Revision 11:5e43f35f64a8, committed 2016-04-29

Comitter:

janjongboom

Date:

Fri Apr 29 11:44:02 2016 +0000

Parent:

10:af76616e4d75

Child:

12:7eebfdfdd892

Commit message:

BLE Workshop, LED and Button service

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ButtonService.h	Fri Apr 29 11:44:02 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_BUTTON_SERVICE_H__
+#define __BLE_BUTTON_SERVICE_H__
+ 
+class ButtonService {
+public:
+    const static uint16_t BUTTON_SERVICE_UUID              = 0xA010;
+    const static uint16_t BUTTON_STATE_CHARACTERISTIC_UUID = 0xA011;
+ 
+    ButtonService(BLE &_ble, bool buttonPressedInitial) :
+        ble(_ble), buttonState(BUTTON_STATE_CHARACTERISTIC_UUID, &buttonPressedInitial, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY)
+    {
+        GattCharacteristic *charTable[] = {&buttonState};
+        GattService         buttonService(ButtonService::BUTTON_SERVICE_UUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
+        ble.gattServer().addService(buttonService);
+    }
+ 
+    void updateButtonState(bool newState) {
+        ble.gattServer().write(buttonState.getValueHandle(), (uint8_t *)&newState, sizeof(bool));
+    }
+ 
+private:
+    BLE                              &ble;
+    ReadOnlyGattCharacteristic<bool>  buttonState;
+};
+ 
+#endif /* #ifndef __BLE_BUTTON_SERVICE_H__ */
+ 
\ No newline at end of file

--- a/main.cpp	Tue Jan 12 10:34:34 2016 +0000
+++ b/main.cpp	Fri Apr 29 11:44:02 2016 +0000
@@ -17,25 +17,44 @@
 #include "mbed.h"
 #include "ble/BLE.h"
 #include "LEDService.h"
+#include "ButtonService.h"
 
-DigitalOut alivenessLED(LED1, 0);
-DigitalOut actuatedLED(LED2, 0);
+#define LED_ON          0
+#define LED_OFF         1
 
-const static char     DEVICE_NAME[] = "LED";
-static const uint16_t uuid16_list[] = {LEDService::LED_SERVICE_UUID};
+DigitalOut alivenessLED(LED1, LED_OFF); // green
+DigitalOut actuatedLED(LED2, LED_OFF);  // red
+InterruptIn button(BUTTON1);
+
+const static char     DEVICE_NAME[] = "MY_BLE_DEVICE";
+static const uint16_t uuid16_list[] = { 
+    LEDService::LED_SERVICE_UUID, 
+    ButtonService::BUTTON_SERVICE_UUID
+};
 
 LEDService *ledServicePtr;
+ButtonService *buttonServicePtr;
 
 Ticker ticker;
 
+void periodicCallback(void)
+{
+    alivenessLED = !alivenessLED; /* Do blinky on LED1 to indicate system aliveness. */
+}
+
 void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params)
 {
     BLE::Instance().gap().startAdvertising();
+    
+    ticker.attach(periodicCallback, 1);
 }
 
-void periodicCallback(void)
+void connectionCallback(const Gap::ConnectionCallbackParams_t * params)
 {
-    alivenessLED = !alivenessLED; /* Do blinky on LED1 to indicate system aliveness. */
+    // stop blinking when we connect
+    ticker.detach();
+    // also put the led off
+    alivenessLED = LED_OFF;
 }
 
 /**
@@ -45,8 +64,12 @@
  *     Information about the characterisitc being updated.
  */
 void onDataWrittenCallback(const GattWriteCallbackParams *params) {
+    // handle corresponds to the characteristic being written
+    // then we can read data to get a buffer of the actual data
     if ((params->handle == ledServicePtr->getValueHandle()) && (params->len == 1)) {
-        actuatedLED = *(params->data);
+        // When writing 1 -> turn LED on, 0 -> turn LED off
+        char val = params->data[0];
+        actuatedLED = val == 1 ? LED_ON : LED_OFF;
     }
 }
 
@@ -55,7 +78,8 @@
  */
 void onBleInitError(BLE &ble, ble_error_t error)
 {
-    /* Initialization error handling should go here */
+    // blink fast when we encountered an error
+    ticker.attach(periodicCallback, 0.2);
 }
 
 /**
@@ -78,12 +102,14 @@
     }
  
     ble.gap().onDisconnection(disconnectionCallback);
+    ble.gap().onConnection(connectionCallback);
     ble.gattServer().onDataWritten(onDataWrittenCallback);
 
-    bool initialValueForLEDCharacteristic = false;
-    ledServicePtr = new LEDService(ble, initialValueForLEDCharacteristic);
+    // Begin - If you add a new service, add it here!
+    ledServicePtr = new LEDService(ble, false /* inital value */);
+    buttonServicePtr = new ButtonService(ble, false /* initial value */);
+    // End - If you add a new service, add it here!
 
-    /* setup advertising */
     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));
@@ -92,10 +118,23 @@
     ble.gap().startAdvertising();
 }
 
+void button_down() {
+    if (!buttonServicePtr) return;
+    buttonServicePtr->updateButtonState(true);
+}
+void button_up() {
+    if (!buttonServicePtr) return;
+    buttonServicePtr->updateButtonState(false);
+}
+
 int main(void)
 {
-    ticker.attach(periodicCallback, 1); /* Blink LED every second */
-
+    // Blink the green LED!
+    ticker.attach(periodicCallback, 1);
+    
+    button.fall(&button_down);
+    button.rise(&button_up);
+    
     BLE &ble = BLE::Instance();
     ble.init(bleInitComplete);