main.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 "mbed.h"
00018 #include "ble/BLE.h"
00019 #include "ble/DiscoveredCharacteristic.h"
00020 #include "ble/DiscoveredService.h"
00021 
00022 #define SCAN_INT  0x30 // 30 ms = 48 * 0.625 ms
00023 #define SCAN_WIND 0x30 // 30 ms = 48 * 0.625 ms
00024 
00025  
00026 const Gap::Address_t  BLE_address_BE       = {0xCC, 0x00, 0x00, 0xE1, 0x80, 0x02};
00027 const Gap::Address_t  BLE_peer_address_BE  = {0xFD, 0x66, 0x05, 0x13, 0xBE, 0xBA};
00028 
00029 DiscoveredCharacteristic ledCharacteristic;
00030 
00031 uint8_t toggledValue = 0;
00032 enum {
00033   READ = 0,
00034   WRITE,
00035   IDLE
00036 };
00037 static volatile unsigned int triggerOp = IDLE;
00038 
00039 void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
00040 {
00041     (void)params;
00042     printf("disconnected\n\r");
00043 }
00044 
00045 void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params) {
00046     if (params->peerAddr[0] != BLE_peer_address_BE[0]) {
00047         return;
00048     }
00049     
00050     printf("adv peerAddr[%02x %02x %02x %02x %02x %02x] rssi %d, isScanResponse %u, AdvertisementType %u\r\n",
00051            params->peerAddr[5], params->peerAddr[4], params->peerAddr[3], params->peerAddr[2], params->peerAddr[1], params->peerAddr[0],
00052            params->rssi, params->isScanResponse, params->type);
00053     
00054     if(!params->isScanResponse) {
00055       BLE::Instance().gap().connect(params->peerAddr, Gap::ADDR_TYPE_PUBLIC, NULL, NULL);
00056     }
00057 }
00058 
00059 void discoveryTerminationCallback(Gap::Handle_t connectionHandle) {
00060     printf("terminated SD for handle %u\r\n", connectionHandle);
00061 }
00062 
00063 void serviceDiscoveryCallback(const DiscoveredService *service) {
00064     if (service->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) {
00065         printf("S UUID-%x attrs[%u %u]\r\n", service->getUUID().getShortUUID(), service->getStartHandle(), service->getEndHandle());
00066     } else {
00067         printf("S UUID-");
00068         const uint8_t *longUUIDBytes = service->getUUID().getBaseUUID();
00069         for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
00070             printf("%02X", longUUIDBytes[i]);
00071         }
00072         printf(" attrs[%u %u]\r\n", service->getStartHandle(), service->getEndHandle());
00073     }
00074 }
00075  
00076 void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) {
00077     //printf("  C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast());
00078     if (characteristicP->getUUID().getShortUUID() == 0xa001) { /* !ALERT! Alter this filter to suit your device. */
00079       //printf("  C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast());
00080       ledCharacteristic = *characteristicP;
00081       triggerOp = READ;
00082     }
00083 }
00084 
00085 void connectionCallback(const Gap::ConnectionCallbackParams_t *params) {
00086   uint16_t LED_SERVICE_UUID = 0xA000;
00087   uint16_t LED_STATE_CHARACTERISTIC_UUID = 0xA001;
00088   
00089   if (params->role == Gap::CENTRAL) {
00090     BLE &ble = BLE::Instance();
00091     ble.gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback);
00092     ble.gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback, LED_SERVICE_UUID, LED_STATE_CHARACTERISTIC_UUID);
00093   }
00094 }
00095 
00096 void triggerToggledWrite(const GattReadCallbackParams *response) {
00097   if (response->handle == ledCharacteristic.getValueHandle()) {
00098 #if 0
00099     printf("triggerToggledWrite: handle %u, offset %u, len %u\r\n", response->handle, response->offset, response->len);
00100     for (unsigned index = 0; index < response->len; index++) {
00101       printf("%c[%02x]", response->data[index], response->data[index]);
00102     }
00103     printf("\r\n");
00104 #endif
00105     
00106     toggledValue = response->data[0] ^ 0x1;
00107     triggerOp = WRITE;
00108   }
00109 }
00110 
00111 void triggerRead(const GattWriteCallbackParams *response) {
00112   if (response->handle == ledCharacteristic.getValueHandle()) {
00113     triggerOp = READ;
00114   }
00115 }
00116 
00117 /** 
00118  * This function is called when the ble initialization process has failled 
00119  */ 
00120 void onBleInitError(BLE &ble, ble_error_t error) 
00121 { 
00122     /* Initialization error handling should go here */ 
00123 }
00124 
00125 /** 
00126  * Callback triggered when the ble initialization process has finished 
00127  */ 
00128 void bleInitComplete(BLE::InitializationCompleteCallbackContext *params) 
00129 {
00130     BLE&        ble   = params->ble;
00131     ble_error_t error = params->error;
00132 
00133     if (error != BLE_ERROR_NONE) {
00134         /* In case of error, forward the error handling to onBleInitError */
00135         onBleInitError(ble, error);
00136         return;
00137     }
00138 
00139     /* Ensure that it is the default instance of BLE */
00140     if(ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
00141         return;
00142     }
00143 
00144     // Set BT Address
00145     ble.gap().setAddress(BLEProtocol::AddressType::PUBLIC, BLE_address_BE);
00146 
00147     ble.gap().onConnection(connectionCallback);
00148     ble.onDisconnection(disconnectionCallback);
00149        
00150     ble.gattClient().onDataRead(triggerToggledWrite);
00151     ble.gattClient().onDataWrite(triggerRead);
00152 
00153     ble.gap().setScanParams(SCAN_INT, SCAN_WIND);
00154     ble.gap().startScan(advertisementCallback);
00155  
00156     // infinite loop
00157     while (1) {
00158       if (!ble.gattClient().isServiceDiscoveryActive()) {
00159         switch(triggerOp) {
00160         case READ:
00161           triggerOp = IDLE;
00162           ledCharacteristic.read();
00163           break;
00164         case WRITE:
00165           triggerOp = IDLE;
00166           ledCharacteristic.write(1, &toggledValue);
00167           break;
00168         }
00169       }
00170       ble.waitForEvent();
00171     }
00172 }
00173 
00174 int main(void)
00175 {
00176     BLE::Instance().init(bleInitComplete);
00177 }