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Cinaed Simson cinaed.simson at gmail.comOn 01/10/2017 11:06 PM, Steve Knoeck wrote:
> Hi,
>
> I get a floating point exception when I run rtl_tcp. I traced the error
> with GDB to line 515 of tuner_r82xx.c
> if (vco_fra > (2 * pll_ref_khz / n_sdm))
> I found that n_sdm was 0.
>
> I don't understand how this code work and I'm very new to this software
> but it sure looks like a programming bug.
>
> | 513 /* sdm calculator */||
> || 514 while (vco_fra > 1) {||
> || 515 if (vco_fra > (2 * pll_ref_khz / n_sdm)) {||
> || 516 sdm = sdm + 32768 / (n_sdm / 2);||
> || 517 vco_fra = vco_fra - 2 * pll_ref_khz /
> n_sdm;||
> || 518 if (n_sdm >= 0x8000)||
> || 519 break;||
> || 520 }||
> || 521 n_sdm <<= 1;||
> || 522 }|
>
> If the condition on line 515 ever evaluates to false then vco_fra
> doesn't get updated. The loop will keep repeating with the same value
> of vco_fra until n_sdm becomes 0.
>
> Steve
I'm using rtl_tcp from
http://git.osmocom.org/rtl-sdr/rtl-sdr-0.5.3.tar.xz with
gnuradio-3.7.10.1 and it works perfectly.
Which version are you using?
-- Cinaed