portapack-mayhem/firmware/application/hw/max2839.cpp

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/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
* Copyright (C) 2023 Great Scott Gadgets
*
* 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 "max2839.hpp"
#include "hackrf_hal.hpp"
#include "hackrf_gpio.hpp"
using namespace hackrf::one;
#include "ch.h"
#include "hal.h"
#include <algorithm>
namespace max2839 {
namespace lna {
using namespace max283x::lna;
constexpr std::array<uint8_t, 8> lookup_8db_steps {
0b11, 0b11, 0b10, 0b10,
0b01, 0b00, 0b00, 0b00
};
static uint_fast8_t gain_ordinal(const int8_t db) {
const auto db_sat = gain_db_range.clip(db);
return lna::lookup_8db_steps[(db_sat >> 3) & 7];
}
} /* namespace lna */
namespace vga {
using namespace max283x::vga;
constexpr range_t<int8_t> gain_db_range_internal { 0, 63 };
static uint_fast8_t gain_ordinal(const int8_t db) {
const auto db_sat = gain_db_range_internal.clip(db);
return (db_sat & 0b111111) ^ 0b111111;
}
} /* namespace vga */
namespace tx {
using namespace max283x::tx;
static uint_fast8_t gain_ordinal(const int8_t db) {
const auto db_sat = gain_db_range.clip(db);
return 47 - db_sat;
}
} /* namespace tx */
namespace filter {
using namespace max283x::filter;
static uint_fast8_t bandwidth_ordinal(const uint32_t bandwidth) {
/* Determine filter setting that will provide bandwidth greater than or
* equal to requested bandwidth.
*/
return std::lower_bound(bandwidths.cbegin(), bandwidths.cend(), bandwidth) - bandwidths.cbegin();
}
} /* namespace filter */
/* Empirical testing indicates about 25us is necessary to get a valid
* temperature sense conversion from the ADC.
*/
constexpr float seconds_for_temperature_sense_adc_conversion = 30.0e-6;
constexpr halrtcnt_t ticks_for_temperature_sense_adc_conversion = (base_m4_clk_f * seconds_for_temperature_sense_adc_conversion + 1);
constexpr uint32_t reference_frequency = max283x_reference_f;
constexpr uint32_t pll_factor = 1.0 / (4.0 / 3.0 / reference_frequency) + 0.5;
static int_fast8_t requested_rx_lna_gain = 0;
static int_fast8_t requested_rx_vga_gain = 0;
void MAX2839::init() {
set_mode(Mode::Shutdown);
gpio_max283x_enable.output();
gpio_max2839_rxtx.output();
_map.r.rxrf_1.MIMOmode = 1; /* enable RXINB */
_map.r.pa_drv.TXVGA_GAIN_SPI_EN = 1;
_map.r.tx_gain.TXVGA_GAIN_SPI = 0x00;
_map.r.hpfsm_3.HPC_STOP = 1; /* 1kHz */
_map.r.rxrf_2.LNAgain_SPI_EN = 1; /* control LNA gain from SPI */
_map.r.lpf_vga_1.L = 0b000;
_map.r.lpf_vga_2.L = 0b000;
_map.r.rx_top_1.VGAgain_SPI_EN = 1; /* control VGA gain from SPI */
_map.r.lpf_vga_1.VGA = 0b000000;
_map.r.lpf_vga_2.VGA = 0b010101;
_map.r.lpf_vga_2.BUFF_VCM = 0b11; /* maximum RX output common-mode voltage */
_map.r.lpf_vga_1.ModeCtrl = 0b01; /* Rx LPF */
_map.r.lpf.FT = 0b0000; /* 1.75 MHz LPF */
_map.r.spi_en.EN_SPI = 1; /* enable chip functions when ENABLE pin set */
_map.r.lo_gen.LOGEN_2GM = 0;
_map.r.rssi_vga.RSSI_MODE = 1; /* RSSI independent of RXHP */
/*
* There are two LNA band settings, but we only use one of them.
* Switching to the other one doesn't make the overall spectrum any
* flatter but adds a surprise step in the middle.
*/
_map.r.rxrf_1.LNAband = 0; /* 2.3 - 2.5GHz */
_dirty.set();
flush();
set_mode(Mode::Standby);
}
enum class Mask {
Enable = 0b01,
RxTx = 0b10,
Shutdown = 0b00,
Standby = RxTx,
Receive = Enable | RxTx,
Transmit = Enable,
};
Mask mode_mask(const Mode mode) {
switch (mode) {
case Mode::Standby: return Mask::Standby;
case Mode::Receive: return Mask::Receive;
case Mode::Transmit: return Mask::Transmit;
default: return Mask::Shutdown;
}
}
void MAX2839::set_mode(const Mode mode) {
Mask mask = mode_mask(mode);
gpio_max283x_enable.write(toUType(mask) & toUType(Mask::Enable));
gpio_max2839_rxtx.write(toUType(mask) & toUType(Mask::RxTx));
}
void MAX2839::flush() {
if( _dirty ) {
for(size_t n=0; n<reg_count; n++) {
if( _dirty[n] ) {
write(n, _map.w[n]);
}
}
_dirty.clear();
}
}
void MAX2839::flush_one(const Register reg) {
const auto reg_num = toUType(reg);
write(reg_num, _map.w[reg_num]);
_dirty.clear(reg_num);
}
void MAX2839::write(const address_t reg_num, const reg_t value) {
uint16_t t = (0U << 15) | (reg_num << 10) | (value & 0x3ffU);
_target.transfer(&t, 1);
}
reg_t MAX2839::read(const address_t reg_num) {
uint16_t t = (1U << 15) | (reg_num << 10);
_target.transfer(&t, 1U);
return t & 0x3ffU;
}
void MAX2839::write(const Register reg, const reg_t value) {
write(toUType(reg), value);
}
reg_t MAX2839::read(const Register reg) {
return read(toUType(reg));
}
void MAX2839::set_tx_vga_gain(const int_fast8_t db) {
_map.r.tx_gain.TXVGA_GAIN_SPI = tx::gain_ordinal(db);
_dirty[Register::TX_GAIN] = 1;
flush();
}
/*
* MAX2839 gain rain ranges differ slightly from MAX2837's but are close
* enough that it makes sense to emulate MAX2837 gain ranges for a consistent
* user experience.
