Andrea Vicari / Mbed OS BLELedControlButton

Modify the BLE LED Control so that it toggles the LED on the other board only if you keep the button pressed

source/main.cpp@0:8c76e25a3cff, 2018-11-29 (annotated)

Committer:
vicara
Date:
Thu Nov 29 18:32:03 2018 +0000
Revision:
0:8c76e25a3cff
Modify the BLE LED Control so that it; toggles the LED on the other board only if; you keep the button pressed

Who changed what in which revision?

UserRevisionLine numberNew contents of line
vicara 0:8c76e25a3cff 1 /* mbed Microcontroller Library
vicara 0:8c76e25a3cff 2 * Copyright (c) 2006-2015 ARM Limited
vicara 0:8c76e25a3cff 3 *
vicara 0:8c76e25a3cff 4 * Licensed under the Apache License, Version 2.0 (the "License");
vicara 0:8c76e25a3cff 5 * you may not use this file except in compliance with the License.
vicara 0:8c76e25a3cff 6 * You may obtain a copy of the License at
vicara 0:8c76e25a3cff 7 *
vicara 0:8c76e25a3cff 8 * http://www.apache.org/licenses/LICENSE-2.0
vicara 0:8c76e25a3cff 9 *
vicara 0:8c76e25a3cff 10 * Unless required by applicable law or agreed to in writing, software
vicara 0:8c76e25a3cff 11 * distributed under the License is distributed on an "AS IS" BASIS,
vicara 0:8c76e25a3cff 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
vicara 0:8c76e25a3cff 13 * See the License for the specific language governing permissions and
vicara 0:8c76e25a3cff 14 * limitations under the License.
vicara 0:8c76e25a3cff 15 */
vicara 0:8c76e25a3cff 16
vicara 0:8c76e25a3cff 17 #include <events/mbed_events.h>
vicara 0:8c76e25a3cff 18 #include <mbed.h>
vicara 0:8c76e25a3cff 19 #include "ble/BLE.h"
vicara 0:8c76e25a3cff 20 #include "ble/DiscoveredCharacteristic.h"
vicara 0:8c76e25a3cff 21 #include "ble/DiscoveredService.h"
vicara 0:8c76e25a3cff 22
vicara 0:8c76e25a3cff 23 DigitalOut alivenessLED(LED1, 1);
vicara 0:8c76e25a3cff 24 static DiscoveredCharacteristic ledCharacteristic;
vicara 0:8c76e25a3cff 25 static bool triggerLedCharacteristic;
vicara 0:8c76e25a3cff 26 static const char PEER_NAME[] = "LED_RED";
vicara 0:8c76e25a3cff 27 InterruptIn button(USER_BUTTON);
vicara 0:8c76e25a3cff 28 static uint8_t toggledValue = 0x0;
vicara 0:8c76e25a3cff 29
vicara 0:8c76e25a3cff 30 static EventQueue eventQueue(/* event count */ 16 * EVENTS_EVENT_SIZE);
vicara 0:8c76e25a3cff 31
vicara 0:8c76e25a3cff 32 void periodicCallback(void) {
vicara 0:8c76e25a3cff 33 alivenessLED = !alivenessLED; /* Do blinky on LED1 while we're waiting for BLE events */
vicara 0:8c76e25a3cff 34 }
vicara 0:8c76e25a3cff 35
vicara 0:8c76e25a3cff 36 void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params) {
vicara 0:8c76e25a3cff 37 // parse the advertising payload, looking for data type COMPLETE_LOCAL_NAME
vicara 0:8c76e25a3cff 38 // The advertising payload is a collection of key/value records where
vicara 0:8c76e25a3cff 39 // byte 0: length of the record excluding this byte
vicara 0:8c76e25a3cff 40 // byte 1: The key, it is the type of the data
vicara 0:8c76e25a3cff 41 // byte [2..N] The value. N is equal to byte0 - 1
vicara 0:8c76e25a3cff 42 for (uint8_t i = 0; i < params->advertisingDataLen; ++i) {
