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Activating TX Low Pass Filter in Second IF IC (#1470)

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* Activating TX Low Pass Filter in Second IF IC
* solving PR conversation revisions
* Final TX LPF decision for ADSB_TX
* Small comments correction.
* Added set TX LPF also  in APRS, BurgerPgr,Jammer
This commit is contained in:
Brumi-2021 2023-10-08 17:50:31 +02:00 committed by GitHub
parent 5a850984b9
commit defb934c3f
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GPG Key ID: 4AEE18F83AFDEB23
19 changed files with 81 additions and 18 deletions
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2
firmware/application/apps/gps_sim_app.cpp
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@ -173,6 +173,8 @@ GpsSimAppView::GpsSimAppView(
&waterfall,
});
transmitter_model.set_baseband_bandwidth(15'000'000); // GPS L1 signal use to have wide band spectrum, still with lobule energy -30dB's at + - 15 Mhz
if (!settings_.radio_loaded()) {
field_frequency.set_value(initial_target_frequency);
transmitter_model.set_sampling_rate(2600000);

1
firmware/application/apps/soundboard_app.cpp
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@ -120,6 +120,7 @@ void SoundBoardView::start_tx(const uint32_t id) {
);
baseband::set_sample_rate(sample_rate);
transmitter_model.set_baseband_bandwidth(1'750'000); // the Minimum TX LPF 1M75 is fine.
transmitter_model.enable();
tx_view.set_transmitting(true);

4
firmware/application/apps/ui_adsb_tx.cpp
View File

@ -296,6 +296,10 @@ void ADSBTxView::generate_frames() {
void ADSBTxView::start_tx() {
generate_frames();
/* Already tested , with SDR Angel + another Hackrf RX and dump1090 + SDR RLT. Final conclusion is TX LPF 6 Mhz is
* the best settings to fulfill ADSB transponder spectrum mask requirements (<=-20 dB's at +-7Mhz , <=-40 dB's at +-23Mhz )
* and not showing any ADSB data decoding degradation.*/
transmitter_model.set_baseband_bandwidth(6'000'000); // best settings for ADSB TX.
transmitter_model.enable();
baseband::set_adsb();

1
firmware/application/apps/ui_aprs_tx.cpp
View File

@ -57,6 +57,7 @@ void APRSTXView::start_tx() {
// uint8_t * bb_data_ptr = shared_memory.bb_data.data;
// text_payload.set(to_string_hex_array(bb_data_ptr + 56, 15));
transmitter_model.set_baseband_bandwidth(1'750'000); // APRS Automatic Packet Reporting System (APRS).AFSK with NBFM , max BW= 12k5 , then TX LPF min 1M75
transmitter_model.enable();
baseband::set_afsk_data(

1
firmware/application/apps/ui_coasterp.cpp
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@ -67,6 +67,7 @@ void CoasterPagerView::generate_frame() {
void CoasterPagerView::start_tx() {
generate_frame();
transmitter_model.set_baseband_bandwidth(1'750'000); // AFSK narrowband ,low baud, max FM dev 150khz , std 10khz. TX LPF=1M75 the min.
transmitter_model.enable();
baseband::set_fsk_data(19 * 8, 2280000 / 1000, 5000, 32);

4
firmware/application/apps/ui_jammer.cpp
View File

@ -261,6 +261,7 @@ void JammerView::start_tx() {
transmitter_model.set_rf_amp(field_amp.value());
transmitter_model.set_tx_gain(field_gain.value());
transmitter_model.set_baseband_bandwidth(28'000'000); // Although tx is narrowband , let's use Max TX LPF .
transmitter_model.enable();
baseband::set_jammer(true, (JammerType)options_type.selected_index(), options_speed.selected_index_value());
@ -288,7 +289,8 @@ void JammerView::on_timer() {
mscounter = 0;
if (jamming) {
if (cooling) {
if (++seconds >= field_timepause.value()) { // Re-start TX
if (++seconds >= field_timepause.value()) { // Re-start TX
transmitter_model.set_baseband_bandwidth(28'000'000); // Although tx is narrowband , let's use Max TX LPF .
transmitter_model.enable();
button_transmit.set_text("STOP");
baseband::set_jammer(true, (JammerType)options_type.selected_index(), options_speed.selected_index_value());

