2 Visual Components Manuals

IN VCHandle UDINT The handle returned by VA_Setup
IN percent UDINT
Contrast intensity
000 dark
500 standard
100 light
OUT Return Value UINT Not equal to 0 if error occurs
3.3.8.26.2 Example for Automation Basic
(* cyclic program *)
if ready 1 then
VC_HANDLE = VA_Setup(1 "vga") ,
if VC_HANDLE 0 then
ready = 1
endif
endif
if ready = 1 then
VA_Saccess(1,VC_HANDLE)= if
0 then
endif
3.3.8.26.3 Example for C Programming
#include
#include
#include
UINT _GLOBAL ready;
UDINT _GLOBAL percent;
unsigned long VC_HANDLE;
VA_SetContrast(1,VC_HANDLE,percent)
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))
{
VA_SetContrast(1,VC_HANDLE,percent);
VA_Srelease(1,VC_HANDLE);
}
}
}
3.3.8.26.4 Example: Setting Contrast/Brightness
#include
Introduction to Visual Components 2.3
#include #include #define VC_SETUP 0 #define VC_WAIT 10
#define VC_SETCONTRAST 30 #define VC_SETBRIGHTNESS 40 _GLOBAL UDINT VC_Handle; _LOCAL UINT Step,
ContrastValue, OldContrastValue, BrightnessValue, OldBrightnessValue; _INIT void Init_Routine(void)
{ VC_Handle=0; if (ContrastValue == 0) ContrastValue = 60; else if (BrightnessValue==0)
BrightnessValue=60; Step = VC_SETUP; } _CYCLIC void Cyclic_Routine(void) { switch (Step) { case
VC_SETUP: VC_Handle = VA_Setup(1, "visu"); if (VC_Handle != 0) Step = VC_WAIT; break; case VC_WAIT: if
(ContrastValue != OldContrastValue) { OldContrastValue = ContrastValue; Step = VC_SETCONTRAST; } if
(BrightnessValue != OldBrightnessValue) { OldBrightnessValue=BrightnessValue; Step=
VC_SETBRIGHTNESS; } break; case VC_SETCONTRAST: if (!VA_Saccess(1,VC_Handle)) {
VA_SetContrast(1,VC_Handle,ContrastValue); VA_Srelease(1,VC_Handle); } Step = VC_WAIT; break; case
VC_SETBRIGHTNESS: if (!VA_Saccess(1,VC_Handle)) { VA_SetBrightness(1,VC_Handle,BrightnessValue);
VA_Srelease(1,VC_Handle); } Step = VC_WAIT; break; } }
162 3.3.8.26 Setting Contrast and Brightness − VA_SetContrast