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 "mbed.h"
00018 #include "ble/BLE.h"
00019 #include "ble/DiscoveredCharacteristic.h"
00020 #include "ble/DiscoveredService.h"
00021 
00022 DigitalOut alivenessLED(p16, 0);
00023 InterruptIn button(p9);
00024 Serial pc(p5, p4);
00025 Ticker ticker, ticker2;
00026 
00027 static DiscoveredCharacteristic ledCharacteristic;
00028 static const char PEER_NAME[] = "LED";
00029 
00030 void periodicCallback(void) 
00031 { 
00032     alivenessLED = !alivenessLED; /* Do blinky on LED1 while we're waiting for BLE events */
00033 }
00034 
00035 void buttonPressedCallback(void)
00036 {
00037     /* Note that the buttonPressedCallback() executes in interrupt context, so it is safer to access
00038      * BLE device API from the main thread. */
00039     uint8_t toggledValue = 0x1;
00040     ledCharacteristic.write(1, &toggledValue);
00041     pc.printf("LED on... \n");
00042 }
00043 
00044 void buttonReleasedCallback(void)
00045 {
00046     /* Note that the buttonPressedCallback() executes in interrupt context, so it is safer to access
00047      * BLE device API from the main thread. */
00048     uint8_t toggledValue = 0x0;
00049     ledCharacteristic.write(1, &toggledValue);
00050     pc.printf("LED off... \n");
00051 }
00052 
00053 void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params) 
00054 {
00055     // parse the advertising payload, looking for data type COMPLETE_LOCAL_NAME
00056     // The advertising payload is a collection of key/value records where
00057     // byte 0: length of the record excluding this byte
00058     // byte 1: The key, it is the type of the data
00059     // byte [2..N] The value. N is equal to byte0 - 1
00060     for (uint8_t i = 0; i < params->advertisingDataLen; ++i) {
00061 
00062         const uint8_t record_length = params->advertisingData[i];
00063         if (record_length == 0) {
00064             continue;
00065         }
00066         const uint8_t type = params->advertisingData[i + 1];
00067         const uint8_t* value = params->advertisingData + i + 2;
00068         const uint8_t value_length = record_length - 1;
00069 
00070         if(type == GapAdvertisingData::COMPLETE_LOCAL_NAME) {
00071             if ((value_length == sizeof(PEER_NAME)) && (memcmp(value, PEER_NAME, value_length) == 0)) {
00072                 pc.printf(
00073                     "adv peerAddr[%02x %02x %02x %02x %02x %02x] rssi %d, isScanResponse %u, AdvertisementType %u\r\n",
00074                     params->peerAddr[5], params->peerAddr[4], params->peerAddr[3], params->peerAddr[2],
00075                     params->peerAddr[1], params->peerAddr[0], params->rssi, params->isScanResponse, params->type
00076                 );
00077                 BLE::Instance().gap().connect(params->peerAddr, Gap::ADDR_TYPE_RANDOM_STATIC, NULL, NULL);
00078                 break;
00079             }
00080         }
00081         i += record_length;
00082     }
00083 }
00084 
00085 void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) 
00086 {
00087     pc.printf("  C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getUUID().getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast());
00088     if (characteristicP->getUUID().getShortUUID() == 0xa001) { /* !ALERT! Alter this filter to suit your device. */
00089         ledCharacteristic        = *characteristicP;
00090     }
00091 }
00092 
00093 void connectionCallback(const Gap::ConnectionCallbackParams_t *params) 
00094 {
00095     if (params->role == Gap::CENTRAL) {
00096         BLE &ble = BLE::Instance();
00097         //ble.gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback);
00098         ble.gattClient().launchServiceDiscovery(params->handle, NULL, characteristicDiscoveryCallback, 0xa000, 0xa001);
00099     }
00100 }
00101 
00102 void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *) 
00103 {
00104     pc.printf("disconnected\r\n");
00105     /* Start scanning and try to connect again */
00106     BLE::Instance().gap().startScan(advertisementCallback);
00107 }
00108 
00109 void onBleInitError(BLE &ble, ble_error_t error)
00110 {
00111    /* Initialization error handling should go here */
00112 }
00113 
00114 void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
00115 {
00116     BLE&        ble   = params->ble;
00117     ble_error_t error = params->error;
00118 
00119     if (error != BLE_ERROR_NONE) {
00120         /* In case of error, forward the error handling to onBleInitError */
00121         onBleInitError(ble, error);
00122         return;
00123     }
00124 
00125     /* Ensure that it is the default instance of BLE */
00126     if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
00127         return;
00128     }
00129 
00130     ble.gap().onDisconnection(disconnectionCallback);
00131     ble.gap().onConnection(connectionCallback);
00132 
00133     // scan interval: 400ms and scan window: 400ms.
00134     // Every 400ms the device will scan for 400ms
00135     // This means that the device will scan continuously.
00136     ble.gap().setScanParams(400, 400);
00137     ble.gap().startScan(advertisementCallback);
00138 }
00139 
00140 
00141 int main(void) {
00142     pc.baud(115200);
00143     pc.printf("Initialization starts... \n");
00144     
00145     ticker.attach(periodicCallback, 1); /* Blink LED every second */
00146     button.fall(buttonPressedCallback);
00147     button.rise(buttonReleasedCallback);
00148 
00149     BLE &ble = BLE::Instance();
00150     ble.init(bleInitComplete);
00151     
00152     while (true) {
00153         ble.waitForEvent();
00154     }
00155 }