Sensoray 512 DOS - Manual (Page 18)

18
6.3 X12_SENDCOMMAND function call
The X12_SENDCOMMAND function is used to send a command to the 512 driver. See section 6.3 for
command details.
Entry:
Register Description Value
SI Function number X12_SENDCOMMAND + either CARD0 for the first card
or CARD1 for the second card.
AX Command X12_VI_START
X12_VI_STOP
X12_VI_GETDMADATA
X12_VI_PUTDMADATA
X12_VI_SETINPUT
X12_VI_SETINPUTTYPE
X12_VI_GETSTATUS
X12_RESETDEVICE
Exit:
Register Description Value
AX Timeout flag Non-zero is timeout
Zero is success
Example:
#include “x12.h” //Included for 512 dos driver support
#include “dos.h” //Included for software interrupt support
.
.
X12PARAM _far *Param; //Declare a pointer to an X12PARAM object
union REGS regs; //
.
.
regs.x.si = X12_GETCMDPARAPTR + CARD0; //Select the driver function
int86(X12INT,&regs,&regs); //Call the driver
Param = (X12PARAM _far *) MK_FP(regs.x.dx, regs.x.ax); //Make a pointer from the returned register values
Param->Mode = ENCODE;
regs.x.ax = X12_VI_START; //The video start command
regs.x.si = X12_SENDCOMMAND + CARD0; //Select the driver function
int86(X12INT,&regs,&regs); //Call the driver
if(regs.x.ax)
{
printf("Error Timeout\n");
return 0;
}
IMPORTANT: Every time the X12_SENDCOMMAND is called any changes to the X12PARAM
members DO0, DO1, DO2 or DDIR0, DDIR1, DDIR2 take effect. Upon return VQSize, DI0, DI1, DI2,
DroppedFrames, FrameCount, and Status are updated.