Diff: MicroBitAccelerometerService.cpp

Revision:

77:d0c01a3d966f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MicroBitAccelerometerService.cpp	Mon Nov 30 13:37:37 2015 +0000
@@ -0,0 +1,76 @@
+/**
+  * Class definition for the custom MicroBit Accelerometer Service.
+  * Provides a BLE service to remotely read the state of the accelerometer, and configure its behaviour.
+  */
+  
+#include "mbed.h"
+#include "ble/BLE.h"
+#include "ble/UUID.h"
+#include "MicroBitAccelerometerService.h"
+
+GattAttribute::Handle_t accelerometerDataCharacteristicHandleGlobal;
+
+/**
+  * Constructor. 
+  * Create a representation of the AccelerometerService
+  * @param _ble The instance of a BLE device that we're running on.
+  */
+MicroBitAccelerometerService::MicroBitAccelerometerService(BLEDevice &_ble) : 
+        ble(_ble) 
+{
+    // Create the data structures that represent each of our characteristics in Soft Device.
+    GattCharacteristic *accelerometerDataCharacteristic = new GattCharacteristic(MicroBitAccelerometerServiceDataUUID, (uint8_t *)accelerometerDataCharacteristicBuffer, 0, 
+    sizeof(accelerometerDataCharacteristicBuffer), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
+
+    GattCharacteristic  *accelerometerPeriodCharacteristic = new GattCharacteristic(MicroBitAccelerometerServicePeriodUUID, (uint8_t *)&accelerometerPeriodCharacteristicBuffer, 0, 
+    sizeof(accelerometerPeriodCharacteristicBuffer), 
+    GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE);
+
+    // Initialise our characteristic values.
+    accelerometerDataCharacteristicBuffer[0] = 0;
+    accelerometerDataCharacteristicBuffer[1] = 0;
+    accelerometerDataCharacteristicBuffer[2] = 0;
+    accelerometerPeriodCharacteristicBuffer = 0;
+
+    // Set default security requirements
+    accelerometerDataCharacteristic->requireSecurity(SecurityManager::SECURITY_MODE_ENCRYPTION_WITH_MITM);
+    accelerometerPeriodCharacteristic->requireSecurity(SecurityManager::SECURITY_MODE_ENCRYPTION_WITH_MITM);
+
+    GattCharacteristic *characteristics[] = {accelerometerDataCharacteristic, accelerometerPeriodCharacteristic};
+    GattService         service(MicroBitAccelerometerServiceUUID, characteristics, sizeof(characteristics) / sizeof(GattCharacteristic *));
+
+    ble.addService(service);
+
+    accelerometerDataCharacteristicHandle = accelerometerDataCharacteristic->getValueHandle();
+    accelerometerDataCharacteristicHandleGlobal = accelerometerDataCharacteristic->getValueHandle();
+    accelerometerPeriodCharacteristicHandle = accelerometerPeriodCharacteristic->getValueHandle();
+
+    ble.gattServer().write(accelerometerDataCharacteristicHandle,(uint8_t *)accelerometerDataCharacteristicBuffer, sizeof(accelerometerDataCharacteristicBuffer));
+    ble.gattServer().write(accelerometerPeriodCharacteristicHandle, (const uint8_t *)&accelerometerPeriodCharacteristicBuffer, sizeof(accelerometerPeriodCharacteristicBuffer));
+
+    ble.onDataWritten(this, &MicroBitAccelerometerService::onDataWritten);
+}
+
+/**
+  * Callback. Invoked when any of our attributes are written via BLE.
+  */
+void MicroBitAccelerometerService::onDataWritten(const GattWriteCallbackParams *params)
+{   
+    if (params->handle == accelerometerPeriodCharacteristicHandle && params->len >= sizeof(accelerometerPeriodCharacteristicBuffer))
+    {
+        accelerometerPeriodCharacteristicBuffer = *((uint16_t *)params->data);
+    }
+}
+
+const uint8_t  MicroBitAccelerometerServiceUUID[] = {
+    0xe9,0x5d,0x07,0x53,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};
+
+const uint8_t  MicroBitAccelerometerServiceDataUUID[] = {
+    0xe9,0x5d,0xca,0x4b,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};
+
+const uint8_t  MicroBitAccelerometerServicePeriodUUID[] = {
+    0xe9,0x5d,0xfb,0x24,0x25,0x1d,0x47,0x0a,0xa0,0x62,0xfa,0x19,0x22,0xdf,0xa9,0xa8
+};
+