vicara 0:8c76e25a3cff 43
vicara 0:8c76e25a3cff 44 const uint8_t record_length = params->advertisingData[i];
vicara 0:8c76e25a3cff 45 if (record_length == 0) {
vicara 0:8c76e25a3cff 46 continue;
vicara 0:8c76e25a3cff 47 }
vicara 0:8c76e25a3cff 48 const uint8_t type = params->advertisingData[i + 1];
vicara 0:8c76e25a3cff 49 const uint8_t* value = params->advertisingData + i + 2;
vicara 0:8c76e25a3cff 50 const uint8_t value_length = record_length - 1;
vicara 0:8c76e25a3cff 51
vicara 0:8c76e25a3cff 52 if(type == GapAdvertisingData::COMPLETE_LOCAL_NAME) {
vicara 0:8c76e25a3cff 53 if ((value_length == sizeof(PEER_NAME)) && (memcmp(value, PEER_NAME, value_length) == 0)) {
vicara 0:8c76e25a3cff 54 printf(
vicara 0:8c76e25a3cff 55 "adv peerAddr[%02x %02x %02x %02x %02x %02x] rssi %d, isScanResponse %u, AdvertisementType %u\r\n",
vicara 0:8c76e25a3cff 56 params->peerAddr[5], params->peerAddr[4], params->peerAddr[3], params->peerAddr[2],
vicara 0:8c76e25a3cff 57 params->peerAddr[1], params->peerAddr[0], params->rssi, params->isScanResponse, params->type
vicara 0:8c76e25a3cff 58 );
vicara 0:8c76e25a3cff 59 BLE::Instance().gap().connect(params->peerAddr, Gap::ADDR_TYPE_RANDOM_STATIC, NULL, NULL);
vicara 0:8c76e25a3cff 60 break;
vicara 0:8c76e25a3cff 61 }
vicara 0:8c76e25a3cff 62 }
vicara 0:8c76e25a3cff 63 i += record_length;
vicara 0:8c76e25a3cff 64 }
vicara 0:8c76e25a3cff 65 }
vicara 0:8c76e25a3cff 66
vicara 0:8c76e25a3cff 67 void serviceDiscoveryCallback(const DiscoveredService *service) {
vicara 0:8c76e25a3cff 68 if (service->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) {
vicara 0:8c76e25a3cff 69 printf("S UUID-%x attrs[%u %u]\r\n", service->getUUID().getShortUUID(), service->getStartHandle(), service->getEndHandle());
vicara 0:8c76e25a3cff 70 } else {
vicara 0:8c76e25a3cff 71 printf("S UUID-");
vicara 0:8c76e25a3cff 72 const uint8_t *longUUIDBytes = service->getUUID().getBaseUUID();
vicara 0:8c76e25a3cff 73 for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
vicara 0:8c76e25a3cff 74 printf("%02x", longUUIDBytes[i]);
vicara 0:8c76e25a3cff 75 }
vicara 0:8c76e25a3cff 76 printf(" attrs[%u %u]\r\n", service->getStartHandle(), service->getEndHandle());
vicara 0:8c76e25a3cff 77 }
vicara 0:8c76e25a3cff 78 }
vicara 0:8c76e25a3cff 79
vicara 0:8c76e25a3cff 80 void updateLedCharacteristic(void) {
vicara 0:8c76e25a3cff 81 if (!BLE::Instance().gattClient().isServiceDiscoveryActive()) {
vicara 0:8c76e25a3cff 82 ledCharacteristic.read();
vicara 0:8c76e25a3cff 83 }
vicara 0:8c76e25a3cff 84 }
vicara 0:8c76e25a3cff 85
vicara 0:8c76e25a3cff 86 void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) {
vicara 0:8c76e25a3cff 87 printf(" C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getUUID().getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast());
vicara 0:8c76e25a3cff 88 if (characteristicP->getUUID().getShortUUID() == 0xa001) { /* !ALERT! Alter this filter to suit your device. */
vicara 0:8c76e25a3cff 89 ledCharacteristic = *characteristicP;
vicara 0:8c76e25a3cff 90 triggerLedCharacteristic = true;
vicara 0:8c76e25a3cff 91 }
