microbit: Added first draft of BLE Accelerometer service

n.b. this code is as yet untested.
master
Joe Finney 7 years ago
parent 9ccf0a7688
commit 609cb6f2d8
  1. 48
      inc/MicroBitAccelerometerService.h
  2. 1
      source/CMakeLists.txt
  3. 73
      source/ble-services/MicroBitAccelerometerService.cpp

@ -0,0 +1,48 @@
#ifndef MICROBIT_ACCELEROMETER_SERVICE_H
#define MICROBIT_ACCELEROMETER_SERVICE_H
#include "MicroBit.h"
// UUIDs for our service and characteristics
extern const uint8_t MicroBitAccelerometerServiceUUID[];
extern const uint8_t MicroBitAccelerometerServiceDataUUID[];
extern const uint8_t MicroBitAccelerometerServicePeriodUUID[];
/**
* Class definition for a MicroBit BLE Accelerometer Service.
* Provides access to live accelerometer data via BLE, and provides basic configuration options.
*/
class MicroBitAccelerometerService
{
public:
/**
* Constructor.
* Create a representation of the AccelerometerService
* @param _ble The instance of a BLE device that we're running on.
*/
MicroBitAccelerometerService(BLEDevice &_ble);
/**
* Callback. Invoked when any of our attributes are written via BLE.
*/
void onDataWritten(const GattWriteCallbackParams *params);
private:
// Bluetooth stack we're running on.
BLEDevice &ble;
// memory for our 8 bit control characteristics.
uint16_t accelerometerDataCharacteristicBuffer[3];
uint8_t accelerometerPeriodCharacteristicBuffer;
// Handles to access each characteristic when they are held by Soft Device.
GattAttribute::Handle_t accelerometerDataCharacteristicHandle;
GattAttribute::Handle_t accelerometerPeriodCharacteristicHandle;
};
#endif

@ -29,6 +29,7 @@ set(YOTTA_AUTO_MICROBIT-DAL_CPP_FILES
"ble-services/MicroBitDFUService.cpp"
"ble-services/MicroBitEventService.cpp"
"ble-services/MicroBitLEDService.cpp"
"ble-services/MicroBitAccelerometerService.cpp"
)
if (YOTTA_CFG_MICROBIT_CONFIGFILE)

@ -0,0 +1,73 @@
/**
* 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 "MicroBit.h"
#include "ble/UUID.h"
#include "MicroBitAccelerometerService.h"
/**
* 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(MicroBitAccelerometerServiceDataUUID, (uint8_t *)accelerometerDataCharacteristicBuffer, 0,
sizeof(accelerometerDataCharacteristicBuffer), GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY);
GattCharacteristic accelerometerPeriodCharacteristic(MicroBitAccelerometerServicePeriodUUID, (uint8_t *)accelerometerPeriodCharacteristicBuffer, 0,
sizeof(accelerometerPeriodCharacteristicBuffer),
GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_READ | GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_WRITE_WITHOUT_RESPONSE);
// Initialise our characteristic values.
accelerometerDataCharacteristicBuffer[0] = 0;
accelerometerDataCharacteristicBuffer[1] = 0;
accelerometerDataCharacteristicBuffer[2] = 0;
accelerometerPeriodCharacteristicBuffer = 0;
GattCharacteristic *characteristics[] = {&accelerometerDataCharacteristic, &accelerometerPeriodCharacteristic};
GattService service(MicroBitAccelerometerServiceUUID, characteristics, sizeof(characteristics) / sizeof(GattCharacteristic *));
ble.addService(service);
accelerometerDataCharacteristicHandle = accelerometerDataCharacteristic.getValueHandle();
accelerometerPeriodCharacteristicHandle = accelerometerPeriodCharacteristic.getValueHandle();
ble.updateCharacteristicValue(accelerometerDataCharacteristicHandle, (const uint8_t *)&accelerometerDataCharacteristicBuffer, sizeof(accelerometerDataCharacteristicBuffer));
ble.updateCharacteristicValue(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 = *((uint8_t *)params->data);
uBit.accelerometer.setPeriod(accelerometerPeriodCharacteristicBuffer);
}
}
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
};
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