ADC 100 Guia do Utilizador descarregar pdf (Página 15)

Technical reference

3.3.11

adc100_set_trigger

PREF1 void PREF2 adc100_set_trigger (

unsigned short enabled,

unsigned short auto_trigger,

unsigned short auto_ms,

unsigned short channel,

unsigned short dir,

unsigned short threshold,

unsigned short delay);

This routine defines a trigger event for the next block operation, and specifies the

delay between the trigger event and the start of collecting the data block. Note that

the delay can be negative for pre-trigger.

If the computer is stuck waiting for a trigger that never occurs, you can abort the data

collection by pressing the F10 key.

Arguments:

enabled

- this is TRUE if the ADC-100 is to wait for a trigger

event, and FALSE if the ADC-100 is to start collecting

data

auto_trigger

- this is TRUE if the ADC-100 is to trigger after a

specified time (even if no trigger event occurs). This

prevents the computer from locking up, if no trigger

event occurs

auto_ms

specifies the time in ms after which auto_trigger will

occur

channel

specifies which channel is to be used as the trigger

input:

0 - channel A

1 - channel B

dir

the direction can be rising or falling

threshold

- this is the threshold at which a trigger event on

channel A or B takes place. It is scaled in ADC counts

delay

- This specifies the delay between the trigger event and

the start of the block,as a percentage of the block size.

Thus, 0% means the first data value in the block, and

-50% means that the trigger event is in the middle of

the block

Returns:

none

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