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93585d846a
portapack-mayhem/firmware/application/clock_manager.cpp
Mark Thompson 93585d846a
CLKOUT workaround for r9 boards (#1671)
2023-12-24 11:06:11 +01:00

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/*
* 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 "clock_manager.hpp"
#include "portapack_persistent_memory.hpp"
#include "portapack_io.hpp"
#include "hackrf_hal.hpp"
using namespace hackrf::one;
#include "lpc43xx_cpp.hpp"
using namespace lpc43xx;
constexpr uint32_t si5351_vco_f = 800000000;
constexpr si5351::Inputs si5351_inputs{
.f_xtal = si5351_xtal_f,
.f_clkin = si5351_clkin_f,
.clkin_div = 1,
};
static_assert(si5351_inputs.f_xtal == si5351_xtal_f, "XTAL output frequency wrong");
static_assert(si5351_inputs.f_clkin_out() == si5351_clkin_f, "CLKIN output frequency wrong");
constexpr si5351::PLLInputSource::Type si5351c_pll_input_sources{
si5351::PLLInputSource::PLLA_Source_XTAL | si5351::PLLInputSource::PLLB_Source_CLKIN | si5351::PLLInputSource::CLKIN_Div1};
constexpr si5351::PLLInputSource::Type si5351a_pll_input_sources{
si5351::PLLInputSource::PLLA_Source_XTAL | si5351::PLLInputSource::PLLB_Source_XTAL | si5351::PLLInputSource::CLKIN_Div1};
constexpr si5351::PLL si5351_pll_xtal_25m{
.f_in = si5351_inputs.f_xtal,
.a = 32,
.b = 0,
.c = 1,
};
constexpr auto si5351_pll_a_xtal_reg = si5351_pll_xtal_25m.reg(0);
constexpr si5351::PLL si5351_pll_clkin_10m{
.f_in = si5351_inputs.f_clkin_out(),
.a = 80,
.b = 0,
.c = 1,
};
constexpr auto si5351c_pll_b_clkin_reg = si5351_pll_clkin_10m.reg(1);
constexpr auto si5351a_pll_a_clkin_reg = si5351_pll_clkin_10m.reg(0);
static_assert(si5351_pll_xtal_25m.f_vco() == si5351_vco_f, "PLL XTAL frequency wrong");
static_assert(si5351_pll_xtal_25m.p1() == 3584, "PLL XTAL P1 wrong");
static_assert(si5351_pll_xtal_25m.p2() == 0, "PLL XTAL P2 wrong");
static_assert(si5351_pll_xtal_25m.p3() == 1, "PLL XTAL P3 wrong");
static_assert(si5351_pll_clkin_10m.f_vco() == si5351_vco_f, "PLL CLKIN frequency wrong");
static_assert(si5351_pll_clkin_10m.p1() == 9728, "PLL CLKIN P1 wrong");
static_assert(si5351_pll_clkin_10m.p2() == 0, "PLL CLKIN P2 wrong");
static_assert(si5351_pll_clkin_10m.p3() == 1, "PLL CLKIN P3 wrong");
/*
constexpr si5351::MultisynthFractional si5351_ms_18m432 {
.f_src = si5351_vco_f,
.a = 43,
.b = 29,
.c = 72,
.r_div = 1,
};
*/
/*
constexpr si5351::MultisynthFractional si5351_ms_0_20m {
.f_src = si5351_vco_f,
.a = 20,
.b = 0,
.c = 1,
.r_div = 1,
};
constexpr auto si5351_ms_0_20m_reg = si5351_ms_0_20m.reg(0);
*/
constexpr si5351::MultisynthFractional si5351_ms_0_8m{
.f_src = si5351_vco_f,
.a = 50,
.b = 0,
.c = 1,
.r_div = 1,
};
constexpr auto si5351c_ms_0_8m_reg = si5351_ms_0_8m.reg(clock_generator_output_og_codec);
constexpr si5351::MultisynthFractional si5351_ms_group{
.f_src = si5351_vco_f,
.a = 80, /* Don't care */
.b = 0,
.c = 1,
.r_div = 0,
};
constexpr auto si5351c_ms_1_group_reg = si5351_ms_group.reg(clock_generator_output_og_cpld);
constexpr auto si5351c_ms_2_group_reg = si5351_ms_group.reg(clock_generator_output_og_sgpio);
constexpr si5351::MultisynthFractional si5351_ms_16m{
.f_src = si5351_vco_f,
.a = 50,
.b = 0,
.c = 1,
.r_div = 0,
};
constexpr auto si5351a_ms_1_sgpio_16m_reg = si5351_ms_16m.reg(clock_generator_output_r9_sgpio);
constexpr si5351::MultisynthFractional si5351_ms_10m{
.f_src = si5351_vco_f,
.a = 80,
.b = 0,
.c = 1,
.r_div = 0,
};
constexpr auto si5351c_ms_3_10m_reg = si5351_ms_10m.reg(3);
constexpr auto si5351a_ms_2_mcu_10m_reg = si5351_ms_10m.reg(clock_generator_output_r9_mcu_clkin);
constexpr si5351::MultisynthFractional si5351_ms_40m{
.f_src = si5351_vco_f,
.a = 20,
.b = 0,
.c = 1,
.r_div = 0,
};
constexpr auto si5351_ms_rffc5072 = si5351_ms_40m;
constexpr auto si5351_ms_max283x = si5351_ms_40m;
constexpr auto si5351c_ms_4_reg = si5351_ms_rffc5072.reg(clock_generator_output_og_first_if);
constexpr auto si5351c_ms_5_reg = si5351_ms_max283x.reg(clock_generator_output_og_second_if);
