SPI write 16 bit

[nathand]

I wrote code a few weeks ago using this library that re-configures the number of bits (although I only use full bytes) and it works fine. Can you share your code?

[Thierry-91]

This is the code:

I send two bytes: xC0 xC0 Followed by seven bytes x02 x28 x87 xFA x00 x00 x00

I want CS reset high between the two sequences

I obtain the first frame OK

the second frame is truncated at 2 bytes x02 x28

In fact it is truncated at the length secified in the first configuration VI

Thanks for your help

Best regards

Thierry

[GM_1]

Hi Thierry,

The API consists of FPGA VI´s and RT VI´s.

Open a new VI in FPGA. Go to Connectivity -> SPI -> SPI Engine. Place it in your VI. Configure your SPI FPGA IO and compile it.

Then open a new VI in RT. In your case, the RT VI could look like in the picture I uploaded.

Regards,

GM_1

[Thierry-91]

Hi GM_1

I have tested this solution; It works, but the problem is that I have 12 ms between the two sequences (frame C0, C0 and frame 02, 28, 87, FA, 0, 0, 0)

This delay is absolutly unacceptable in my application and I have no idea of the reason of this delay

It is the reason why I was trying to make all the sequence inside the FPGA

Any idea of the reason of this delay?

Thanks

Best regards

Thierry

[Thierry-91]

SOLVED!!

The only thing to do was to introduce a small delay (few µs) before a re-configure, doing this it is taken into account

Thanks to GM_1 and Nathand for their help

Best regards

Thierry