Diff: source/main.cpp

Revision:

0:8c76e25a3cff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/main.cpp	Thu Nov 29 18:32:03 2018 +0000
@@ -0,0 +1,211 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2015 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <events/mbed_events.h>
+#include <mbed.h>
+#include "ble/BLE.h"
+#include "ble/DiscoveredCharacteristic.h"
+#include "ble/DiscoveredService.h"
+
+DigitalOut alivenessLED(LED1, 1);
+static DiscoveredCharacteristic ledCharacteristic;
+static bool triggerLedCharacteristic;
+static const char PEER_NAME[] = "LED_RED";
+InterruptIn button(USER_BUTTON);
+static uint8_t toggledValue = 0x0;
+
+static EventQueue eventQueue(/* event count */ 16 * EVENTS_EVENT_SIZE);
+
+void periodicCallback(void) {
+    alivenessLED = !alivenessLED; /* Do blinky on LED1 while we're waiting for BLE events */
+}
+
+void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params) {
+    // parse the advertising payload, looking for data type COMPLETE_LOCAL_NAME
+    // The advertising payload is a collection of key/value records where
+    // byte 0: length of the record excluding this byte
+    // byte 1: The key, it is the type of the data
+    // byte [2..N] The value. N is equal to byte0 - 1
+    for (uint8_t i = 0; i < params->advertisingDataLen; ++i) {
+
+        const uint8_t record_length = params->advertisingData[i];
+        if (record_length == 0) {
+            continue;
+        }
+        const uint8_t type = params->advertisingData[i + 1];
+        const uint8_t* value = params->advertisingData + i + 2;
+        const uint8_t value_length = record_length - 1;
+
+        if(type == GapAdvertisingData::COMPLETE_LOCAL_NAME) {
+            if ((value_length == sizeof(PEER_NAME)) && (memcmp(value, PEER_NAME, value_length) == 0)) {
+                printf(
+                    "adv peerAddr[%02x %02x %02x %02x %02x %02x] rssi %d, isScanResponse %u, AdvertisementType %u\r\n",
+                    params->peerAddr[5], params->peerAddr[4], params->peerAddr[3], params->peerAddr[2],
+                    params->peerAddr[1], params->peerAddr[0], params->rssi, params->isScanResponse, params->type
+                );
+                BLE::Instance().gap().connect(params->peerAddr, Gap::ADDR_TYPE_RANDOM_STATIC, NULL, NULL);
+                break;
+            }
+        }
+        i += record_length;
+    }
+}
+
+void serviceDiscoveryCallback(const DiscoveredService *service) {
+    if (service->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) {
+        printf("S UUID-%x attrs[%u %u]\r\n", service->getUUID().getShortUUID(), service->getStartHandle(), service->getEndHandle());
+    } else {
+        printf("S UUID-");
+        const uint8_t *longUUIDBytes = service->getUUID().getBaseUUID();
+        for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
+            printf("%02x", longUUIDBytes[i]);
+        }
+        printf(" attrs[%u %u]\r\n", service->getStartHandle(), service->getEndHandle());
+    }
+}
+
+void updateLedCharacteristic(void) {
+    if (!BLE::Instance().gattClient().isServiceDiscoveryActive()) {
+        ledCharacteristic.read();
+    }
+}
+
+void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) {
+    printf("  C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getUUID().getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast());
+    if (characteristicP->getUUID().getShortUUID() == 0xa001) { /* !ALERT! Alter this filter to suit your device. */
+        ledCharacteristic        = *characteristicP;
+        triggerLedCharacteristic = true;
+    }
+}
+
+void discoveryTerminationCallback(Gap::Handle_t connectionHandle) {
+    printf("terminated SD for handle %u\r\n", connectionHandle);
+    if (triggerLedCharacteristic) {
+        triggerLedCharacteristic = false;
+        eventQueue.call(updateLedCharacteristic);
+    }
+}
+
+void connectionCallback(const Gap::ConnectionCallbackParams_t *params) {
+    if (params->role == Gap::CENTRAL) {
+        BLE &ble = BLE::Instance();
+        ble.gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback);
+        ble.gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback, 0xa000, 0xa001);
+    }
+}
+
+void triggerToggledWrite(const GattReadCallbackParams *response) {
+    if (response->handle == ledCharacteristic.getValueHandle()) {
+        printf("triggerToggledWrite: handle %u, offset %u, len %u\r\n", response->handle, response->offset, response->len);
+        for (unsigned index = 0; index < response->len; index++) {
+            printf("%c[%02x]", response->data[index], response->data[index]);
+        }
+        printf("\r\n");
+
+        ledCharacteristic.write(1, &toggledValue);
+    }
+}
+
+void triggerRead(const GattWriteCallbackParams *response) {
+    if (response->handle == ledCharacteristic.getValueHandle()) {
+        ledCharacteristic.read();
+    }
+}
+
+void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *) {
+    printf("disconnected\r\n");
+    /* Start scanning and try to connect again */
+    BLE::Instance().gap().startScan(advertisementCallback);
+}
+
+void onBleInitError(BLE &ble, ble_error_t error)
+{
+   /* Initialization error handling should go here */
+}
+
+void printMacAddress()
+{
+    /* Print out device MAC address to the console*/
+    Gap::AddressType_t addr_type;
+    Gap::Address_t address;
+    BLE::Instance().gap().getAddress(&addr_type, address);
+    printf("DEVICE MAC ADDRESS: ");
+    for (int i = 5; i >= 1; i--){
+        printf("%02x:", address[i]);
+    }
+    printf("%02x\r\n", address[0]);
+}
+
+void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
+{
+    BLE&        ble   = params->ble;
+    ble_error_t error = params->error;
+
+    if (error != BLE_ERROR_NONE) {
+        /* In case of error, forward the error handling to onBleInitError */
+        onBleInitError(ble, error);
+        return;
+    }
+
+    /* Ensure that it is the default instance of BLE */
+    if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
+        return;
+    }
+
+    ble.gap().onDisconnection(disconnectionCallback);
+    ble.gap().onConnection(connectionCallback);
+    
+    ble.gattClient().onDataRead(triggerToggledWrite);
+    ble.gattClient().onDataWrite(triggerRead);
+
+    // scan interval: 400ms and scan window: 400ms.
+    // Every 400ms the device will scan for 400ms
+    // This means that the device will scan continuously.
+    ble.gap().setScanParams(400, 400);
+    ble.gap().startScan(advertisementCallback);
+
+    printMacAddress();
+}
+
+void scheduleBleEventsProcessing(BLE::OnEventsToProcessCallbackContext* context) {
+    BLE &ble = BLE::Instance();
+    eventQueue.call(Callback<void()>(&ble, &BLE::processEvents));
+}
+
+void btn_on (){
+    toggledValue = 0x1;
+}
+
+void btn_off (){
+    toggledValue = 0x0;
+}
+
+int main()
+{
+    triggerLedCharacteristic = false;
+    eventQueue.call_every(500, periodicCallback);
+    
+    button.fall(&btn_on);
+    button.rise(&btn_off);
+
+    BLE &ble = BLE::Instance();
+    ble.onEventsToProcess(scheduleBleEventsProcessing);
+    ble.init(bleInitComplete);
+
+    eventQueue.dispatch_forever();
+
+    return 0;
+}