[rtl-sdr patch?] lib: retry i2c on failure

[Fab Stz]

After a few tests, both are actually needed :

https://github.com/steve-m/librtlsdr/pull/56
 -> Fixes both "r82xx_write: i2c wr failed=-9 reg=17 len=1" & "r82xx_set_freq: 
failed=-9"

https://github.com/steve-m/librtlsdr/pull/58
 -> Fixes "rtlsdr_demod_write_reg failed with -9" by a 2nd try

Regards,

Le mercredi 2 octobre 2019, 10:58:36 CEST Fab Stz a écrit :
> Hello,
> 
> Actually, relaunching the call
>  of libusb_control_transfer
>  in rtlsdr_demod_write_reg
> 
> does the trick for all three messages and sets the frequency correctly
> without error message. This seems to fix also the gain not being set.
> 
> The call of rtlsdr_demod_read_reg is necessary before recalling
> libusb_control_transfer, if we juste call libusb_control_transfer a 2nd time
> this doesn't work.
> 
> The patch in my initial post is not necessary if this one is applied.
> 
> Pull request: https://github.com/steve-m/librtlsdr/pull/58
> 
> Regards
> 
> Le mercredi 2 octobre 2019, 08:25:54 CEST Fab Stz a écrit :
> > Hello,
> > 
> > When doing a setFrequency I usually have this error afterwards and the
> > frequency is actually not changed
> > 
> > rtlsdr_demod_write_reg failed with -9
> > r82xx_write: i2c wr failed=-9 reg=17 len=1
> > r82xx_set_freq: failed=-9
> > 
> > By searching around I found this commit that makes the trick for me.
> > https://github.com/keenerd/rtl-sdr/commit/
> > 9ed9ffa37e24f3293fa960cfcd74909ac3e9996c
> > 
> > This will actually really set the frequency and remove the last 2 errors
> > related to "r82xx". The only error remaining is then
> > 
> > rtlsdr_demod_write_reg failed with -9
> > 
> > 
> > If you can include that upstream that would be nice.
> > I created a pull request here :
> > https://github.com/steve-m/librtlsdr/pull/56
> > 
> > Actually the commit is part of a large PR that you may be interested in ?
> > https://github.com/keenerd/rtl-sdr/pull/8
> > 
> > Regards,