[linux-dvb] [linux-dvb]It's is bad value to Signal strength of PCTV-SAT card.

["Sukwoo,Jang" <jhanglim@comingmedia.com>]

My Card is pinnacle PCTV-SAT.
I'm watching TV over Windows XP.
But I don't watching TV over Linux.

if(( ioctl(front, FE_READ_SIGNAL_STRENGTH, &strength)) < 0){
    perror("STRENGTH: ");
    close(front);
    return -1;
  }
  printf("strength : %x\n",strength);

strength  ===>>  ffffcaca

and status : 1,3,5 or 7
     snr < 2f0e
     ber => 0

////////////////////////////////
Fedora Core2 Test3 ( Kernel 2.6.5 )
LNB : Ku-Band
Sat. : koreasat3 (116.0E)


//My sample source
#include <sys/ioctl.h>
#include <stdio.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <unistd.h>
#include <linux/dvb/dmx.h>
#include <linux/dvb/frontend.h>
#include <sys/poll.h>
#define DMX "/dev/dvb/adapter0/demux0"
#define FRONT "/dev/dvb/adapter0/frontend0"
#define SEC "/dev/dvb/adapter0/sec0"

/* tune qpsk */
/* freq: frequency of transponder */
/* vpid, apid, tpid: PIDs of video, audio and teletext TS packets */
/* diseqc: DiSEqC address of the used LNB */
/* pol: Polarisation */
/* srate: Symbol Rate */
/* fec. FEC */
/* lnb_lof1: local frequency of lower LNB band */
/* lnb_lof2: local frequency of upper LNB band */
/* lnb_slof: switch frequency of LNB */
main()
{
  int ret;
  struct dmx_pes_filter_params pesFilterParams;
  struct dvb_frontend_parameters frp;
  struct pollfd pfd[1];
  int demux0, front;
  int vpid, apid, tpid;
  fe_status_t status;
  uint32_t ber;
  int16_t snr, strength;


  int lnb_lof1 = 10750;
  int lnb_lof2 = 10750;
  int lnb_slof = 0;
  int frequency = 12370000;
  int symbolrate = 24079000;

  vpid = 1202;
  apid = 1200;
  fe_code_rate_t fec = FE_CAN_FEC_5_6;

  if((front = open(FRONT,O_RDWR)) < 0){
    perror("FRONTEND DEVICE: ");
    return -1;
  }
/*
  if ((demux0=open(DMX, O_RDWR|O_NONBLOCK)) < 0){
    perror("DEMUX DEVICE: ");
    return -1;
  }
*/
  if (frequency < lnb_slof) {
    frp.frequency = (frequency - lnb_lof1);
  } else {
    frp.frequency = (frequency - lnb_lof2);
  }
  frp.inversion = INVERSION_AUTO;
  frp.u.qpsk.symbol_rate = symbolrate;
  frp.u.qpsk.fec_inner = fec;
  if (ioctl(front, FE_SET_FRONTEND, &frp) < 0){
    perror("QPSK TUNE: ");
    close(front);
    return -1;
  }

  //wait...
  sleep(3);

  if((ret = ioctl(front, FE_READ_STATUS, &status)) < 0){
    perror("STATUS: ");
    close(front);
    return -1;
  }
  printf("status : %x\n",status);

  if((ret = ioctl(front, FE_READ_BER, &ber)) < 0){
    perror("BER: ");
    close(front);
    return -1;
  }
  printf("ber : %x\n",ber);

  if((ret = ioctl(front, FE_READ_SNR, &snr)) < 0){
    perror("SNR: ");
    close(front);
    return -1;
  }
  printf("snr : %x\n",snr);

  if((ret = ioctl(front, FE_READ_SIGNAL_STRENGTH, &strength)) < 0){
    perror("STRENGTH: ");
    close(front);
    return -1;
  }
  printf("strength : %x\n",strength);

/*
  printf("Getting QPSK event\n");
  if ( ioctl(front, FE_GET_EVENT, &event) == -EOVERFLOW){
    perror("qpsk get event");
    return -1;
  }
*/
/*
  pesFilterParams.pid = vpid;
  pesFilterParams.input = DMX_IN_FRONTEND;
  pesFilterParams.output = DMX_OUT_DECODER;
  pesFilterParams.pes_type = DMX_PES_VIDEO;
  pesFilterParams.flags = DMX_IMMEDIATE_START;
  if (ioctl(demux0, DMX_SET_PES_FILTER, &pesFilterParams) < 0){
    perror("set_vpid");
    return -1;
  }
  pesFilterParams.pid = apid;
  pesFilterParams.input = DMX_IN_FRONTEND;
  pesFilterParams.output = DMX_OUT_DECODER;
  pesFilterParams.pes_type = DMX_PES_AUDIO;
  pesFilterParams.flags = DMX_IMMEDIATE_START;
  if (ioctl(demux2, DMX_SET_PES_FILTER, &pesFilterParams) < 0){
    perror("set_apid");
    return -1;
  }
*/
close(front); 
}



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