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AT91RM9200-CJ-002 Datasheet(PDF) 96 Page - ATMEL Corporation

Part # AT91RM9200-CJ-002
Description  ARM920T-based Microcontroller
Download  701 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT91RM9200-CJ-002 Datasheet(HTML) 96 Page - ATMEL Corporation

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1768I–ATARM–09-Jul-09
AT91RM9200
14.2.1.3
Service Entry Point
Each AT91 service, except for the ROM Entry Service (see 14.3.2 “ROM Entry Service” on
page 99), defines a function named AT91F_Open_<Service>. It is the only entry point defined
for a service. Even if the functions AT91F_Open_<Service> may be compared with object
constructors, they do not act as constructors in that they initiate the service structure but they do
not allocate it. Thus the customer application must allocate it.
Example
// Allocation of the service structure
AT91S_Pipe pipe;
// Opening of the service
AT91PS_Pipe pPipe = AT91F_OpenPipe(&pipe, …);
Method pointers in the service structure are initialized to the default methods defined in the
AT91 service. Other fields in the service structure are initialized to default values or with the
arguments of the function AT91F_Open_<Service>.
In summary, an application must know what the service structure is and where the function
AT91F_Open_<Service>
is.
The default function AT91F_Open_<Service> may be redefined by the application or com-
prised in an application-defined function.
14.2.2
Using a Service
14.2.2.1
Opening a Service
The entry point to a service is established by initializing the service structure. An open function is
associated with each service structure, except for the ROM Entry Service (see 14.3.2 “ROM
Entry Service” on page 99). Thus, only the functions AT91F_Open_<service> are visible from
the user side. Access to the service methods is made via function pointers in the service
structure.
The function AT91F_Open_<service> has at least one argument: a pointer to the service
structure that must be allocated elsewhere. It returns a pointer to the base service structure or a
pointer to this service structure.
The function AT91F_Open_<service> initializes all data members and method pointers. All
function pointers in the service structure are set to the service’s functions.
The advantage of this method is to offer a single entry point for a service. The methods of a ser-
vice are initialized by the open function and each member can be overloaded.
14.2.2.2
Overloading a Method
Default methods are defined for all services provided in ROM. These methods may not be
adapted to a project requirement. It is possible to overload default methods by methods defined
in the project.
A m e thod is a po inter to a fun c tion. This pointer is in itialized by the functio n
AT91F_Open_<Service>
. To overload one or several methods in a service, the function
pointer must be updated to the new method.
It is possible to overload just one method of a service or all the methods of a service. In this latter
case, the functionality of the service is user-defined, but still works on the same data structure.


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