Delta / Mbed OS Delta_BLE_LEDBlinker

Example of BLE scan/connect/service discovery

Fork of BLE_LEDBlinker by Bluetooth Low Energy

main.cpp@12:f0ffc006e62d, 2016-12-09 (annotated)

Committer:
tsungta
Date:
Fri Dec 09 09:12:57 2016 +0000
Revision:
12:f0ffc006e62d
Parent:
11:023d96b0e427
Child:
13:75f95a5cf9c1
First commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rgrover1 0:415d7f24cb91 1 /* mbed Microcontroller Library
rgrover1 0:415d7f24cb91 2 * Copyright (c) 2006-2015 ARM Limited
rgrover1 0:415d7f24cb91 3 *
rgrover1 0:415d7f24cb91 4 * Licensed under the Apache License, Version 2.0 (the "License");
rgrover1 0:415d7f24cb91 5 * you may not use this file except in compliance with the License.
rgrover1 0:415d7f24cb91 6 * You may obtain a copy of the License at
rgrover1 0:415d7f24cb91 7 *
rgrover1 0:415d7f24cb91 8 * http://www.apache.org/licenses/LICENSE-2.0
rgrover1 0:415d7f24cb91 9 *
rgrover1 0:415d7f24cb91 10 * Unless required by applicable law or agreed to in writing, software
rgrover1 0:415d7f24cb91 11 * distributed under the License is distributed on an "AS IS" BASIS,
rgrover1 0:415d7f24cb91 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rgrover1 0:415d7f24cb91 13 * See the License for the specific language governing permissions and
rgrover1 0:415d7f24cb91 14 * limitations under the License.
rgrover1 0:415d7f24cb91 15 */
rgrover1 0:415d7f24cb91 16
rgrover1 0:415d7f24cb91 17 #include "mbed.h"
rgrover1 6:1730f66fb14d 18 #include "ble/BLE.h"
rgrover1 6:1730f66fb14d 19 #include "ble/DiscoveredCharacteristic.h"
rgrover1 6:1730f66fb14d 20 #include "ble/DiscoveredService.h"
rgrover1 0:415d7f24cb91 21
andresag 11:023d96b0e427 22 DigitalOut alivenessLED(LED1, 1);
rgrover1 6:1730f66fb14d 23
andresag 11:023d96b0e427 24 bool triggerLedCharacteristic = false;
rgrover1 0:415d7f24cb91 25 DiscoveredCharacteristic ledCharacteristic;
rgrover1 0:415d7f24cb91 26
andresag 11:023d96b0e427 27 Ticker ticker;
andresag 11:023d96b0e427 28
rgrover1 0:415d7f24cb91 29 void periodicCallback(void) {
rgrover1 3:146eba831693 30 alivenessLED = !alivenessLED; /* Do blinky on LED1 while we're waiting for BLE events */
rgrover1 0:415d7f24cb91 31 }
rgrover1 0:415d7f24cb91 32
rgrover1 0:415d7f24cb91 33 void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params) {
tsungta 12:f0ffc006e62d 34 if (params->peerAddr[0] != 0xF9) { /* !ALERT! Alter this filter to suit your device. */
rgrover1 0:415d7f24cb91 35 return;
rgrover1 0:415d7f24cb91 36 }
rgrover1 0:415d7f24cb91 37 printf("adv peerAddr[%02x %02x %02x %02x %02x %02x] rssi %d, isScanResponse %u, AdvertisementType %u\r\n",
rgrover1 0:415d7f24cb91 38 params->peerAddr[5], params->peerAddr[4], params->peerAddr[3], params->peerAddr[2], params->peerAddr[1], params->peerAddr[0],
rgrover1 0:415d7f24cb91 39 params->rssi, params->isScanResponse, params->type);
rgrover1 0:415d7f24cb91 40
andresag 11:023d96b0e427 41 BLE::Instance().gap().connect(params->peerAddr, Gap::ADDR_TYPE_RANDOM_STATIC, NULL, NULL);
rgrover1 0:415d7f24cb91 42 }
rgrover1 0:415d7f24cb91 43
rgrover1 0:415d7f24cb91 44 void serviceDiscoveryCallback(const DiscoveredService *service) {
tsungta 12:f0ffc006e62d 45 printf("serviceDiscoveryCallback\n");
rgrover1 0:415d7f24cb91 46 if (service->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) {
rgrover1 0:415d7f24cb91 47 printf("S UUID-%x attrs[%u %u]\r\n", service->getUUID().getShortUUID(), service->getStartHandle(), service->getEndHandle());
rgrover1 0:415d7f24cb91 48 } else {
rgrover1 0:415d7f24cb91 49 printf("S UUID-");
rgrover1 0:415d7f24cb91 50 const uint8_t *longUUIDBytes = service->getUUID().getBaseUUID();
