         i += record_length;
00061     }
00062 }
00063 
00064 void serviceDiscoveryCallback(const DiscoveredService *service) {
00065     if (service->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) {
00066         printf("S UUID-%x attrs[%u %u]\r\n", service->getUUID().getShortUUID(), service->getStartHandle(), service->getEndHandle());
00067     } else {
00068         printf("S UUID-");
00069         const uint8_t *longUUIDBytes = service->getUUID().getBaseUUID();
00070         for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
00071             printf("%02x", longUUIDBytes[i]);
00072         }
00073         printf(" attrs[%u %u]\r\n", service->getStartHandle(), service->getEndHandle());
00074     }
00075 }
00076 
00077 void updateLedCharacteristic(void) {
00078     if (!BLE::Instance().gattClient().isServiceDiscoveryActive()) {
00079         ledCharacteristic.read();
00080     }
00081 }
00082 
00083 void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) {
00084     printf("  C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getUUID().getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast());
00085     if (characteristicP->getUUID().getShortUUID() == 0xa001) { /* !ALERT! Alter this filter to suit your device. */
00086         ledCharacteristic        = *characteristicP;
00087         triggerLedCharacteristic = true;
00088     }
00089 }
00090 
00091 void discoveryTerminationCallback(Gap::Handle_t connectionHandle) {
00092     printf("terminated SD for handle %u\r\n", connectionHandle);
00093     if (triggerLedCharacteristic) {
00094         triggerLedCharacteristic = false;
00095         eventQueue.call(updateLedCharacteristic);
00096     }
00097 }
00098 
00099 void connectionCallback(const Gap::ConnectionCallbackParams_t *params) {
00100     if (params->role == Gap::CENTRAL) {
00101         BLE &ble = BLE::Instance();
00102         ble.gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback);
00103         ble.gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback, 0xa000, 0xa001);
00104     }
00105 }
00106 
00107 void triggerToggledWrite(const GattReadCallbackParams *response) {
00108 
00109     if (response->handle == ledCharacteristic.getValueHandle()) {
00110         printf("triggerToggledWrite: handle %u, offset %u, len %u\r\n", response->handle, response->offset, response->len);
00111         for (unsigned index = 0; index < response->len; index++) {
00112             printf("%c[%02x]", response->data[index], response->data[index]);
00113         }
00114         printf("\r\n");
00115 
00116         uint8_t toggledValue = response->data[0] ^ 0x1;
00117         ledCharacteristic.write(1, &toggledValue);
00118     }
00119 }
00120 
00121 void triggerRead(const GattWriteCallbackParams *response) {
00122     if (response->handle == ledCharacteristic.getValueHandle()) {
00123         ledCharacteristic.read();
00124     }
00125 }
00126 
00127 void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *) {
00128     printf("disconnected\r\n");
00129     /* Start scanning and try to connect again */
00130     BLE::Instance().gap().startScan(advertisementCallback);
00131 }
00132 
00133 void onBleInitError(BLE &ble, ble_error_t error)
00134 {
00135    /* Initialization error handling should go here */
00136    printf("Initialization error\r\n");
00137 }
00138 
00139 void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
00140 {
00141     BLE&        ble   = params->ble;
00142     ble_error_t error = params->error;
00143 
00144     if (error != BLE_ERROR_NONE) {
00145         /* In case of error, forward the error handling to onBleInitError */
00146         onBleInitError(ble, error);
00147         return;
00148     }
00149 
00150     /* Ensure that it is the default instance of BLE */
00151     if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
00152         return;
00153     }
00154 
00155     ble.gap().onDisconnection(disconnectionCallback);
00156     ble.gap().onConnection(connectionCallback);
00157     ble.gattClient().onDataRead(triggerToggledWrite);
00158     ble.gattClient().onDataWrite(triggerRead);
00159     // scan interval: 400ms and scan window: 400ms.
00160     // Every 400ms the device will scan for 400ms
00161     // This means that the device will scan continuously.
00162     ble.gap().setScanParams(400, 400);
00163     ble.gap().startScan(advertisementCallback);
00164 }
00165 
00166 void scheduleBleEventsProcessing(BLE::OnEventsToProcessCallbackContext* context) {
00167     BLE &ble = BLE::Instance();
00168     eventQueue.call(Callback<void()>(&ble, &BLE::processEvents));
00169 }
00170 
00171 
00172 int main()
00173 {
00174     triggerLedCharacteristic = false;
00175     eventQueue.call_every(5000, periodicCallback);
00176     BLE &ble = BLE::Instance();
00177     ble.onEventsToProcess(scheduleBleEventsProcessing);
00178     ble.init(bleInitComplete);
00179     eventQueue.dispatch_forever();
00180     return 0;
00181 }