[linux-dvb] Re: Problem with low frequencies on DVB C card

[Holger Waechtler <holger@convergence.de>]

Hi,

I applied your patch to the NEWSTRUCT branch. Could you please send me a 
note when you get the very low bands working, too?

thanks,

Holger


Kimmo Makkonen wrote:
> 
> Hello!
> 
> I've had exactly the same problem since I got my DVB-c card (Hauppauge rev 
> 2.1) in May. Here is a list of the lowest frequencies in use here and 
> the status with different drivers:
> 
> Frequency                       dvb-20021007  NEWSTRUCT
> ------------------------------  ------------  ---------
> 130 MHz, QAM 64, 7146000 S/s    NO            NO
> 140 MHz, QAM 64, 7146000 S/s    NO            NO
> 150 MHz, QAM 64, 7146000 S/s    NO            YES
> 162 MHz, QAM 64, 6875000 S/s    NO            YES
> 270 MHz, QAM 64, 7146000 S/s    YES           YES
> ....                            YES           YES
> 
> Thanks to Holger's hints I found a solution by trial and error. :)
> Both 0x88 and 0x8a seem to be working values for byte 5 for SP5659.
> 
> According to the specifications at:
> http://assets.zarlink.com/products/data/datasheets/zarlink_SP5659_May_2002.pdf
> these 4 LSB mean P3, P2, P1 and P0:
> 0x88 = 10001000  freq < 174000000   P3 = 1
> 0x84 = 10000100  freq < 470000000   P2 = 1
> 0x81 = 10000001  freq >= 470000000  P0 = 1
> Any idea what the meaning of these "output state ports" are?
> 
> Below are both driver branches patched. The patch for NEWSTRUCT could 
> probably be made a bit nicer.
> 
> Kimmo
> 
> ========================== dvb 0.9.4 cvs ============================
> 
> --- dvb-20021007/driver/tuner.c 2002-10-07 11:57:00.000000000 +0300
> +++ DVB/driver/tuner.c  2002-10-07 12:16:45.000000000 +0300
> @@ -227,7 +227,7 @@
>                  0xffffffffUL, 0xffffffffUL, 0x00, 0x00, 0x00, 0x88},
>          {"SP5659C", MITEL, DVBC,
>                    40000000UL, 870000000UL, 62500, 1, 36125000,
> -                 174000000UL, 470000000UL, 0xa1, 0x84, 0x81, 0x85},
> +                 174000000UL, 470000000UL, 0x88, 0x84, 0x81, 0x85},
>         /*
>          {"SPXXXX", MITEL, DVBC,
>                   40000000UL, 870000000UL, 62500, 1, 38900000,
> 
> ========================== NEWSTRUCT ================================
> 
> --- DVB.orig/driver/frontends/ves1820.c 2002-10-07 12:01:43.000000000 +0300
> +++ DVB/driver/frontends/ves1820.c      2002-10-07 12:40:20.000000000 +0300
> @@ -158,6 +158,8 @@
>          u8 buf [4] = { (div >> 8) & 0x7f, div & 0xff,
>                         byte3[tuner_type],
>                         byte4[tuner_type] | (pwr << 6) };
> +        if (tuner_type == 1)
> +            buf[3] = freq < 174000000 ? 0x88 : freq < 470000000 ? 0x84 : 0x81;
>  
>          return tuner_write (frontend->i2c, addr[tuner_type], buf);
>  }
> 
> 
> 
> 
> 
> 



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