constexpr auto si5351a_ms_0_if_40m_reg = si5351_ms_40m.reg(clock_generator_output_r9_if);
static_assert(si5351_ms_10m.f_out() == 10000000, "MS 10MHz f_out wrong");
static_assert(si5351_ms_10m.p1() == 9728, "MS 10MHz p1 wrong");
static_assert(si5351_ms_10m.p2() == 0, "MS 10MHz p2 wrong");
static_assert(si5351_ms_10m.p3() == 1, "MS 10MHz p3 wrong");
static_assert(si5351_ms_rffc5072.f_out() == rffc5072_reference_f, "RFFC5072 reference f_out wrong");
static_assert(si5351_ms_max283x.f_out() == max283x_reference_f, "MAX283x reference f_out wrong");
constexpr si5351::MultisynthInteger si5351_ms_int_off{
.f_src = si5351_vco_f,
.a = 255,
.r_div = 0,
};
constexpr si5351::MultisynthInteger si5351_ms_int_40m{
.f_src = si5351_vco_f,
.a = 20,
.r_div = 0,
};
constexpr si5351::MultisynthInteger si5351_ms_int_10m{
.f_src = si5351_vco_f,
.a = 80,
.r_div = 0,
};
constexpr auto si5351c_ms_int_mcu_clkin = si5351_ms_int_40m;
constexpr auto si5351a_ms_int_mcu_clkin = si5351_ms_int_10m;
constexpr auto si5351c_ms6_7_off_mcu_clkin_reg = si5351::ms6_7_reg(si5351_ms_int_off, si5351c_ms_int_mcu_clkin);
constexpr auto si5351a_ms6_7_off_reg = si5351::ms6_7_reg(si5351_ms_int_off, si5351_ms_int_off);
static_assert(si5351_ms_int_off.f_out() == 3137254, "MS int off f_out wrong");
static_assert(si5351_ms_int_off.p1() == 255, "MS int off P1 wrong");
static_assert(si5351c_ms_int_mcu_clkin.f_out() == mcu_clkin_og_f, "MS int MCU CLKIN OG f_out wrong");
static_assert(si5351a_ms_int_mcu_clkin.f_out() == mcu_clkin_r9_f, "MS int MCU CLKIN r9 f_out wrong");
using namespace si5351;
static constexpr ClockControl::MultiSynthSource get_si5351c_reference_clock_generator_pll(const ClockManager::ReferenceSource reference_source) {
return (reference_source == ClockManager::ReferenceSource::Xtal)
? ClockControl::MultiSynthSource::PLLA
: ClockControl::MultiSynthSource::PLLB;
}
constexpr ClockControls si5351c_clock_control_common{{
{ClockControl::ClockCurrentDrive::_8mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, get_si5351c_reference_clock_generator_pll(ClockManager::ReferenceSource::Xtal), ClockControl::MultiSynthMode::Fractional, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_2mA, ClockControl::ClockSource::MS_Group, ClockControl::ClockInvert::Invert, get_si5351c_reference_clock_generator_pll(ClockManager::ReferenceSource::Xtal), ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_2mA, ClockControl::ClockSource::MS_Group, ClockControl::ClockInvert::Normal, get_si5351c_reference_clock_generator_pll(ClockManager::ReferenceSource::Xtal), ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_8mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, get_si5351c_reference_clock_generator_pll(ClockManager::ReferenceSource::Xtal), ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_6mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Invert, get_si5351c_reference_clock_generator_pll(ClockManager::ReferenceSource::Xtal), ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_4mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, get_si5351c_reference_clock_generator_pll(ClockManager::ReferenceSource::Xtal), ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_2mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, get_si5351c_reference_clock_generator_pll(ClockManager::ReferenceSource::Xtal), ClockControl::MultiSynthMode::Fractional, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_2mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, get_si5351c_reference_clock_generator_pll(ClockManager::ReferenceSource::Xtal), ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
}};
constexpr ClockControls si5351a_clock_control_common{{
