mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-15 04:28:10 +00:00
107 lines
2.9 KiB
C++
107 lines
2.9 KiB
C++
/*
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* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "si5351.hpp"
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#include "utility.hpp"
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#include <cstdint>
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#include <array>
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namespace si5351 {
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void Si5351::reset() {
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wait_for_device_ready();
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write_register(Register::InterruptStatusSticky, 0x00);
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write_register(Register::InterruptStatusMask, 0xf0);
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update_output_enable_control();
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write_register(Register::OEBPinEnableControlMask, 0xff);
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write_register(Register::PLLInputSource, 0x00);
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_clock_control = {
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ClockControl::CLK_PDN_Power_Off, ClockControl::CLK_PDN_Power_Off,
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ClockControl::CLK_PDN_Power_Off, ClockControl::CLK_PDN_Power_Off,
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ClockControl::CLK_PDN_Power_Off, ClockControl::CLK_PDN_Power_Off,
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ClockControl::CLK_PDN_Power_Off, ClockControl::CLK_PDN_Power_Off
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};
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update_all_clock_control();
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write(std::array<uint8_t, 70> { Register::CLK3_0DisableState });
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write(std::array<uint8_t, 14>{
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Register::SpreadSpectrumParameters_Base
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});
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write(std::array<uint8_t, 4>{
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Register::VCXOParameters_Base
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});
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write(std::array<uint8_t, 7>{
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Register::CLKInitialPhaseOffset_Base
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});
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write_register(Register::CrystalInternalLoadCapacitance, 0b11010010);
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write_register(Register::FanoutEnable, 0x00);
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reset_plls();
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}
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Si5351::regvalue_t Si5351::read_register(const uint8_t reg) {
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const std::array<uint8_t, 1> tx { reg };
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std::array<uint8_t, 1> rx { 0x00 };
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_bus.transmit(_address, tx.data(), tx.size());
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_bus.receive(_address, rx.data(), rx.size());
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return rx[0];
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}
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void Si5351::set_ms_frequency(
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const size_t ms_number,
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const uint32_t frequency,
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const uint32_t vco_frequency,
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const size_t r_div
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) {
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/* TODO: Factor out the VCO frequency, which should be an attribute held
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* by the Si5351 object.
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*/
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const uint32_t a = vco_frequency / frequency;
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const uint32_t remainder = vco_frequency - (frequency * a);
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const uint32_t denom = gcd(remainder, frequency);
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const uint32_t b = remainder / denom;
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const uint32_t c = frequency / denom;
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/* TODO: Switch between integer and fractional modes depending on the
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* values of a and b.
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*/
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const MultisynthFractional ms {
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.f_src = vco_frequency,
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.a = a,
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.b = b,
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.c = c,
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.r_div = r_div,
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};
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const auto regs = ms.reg(ms_number);
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write(regs);
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}
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} /* namespace si5351 */
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