vicara 0:8c76e25a3cff 92 }
vicara 0:8c76e25a3cff 93
vicara 0:8c76e25a3cff 94 void discoveryTerminationCallback(Gap::Handle_t connectionHandle) {
vicara 0:8c76e25a3cff 95 printf("terminated SD for handle %u\r\n", connectionHandle);
vicara 0:8c76e25a3cff 96 if (triggerLedCharacteristic) {
vicara 0:8c76e25a3cff 97 triggerLedCharacteristic = false;
vicara 0:8c76e25a3cff 98 eventQueue.call(updateLedCharacteristic);
vicara 0:8c76e25a3cff 99 }
vicara 0:8c76e25a3cff 100 }
vicara 0:8c76e25a3cff 101
vicara 0:8c76e25a3cff 102 void connectionCallback(const Gap::ConnectionCallbackParams_t *params) {
vicara 0:8c76e25a3cff 103 if (params->role == Gap::CENTRAL) {
vicara 0:8c76e25a3cff 104 BLE &ble = BLE::Instance();
vicara 0:8c76e25a3cff 105 ble.gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback);
vicara 0:8c76e25a3cff 106 ble.gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback, 0xa000, 0xa001);
vicara 0:8c76e25a3cff 107 }
vicara 0:8c76e25a3cff 108 }
vicara 0:8c76e25a3cff 109
vicara 0:8c76e25a3cff 110 void triggerToggledWrite(const GattReadCallbackParams *response) {
vicara 0:8c76e25a3cff 111 if (response->handle == ledCharacteristic.getValueHandle()) {
vicara 0:8c76e25a3cff 112 printf("triggerToggledWrite: handle %u, offset %u, len %u\r\n", response->handle, response->offset, response->len);
vicara 0:8c76e25a3cff 113 for (unsigned index = 0; index < response->len; index++) {
vicara 0:8c76e25a3cff 114 printf("%c[%02x]", response->data[index], response->data[index]);
vicara 0:8c76e25a3cff 115 }
vicara 0:8c76e25a3cff 116 printf("\r\n");
vicara 0:8c76e25a3cff 117
vicara 0:8c76e25a3cff 118 ledCharacteristic.write(1, &toggledValue);
vicara 0:8c76e25a3cff 119 }
vicara 0:8c76e25a3cff 120 }
vicara 0:8c76e25a3cff 121
vicara 0:8c76e25a3cff 122 void triggerRead(const GattWriteCallbackParams *response) {
vicara 0:8c76e25a3cff 123 if (response->handle == ledCharacteristic.getValueHandle()) {
vicara 0:8c76e25a3cff 124 ledCharacteristic.read();
vicara 0:8c76e25a3cff 125 }
vicara 0:8c76e25a3cff 126 }
vicara 0:8c76e25a3cff 127
vicara 0:8c76e25a3cff 128 void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *) {
vicara 0:8c76e25a3cff 129 printf("disconnected\r\n");
vicara 0:8c76e25a3cff 130 /* Start scanning and try to connect again */
vicara 0:8c76e25a3cff 131 BLE::Instance().gap().startScan(advertisementCallback);
vicara 0:8c76e25a3cff 132 }
vicara 0:8c76e25a3cff 133
vicara 0:8c76e25a3cff 134 void onBleInitError(BLE &ble, ble_error_t error)
vicara 0:8c76e25a3cff 135 {
vicara 0:8c76e25a3cff 136 /* Initialization error handling should go here */
vicara 0:8c76e25a3cff 137 }
vicara 0:8c76e25a3cff 138
vicara 0:8c76e25a3cff 139 void printMacAddress()
vicara 0:8c76e25a3cff 140 {
vicara 0:8c76e25a3cff 141 /* Print out device MAC address to the console*/
vicara 0:8c76e25a3cff 142 Gap::AddressType_t addr_type;
vicara 0:8c76e25a3cff 143 Gap::Address_t address;
vicara 0:8c76e25a3cff 144 BLE::Instance().gap().getAddress(&addr_type, address);
vicara 0:8c76e25a3cff 145 printf("DEVICE MAC ADDRESS: ");
vicara 0:8c76e25a3cff 146 for (int i = 5; i >= 1; i--){
