IQ Data form usb is signed?

[wzyy2]

If I google "hackrf iq",I will be told that "The HackRF logs are IQ data pairs, stored as unsigned 8 bit integers "..............
even comment in gr-osmosdr say is unsigned.....

/* HackRF device produces 8 bit unsigned IQ data */
...........
    _lut.push_back( gr_complex( (float(char(i >> 8))) * (1.0f/128.0f),
                                (float(char(i & 0xff))) * (1.0f/128.0f) ) );
...........

Maybe It should be mentioned.

[mossmann]

The data are signed but were once (more than a year ago) unsigned.

[a232319779]

HI,mossmann,
which firmware version had been changed?
How about the version : 2014.08.01

[a232319779]

I should ask clearly:
it's signed at the firmware version 2014.08.01?

[dominicgs]

Yes, the change to signed data was introduced in release 2014.08.1.