4
firmware/application/apps/ui_mictx.cpp
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@ -87,6 +87,10 @@ void MicTXView::set_tx(bool enable) {
transmitting = true;
configure_baseband();
transmitter_model.set_target_frequency(tx_frequency); // Now, no need: transmitter_model.set_tx_gain(tx_gain), nor (rf_amp);
/* The max. Power Spectrum Densitiy in WFM with High tone mod level (80%) and high 32kHZ subtone as fmod. with max fdeviation 150k ,
BW aprox = 2 *(150K + 32K) = 364khz, then we just select the minimum TX LPF 1M75. */
transmitter_model.set_baseband_bandwidth(1'750'000);
transmitter_model.enable();
portapack::pin_i2s0_rx_sda.mode(3); // This is already done in audio::init but gets changed by the CPLD overlay reprogramming
} else {

2
firmware/application/apps/ui_playlist.cpp
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@ -273,7 +273,7 @@ void PlaylistView::send_current_track() {
// ReplayThread starts immediately on construction; must be set before creating.
transmitter_model.set_target_frequency(current()->metadata.center_frequency);
transmitter_model.set_sampling_rate(get_actual_sample_rate(current()->metadata.sample_rate));
transmitter_model.set_baseband_bandwidth(baseband_bandwidth);
transmitter_model.set_baseband_bandwidth(current()->metadata.sample_rate <= 500'000 ? 1'750'000 : 2'500'000); // TX LPF min 1M75 for SR <=500K, and 2M5 (by experimental test) for SR >500K
transmitter_model.enable();
// Reset the transmit progress bar.

1
firmware/application/apps/ui_playlist.hpp
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@ -60,7 +60,6 @@ class PlaylistView : public View {
// More header == less spectrum view.
static constexpr ui::Dim header_height = 6 * 16;
static constexpr uint32_t baseband_bandwidth = 2'500'000;
struct playlist_entry {
std::filesystem::path path{};

1
firmware/application/apps/ui_rds.cpp
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@ -187,6 +187,7 @@ void RDSView::start_tx() {
else
frame_datetime.clear();
transmitter_model.set_baseband_bandwidth(1'750'000); // Big Spectrum harmonics reduction, and now quicker decoding time.
transmitter_model.enable();
tx_thread = std::make_unique<RDSThread>(frames);

26
firmware/application/hw/max2837.cpp
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@ -122,7 +122,7 @@ void MAX2837::init() {
_map.r.lpf_1.LPF_EN = 1; /* Enable low-pass filter */
_map.r.lpf_1.ModeCtrl = 0b01; /* Rx LPF */
_map.r.lpf_1.FT = 0b0000; /* 5MHz LPF */
_map.r.lpf_1.FT = 0b0000; /* 1,75MHz LPF */
_map.r.spi_en.EN_SPI = 1; /* enable chip functions when ENABLE pin set */
@ -233,10 +233,28 @@ void MAX2837::set_vga_gain(const int_fast8_t db) {
flush();
}
void MAX2837::set_lpf_rf_bandwidth(const uint32_t bandwidth_minimum) {
void MAX2837::set_lpf_rf_bandwidth_rx(const uint32_t bandwidth_minimum) {
_map.r.lpf_1.ModeCtrl = 0b01; /* Address reg 2, D3-D2, Set mode lowpass filter block to Rx LPF . Active when Address 6 D<9> = 1 */
_map.r.lpf_1.FT = filter::bandwidth_ordinal(bandwidth_minimum);
_dirty[Register::LPF_1] = 1;
flush();
flush_one(Register::LPF_1);
_map.r.vga_3_rx_top.LPF_MODE_SEL = 1; /* Address 6 reg, D9 bit:LPF mode mux, LPF_MODE_SEL 0 = Normal operation, 1 = Operating mode is programmed Address 2 D3:D2*/
flush_one(Register::VGA_3_RX_TOP);
_map.r.vga_3_rx_top.LPF_MODE_SEL = 0; /* Leave LPF_MODE_SEL 0 = Normal operation */
flush_one(Register::VGA_3_RX_TOP);
}
void MAX2837::set_lpf_rf_bandwidth_tx(const uint32_t bandwidth_minimum) {
_map.r.lpf_1.ModeCtrl = 0b10; /* Address 2 reg, D3-D2, Set mode lowpass filter block to Tx LPF . Active when Address 6 D<9> = 1 */
_map.r.lpf_1.FT = filter::bandwidth_ordinal(bandwidth_minimum);
flush_one(Register::LPF_1);
_map.r.vga_3_rx_top.LPF_MODE_SEL = 1; /* Address 6 reg, D9 bit:LPF mode mux, LPF_MODE_SEL 0 = Normal operation, 1 = Operating mode is programmed Address 2 D3:D2*/
flush_one(Register::VGA_3_RX_TOP);
_map.r.vga_3_rx_top.LPF_MODE_SEL = 0; /* Leave LPF_MODE_SEL 0 = Normal operation */
flush_one(Register::VGA_3_RX_TOP);
}
bool MAX2837::set_frequency(const rf::Frequency lo_frequency) {