{ClockControl::ClockCurrentDrive::_6mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, ClockControl::MultiSynthSource::PLLA, ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_4mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, ClockControl::MultiSynthSource::PLLA, ClockControl::MultiSynthMode::Fractional, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_8mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, ClockControl::MultiSynthSource::PLLA, ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_2mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, ClockControl::MultiSynthSource::PLLA, ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_2mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, ClockControl::MultiSynthSource::PLLA, ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_2mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, ClockControl::MultiSynthSource::PLLA, ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_2mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, ClockControl::MultiSynthSource::PLLA, ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
{ClockControl::ClockCurrentDrive::_2mA, ClockControl::ClockSource::MS_Self, ClockControl::ClockInvert::Normal, ClockControl::MultiSynthSource::PLLA, ClockControl::MultiSynthMode::Integer, ClockControl::ClockPowerDown::Power_Off},
}};
ClockManager::Reference ClockManager::get_reference() const {
return reference;
}
static void portapack_tcxo_enable() {
portapack::io.reference_oscillator(true);
/* Delay >10ms at 96MHz clock speed for reference oscillator to start. */
/* Delay an additional 1ms (arbitrary) for the clock generator to detect a signal. */
volatile uint32_t delay = 240000 + 24000;
while (delay--)
;
}
static void portapack_tcxo_disable() {
portapack::io.reference_oscillator(false);
}
#include "hackrf_gpio.hpp"
using namespace hackrf::one;
void ClockManager::init_clock_generator() {
clock_generator.reset();
clock_generator.set_crystal_internal_load_capacitance(CrystalInternalLoadCapacitance::XTAL_CL_8pF);
clock_generator.enable_fanout();
clock_generator.set_pll_input_sources(hackrf_r9
? si5351a_pll_input_sources
: si5351c_pll_input_sources);
auto si5351_clock_control_common = hackrf_r9
? si5351a_clock_control_common
: si5351c_clock_control_common;
auto clock_generator_output_mcu_clkin = hackrf_r9
? clock_generator_output_r9_mcu_clkin
: clock_generator_output_og_mcu_clkin;
clock_generator.set_clock_control(
clock_generator_output_mcu_clkin,
si5351_clock_control_common[clock_generator_output_mcu_clkin]
.clk_src(hackrf_r9
? ClockControl::ClockSource::Xtal
: ClockControl::ClockSource::CLKIN)
.clk_pdn(ClockControl::ClockPowerDown::Power_On));
clock_generator.enable_output(clock_generator_output_mcu_clkin);
reference = choose_reference();
clock_generator.disable_output(clock_generator_output_mcu_clkin);
const auto ref_pll = hackrf_r9
? ClockControl::MultiSynthSource::PLLA
: get_si5351c_reference_clock_generator_pll(reference.source);
const ClockControls si5351_clock_control = ClockControls{{
si5351_clock_control_common[0].ms_src(ref_pll),
si5351_clock_control_common[1].ms_src(ref_pll),
si5351_clock_control_common[2].ms_src(ref_pll),
si5351_clock_control_common[3].ms_src(ref_pll),
si5351_clock_control_common[4].ms_src(ref_pll),
si5351_clock_control_common[5].ms_src(ref_pll),
si5351_clock_control_common[6].ms_src(ref_pll),
si5351_clock_control_common[7].ms_src(ref_pll),
}};
clock_generator.set_clock_control(si5351_clock_control);
if (hackrf_r9) {
const PLLReg pll_reg = (reference.source == ReferenceSource::Xtal)
? si5351_pll_a_xtal_reg
: si5351a_pll_a_clkin_reg;
clock_generator.write(pll_reg);
clock_generator.write(si5351a_ms_0_if_40m_reg);
clock_generator.write(si5351a_ms_1_sgpio_16m_reg);
clock_generator.write(si5351a_ms_2_mcu_10m_reg);
clock_generator.write(si5351a_ms6_7_off_reg);
} else {
clock_generator.write(si5351_pll_a_xtal_reg);
clock_generator.write(si5351c_pll_b_clkin_reg);
clock_generator.write(si5351c_ms_0_8m_reg);
clock_generator.write(si5351c_ms_1_group_reg);
clock_generator.write(si5351c_ms_2_group_reg);
clock_generator.write(si5351c_ms_3_10m_reg);
clock_generator.write(si5351c_ms_4_reg);
clock_generator.write(si5351c_ms_5_reg);
clock_generator.write(si5351c_ms6_7_off_mcu_clkin_reg);
}
clock_generator.reset_plls();
// Wait for PLL(s) to lock.
