AN3128 datasheet(53/105 Pages) STMICROELECTRONICS

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AN3128

Multi-input embedded GUI library firmware

Doc ID 16918 Rev 5

53/105

Example:

int main(void)

{

...

Set_LastFlashMemoryAddress( 0x08040000 );

...

}

The address of the Flash memory page, where the calibration parameters are saved, is

calculated by subtracting from the last Flash memory address, the size of one memory page

corresponding to “1024” (if a page is “1024 bytes”) and the size in bytes of a memory

pointer, “4” (32-bit), just to align the address to the start of a memory page location.

Therefore, if the Flash memory size is 256 KB and the ROM start address is 0x08000000, it

is necessary to subtract 0x0400+0x0004=0x0404 (1024+4=1028 in decimal) from

0x08040000 that is the last Flash memory address. The result is: 0x0803EFD8.

4.1.33

CursorInit API global function

The cursor is composed of two essential elements. The first is a data structure which

gathers all the necessary variables for regular cursor operations including user-defined

settings, and secondly a graphic appearance displayed on a screen, letting the user know

about its position as a main purpose of it.

In the meantime, the cursor seems to act as a graphic object, but it is different because it is

not involved in the user events management.

Although the actual implementation of the cursor can manage only the input from the

joystick, its structure also supports the input from the mouse connected to a USB port (this

feature is to be available in a future release).

The cursor data structure gathers all variables needed for the regular functioning of service

routines, such as coordinates, press state, pointer to the cursor bitmap mask, and array of

background pixel color. This array, together with a pixels pointer mask serves as storage for

pixels located behind an actual pointer mark. They must be saved before the cursor is

displayed, in order to allow the removal of the cursor when just these stored pixels are

employed to overdraw an old-positioned cursor. Therefore, no information is lost by cursor

drawing (moving).

The CursorInit function initializes a cursor, allocating the memory for the cursor data

structure and afterwards allocating the memory for behind data pixels regarding the number

of pixels listed in the pointer mark header. Table 38 describes the CursorInit function:

Table 38.

CursorInit API global function

Name

Description

Function name

CursorInit

Function prototype

ErrorStatus CursorInit (GL_uint8_t *PointerMark)

Behavior description

Initiate the cursor including allocating memory for structure and behind

array.

Input parameter {x}

*PointerMark: pointer to the cursor mask

Output parameter {x}

None

Return value

None

Required preconditions None

Called functions

No API/HAL layer functions

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