Initializing an ADC

Question

Hi There,
I am trying to do something that is very much simple to do in C, but since I dont have much experience in LABVIEW, I am loosing so many precious hours. Here is what I want to do. I have two sections of the code as the way I wanted. Its just a matter of combining them together.
The ADC in questioin is an AD7490 12 bit ADC. When it is powered up, it needs to go through something called a DUMMY OPERATION.
I managed to get he data that needs to be input during the dummy operation. Here is what I want to do.
The first 2 cycles require the /CS (Chicp Select - active LOW) pin of the ADC to be LOW and then the DATA pin needs to be tied to 1. I managed to do this manually.I also got the second part of the data to work.
The main thing that is bugging me is how I would combine both these codes togetherso that at the end, when the user presses the INITIALIZE button, the initializtion needs to be done. I am attaching my Labview code here.
It would be really good if you could help me out. Im attaching the PDF of the aD7490 as well.
Thanks
Labmat.
Attachments:
AD7490.pdf ‏682 KB
Main Control Program.vi ‏147 KB

Answer 1

Spoiler (Highlight to read)
To simplify your clock, use the Initialize Array function to create an array of ones and another to create an array of zeros, then interleave them. This will allow you to drive a for-loop using auto-indexing. Nice and clean.
To simplify your clock, use the Initialize Array function to create an array of ones and another to create an array of zeros, then interleave them. This will allow you to drive a for-loop using auto-indexing. Nice and clean.
how would one go about and do this clock generation using the initialize array. Correct me if Im wrong. If we have two arrays of 1s and 0s then when we "interleve" them, dont we have to create a delay between the 1st and 0s to represent a digital waveform? the delay would be a 50% duty cycle delay (ON time = OFF time)? Wouldnt the solution with the inverter do the trick?
I have managed to send the data bits on every -ve clock edge. Jamie's solution was to use a state machine - which was exactly what I had in mind. This would mean that without the user pressing the initialize button, on startup of the program, the ADC would go into an initialize mode and then the normal mode.
the solution that I have now (although a bit messy), when viewed through a logic analyzer, shows that it is doing exactly what I want it to do. I have attached the coder here FYI. right now, the program will send a burst of data (2 times) as soon as the CS control is clicked. then from the third time onwards, it will send a data stream with the particular databits ON and OFF (representing the control register of the ADC).
How would we automate this as I explained before?
Thanks,
Kind REgards,
LABMAT
Attachments:
Main Control Program.vi ‏148 KB
Main Control Program.vi ‏148 KB