uint8_t device_status_mask = hackrf_r9
? 0x20
: (ref_pll == ClockControl::MultiSynthSource::PLLB)
? 0x40
: 0x20;
while ((clock_generator.device_status() & device_status_mask) != 0)
;
clock_generator.set_clock_control(
clock_generator_output_mcu_clkin,
si5351_clock_control_common[clock_generator_output_mcu_clkin].ms_src(ref_pll).clk_pdn(ClockControl::ClockPowerDown::Power_On));
clock_generator.enable_output(clock_generator_output_mcu_clkin);
}
uint32_t ClockManager::measure_gp_clkin_frequency() {
// Measure Si5351B CLKIN frequency against LPC43xx IRC oscillator
start_frequency_monitor_measurement(cgu::CLK_SEL::GP_CLKIN);
wait_For_frequency_monitor_measurement_done();
return get_frequency_monitor_measurement_in_hertz();
}
bool ClockManager::loss_of_signal() {
if (hackrf_r9) {
const auto frequency = measure_gp_clkin_frequency();
return (frequency < 9850000) || (frequency > 10150000);
} else {
return clock_generator.clkin_loss_of_signal();
}
}
ClockManager::ReferenceSource ClockManager::detect_reference_source() {
if (portapack::persistent_memory::config_disable_external_tcxo())
return ReferenceSource::Xtal;
if (loss_of_signal()) {
// No external reference. Turn on PortaPack reference (if present).
portapack_tcxo_enable();
if (loss_of_signal()) {
// No PortaPack reference was detected. Choose the HackRF crystal as the reference.
return ReferenceSource::Xtal;
} else {
return ReferenceSource::PortaPack;
}
} else {
return ReferenceSource::External;
}
}
ClockManager::Reference ClockManager::choose_reference() {
if (hackrf_r9) {
gpio_r9_clkin_en.write(1);
volatile uint32_t delay = 240000 + 24000;
while (delay--)
;
}
const auto detected_reference = detect_reference_source();
if ((detected_reference == ReferenceSource::External) ||
(detected_reference == ReferenceSource::PortaPack)) {
const auto frequency = measure_gp_clkin_frequency();
if ((frequency >= 9850000) && (frequency <= 10150000)) {
return {detected_reference, 10000000};
}
}
if (hackrf_r9) {
gpio_r9_clkin_en.write(0);
}
portapack_tcxo_disable();
return {ReferenceSource::Xtal, 25000000};
}
void ClockManager::shutdown() {
clock_generator.reset();
}
void ClockManager::enable_codec_clocks() {
if (hackrf_r9) {
clock_generator.enable_clock(clock_generator_output_r9_sgpio);
} else {
clock_generator.enable_clock(clock_generator_output_og_codec);
clock_generator.enable_clock(clock_generator_output_og_cpld);
clock_generator.enable_clock(clock_generator_output_og_sgpio);
}
/* Turn on all outputs at the same time. This probably doesn't ensure
* their phase relationships. For example, clocks that output frequencies
* in a 2:1 relationship may start with the slower clock high or low?