rgrover1 0:415d7f24cb91 51 for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
rgrover1 0:415d7f24cb91 52 printf("%02x", longUUIDBytes[i]);
rgrover1 0:415d7f24cb91 53 }
rgrover1 0:415d7f24cb91 54 printf(" attrs[%u %u]\r\n", service->getStartHandle(), service->getEndHandle());
rgrover1 0:415d7f24cb91 55 }
rgrover1 0:415d7f24cb91 56 }
rgrover1 0:415d7f24cb91 57
rgrover1 0:415d7f24cb91 58 void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) {
tsungta 12:f0ffc006e62d 59 if (characteristicP->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) {
tsungta 12:f0ffc006e62d 60 printf(" C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getUUID().getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast());
tsungta 12:f0ffc006e62d 61 if (characteristicP->getUUID().getShortUUID() == 0x2a19) { /* !ALERT! Alter this filter to suit your device. */
tsungta 12:f0ffc006e62d 62 ledCharacteristic = *characteristicP;
tsungta 12:f0ffc006e62d 63 triggerLedCharacteristic = true;
tsungta 12:f0ffc006e62d 64 }
tsungta 12:f0ffc006e62d 65 }
tsungta 12:f0ffc006e62d 66 else {
tsungta 12:f0ffc006e62d 67 printf(" C UUID-");
tsungta 12:f0ffc006e62d 68 const uint8_t *longUUIDBytes = characteristicP->getUUID().getBaseUUID();
tsungta 12:f0ffc006e62d 69 for (unsigned i = (UUID::LENGTH_OF_LONG_UUID) - 1; i < UUID::LENGTH_OF_LONG_UUID; i--) {
tsungta 12:f0ffc006e62d 70 printf("%02x ", longUUIDBytes[i]);
tsungta 12:f0ffc006e62d 71 }
tsungta 12:f0ffc006e62d 72 printf(" valueAttr[%u] props[%x]\r\n", characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast());
rgrover1 0:415d7f24cb91 73 }
rgrover1 0:415d7f24cb91 74 }
rgrover1 0:415d7f24cb91 75
rgrover1 0:415d7f24cb91 76 void discoveryTerminationCallback(Gap::Handle_t connectionHandle) {
rgrover1 0:415d7f24cb91 77 printf("terminated SD for handle %u\r\n", connectionHandle);
rgrover1 0:415d7f24cb91 78 }
rgrover1 0:415d7f24cb91 79
rgrover1 0:415d7f24cb91 80 void connectionCallback(const Gap::ConnectionCallbackParams_t *params) {
tsungta 12:f0ffc006e62d 81 printf("connectionCallback\n");
rgrover1 0:415d7f24cb91 82 if (params->role == Gap::CENTRAL) {
andresag 11:023d96b0e427 83 BLE::Instance().gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback);
tsungta 12:f0ffc006e62d 84 BLE::Instance().gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback);
rgrover1 0:415d7f24cb91 85 }
rgrover1 0:415d7f24cb91 86 }
rgrover1 0:415d7f24cb91 87
rgrover1 0:415d7f24cb91 88 void triggerToggledWrite(const GattReadCallbackParams *response) {
rgrover1 0:415d7f24cb91 89 if (response->handle == ledCharacteristic.getValueHandle()) {
rgrover1 0:415d7f24cb91 90 #if DUMP_READ_DATA
rgrover1 0:415d7f24cb91 91 printf("triggerToggledWrite: handle %u, offset %u, len %u\r\n", response->handle, response->offset, response->len);
rgrover1 0:415d7f24cb91 92 for (unsigned index = 0; index < response->len; index++) {
rgrover1 0:415d7f24cb91 93 printf("%c[%02x]", response->data[index], response->data[index]);
rgrover1 0:415d7f24cb91 94 }
rgrover1 0:415d7f24cb91 95 printf("\r\n");
rgrover1 0:415d7f24cb91 96 #endif
rgrover1 0:415d7f24cb91 97
rgrover1 0:415d7f24cb91 98 uint8_t toggledValue = response->data[0] ^ 0x1;
rgrover1 0:415d7f24cb91 99 ledCharacteristic.write(1, &toggledValue);
rgrover1 0:415d7f24cb91 100 }
rgrover1 0:415d7f24cb91 101 }
rgrover1 0:415d7f24cb91 102
rgrover1 0:415d7f24cb91 103 void triggerRead(const GattWriteCallbackParams *response) {
rgrover1 0:415d7f24cb91 104 if (response->handle == ledCharacteristic.getValueHandle()) {
rgrover1 0:415d7f24cb91 105 ledCharacteristic.read();
rgrover1 0:415d7f24cb91 106 }
rgrover1 0:415d7f24cb91 107 }
rgrover1 0:415d7f24cb91 108
