It is certainly possible to change the UART interface to a SPI interface. Note 
that a HCI spi interface is actually more difficult to implement than a HCI 
uart interface so I am not sure why you would prefer SPI but no matter; if that 
is what you want to use you should be able to do it.

You do not mention anything about the controller you are going to be using so 
with no knowledge of the controller it is hard to give any specific help.

> On Feb 9, 2018, at 1:37 AM, Priyanka Rajendran 
> <> wrote:
> Hello Will ,
> Thanks for your support and info. If I succeed I will definitely let you
> know. Is it possible to change the HCI -UART connection to HCI-SPI ?
> Because , in our case SPI is the prefered interface.Since , SPI needs clock
> rate and UART needs baudrate ,I expect it is not tough to handle. As you
> said the existing HCI- SPI is a non-standard one, I think I can atleast
> have some reference from that implemention.
> Best regards,
> Priyanka
> On Wed, Feb 7, 2018 at 2:38 PM, Priyanka Rajendran <
>> wrote:
>> Hello ,
>> I am a student and I am new to BLE. I would like to know if the Mynewt OS
>> and nimBLE host stack (protocol stack part only) can be ported to Atmega
>> microcontroller with 256 kb flash and 32kb RAM.It is a 8-bit mcu and
>> advanced RISC architecture Can I modify the host stack to access any
>> controller of a BLE module.Ealier the HCI was in UART now,in the github I
>> found there is also SPI for HCI. Could the porting be achieved?
>> Thanks in advance

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