*/
if (hackrf_r9) {
clock_generator.enable_output_mask(1U << clock_generator_output_r9_sgpio);
} else {
clock_generator.enable_output_mask(
(1U << clock_generator_output_og_codec) | (1U << clock_generator_output_og_cpld) | (1U << clock_generator_output_og_sgpio));
}
}
void ClockManager::disable_codec_clocks() {
/* Turn off outputs before disabling clocks. It seems the clock needs to
* be enabled for the output to come to rest at the state specified by
* CLKx_DISABLE_STATE.
*/
if (hackrf_r9) {
clock_generator.disable_output_mask(1U << clock_generator_output_r9_sgpio);
clock_generator.disable_clock(clock_generator_output_r9_sgpio);
} else {
clock_generator.disable_output_mask(
(1U << clock_generator_output_og_codec) | (1U << clock_generator_output_og_cpld) | (1U << clock_generator_output_og_sgpio));
clock_generator.disable_clock(clock_generator_output_og_codec);
clock_generator.disable_clock(clock_generator_output_og_cpld);
clock_generator.disable_clock(clock_generator_output_og_sgpio);
}
}
void ClockManager::enable_if_clocks() {
if (hackrf_r9) {
clock_generator.enable_clock(clock_generator_output_r9_if);
clock_generator.enable_output_mask(1U << clock_generator_output_r9_if);
} else {
clock_generator.enable_clock(clock_generator_output_og_first_if);
clock_generator.enable_output_mask(1U << clock_generator_output_og_first_if);
clock_generator.enable_clock(clock_generator_output_og_second_if);
clock_generator.enable_output_mask(1U << clock_generator_output_og_second_if);
}
}
void ClockManager::disable_if_clocks() {
if (hackrf_r9) {
clock_generator.disable_output_mask(1U << clock_generator_output_r9_if);
clock_generator.disable_clock(clock_generator_output_r9_if);
} else {
clock_generator.disable_output_mask(1U << clock_generator_output_og_first_if);
clock_generator.disable_clock(clock_generator_output_og_first_if);
clock_generator.disable_output_mask(1U << clock_generator_output_og_second_if);
clock_generator.disable_clock(clock_generator_output_og_second_if);
}
}
void ClockManager::set_sampling_frequency(const uint32_t frequency) {
/* Codec clock is at sampling frequency, CPLD and SGPIO clocks are at
* twice the frequency, and derived from the MS0 synth. So it's only
* necessary to change the MS0 synth frequency, and ensure the output
* is divided by two.
*/
if (hackrf_r9) {
clock_generator.set_ms_frequency(clock_generator_output_r9_sgpio, frequency * 2, si5351_vco_f, 0);
} else {
clock_generator.set_ms_frequency(clock_generator_output_og_codec, frequency * 2, si5351_vco_f, 1);
}
}
void ClockManager::set_reference_ppb(const int32_t ppb) {
/* NOTE: This adjustment only affects PLLA when it is derived from the 25MHz crystal.
* It is assumed an external clock coming in to CLKIN/PLLB is sufficiently accurate as to not need adjustment.
* TODO: Revisit the above policy. It may be good to allow adjustment of the external reference too.
*/
if (hackrf_r9 && reference.source != ReferenceSource::Xtal) {
return;
}
constexpr uint32_t pll_multiplier = si5351_pll_xtal_25m.a;
constexpr uint32_t denominator = 1000000 / pll_multiplier;
const uint32_t new_a = (ppb >= 0) ? pll_multiplier : (pll_multiplier - 1);
const uint32_t new_b = (ppb >= 0) ? (ppb / 1000) : (denominator + (ppb / 1000));
const uint32_t new_c = (ppb == 0) ? 1 : denominator;
const si5351::PLL pll{
.f_in = si5351_inputs.f_xtal,
.a = new_a,
.b = new_b,
.c = new_c,
};
const auto pll_a_reg = pll.reg(0);
clock_generator.write(pll_a_reg);
}
void ClockManager::start_frequency_monitor_measurement(const cgu::CLK_SEL clk_sel) {
// Measure a clock input for 480 cycles of the LPC43xx IRC.
