2 Visual Components Manuals

eak;
}
case 3:
(!VA_Saccess(1,VCHandle)) if
{
/*Touch Calib OK*/
if (MeinStatus == 0)
break;
}
/*VC HAndle } !=0*/
}
}
VA_Srelease(1,VCHandle);
calib = 3;
MeinStatus = VA_GetCalStatus(1, VCHandle);
VA_Srelease(1,VCHandle);
calib = 0;
3.3.8.10 Determining Contrast − VA_GetContrast
The VA_GetContrast function returns the set contrast value of the display (0−100).
Note:
This function is only available on the PP41.
3.3.8.10.1 Parameter
I/O Parameter Type Meaning
IN enable BOOL This function is only executed if enable is TRUE.
IN VCHandle UDINT The handle returned by VA_Setup.
OUT Return Value UINT Set contrast value of the display..
3.3.8.10.2 Example for Automation Basic
(* cyclic program *)
if ready 1 then
VC_HANDLE = VA_Setup(1 "vga") ,
VC_HANDLE if 0 then
ready = 1
endif
endif
if ready = 1 then
VA_Saccess(1,VC_HANDLE)= if
0 then
endif
3.3.8.10.3 Example for C Programming
#include
#include
#include
UINT _GLOBAL ready;
UINT _GLOBAL Contrast;
unsigned long VC_HANDLE;
Contrast = VA_GetContrast(1,VC_HANDLE)
VA_Srelease(1,VC_HANDLE)
endif
_CYCLIC void Cyclic(void)
{
if (!ready)
{
VC_HANDLE = VA_Setup(1 "vga"); ,
if (VC_HANDLE)
ready = 1;
}
if (ready)
{
if (!VA_Saccess(1,VC_HANDLE))
Introduction to Visual Components 2.3
146 3.3.8.10 Determining Contrast − VA_GetContrast