USB 8451 SPI Communication

[Eliran11]

Hi All,

I am tring to write SPI 16 bits command to TI TLV5638 DAC.

Labview examples are for 8 bits only. can anyone help me?

Thanks,

Eliran. 

Message Edited by Eliran11 on 06-29-2008 02:44 AM

[xchiquete]

On Jun 29, 10:10 am, Eliran11 <x...@no.email> wrote:
> Hi All,
> &nbsp;
> I am tring to write SPI 16 bits&nbsp;command to&nbsp;TI TLV5638 DAC.
> Labview examples are for 8 bits only. can anyone help me?
> &nbsp;
> Thanks,
> Eliran.&nbsp;
>
> &nbsp;Message Edited by Eliran11 on 06-29-2008  02:44 AM

I don't know which examples you followed. But, you only have to join 2
8bit words in one 16bit word.

[Eliran11]

But using 2 words of 8 bit causes delay of 10 usec between the 2 words.

[Karunya_R]

Hi Eliran,

The USB 8451 supports only 8 bit communication.

This KB has a suggestion on how to implement 16 bit commands. "The approach you would take when writing or reading a 16 bit number is to write or read a byte array of length 2. You can use a Type Cast to convert back and forth between arrays of 8 bit integers and arrays of 16 bit integers."

Hope this helps!

[Ipshita_C]

Hi Eliran,

The SPI interface in LabView is configured for 8 bits and there is no pre-developed way of avoiding the 10 microsecond delay. Please check this knowledgebase article for further details. This delay does not cause any serious limitations in your program.

Ipshita C.