set parity bit

[BENIO]

hello everybody,
I would like to build an application in Lab 7.1 which is sending 16 bits (4 bits command, 11 bit DATA+1 bit parity), in fact I am finding a way to calculate te parity of my STRING, meaning if the number of one's are pair then the parity bit must be automaticaly set to '1', otherwise it stays ''0'' and then send all the 16 bits via SDI.

Does anybody have an idea how easily can be made?

Thanks in advance for support.

Benio

[alipio]

Hi
There are different ways of calculating parity bit
Thi coul be one
Add 1 to sum of bits to invert parity
Hope it helps
Alipio

[Bob_Y.]

The attached VI could give you a place to start.

Hope that this helps,
Bob

[BENIO]

Thank you alipio for the help, this give me an idea how it works with Labview and then I can implemet it in my application.

[alipio]

Hi
Bear in mind that, probably, you will have to receive data, so the same vi should serve to calculate the parity bit of received data and, then, compare with the actual bit to detect errors.

Glad to be of help to you

Cheers
Alipio

[Aliasor]

I realize I'm very late to this discussion.

I found myself needing to determine parity on some U32s that are flooding thru my system. I saw the other 'convert to boolean, sum the TRUEs' VIs, and I thought there must be a way that is lower overhead.

I came up with precalculating a boolean array for 0x00 thru 0xFF, and then indexing that array by the byte value.

For U32 words, I use the one array, break the U32 into 4 bytes, and XOR the boolean outputs. TRUE = ODD parity on the output.

I do hope this helps someone along.