Merge pull request #97 from rgrover/develop
BLE::init() should also be able to take an <object, member> tuple for its callback
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commit
8d38842d3d
4 changed files with 66 additions and 25 deletions
62
ble/BLE.h
62
ble/BLE.h
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@ -22,6 +22,8 @@
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#include "GattServer.h"
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#include "GattClient.h"
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#include "ble/FunctionPointerWithContext.h"
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#ifdef YOTTA_CFG_MBED_OS
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#include "mbed-drivers/mbed_error.h"
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#else
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@ -41,16 +43,28 @@ public:
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typedef unsigned InstanceID_t; /** The type returned by BLE::getInstanceID(). */
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/**
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* The function signature for callbacks for initialization completion.
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* The context provided to init-completion-callbacks (see init() below).
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*
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* @param ble
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* A reference to the BLE instance being initialized.
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* @param error
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* This captures the result of initialization. It is set to
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* BLE_ERROR_NONE if initialization completed successfully. Else
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* the error value is implementation specific.
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*
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*/
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typedef void (*InitializationCompleteCallback_t)(BLE &ble, ble_error_t error);
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struct InitializationCompleteCallbackContext {
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BLE& ble; /* Reference to the BLE object which has been initialized */
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ble_error_t error; /* Error status of the initialization. It is set to BLE_ERROR_NONE initialization completed successfully. */
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};
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/**
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* The signature for function-pointer like callbacks for initialization-completion.
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*
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* @note There are two versions of init(). In addition to the simple
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* function-pointer, init() can also take a <Object, member> tuple as its
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* callback target. In case of the latter, the following declaration doesn't apply.
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*/
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typedef void (*InitializationCompleteCallback_t)(InitializationCompleteCallbackContext *context);
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/**
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* Initialize the BLE controller. This should be called before using
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@ -63,7 +77,7 @@ public:
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* context where ordering is compiler specific and can't be guaranteed--it
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* is safe to call BLE::init() from within main().
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*
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* @param callback
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* @param initCompleteCallback
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* A callback for when initialization completes for a BLE
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* instance. This is an optional parameter, if no callback is
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* setup the application can still determine the status of
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@ -72,17 +86,36 @@ public:
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* @return BLE_ERROR_NONE if the initialization procedure was started
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* successfully.
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*
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* @note The underlying stack must invoke the initialization completion
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* callback in response to init(). In some cases, initialization is
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* instantaneous (or blocking); if so, it is acceptable for the stack-
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* specific implementation of init() to invoke the completion callback
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* directly--i.e. within its own context.
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* @note If init() returns BLE_ERROR_NONE, the underlying stack must invoke
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* the initialization completion callback at some point.
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*
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* @note In some cases, initialization is instantaneous (or blocking); if
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* so, it is acceptable for the stack-specific implementation of init()
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* to invoke the completion callback directly--i.e. within its own
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* context.
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*
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* @note Nearly all BLE APIs would return
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* BLE_ERROR_INITIALIZATION_INCOMPLETE if used on an instance before the
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* corresponding transport is initialized.
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*
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* @note There are two versions of init(). In addition to the simple
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* function-pointer, init() can also take an <Object, member> tuple as its
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* callback target.
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*/
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ble_error_t init(InitializationCompleteCallback_t callback = NULL);
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ble_error_t init(InitializationCompleteCallback_t initCompleteCallback = NULL) {
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FunctionPointerWithContext<InitializationCompleteCallbackContext *> callback(initCompleteCallback);
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initImplementation(callback);
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}
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/**
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* An alternate declaration for init(). This one takes an <Object, member> tuple as its
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* callback target.
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*/
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template<typename T>
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ble_error_t init(T *object, void (T::*initCompleteCallback)(InitializationCompleteCallbackContext *context)) {
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FunctionPointerWithContext<InitializationCompleteCallbackContext *> callback(object, initCompleteCallback);
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initImplementation(callback);
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}
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/**
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* @return true if initialization has completed for the underlying BLE
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@ -1387,6 +1420,15 @@ public:
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return securityManager().onPasskeyDisplay(callback);
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}
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private:
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/**
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* Implementation of init() [internal to BLE_API].
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*
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* The implementation is separated into a private method because it isn't
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* suitable to be included in the header.
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*/
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ble_error_t initImplementation(FunctionPointerWithContext<InitializationCompleteCallbackContext *> callback);
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private:
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BLE(const BLE&);
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BLE &operator=(const BLE &);
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@ -32,7 +32,8 @@ class GattClient;
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class BLEInstanceBase
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{
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public:
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virtual ble_error_t init(BLE::InstanceID_t instanceID, BLE::InitializationCompleteCallback_t) = 0;
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virtual ble_error_t init(BLE::InstanceID_t instanceID,
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FunctionPointerWithContext<BLE::InitializationCompleteCallbackContext *> initCallback) = 0;
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virtual bool hasInitialized(void) const = 0;
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virtual ble_error_t shutdown(void) = 0;
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virtual const char * getVersion(void) = 0;
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@ -19,8 +19,6 @@
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#include <string.h>
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/** A class for storing and calling a pointer to a static or member void function
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* which takes a context.
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*/
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@ -107,10 +105,10 @@ private:
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template<typename T>
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static void membercaller(pFunctionPointerWithContext_t self, ContextType context) {
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if (self->_memberFunctionAndPointer._object) {
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T *o = static_cast<T *>(self->_memberFunctionAndPointer._object);
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T *o = static_cast<T *>(self->_memberFunctionAndPointer._object);
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void (T::*m)(ContextType);
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memcpy((char*) &m, self->_memberFunctionAndPointer._memberFunction, sizeof(m));
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(o->*m)(context);
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(o->*m)(context);
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}
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}
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@ -122,9 +120,9 @@ private:
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struct MemberFunctionAndPtr {
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/*
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* forward declaration of a class and a member function to this class.
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* Because the compiler doesn't know anything about the forwarded member
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* function, it will always use the biggest size and the biggest alignment
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* forward declaration of a class and a member function to this class.
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* Because the compiler doesn't know anything about the forwarded member
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* function, it will always use the biggest size and the biggest alignment
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* that a member function can take for objects of type UndefinedMemberFunction.
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*/
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class UndefinedClass;
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@ -133,17 +131,17 @@ private:
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void* _object;
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union {
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char _memberFunction[sizeof(UndefinedMemberFunction)];
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UndefinedMemberFunction _alignment;
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UndefinedMemberFunction _alignment;
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};
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};
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union {
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pvoidfcontext_t _function; /**< static function pointer - NULL if none attached */
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/**
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* object this pointer and pointer to member -
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* _memberFunctionAndPointer._object will be NULL if none attached
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*/
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MemberFunctionAndPtr _memberFunctionAndPointer;
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/**
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* object this pointer and pointer to member -
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* _memberFunctionAndPointer._object will be NULL if none attached
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*/
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MemberFunctionAndPtr _memberFunctionAndPointer;
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};
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void (*_caller)(FunctionPointerWithContext*, ContextType);
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@ -22,7 +22,7 @@
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#endif
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ble_error_t
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BLE::init(BLE::InitializationCompleteCallback_t callback)
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BLE::initImplementation(FunctionPointerWithContext<InitializationCompleteCallbackContext *> callback)
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{
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ble_error_t err = transport->init(instanceID, callback);
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if (err != BLE_ERROR_NONE) {
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