Re: [Discuss-gnuradio] transmitting gain in usrp sink

[Ankit Kaushik]

On 19.06.2013 17:51, lingeswar kandregula wrote:
> i saw that link before.. there are VGA and BB in the transmitting path 
> if we consider the XCVR daughter board. is that distributed between 
> these two or anything else also shares it? ..
There are only two gains (BB and VGA) that can be controlled over the 
uhd interface...
Again I don't know for what is your purpose and assuming you are using 
uhd for setting gains.....
You can set the BB and VGA gains values individually using the name 
argument....

set_gain(uhd_usrp_source_sptr self, double gain, std::string const & 
name, size_t chan=0)

  double xcvr2450::set_tx_gain(double gain, const std::string &name){
    assert_has(xcvr_tx_gain_ranges.keys(), name, "xcvr tx gain name");
    if (name == "VGA"){
        _max2829_regs.tx_vga_gain = gain_to_tx_vga_reg(gain);
        send_reg(0xC);
    }
    else if(name == "BB"){
        _max2829_regs.tx_baseband_gain = gain_to_tx_bb_reg(gain);
        send_reg(0x9);
    }
    else UHD_THROW_INVALID_CODE_PATH();
    _tx_gains[name] = gain;

    return gain;
}

double xcvr2450::set_rx_gain(double gain, const std::string &name){
    assert_has(xcvr_rx_gain_ranges.keys(), name, "xcvr rx gain name");
    if (name == "VGA"){
        _max2829_regs.rx_vga_gain = gain_to_rx_vga_reg(gain);
        send_reg(0xB);
    }
    else if(name == "LNA"){
        _max2829_regs.rx_lna_gain = gain_to_rx_lna_reg(gain);
        send_reg(0xB);
    }
    else UHD_THROW_INVALID_CODE_PATH();
    _rx_gains[name] = gain;

    return gain;
}

Ankit