vicara 0:8c76e25a3cff 147 printf("%02x:", address[i]);
vicara 0:8c76e25a3cff 148 }
vicara 0:8c76e25a3cff 149 printf("%02x\r\n", address[0]);
vicara 0:8c76e25a3cff 150 }
vicara 0:8c76e25a3cff 151
vicara 0:8c76e25a3cff 152 void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
vicara 0:8c76e25a3cff 153 {
vicara 0:8c76e25a3cff 154 BLE& ble = params->ble;
vicara 0:8c76e25a3cff 155 ble_error_t error = params->error;
vicara 0:8c76e25a3cff 156
vicara 0:8c76e25a3cff 157 if (error != BLE_ERROR_NONE) {
vicara 0:8c76e25a3cff 158 /* In case of error, forward the error handling to onBleInitError */
vicara 0:8c76e25a3cff 159 onBleInitError(ble, error);
vicara 0:8c76e25a3cff 160 return;
vicara 0:8c76e25a3cff 161 }
vicara 0:8c76e25a3cff 162
vicara 0:8c76e25a3cff 163 /* Ensure that it is the default instance of BLE */
vicara 0:8c76e25a3cff 164 if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
vicara 0:8c76e25a3cff 165 return;
vicara 0:8c76e25a3cff 166 }
vicara 0:8c76e25a3cff 167
vicara 0:8c76e25a3cff 168 ble.gap().onDisconnection(disconnectionCallback);
vicara 0:8c76e25a3cff 169 ble.gap().onConnection(connectionCallback);
vicara 0:8c76e25a3cff 170
vicara 0:8c76e25a3cff 171 ble.gattClient().onDataRead(triggerToggledWrite);
vicara 0:8c76e25a3cff 172 ble.gattClient().onDataWrite(triggerRead);
vicara 0:8c76e25a3cff 173
vicara 0:8c76e25a3cff 174 // scan interval: 400ms and scan window: 400ms.
vicara 0:8c76e25a3cff 175 // Every 400ms the device will scan for 400ms
vicara 0:8c76e25a3cff 176 // This means that the device will scan continuously.
vicara 0:8c76e25a3cff 177 ble.gap().setScanParams(400, 400);
vicara 0:8c76e25a3cff 178 ble.gap().startScan(advertisementCallback);
vicara 0:8c76e25a3cff 179
vicara 0:8c76e25a3cff 180 printMacAddress();
vicara 0:8c76e25a3cff 181 }
vicara 0:8c76e25a3cff 182
vicara 0:8c76e25a3cff 183 void scheduleBleEventsProcessing(BLE::OnEventsToProcessCallbackContext* context) {
vicara 0:8c76e25a3cff 184 BLE &ble = BLE::Instance();
vicara 0:8c76e25a3cff 185 eventQueue.call(Callback<void()>(&ble, &BLE::processEvents));
vicara 0:8c76e25a3cff 186 }
vicara 0:8c76e25a3cff 187
vicara 0:8c76e25a3cff 188 void btn_on (){
vicara 0:8c76e25a3cff 189 toggledValue = 0x1;
vicara 0:8c76e25a3cff 190 }
vicara 0:8c76e25a3cff 191
vicara 0:8c76e25a3cff 192 void btn_off (){
vicara 0:8c76e25a3cff 193 toggledValue = 0x0;
vicara 0:8c76e25a3cff 194 }
vicara 0:8c76e25a3cff 195
vicara 0:8c76e25a3cff 196 int main()
vicara 0:8c76e25a3cff 197 {
vicara 0:8c76e25a3cff 198 triggerLedCharacteristic = false;
vicara 0:8c76e25a3cff 199 eventQueue.call_every(500, periodicCallback);
vicara 0:8c76e25a3cff 200
vicara 0:8c76e25a3cff 201 button.fall(&btn_on);
vicara 0:8c76e25a3cff 202 button.rise(&btn_off);
vicara 0:8c76e25a3cff 203
vicara 0:8c76e25a3cff 204 BLE &ble = BLE::Instance();
vicara 0:8c76e25a3cff 205 ble.onEventsToProcess(scheduleBleEventsProcessing);
vicara 0:8c76e25a3cff 206 ble.init(bleInitComplete);
vicara 0:8c76e25a3cff 207
vicara 0:8c76e25a3cff 208 eventQueue.dispatch_forever();
vicara 0:8c76e25a3cff 209
vicara 0:8c76e25a3cff 210 return 0;
vicara 0:8c76e25a3cff 211 }