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 
00028 static EventQueue eventQueue(/* event count */ 16 * EVENTS_EVENT_SIZE);
00029 
00030 void periodicCallback(void) {
00031     alivenessLED = !alivenessLED; /* Do blinky on LED1 while we're waiting for BLE events */
00032 }
00033 
00034 void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params) {
00035     // parse the advertising payload, looking for data type COMPLETE_LOCAL_NAME
00036     // The advertising payload is a collection of key/value records where
00037     // byte 0: length of the record excluding this byte
00038     // byte 1: The key, it is the type of the data
00039     // byte [2..N] The value. N is equal to byte0 - 1
00040     for (uint8_t i = 0; i < params->advertisingDataLen; ++i) {
00041 
00042         const uint8_t record_length = params->advertisingData[i];
00043         if (record_length == 0) {
00044             continue;
00045         }
00046         const uint8_t type = params->advertisingData[i + 1];
00047         const uint8_t* value = params->advertisingData + i + 2;
00048         const uint8_t value_length = record_length - 1;
00049 
00050         if(type == GapAdvertisingData::COMPLETE_LOCAL_NAME) {
00051             if ((value_length == sizeof(PEER_NAME)) && (memcmp(value, PEER_NAME, value_length) == 0)) {
00052                 printf(
00053                     "adv peerAddr[%02x %02x %02x %02x %02x %02x] rssi %d, isScanResponse %u, AdvertisementType %u\r\n",
00054                     params->peerAddr[5], params->peerAddr[4], params->peerAddr[3], params->peerAddr[2],
00055                     params->peerAddr[1], params->peerAddr[0], params->rssi, params->isScanResponse, params->type
00056                 );
00057                 BLE::Instance().gap().connect(params->peerAddr, Gap::ADDR_TYPE_RANDOM_STATIC, NULL, NULL);
00058                 break;
00059             }
00060         }
00061         i += record_length;
00062     }
00063 }
00064 
00065 void serviceDiscoveryCallback(const DiscoveredService *service) {
00066     if (service->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) {
00067         printf("S UUID-%x attrs[%u %u]\r\n", service->getUUID().getShortUUID(), service->getStartHandle(), service->getEndHandle());
00068     } else {
00069         printf("S UUID-");
00070         const uint8_t *longUUIDBytes = service->getUUID().getBaseUUID();
00071         for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
00072             printf("%02x", longUUIDBytes[i]);
00073         }
00074         printf(" attrs[%u %u]\r\n", service->getStartHandle(), service->getEndHandle());
00075     }
00076 }
00077 
00078 void updateLedCharacteristic(void) {
00079     if (!BLE::Instance().gattClient().isServiceDiscoveryActive()) {
00080         ledCharacteristic.read();
00081     }
00082 }
00083 
00084 void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) {
00085     printf("  C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getUUID().getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast());
00086     if (characteristicP->getUUID().getShortUUID() == 0xa001) { /* !ALERT! Alter this filter to suit your device. */
00087         ledCharacteristic        = *characteristicP;
00088         triggerLedCharacteristic = true;
00089     }
00090 }
00091 
00092 void discoveryTerminationCallback(Gap::Handle_t connectionHandle) {
00093     printf("terminated SD for handle %u\r\n", connectionHandle);
00094     if (triggerLedCharacteristic) {
00095         triggerLedCharacteristic = false;
00096         eventQueue.call(updateLedCharacteristic);
00097     }
00098 }
00099 
00100 void connectionCallback(const Gap::ConnectionCallbackParams_t *params) {
00101     if (params->role == Gap::CENTRAL) {
00102         BLE &ble = BLE::Instance();
00103         ble.gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback);
00104         ble.gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback, 0xa000, 0xa001);
00105     }
00106 }
00107 
00108 void triggerToggledWrite(const GattReadCallbackParams *response) {
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 }
00137 
00138 void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
00139 {
00140     BLE&        ble   = params->ble;
00141     ble_error_t error = params->error;
00142 
00143     if (error != BLE_ERROR_NONE) {
00144         /* In case of error, forward the error handling to onBleInitError */
00145         onBleInitError(ble, error);
00146         return;
00147     }
00148 
00149     /* Ensure that it is the default instance of BLE */
00150     if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
00151         return;
00152     }
00153 
00154     ble.gap().onDisconnection(disconnectionCallback);
00155     ble.gap().onConnection(connectionCallback);
00156 
00157     ble.gattClient().onDataRead(triggerToggledWrite);
00158     ble.gattClient().onDataWrite(triggerRead);
00159 
00160     // scan interval: 400ms and scan window: 400ms.
00161     // Every 400ms the device will scan for 400ms
00162     // This means that the device will scan continuously.
00163     ble.gap().setScanParams(400, 400);
00164     ble.gap().startScan(advertisementCallback);
00165 }
00166 
00167 void scheduleBleEventsProcessing(BLE::OnEventsToProcessCallbackContext* context) {
00168     BLE &ble = BLE::Instance();
00169     eventQueue.call(Callback<void()>(&ble, &BLE::processEvents));
00170 }
00171 
00172 int main()
00173 {
00174     triggerLedCharacteristic = false;
00175     eventQueue.call_every(500, periodicCallback);
00176 
00177     BLE &ble = BLE::Instance();
00178     ble.onEventsToProcess(scheduleBleEventsProcessing);
00179     ble.init(bleInitComplete);
00180 
00181     eventQueue.dispatch_forever();
00182 
00183     return 0;
00184 }