portapack-mayhem/firmware/application/si5351.cpp
2015-07-08 08:39:24 -07:00

107 lines
2.9 KiB
C++

/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* 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 2, 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; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "si5351.hpp"
#include "utility.hpp"
#include <cstdint>
#include <array>
namespace si5351 {
void Si5351::reset() {
wait_for_device_ready();
write_register(Register::InterruptStatusSticky, 0x00);
write_register(Register::InterruptStatusMask, 0xf0);
update_output_enable_control();
write_register(Register::OEBPinEnableControlMask, 0xff);
write_register(Register::PLLInputSource, 0x00);
_clock_control = {
ClockControl::CLK_PDN_Power_Off, ClockControl::CLK_PDN_Power_Off,
ClockControl::CLK_PDN_Power_Off, ClockControl::CLK_PDN_Power_Off,
ClockControl::CLK_PDN_Power_Off, ClockControl::CLK_PDN_Power_Off,
ClockControl::CLK_PDN_Power_Off, ClockControl::CLK_PDN_Power_Off
};
update_all_clock_control();
write(std::array<uint8_t, 70> { Register::CLK3_0DisableState });
write(std::array<uint8_t, 14>{
Register::SpreadSpectrumParameters_Base
});
write(std::array<uint8_t, 4>{
Register::VCXOParameters_Base
});
write(std::array<uint8_t, 7>{
Register::CLKInitialPhaseOffset_Base
});
write_register(Register::CrystalInternalLoadCapacitance, 0b11010010);
write_register(Register::FanoutEnable, 0x00);
reset_plls();
}
Si5351::regvalue_t Si5351::read_register(const uint8_t reg) {
const std::array<uint8_t, 1> tx { reg };
std::array<uint8_t, 1> rx { 0x00 };
_bus.transmit(_address, tx.data(), tx.size());
_bus.receive(_address, rx.data(), rx.size());
return rx[0];
}
void Si5351::set_ms_frequency(
const size_t ms_number,
const uint32_t frequency,
const uint32_t vco_frequency,
const size_t r_div
) {
/* TODO: Factor out the VCO frequency, which should be an attribute held
* by the Si5351 object.
*/
const uint32_t a = vco_frequency / frequency;
const uint32_t remainder = vco_frequency - (frequency * a);
const uint32_t denom = gcd(remainder, frequency);
const uint32_t b = remainder / denom;
const uint32_t c = frequency / denom;
/* TODO: Switch between integer and fractional modes depending on the
* values of a and b.
*/
const MultisynthFractional ms {
.f_src = vco_frequency,
.a = a,
.b = b,
.c = c,
.r_div = r_div,
};
const auto regs = ms.reg(ms_number);
write(regs);
}
} /* namespace si5351 */