//
// Copyright 2010-2014 Ettus Research LLC
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

#include "x300_adc_ctrl.hpp"
#include "ads62p48_regs.hpp"
#include <uhd/types/ranges.hpp>
#include <uhd/utils/log.hpp>
#include <uhd/utils/safe_call.hpp>
#include <uhd/exception.hpp>

using namespace uhd;

x300_adc_ctrl::~x300_adc_ctrl(void){
    /* NOP */
}

/*!
 * A X300 codec control specific to the ads62p48 ic.
 */
class x300_adc_ctrl_impl : public x300_adc_ctrl
{
public:
    x300_adc_ctrl_impl(uhd::spi_iface::sptr iface, const size_t slaveno):
        _iface(iface), _slaveno(slaveno)
    {
        init();
    }

    void init()
    {
        //power-up adc
       _ads62p48_regs.reset = 1;
        this->send_ads62p48_reg(0x00); //issue a reset to the ADC
       _ads62p48_regs.reset = 0;

        _ads62p48_regs.enable_low_speed_mode = 0;
        _ads62p48_regs.ref = ads62p48_regs_t::REF_INTERNAL;
        _ads62p48_regs.standby = ads62p48_regs_t::STANDBY_NORMAL;
        _ads62p48_regs.power_down = ads62p48_regs_t::POWER_DOWN_NORMAL;
        _ads62p48_regs.lvds_cmos = ads62p48_regs_t::LVDS_CMOS_DDR_LVDS;
        _ads62p48_regs.channel_control = ads62p48_regs_t::CHANNEL_CONTROL_INDEPENDENT;
        _ads62p48_regs.data_format = ads62p48_regs_t::DATA_FORMAT_2S_COMPLIMENT;
        _ads62p48_regs.clk_out_pos_edge = ads62p48_regs_t::CLK_OUT_POS_EDGE_MINUS4_26;
        _ads62p48_regs.clk_out_neg_edge = ads62p48_regs_t::CLK_OUT_NEG_EDGE_MINUS4_26;


        this->send_ads62p48_reg(0);
        this->send_ads62p48_reg(0x20);
        this->send_ads62p48_reg(0x3f);
        this->send_ads62p48_reg(0x40);
        this->send_ads62p48_reg(0x41);
        this->send_ads62p48_reg(0x44);
        this->send_ads62p48_reg(0x50);
        this->send_ads62p48_reg(0x51);
        this->send_ads62p48_reg(0x52);
        this->send_ads62p48_reg(0x53);
        this->send_ads62p48_reg(0x55);
        this->send_ads62p48_reg(0x57);
        this->send_ads62p48_reg(0x62);
        this->send_ads62p48_reg(0x63);
        this->send_ads62p48_reg(0x66);
        this->send_ads62p48_reg(0x68);
        this->send_ads62p48_reg(0x6a);
        this->send_ads62p48_reg(0x75);
        this->send_ads62p48_reg(0x76);

    }

    void reset()
    {
        init();
    }

    double set_gain(const double &gain)
    {
        const meta_range_t gain_range = meta_range_t(0, 6.0, 0.5);
        const int gain_bits = int((gain_range.clip(gain)*2.0) + 0.5);
        _ads62p48_regs.gain_chA = gain_bits;
        _ads62p48_regs.gain_chB = gain_bits;
        this->send_ads62p48_reg(0x55);
        this->send_ads62p48_reg(0x68);
        return gain_bits/2;
    }

    void set_test_word(const std::string &patterna, const std::string &patternb, const uint32_t num)
    {
        _ads62p48_regs.custom_pattern_low = num & 0xff;
        _ads62p48_regs.custom_pattern_high = num >> 8;
        if (patterna == "ones") _ads62p48_regs.test_patterns_chA = ads62p48_regs_t::TEST_PATTERNS_CHA_ONES;
        if (patterna == "zeros") _ads62p48_regs.test_patterns_chA = ads62p48_regs_t::TEST_PATTERNS_CHA_ZEROS;
        if (patterna == "custom") _ads62p48_regs.test_patterns_chA = ads62p48_regs_t::TEST_PATTERNS_CHA_CUSTOM;
        if (patterna == "ramp") _ads62p48_regs.test_patterns_chA = ads62p48_regs_t::TEST_PATTERNS_CHA_RAMP;
        if (patterna == "normal") _ads62p48_regs.test_patterns_chA = ads62p48_regs_t::TEST_PATTERNS_CHA_NORMAL;
        if (patternb == "ones") _ads62p48_regs.test_patterns_chB = ads62p48_regs_t::TEST_PATTERNS_CHB_ONES;
        if (patternb == "zeros") _ads62p48_regs.test_patterns_chB = ads62p48_regs_t::TEST_PATTERNS_CHB_ZEROS;
        if (patternb == "custom") _ads62p48_regs.test_patterns_chB = ads62p48_regs_t::TEST_PATTERNS_CHB_CUSTOM;
        if (patterna == "ramp") _ads62p48_regs.test_patterns_chB = ads62p48_regs_t::TEST_PATTERNS_CHB_RAMP;
        if (patterna == "normal") _ads62p48_regs.test_patterns_chB = ads62p48_regs_t::TEST_PATTERNS_CHB_NORMAL;
        this->send_ads62p48_reg(0x51);
        this->send_ads62p48_reg(0x52);
        this->send_ads62p48_reg(0x62);
        this->send_ads62p48_reg(0x75);
    }

    ~x300_adc_ctrl_impl(void)
    {
        _ads62p48_regs.power_down = ads62p48_regs_t::POWER_DOWN_GLOBAL;
        UHD_SAFE_CALL
        (
            this->send_ads62p48_reg(0x40);
        )
    }

private:
    ads62p48_regs_t _ads62p48_regs;
    uhd::spi_iface::sptr _iface;
    const size_t _slaveno;

    void send_ads62p48_reg(uint8_t addr)
    {
        uint16_t reg = _ads62p48_regs.get_write_reg(addr);
        _iface->write_spi(_slaveno, spi_config_t::EDGE_FALL, reg, 16);
    }
};

/***********************************************************************
 * Public make function for the ADC control
 **********************************************************************/
x300_adc_ctrl::sptr x300_adc_ctrl::make(uhd::spi_iface::sptr iface, const size_t slaveno)
{
    return sptr(new x300_adc_ctrl_impl(iface, slaveno));
}