SPBTLE-RF dialog over SPI

Posted on March 31, 2016 at 11:41

Hi,

I'm currently working on using SPBTLE-RF module with the evaluation board of the KL25Z from Freescale.

After I set up the SPI interface, I tried a byte-communication with the module by sending Write Header ( 0x0a, 0x00, 0x00,0x00, 0x00), some data (supposed to be HCI command, see further) and then the Read Header ( 0x0b, 0x00, 0x00,0x00, 0x00) in order to get something in return . 

Here is what I send/receive :

---- START ----

 

****

 

SLAVE HEADER WRITE

 

0x02    0x7F    0x00    0x07    0x00

 

****

 

Received : 0xFF

 

Sent : 0x01

 

Received : 0xFF

 

Sent : 0x09

 

Received : 0xFF

 

Sent : 0x04

 

Received : 0xFF

 

Sent : 0x00

 

****

 

SLAVE HEADER READ

 

0x02    0x00    0x00    0x00    0x00

 

****

 

---- END ----

Whenever I try to read some data (by sending read header) coming from the module after performing a write operation (by sending write header, even without data), the slave seems to announce that he's ready (CTRL byte = 0x02) but he hasn't anything to offer (W/RBUF_lo/hi = 0x00).

Plus, if I try to read data without sending any write request before, here is what I get :

---- START ----

 

****

 

SLAVE HEADER READ

 

0x02    0x7D    0x00    0x07    0x00

 

****

 

READ RECEPTION BUFFER

 

Received : 0x04

 

Received : 0x0F

 

Received : 0x04

 

Received : 0x01

 

Received : 0x01

 

Received : 0x09

 

Received : 0x04

 

---- END ----

I'm quite new to SPI communications, am I doing this right ? 

About using HCI commands, is there any special formatting step before sending that I could missed ? Is it even possible to send that kind of frame with direct bytes on the SPI bus ?

Thanks,

B.TOMAS

#hci #spi #kl25z #spbtle-rf