rgrover1 10:507318f2afda 109 void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params) {
rgrover1 0:415d7f24cb91 110 printf("disconnected\r\n");
rgrover1 0:415d7f24cb91 111 }
rgrover1 0:415d7f24cb91 112
andresag 11:023d96b0e427 113 /**
andresag 11:023d96b0e427 114 * This function is called when the ble initialization process has failed
andresag 11:023d96b0e427 115 */
andresag 11:023d96b0e427 116 void onBleInitError(BLE &ble, ble_error_t error)
andresag 11:023d96b0e427 117 {
andresag 11:023d96b0e427 118 /* Initialization error handling should go here */
andresag 11:023d96b0e427 119 }
rgrover1 0:415d7f24cb91 120
andresag 11:023d96b0e427 121 /**
andresag 11:023d96b0e427 122 * Callback triggered when the ble initialization process has finished
andresag 11:023d96b0e427 123 */
andresag 11:023d96b0e427 124 void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
andresag 11:023d96b0e427 125 {
andresag 11:023d96b0e427 126 BLE& ble = params->ble;
andresag 11:023d96b0e427 127 ble_error_t error = params->error;
andresag 11:023d96b0e427 128
andresag 11:023d96b0e427 129 if (error != BLE_ERROR_NONE) {
andresag 11:023d96b0e427 130 /* In case of error, forward the error handling to onBleInitError */
andresag 11:023d96b0e427 131 onBleInitError(ble, error);
andresag 11:023d96b0e427 132 return;
andresag 11:023d96b0e427 133 }
andresag 11:023d96b0e427 134
andresag 11:023d96b0e427 135 /* Ensure that it is the default instance of BLE */
andresag 11:023d96b0e427 136 if(ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
andresag 11:023d96b0e427 137 return;
andresag 11:023d96b0e427 138 }
andresag 11:023d96b0e427 139
rgrover1 5:3bbad34d1a85 140 ble.gap().onConnection(connectionCallback);
rgrover1 5:3bbad34d1a85 141 ble.gap().onDisconnection(disconnectionCallback);
rgrover1 0:415d7f24cb91 142
rgrover1 7:61e2224ec9a0 143 ble.gattClient().onDataRead(triggerToggledWrite);
rgrover1 7:61e2224ec9a0 144 ble.gattClient().onDataWrite(triggerRead);
rgrover1 0:415d7f24cb91 145
rgrover1 5:3bbad34d1a85 146 ble.gap().setScanParams(500, 400);
rgrover1 5:3bbad34d1a85 147 ble.gap().startScan(advertisementCallback);
andresag 11:023d96b0e427 148 }
andresag 11:023d96b0e427 149
andresag 11:023d96b0e427 150 int main(void) {
andresag 11:023d96b0e427 151 ticker.attach(periodicCallback, 1);
andresag 11:023d96b0e427 152
andresag 11:023d96b0e427 153 BLE &ble = BLE::Instance();
andresag 11:023d96b0e427 154 ble.init(bleInitComplete);
andresag 11:023d96b0e427 155
andresag 11:023d96b0e427 156 /* SpinWait for initialization to complete. This is necessary because the
andresag 11:023d96b0e427 157 * BLE object is used in the main loop below. */
andresag 11:023d96b0e427 158 while (ble.hasInitialized() == false) { /* spin loop */ }
tsungta 12:f0ffc006e62d 159 printf("init DONE\r\n");
rgrover1 0:415d7f24cb91 160 while (true) {
rgrover1 4:460ce53dc854 161 if (triggerLedCharacteristic && !ble.gattClient().isServiceDiscoveryActive()) {
rgrover1 1:1db45b17552e 162 triggerLedCharacteristic = false;
rgrover1 0:415d7f24cb91 163 ledCharacteristic.read(); /* We could have issued this read just as easily from
rgrover1 0:415d7f24cb91 164 * characteristicDiscoveryCallback(); but
rgrover1 2:3e1e967035cb 165 * invoking it here demonstrates the use
rgrover1 2:3e1e967035cb 166 * of isServiceDiscoveryActive() and also
rgrover1 2:3e1e967035cb 167 * the fact that it is permitted to
rgrover1 2:3e1e967035cb 168 * operate on application-local copies of
rgrover1 2:3e1e967035cb 169 * DiscoveredCharacteristic. */
rgrover1 0:415d7f24cb91 170 }
rgrover1 0:415d7f24cb91 171 ble.waitForEvent();
rgrover1 0:415d7f24cb91 172 }
rgrover1 0:415d7f24cb91 173 }