extend
Fork of BLE_API by
Diff: source/BLE.cpp
- Revision:
- 809:18a6423afee6
- Parent:
- 808:f902b7ca06a6
- Child:
- 810:c91bc1f5e035
diff -r f902b7ca06a6 -r 18a6423afee6 source/BLE.cpp --- a/source/BLE.cpp Tue Sep 29 09:47:52 2015 +0100 +++ b/source/BLE.cpp Tue Sep 29 09:47:52 2015 +0100 @@ -35,4 +35,77 @@ #endif // TARGET_OTA_ENABLED return BLE_ERROR_NONE; +} + +/** + * BLE::Instance() and BLE constructor rely upon a static array of initializers + * to create actual BLE transport instances. A description of these instances + * and initializers is supposed to be put in some .json file contributing to + * yotta's configuration (typically the target.json). Here's a sample: + * + * "config": { + * ... + * "ble_instances": { + * "count": 1, + * "0" : { + * "initializer" : "createBLEInstance" + * } + * } + * } + * + * The following macros result in translating the above config into a static + * array: instanceConstructors. + */ +#ifdef YOTTA_CFG_BLE_INSTANCES_COUNT +#define CONCATENATE(A, B) A ## B +#define EXPAND(X) X /* this adds a level of indirection needed to allow macro-expansion following a token-paste operation (see use of CONCATENATE() below). */ + +#define INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS_1 YOTTA_CFG_BLE_INSTANCES_0_INITIALIZER +#define INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS_2 INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS_1, YOTTA_CFG_BLE_INSTANCES_1_INITIALIZER +#define INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS_3 INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS_2, YOTTA_CFG_BLE_INSTANCES_2_INITIALIZER +#define INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS_4 INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS_3, YOTTA_CFG_BLE_INSTANCES_3_INITIALIZER +#define INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS_5 INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS_4, YOTTA_CFG_BLE_INSTANCES_4_INITIALIZER +/* ... add more of the above if ever needed */ + +#define INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS(N) EXPAND(CONCATENATE(INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS_, N)) +#endif /* YOTTA_CFG_BLE_INSTANCES_COUNT */ + +typedef BLEInstanceBase *(*InstanceConstructor_t)(void); +static const InstanceConstructor_t instanceConstructors[BLE::NUM_INSTANCES] = { +#ifndef YOTTA_CFG_BLE_INSTANCES_COUNT + createBLEInstance +#else + INITIALIZER_LIST_FOR_INSTANCE_CONSTRUCTORS(YOTTA_CFG_BLE_INSTANCES_COUNT) +#endif +}; + +BLE & +BLE::Instance(InstanceID_t id) +{ + static BLE *singletons[NUM_INSTANCES]; + if (id < NUM_INSTANCES) { + if (singletons[id] == NULL) { + singletons[id] = new BLE(id); /* This object will never be freed. */ + } + + return *singletons[id]; + } + + /* we come here only in the case of a bad interfaceID. */ + static BLE badSingleton(NUM_INSTANCES /* this is a bad index; and will result in a NULL transport. */); + return badSingleton; +} + +BLE::BLE(InstanceID_t instanceID) : transport() +{ + static BLEInstanceBase *transportInstances[NUM_INSTANCES]; + + if (instanceID < NUM_INSTANCES) { + if (!transportInstances[instanceID]) { + transportInstances[instanceID] = instanceConstructors[instanceID](); /* Call the stack's initializer for the transport object. */ + } + transport = transportInstances[instanceID]; + } else { + transport = NULL; + } } \ No newline at end of file