Revision 0:470a1164da56, committed 2016-05-09

Comitter:

janjongboom

Date:

Mon May 09 10:26:40 2016 +0000

Commit message:

HCSR04 ultrasonic sensor over BLE

Changed in this revision

diff -r 000000000000 -r 470a1164da56 BLE_API.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BLE_API.lib	Mon May 09 10:26:40 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/teams/Bluetooth-Low-Energy/code/BLE_API/#66159681aa21

diff -r 000000000000 -r 470a1164da56 HCSR04.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HCSR04.lib	Mon May 09 10:26:40 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/prabhuvd/code/HCSR04/#71da0dbf4400

diff -r 000000000000 -r 470a1164da56 UltrasonicService.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/UltrasonicService.h	Mon May 09 10:26:40 2016 +0000
@@ -0,0 +1,43 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 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.
+ */
+ 
+#ifndef __BLE_ULTRA_SERVICE_H__
+#define __BLE_ULTRA_SERVICE_H__
+ 
+class UltrasonicService {
+public:
+    const static uint16_t SERVICE_UUID              = 0xA998;
+    const static uint16_t STATE_CHARACTERISTIC_UUID = 0xA999;
+ 
+    UltrasonicService(BLE &_ble) :
+        ble(_ble), state(STATE_CHARACTERISTIC_UUID, 0, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY)
+    {
+        GattCharacteristic *charTable[] = {&state};
+        GattService         service(UltrasonicService::SERVICE_UUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
+        ble.gattServer().addService(service);
+    }
+ 
+    void updateState(uint32_t newState) {
+        ble.gattServer().write(state.getValueHandle(), (uint8_t *)&newState, sizeof(uint32_t));
+    }
+ 
+private:
+    BLE                                     &ble;
+    ReadOnlyGattCharacteristic<uint32_t>    state;
+};
+ 
+#endif /* #ifndef __BLE_ULTRA_SERVICE_H__ */
+ 
\ No newline at end of file

diff -r 000000000000 -r 470a1164da56 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon May 09 10:26:40 2016 +0000
@@ -0,0 +1,119 @@
+#include "mbed.h"
+#include "ble/BLE.h"
+#include "UltrasonicService.h"
+#include "hcsr04.h"
+
+#define ULTRASONIC_UPDATE_INTERVAL          1.0f        // in seconds
+
+#define LED_ON          0
+#define LED_OFF         1
+
+static DigitalOut alivenessLED(LED1, LED_OFF); // green
+static HCSR04 usensor(D0, D1);
+
+const static char     DEVICE_NAME[] = "HPE_ULTRASONIC";
+static const uint16_t uuid16_list[] = { 
+    UltrasonicService::SERVICE_UUID
+};
+
+static UltrasonicService *uServicePtr;
+
+static Ticker ledTicker;
+static Ticker uTicker;
+static Timeout cbTimeout;
+
+void readDistanceCallback(void)
+{
+    uint32_t dist = usensor.get_dist_cm();
+
+    uServicePtr->updateState(dist);
+    // should add a stop function? usensor.stop();
+}
+    
+
+void readDistance(void)
+{
+    usensor.start();
+    
+    // need to like have it on for for 0.5s
+    cbTimeout.attach(&readDistanceCallback, 0.5f);
+}
+
+void periodicCallback(void)
+{
+    alivenessLED = !alivenessLED; /* Do blinky on LED1 to indicate system aliveness. */
+}
+
+void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
+{
+    printf("Disconnected over BLE!\r\n");
+    
+    BLE::Instance().gap().startAdvertising();
+    
+    ledTicker.attach(periodicCallback, 1);
+    uTicker.detach();
+}
+
+void connectionCallback(const Gap::ConnectionCallbackParams_t * params)
+{
+    printf("Connected over BLE!\r\n");
+    
+    // blink a bit faster when connected
+    ledTicker.attach(periodicCallback, 0.5);
+    
+    // only do ultrasonic readings whenever we're connected over BLE
+    uTicker.attach(readDistance, ULTRASONIC_UPDATE_INTERVAL);
+}
+
+void onBleInitError(BLE &ble, ble_error_t error)
+{
+    // blink fast when we encountered an error
+    ledTicker.attach(periodicCallback, 0.2);
+}
+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);
+
+    // Begin - If you add a new service, add it here!
+    uServicePtr = new UltrasonicService(ble);
+    // End - If you add a new service, add it here!
+
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
+    ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
+    ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
+    ble.gap().setAdvertisingInterval(1000);
+    ble.gap().startAdvertising();
+}
+
+int main(void)
+{
+    // Blink the green LED!
+    ledTicker.attach(periodicCallback, 1);
+    
+    BLE &ble = BLE::Instance();
+    ble.init(bleInitComplete);
+
+    /* SpinWait for initialization to complete. This is necessary because the
+     * BLE object is used in the main loop below. */
+    while (ble.hasInitialized()  == false) { /* spin loop */ }
+
+    while (true) {
+        ble.waitForEvent();
+    }
+}

diff -r 000000000000 -r 470a1164da56 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Mon May 09 10:26:40 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/aae6fcc7d9bb
\ No newline at end of file

diff -r 000000000000 -r 470a1164da56 nRF51822.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nRF51822.lib	Mon May 09 10:26:40 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/teams/Nordic-Semiconductor/code/nRF51822/#f7faad332abc