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IQ Data form usb is signed? #155

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wzyy2 opened this issue Jan 5, 2015 · 4 comments
Closed

IQ Data form usb is signed? #155

wzyy2 opened this issue Jan 5, 2015 · 4 comments
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software technical support

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@wzyy2
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@wzyy2 wzyy2 commented Jan 5, 2015

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
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@mossmann mossmann commented Apr 8, 2015

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

@a232319779
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@a232319779 a232319779 commented Jan 22, 2017

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

@a232319779
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@a232319779 a232319779 commented Jan 22, 2017

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

@dominicgs
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@dominicgs dominicgs commented Jan 22, 2017

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

@straithe straithe added software technical support labels Feb 2, 2021
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