Octagon 6000 Series, User Manual

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8-6
Analog I/O 6000 Series user’s manual
Return registers: Carry flag cleared if successful
Carry flag set if error
AL
Error code
Programming example:
unsigned int dtoa0Data;
asm {
mov ax,0f801h
mov bl,1
/*D/A channel 1 */
mov cx,0800h /*D/A output at about ½ way of full range
*/
mov dx,0ffffh
int 17h
}
Analog to digital average sample size select
Function: f8h
Subfunction: 02h
Purpose: To set the number of samples to average for following
Subfunction 00h calls. This affects all channels, however,
this can be interspersed between A to D reads, giving
different samplings per channel. The default is 1.
Calling registers: AH f8h
AL
02h
CX number of samples (1,2,4,8,16)
DX ffffh
Return registers: Carry flag cleared if successful
AH 00 success
Carry flag set if error
AL
Error code
Programming example:
/* Inline assembly code for Borland C++ 3.1 */
asm {
mov ax,0f802h
mov dx,0ffffh
mov cx,4 /* set to 4 samples on following */
int 17h /* A to D conversions */
}
print(“Number of samples set to %d.\n”,4);