SPI MISO line shows no data

[Rohan16]

I have interfaced ADC12138 to Digital Discovery board and observing data on MISO line.SPI Clock frequeny is 100Khz and expecting some data change on MISO line for various commands related to ADC sent over MOSI line.

there is no data observed on MISO line except 0x00 for any command sent to MOSI line. what could be the reason of this issue ? is there any setting need to be performed for SPI Protocol instrument . wiring diagram of circuit is also attached.

[attila]

Hi @Rohan16

Currently you are only sending an 0x0A 8bit command.
Enter the words you want to write here, like it is by default prefilled:

[Rohan16]

@attila Thanks for the reply . How do we send the exact 13 bits of data with follwing format  ?  because for 16 bits , it shifts the data and does not appear correct on logic analyzer .

" Protocol.SPI.ReadWrite(XX,[0xXXX])" .........13 bits of data with 13 clock cycles 

[attila]

Hi @Rohan16

See the following:

  

[Rohan16]

@attila In your case , The 0th clock pulse is empty and data transffer starts from 1st clock pulse.

I want to start the data transffer from 0th clock pulse so that it will sync it to clock pulses from start .

and also is there a syntax in script  to send the  binary data (for e.g 101010) ?

[attila]

Hi @Rohan16

The embedded JavaScript does not support binary number format but the interface does.

[Rohan16]

@attila and can you please comment on starting data transffer from 0th clock pulse ?

[attila]

Hi @Rohan16

If you referring to the SPI mode with '0th clock pulse' ? This can be adjusted with Polarity and Phase options.