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Programmer's reference21

5.4.6

HRDLGetSingleValueAsync

short HRDLGetSingleValueAsync (

short handle,

long * value,

short * overflow )

This function retrieves the reading when the HRDLCollectSingleValueAsync has been

called.

Arguments

handle

Handle returned by HRDLOpenUnit

value

Pointer to a long where the ADC value will be written

overflow

Pointer to a value that indicates when the voltage on a channel has

exceeded the upper or lower limits.

Bit 0: Channel 1

...

Bit 15: Channel 16

Returns

1 if a valid handle is passed and the function succeeds

0 if not

Sample code

Code extract to get a single value reading without blocking the calling thread:

void main()

{

BOOL bConversionFinished = FALSE;

short channelNo;

long value;

short handle;

// open and initialise the unit

// set the channel parameters

channelNo = HRDL_ANALOG_IN_CHANNEL_1;

range = HRDL_2500_MV;

singleEnded = TRUE;

bConversionFinished = FALSE;

while (true)

{

PollSingleValue(handle,

&bConversionFinished,

&value,

channelNo,

range,

singleEnded);

if(bConversionFinished == TRUE)

{

// do something with the value

channelNo++;