Can inband_2rxhb_2tx.rbf use 8 bits sample?

GNU Radio
1

Hi all, I want to use 8 bits sample. I use inband_2rxhb_2tx.rbf
firmware. I
use set_format( ) set data format as width 8 bits and shift 8 bits
and the return true. But when I read data the data still 16 bits format.
I
do not use gr stuff to read data, however I directly read data.
If I use 16 bits format logic to process data the process is correct but
if
I use 8 bits logic to process data the process is wrong, so it
seems the data format still be 16 bits.

2

seems inband_2rxhb_2tx.rbf not support 8 bits sample I change
std_2rxhb_2tx.rbf then it works.
But still can not use 4 bit sample, when I set the data width as 4 bits
then
read the data width which
is changed to 16. In usrp document it said can use 4 bits sample then
how
can I make it works?