Bluetooth Low Energy
An example of creating and updating a simple GATT Service using the BLE_API
Dependencies: BLE_API mbed nRF51822 X_NUCLEO_IDB0XA1
This example creates and updates a standard Battery Level service, and a single GATT characteristic that contains the battery level.
Revision 17:5afb0e5a48fc, committed 2015-11-03
- Comitter:
- vcoubard
- Date:
- Tue Nov 03 16:03:18 2015 +0000
- Parent:
- 16:5cdd04cf1ed4
- Child:
- 18:8546914968b6
- Commit message:
- Use proper API instead of deprecated ones; Update disconnection callback signature to the correct one; Add the LE_GENERAL_DISCOVERABLE into advertisement FLAGS; Use new BLE::init API of BLE API 2.xx
Changed in this revision
--- a/BLE_API.lib Sat Jun 20 23:22:18 2015 +0000 +++ b/BLE_API.lib Tue Nov 03 16:03:18 2015 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/teams/Bluetooth-Low-Energy/code/BLE_API/#9f4251b3355c +http://mbed.org/teams/Bluetooth-Low-Energy/code/BLE_API/#a097e1be76f4
--- a/main.cpp Sat Jun 20 23:22:18 2015 +0000
+++ b/main.cpp Tue Nov 03 16:03:18 2015 +0000
@@ -18,16 +18,16 @@
#include "BLE.h"
#include "BatteryService.h"
-BLE ble;
-
DigitalOut led1(LED1, 1);
Ticker t;
+BatteryService *batteryService = NULL;
+uint8_t batteryLevel = 50;
-void disconnectionCallback(Gap::Handle_t handle, Gap::DisconnectionReason_t reason)
+void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *disconnectionParams)
{
- printf("Disconnected handle %u!\n\r", handle);
+ printf("Disconnected handle %u!\n\r", disconnectionParams->handle);
printf("Restarting the advertising process\n\r");
- ble.startAdvertising();
+ BLE::Instance(BLE::DEFAULT_INSTANCE).gap().startAdvertising(); // restart advertising
}
void blink(void)
@@ -35,23 +35,39 @@
led1 = !led1;
}
+void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
+{
+ BLE &ble = params->ble;
+ ble_error_t error = params->error;
+ Gap& gap = ble.gap();
+
+ if (error != BLE_ERROR_NONE) {
+ return;
+ }
+
+ gap.onDisconnection(disconnectionCallback);
+
+ batteryService = new BatteryService(ble, batteryLevel);
+
+ /* setup advertising */
+ gap.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
+ gap.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
+ gap.setAdvertisingInterval(1000); /* 1000ms; in multiples of 0.625ms. */
+ gap.startAdvertising();
+}
+
int main(void)
{
- uint8_t batteryLevel = 50;
t.attach(blink, 1.0f);
printf("Initialising the nRF51822\n\r");
- ble.init();
- ble.onDisconnection(disconnectionCallback);
-
- BatteryService batteryService(ble, batteryLevel);
+ BLE& ble = BLE::Instance(BLE::DEFAULT_INSTANCE);
+ ble.init(bleInitComplete);
- /* setup advertising */
- ble.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED);
- ble.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
- ble.setAdvertisingInterval(1000); /* 1000ms; in multiples of 0.625ms. */
- ble.startAdvertising();
+ /* 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(); // this will return upon any system event (such as an interrupt or a ticker wakeup)
@@ -62,6 +78,6 @@
batteryLevel = 20;
}
- batteryService.updateBatteryLevel(batteryLevel);
+ batteryService->updateBatteryLevel(batteryLevel);
}
}
--- a/mbed.bld Sat Jun 20 23:22:18 2015 +0000 +++ b/mbed.bld Tue Nov 03 16:03:18 2015 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/users/mbed_official/code/mbed/builds/7cff1c4259d7 \ No newline at end of file +http://mbed.org/users/mbed_official/code/mbed/builds/9296ab0bfc11 \ No newline at end of file
--- a/nRF51822.lib Sat Jun 20 23:22:18 2015 +0000 +++ b/nRF51822.lib Tue Nov 03 16:03:18 2015 +0000 @@ -1,1 +1,1 @@ -http://mbed.org/teams/Nordic-Semiconductor/code/nRF51822/#7c68c8d67e1f +http://mbed.org/teams/Nordic-Semiconductor/code/nRF51822/#bf85bf7e73d5