AnsweredAssumed Answered

AD9858 eval. Board DAC adressing problem

Question asked by jeken on Jun 25, 2013
Latest reply on Jun 27, 2013 by jeken

Hi there guys.

 

first of all, pls excuse my bad english, i'm non native

my problem :

i have an AD9858/PCBZ Evaluation Board Z Ref(F) here, which is the

simple DDS DAC type of the board. I can run it via the given software

and get exactly the results as i expect them on the spectrum analyzer.

But now i want to (and actually need to) run it via LABVIEW to implement

it into my experimental setup. (i want to use it as a freq. generator).

to aquire control of the board i want to use the same LPT1 parallel port the

software uses.

the problem is that i have no idea how to adress it correctly.

i know how to adress the registers and single bits of the registers of the parallel port

in labview via "Out Port.VI" and "In Port.VI".

what i dont know is, which pin (and thus bit of which register) corresponds to

which function / pin on the board.

what i know is the adressing inside the board which is explained in the datasheet.

for example how to set the Freq tuning word for profile 1. i know the adress and the value

i have to give it.

But how is it actually done ? I think i have to pull the "Write Pin / Bit" first and then

send adress and then the data ? is that correct ?

but which pin of the parallel port corresponds to the write? or read ? or reset ?

has anyone experience in using these kind of boards with labview ?

or is there a simpler way then giving it ones and zeroes ??

thanks for your help, much appriciated !

regards, jeken

 

ps.: if there is any api, dll or similar available, pls tell. i'd be more than happy to use

that instead of doing it the way i try now ..

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