LPC_CGU->FREQ_MON = LPC_CGU_FREQ_MON_Type{
.RCNT = 480,
.FCNT = 0,
.MEAS = 0,
.CLK_SEL = toUType(clk_sel),
.RESERVED0 = 0};
LPC_CGU->FREQ_MON.MEAS = 1;
}
void ClockManager::wait_For_frequency_monitor_measurement_done() {
// FREQ_MON mechanism fails to finish if there's no clock present on selected input?!
while (LPC_CGU->FREQ_MON.MEAS == 1)
;
}
uint32_t ClockManager::get_frequency_monitor_measurement_in_hertz() {
// Measurement is only as accurate as the LPC43xx IRC oscillator,
// which is +/- 1.5%. Measurement is for 480 IRC clcocks. Scale
// the cycle count to get a value in Hertz.
return LPC_CGU->FREQ_MON.FCNT * 25000;
}
void ClockManager::start_audio_pll() {
cgu::pll0audio::ctrl({
.pd = 1,
.bypass = 0,
.directi = 0,
.directo = 0,
.clken = 0,
.frm = 0,
.autoblock = 1,
.pllfract_req = 0,
.sel_ext = 1,
.mod_pd = 1,
.clk_sel = cgu::CLK_SEL::GP_CLKIN,
});
/* For 40MHz clock source, 48kHz audio rate, 256Fs MCLK:
* Fout=12.288MHz, Fcco=491.52MHz
* OG: PSEL=20, NSEL=125, MSEL=768
* PDEC=31, NDEC=45, MDEC=30542
* r9: PSEL=20, NSEL=125, MSEL=3072
* PDEC=31, NDEC=45, MDEC=8308
*/
cgu::pll0audio::mdiv({
.mdec = hackrf_r9 ? 8308UL : 30542UL,
});
cgu::pll0audio::np_div({
.pdec = 31,
.ndec = 45,
});
cgu::pll0audio::frac({
.pllfract_ctrl = 0,
});
cgu::pll0audio::power_up();
while (!cgu::pll0audio::is_locked())
;
cgu::pll0audio::clock_enable();
set_base_audio_clock_divider(1);
LPC_CGU->BASE_AUDIO_CLK.AUTOBLOCK = 1;
LPC_CGU->BASE_AUDIO_CLK.CLK_SEL = toUType(cgu::CLK_SEL::IDIVD);
}
void ClockManager::set_base_audio_clock_divider(const size_t divisor) {
LPC_CGU->IDIVD_CTRL.word =
(0 << 0) | ((divisor - 1) << 2) | (1 << 11) | (toUType(cgu::CLK_SEL::PLL0AUDIO) << 24);
}
void ClockManager::stop_audio_pll() {
cgu::pll0audio::clock_disable();
cgu::pll0audio::power_down();
while (cgu::pll0audio::is_locked())
;
}
void ClockManager::enable_clock_output(bool enable) {
if (hackrf_r9) {
gpio_r9_clkout_en.output();
gpio_r9_clkout_en.write(enable);
// NOTE: RETURNING HERE IF HACKRF_R9 TO PREVENT CLK2 FROM BEING DISABLED OR FREQ MODIFIED SINCE CLK2 ON R9 IS
// USED FOR BOTH CLKOUT AND FOR THE MCU_CLOCK (== GP_CLKIN) WHICH OTHER LP43XX CLOCKS CURRENTLY RELY ON.
// FUTURE TBD: REMOVE OTHER LP43XX CLOCK DEPENDENCIES ON GP_CLKIN, THEN DELETE THE return LINE BELOW TO ALLOW
// CLKOUT FREQ CHANGES ON R9 BOARDS.
return;
}
auto clkout_select = hackrf_r9 ? clock_generator_output_r9_clkout : clock_generator_output_og_clkout;
if (enable) {
clock_generator.enable_output(clkout_select);
if (portapack::persistent_memory::clkout_freq() < 1000) {
clock_generator.set_ms_frequency(clkout_select, portapack::persistent_memory::clkout_freq() * 128000, si5351_vco_f, 7);
} else {
clock_generator.set_ms_frequency(clkout_select, portapack::persistent_memory::clkout_freq() * 1000, si5351_vco_f, 0);
}
auto si5351_clock_control_common = hackrf_r9 ? si5351a_clock_control_common : si5351c_clock_control_common;
const auto ref_pll = hackrf_r9 ? ClockControl::MultiSynthSource::PLLA : get_si5351c_reference_clock_generator_pll(reference.source);
clock_generator.set_clock_control(clkout_select, si5351_clock_control_common[clkout_select].ms_src(ref_pll).clk_pdn(ClockControl::ClockPowerDown::Power_On));
} else {
clock_generator.disable_output(clkout_select);
clock_generator.set_clock_control(clkout_select, ClockControl::power_off());
}
}
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