*/
void MAX2839::configure_rx_gain() {
/* Apply MAX2837 restrictions to requested gain settings. */
int_fast8_t lna_gain = lna::gain_db_range.clip(requested_rx_lna_gain);
lna_gain &= 0x38;
int_fast8_t vga_gain = vga::gain_db_range.clip(requested_rx_vga_gain);
vga_gain &= 0x3e;
/*
* MAX2839 has lower full-scale RX output voltage than MAX2837, so we
* adjust the VGA (baseband) gain to compensate.
*/
vga_gain += 3;
/*
* If that adjustment puts VGA gain out of range, use LNA gain to
* compensate. MAX2839 VGA gain can be any number from 0 through 63.
*/
if (vga_gain > 63) {
if (lna_gain <= 32) {
vga_gain -= 8;
lna_gain += 8;
} else {
vga_gain = 63;
}
}
/*
* MAX2839 lacks max-24 dB (16 dB) and max-40 dB (0 dB) LNA gain
* settings, so we use VGA gain to compensate.
*/
if (lna_gain == 0) {
lna_gain = 8;
vga_gain = (vga_gain >= 8) ? vga_gain - 8 : 0;
}
if (lna_gain == 16) {
if (vga_gain > 32) {
vga_gain -= 8;
lna_gain += 8;
} else {
vga_gain += 8;
lna_gain -= 8;
}
}
_map.r.lpf_vga_2.L = lna::gain_ordinal(lna_gain);
_dirty[Register::RXRF_2] = 1;
_map.r.lpf_vga_2.VGA = vga::gain_ordinal(vga_gain);
_dirty[Register::LPF_VGA_2] = 1;
flush();
}
void MAX2839::set_lna_gain(const int_fast8_t db) {
requested_rx_lna_gain = db;
configure_rx_gain();
}
void MAX2839::set_vga_gain(const int_fast8_t db) {
requested_rx_vga_gain = db;
configure_rx_gain();
}
void MAX2839::set_lpf_rf_bandwidth(const uint32_t bandwidth_minimum) {
_map.r.lpf.FT = filter::bandwidth_ordinal(bandwidth_minimum);
_dirty[Register::LPF] = 1;
flush();
}
bool MAX2839::set_frequency(const rf::Frequency lo_frequency) {
/* TODO: This is a sad implementation. Refactor. */
if( lo::band[0].contains(lo_frequency) ) {
_map.r.syn_int_div.LOGEN_BSW = 0b00; /* 2300 - 2399.99MHz */
} else if( lo::band[1].contains(lo_frequency) ) {
_map.r.syn_int_div.LOGEN_BSW = 0b01; /* 2400 - 2499.99MHz */
} else if( lo::band[2].contains(lo_frequency) ) {
_map.r.syn_int_div.LOGEN_BSW = 0b10; /* 2500 - 2599.99MHz */
} else if( lo::band[3].contains(lo_frequency) ) {
_map.r.syn_int_div.LOGEN_BSW = 0b11; /* 2600 - 2700Hz */
} else {
return false;
}
_dirty[Register::SYN_INT_DIV] = 1;
const uint64_t div_q20 = (lo_frequency * (1 << 20)) / pll_factor;
_map.r.syn_int_div.SYN_INTDIV = div_q20 >> 20;
_dirty[Register::SYN_INT_DIV] = 1;
_map.r.syn_fr_div_2.SYN_FRDIV_19_10 = (div_q20 >> 10) & 0x3ff;
_dirty[Register::SYN_FR_DIV_2] = 1;
/* flush to commit high FRDIV first, as low FRDIV commits the change */
flush();
_map.r.syn_fr_div_1.SYN_FRDIV_9_0 = (div_q20 & 0x3ff);
_dirty[Register::SYN_FR_DIV_1] = 1;
flush();
return true;
}
void MAX2839::set_rx_lo_iq_calibration(const size_t v) {
_map.r.rxrf_2.RX_IQERR_SPI_EN = 1;
_dirty[Register::RXRF_2] = 1;
_map.r.rxrf_1.iqerr_trim = v;
_dirty[Register::RXRF_1] = 1;
flush();
}
void MAX2839::set_rx_buff_vcm(const size_t v) {
_map.r.lpf_vga_2.BUFF_VCM = v;
_dirty[Register::LPF_VGA_2] = 1;
flush();
}
reg_t MAX2839::temp_sense() {
if( !_map.r.rx_top_2.ts_en ) {
_map.r.rx_top_2.ts_en = 1;
flush_one(Register::RX_TOP_2);
chThdSleepMilliseconds(1);
}
_map.r.rx_top_2.ts_adc_trigger = 1;
flush_one(Register::RX_TOP_2);
halPolledDelay(ticks_for_temperature_sense_adc_conversion);
/*
* Things look very similar to MAX2837, so this probably works, but the
* MAX2839 data sheet does not describe the TEMP_SENSE register contents.
*/
const auto value = read(Register::TEMP_SENSE);
_map.r.rx_top_2.ts_adc_trigger = 0;
flush_one(Register::RX_TOP_2);
return value;
}
}