[linux-dvb] Kworld DVB-T 210 - dvb tuning problem

Hartmut Hackmann hartmut.hackmann at t-online.de
Sun Apr 13 23:41:23 CEST 2008


Hi,

timf schrieb:
> Hartmut Hackmann wrote:
>> Hi, Tim
>> <snip>
>>>>
>>>> I think i know now how your card needs to be configured.
>>>> Something that seems not to be really clear for you is the 
>>>> configuration
>>>> of the so-called AGC (automatic gain control) of the tuner. This
>>>> needs to be switched according to the function the tuner is used for:
>>>> analog TV -> FM Radio -> DVB-T.
>>>> This is done with the 4052 analog mux and requires 2 control bits -> 
>>>> the GPIOs.
>>>> GPIO 21 is used to switch between analog TV and FM radio.
>>>> Typically GPIO21=0 -> analog TV, GPIO21=1 -> FM Radio.
>>>> In your case, GPIO22 is used to switch between DVB-T and analog 
>>>> while most cards
>>>> use GPIO1 of the tda10046 for this.
>>>>
>>>> You should need to make chages only in saa7134-dvb, dvb_init()
>>>> - remove the old
>>>>     case SAA7134_BOARD_KWORLD_DVBT_210: (plus code)
>>>> -and add it to
>>>>     case SAA7134_BOARD_FLYDVBT_HYBRID_CARDBUS:
>>>>
>>>> That should do it (though we should add a .antenna switch to the 
>>>> configuration).
>>>>
>>>> Best regards
>>>>   Hartmut
>>>>
>>> Hi Hartmut,
>>>
>>>

<snip>

> Hi Hartmut,
> 
> 
> 1) With    .gpio_config   = TDA10046_GP11_I,
> 
> root at ubuntu:/home/timf# tzap -r "TEN HD"
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> tuning to 788500000 Hz
> video pid 0x0202, audio pid 0x0000
> status 00 | signal 9d9d | snr 3333 | ber 0001fffe | unc 0000004d |
> status 1f | signal 9d9d | snr fdfd | ber 000001b8 | unc ffffffff | 
> FE_HAS_LOCK
> status 1f | signal 9c9c | snr fdfd | ber 000001de | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 9c9c | snr fefe | ber 0000017c | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 9c9c | snr fefe | ber 00000182 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 9c9c | snr fefe | ber 000001a4 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 9b9b | snr fefe | ber 00000202 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 9b9b | snr fefe | ber 0000021c | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 9b9b | snr fefe | ber 00000226 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 9c9c | snr fefe | ber 00000234 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 9b9b | snr fefe | ber 00000290 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 9b9b | snr fefe | ber 00000240 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 9c9c | snr fefe | ber 000001fa | unc 00000000 | 
> FE_HAS_LOCK
> 
> Analog-tv also scans fine.
> 

Things should look like this.

> 2) With
> //    .gpio_config   = TDA10046_GP11_I,
>    .gpio_config   = TDA10046_GP00_I,
> 
> timf at ubuntu:~$ sudo -s -H
> [sudo] password for timf:
> root at ubuntu:/home/timf# tzap -r "TEN HD"
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> tuning to 788500000 Hz
> video pid 0x0202, audio pid 0x0000
> status 00 | signal 0000 | snr 9494 | ber 0001fffe | unc 00000000 |
> status 1f | signal 0000 | snr ecec | ber 00019622 | unc ffffffff | 
> FE_HAS_LOCK
> status 1f | signal 0000 | snr f8f8 | ber 00014eac | unc ffffffff | 
> FE_HAS_LOCK
> status 00 | signal 0000 | snr 5e5e | ber 0001fffe | unc 00000000 |
> status 1f | signal 0000 | snr fcfc | ber 00002bcc | unc ffffffff | 
> FE_HAS_LOCK
> status 1f | signal 0000 | snr fdfd | ber 000018a2 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 0000 | snr fdfd | ber 00000e74 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 0000 | snr fdfd | ber 00000912 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 0000 | snr fefe | ber 000006b6 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 0000 | snr fefe | ber 0000068e | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 0000 | snr fdfd | ber 000005c2 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 0000 | snr fefe | ber 00000584 | unc 00000000 | 
> FE_HAS_LOCK
> 
> However, analog-tv fails to scan anything -> "no signal"
> 
This is wrong. Although the channel decoder locks, the signal at its
input is very low.

But this means: The analog -> dvb switch is the GPIO of the channel decoder
*not* GPIO22

so we can fix: we need  .gpio_config   = TDA10046_GP11_I

> 3) antenna_switch
> 
> static int philips_tda827x_tuner_init(struct dvb_frontend *fe)
> {
>    struct saa7134_dev *dev = fe->dvb->priv;
>    struct tda1004x_state *state = fe->demodulator_priv;
> 
>    switch (state->config->antenna_switch) {
>    case 0: break;
>    case 1:    dprintk("setting GPIO21 to 0 (TV antenna?)\n");
>        saa7134_set_gpio(dev, 21, 0);
>        break;
>    case 2: dprintk("setting GPIO21 to 1 (Radio antenna?)\n");
>        saa7134_set_gpio(dev, 21, 1);
>        break;
>    }
>    return 0;
> }
> 
> static int philips_tda827x_tuner_sleep(struct dvb_frontend *fe)
> {
>    struct saa7134_dev *dev = fe->dvb->priv;
>    struct tda1004x_state *state = fe->demodulator_priv;
> 
>    switch (state->config->antenna_switch) {
>    case 0: break;
>    case 1: dprintk("setting GPIO21 to 1 (Radio antenna?)\n");
>        saa7134_set_gpio(dev, 21, 1);
>        break;
>    case 2:    dprintk("setting GPIO21 to 0 (TV antenna?)\n");
>        saa7134_set_gpio(dev, 21, 0);
>        break;
>    }
>    return 0;
> }
> 
> If I put .antenna_switch = 1 or 2, in my struct, dvb-t fails to scan.
> I can't put antenna_switch in my struct, can I, as I am using gpio22?
> So I took it out, and in saa7134-cards.c, changed .radio to this:
> 
I don't believe that this is right.
It is just a static signal and can't be anything else.

>    [SAA7134_BOARD_KWORLD_DVBT_210] = {
>        .name           = "KWorld DVB-T 210",
>        .audio_clock    = 0x00187de7,
>        .tuner_type     = TUNER_PHILIPS_TDA8290,
>        .radio_type     = UNSET,
>        .tuner_addr    = ADDR_UNSET,
>        .radio_addr    = ADDR_UNSET,
>        .mpeg           = SAA7134_MPEG_DVB,
>        .gpiomask    = 0 << 21,
>        .inputs = {{
>            .name   = name_tv,
>            .vmux   = 1,
>            .amux   = TV,
>            .tv     = 1,
>        },{
>            .name   = name_comp1,
>            .vmux   = 3,
>            .amux   = LINE1,
>        },{
>            .name   = name_svideo,
>            .vmux   = 8,
>            .amux   = LINE1,
>        }},
>        .radio = {
>            .name   = name_radio,
>            .amux   = TV,
>            .gpio    = 0x00000000,

This is wrong. It has to be .gpio = 0x0200000, as it was in the original
source code.

>        },
>    },
> I still can't tune to a radio cahnnel.
> I'm not sure how to switch to radio, I'm not even sure which gpio it's on.
> I assume it's on gpio21, but I've tried various configs - none work.
> 
> Regards,
> Tim
> 
Tim, seriously: For me it looks like you messed up the entire code. I would
recommend you roll back completely and start over again.


Hartmut



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