Initial firmware commit.

firmware/application/si5351.cpp

@@ -0,0 +1,106 @@
+/*
+ * 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 */