2 Visual Components Manuals

}
3.3.8.24 Disable − enable backlight − VA_SetBacklight
The backlight can be enable and disable by the function VA_SetBacklight.
3.3.8.24.1 Parameter
I/O Parameter Type Bedeutung
IN enable BOOL This function is only executed if enable is TRUE.
IN VCHandle UDINT The handle returned by VA_Setup.
IN blnState BOOL
Disable − enable backlight
000disable
10 enabel
OUT Rückgabewert UINT Not equal to 0 if error occursl
3.3.8.24.2 Example for Automation Basic
(* cyclic program *)
if ready 1 then
VC_HANDLE = VA_Setup(1,"visu")
if VC_HANDLE 0 then
ready = 1
endif
endif
if ready = 1 then
if VA_Saccess(1,VC_HANDLE)= 0 then
VA_SetBacklight(1,VC_HANDLE,blnState)
VA_Srelease(1,VC_HANDLE)
endif
endif
3.3.8.24.3 Example for C Programming
#include
#include
#include
UINT _GLOBAL ready;
BOOL _GLOBAL blnState;
unsigned long VC_HANDLE;
_CYCLIC void Zyklisch(void)
{
if (!ready)
{
VC_HANDLE = VA_Setup(1 "visu"); ,
if (VC_HANDLE)
ready = 1;
}
if (ready)
{
if (!VA_Saccess(1,VC_HANDLE))
{
Backlight(1,VC_HANDLE,blnState);
VA_Set
VA_Srelease(1,VC_HANDLE);
}
}
}
3.3.8.25 Setting Contrast and Brightness − VA_SetBrightness
Introduction to Visual Components 2.3
The brightness of a PP can be set with the VA_SetBrightness function. This function is available on TFT and
LCD displays.
160 3.3.8.24 Disable − enable backlight − VA_SetBacklight