3
firmware/application/hw/max2837.hpp
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@ -783,7 +783,8 @@ class MAX2837 : public MAX283x {
void set_tx_vga_gain(const int_fast8_t db) override;
void set_lna_gain(const int_fast8_t db) override;
void set_vga_gain(const int_fast8_t db) override;
void set_lpf_rf_bandwidth(const uint32_t bandwidth_minimum) override;
void set_lpf_rf_bandwidth_rx(const uint32_t bandwidth_minimum) override;
void set_lpf_rf_bandwidth_tx(const uint32_t bandwidth_minimum) override;
#if 0
void rx_cal() {
_map.r.spi_en.EN_SPI = 1;

28
firmware/application/hw/max2839.cpp
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@ -278,10 +278,32 @@ void MAX2839::set_vga_gain(const int_fast8_t db) {
configure_rx_gain();
}
void MAX2839::set_lpf_rf_bandwidth(const uint32_t bandwidth_minimum) {
void MAX2839::set_lpf_rf_bandwidth_rx(const uint32_t bandwidth_minimum) {
_map.r.lpf_vga_1.ModeCtrl = 0b01; /* Address reg 5, D9-D8, Set mode lowpass filter block to Rx LPF . Active when Address 8 D<2> = 1 */
flush_one(Register::LPF_VGA_1);
_map.r.rx_top_1.LPF_MODE_SEL = 1; /* Address 8 reg, D2 bit:LPF mode mux, LPF_MODE_SEL 0 = Normal operation, 1 = Operating mode is programmed Address 5 D<9:8> */
flush_one(Register::RX_TOP_1);
_map.r.lpf.FT = filter::bandwidth_ordinal(bandwidth_minimum);
_dirty[Register::LPF] = 1;
flush();
flush_one(Register::LPF);
_map.r.rx_top_1.LPF_MODE_SEL = 0; /* Address 8 reg, D2 bit:LPF mode mux, LPF_MODE_SEL 0 = Normal operation, 1 = Operating mode is programmed Address 5 D<9:8> */
flush_one(Register::RX_TOP_1); /* Leave LPF_MODE_SEL 0 = Normal operation */
}
void MAX2839::set_lpf_rf_bandwidth_tx(const uint32_t bandwidth_minimum) {
_map.r.lpf_vga_1.ModeCtrl = 0b10; /* Address reg 5, D9-D8, Set mode lowpass filter block to Tx LPF . Active when Address 8 D<2> = 1 */
flush_one(Register::LPF_VGA_1);
_map.r.rx_top_1.LPF_MODE_SEL = 1; /* Address 8 reg, D2 bit:LPF mode mux, LPF_MODE_SEL 0 = Normal operation, 1 = Operating mode is programmed Address 5 D<9:8> */
flush_one(Register::RX_TOP_1);
_map.r.lpf.FT = filter::bandwidth_ordinal(bandwidth_minimum);
flush_one(Register::LPF);
_map.r.rx_top_1.LPF_MODE_SEL = 0; /* Address 8 reg, D2 bit:LPF mode mux, LPF_MODE_SEL 0 = Normal operation, 1 = Operating mode is programmed Address 5 D<9:8> */
flush_one(Register::RX_TOP_1); /* Leave LPF_MODE_SEL 0 = Normal operation */
}
bool MAX2839::set_frequency(const rf::Frequency lo_frequency) {

3
firmware/application/hw/max2839.hpp
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@ -686,7 +686,8 @@ class MAX2839 : public MAX283x {
void set_tx_vga_gain(const int_fast8_t db) override;
void set_lna_gain(const int_fast8_t db) override;
void set_vga_gain(const int_fast8_t db) override;
void set_lpf_rf_bandwidth(const uint32_t bandwidth_minimum) override;
void set_lpf_rf_bandwidth_rx(const uint32_t bandwidth_minimum) override;
void set_lpf_rf_bandwidth_tx(const uint32_t bandwidth_minimum) override;
bool set_frequency(const rf::Frequency lo_frequency) override;
void set_rx_lo_iq_calibration(const size_t v) override;
void set_rx_buff_vcm(const size_t v) override;

3
firmware/application/hw/max283x.hpp
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@ -123,7 +123,8 @@ class MAX283x {
virtual void set_tx_vga_gain(const int_fast8_t db);
virtual void set_lna_gain(const int_fast8_t db);
virtual void set_vga_gain(const int_fast8_t db);
virtual void set_lpf_rf_bandwidth(const uint32_t bandwidth_minimum);
virtual void set_lpf_rf_bandwidth_rx(const uint32_t bandwidth_minimum);
virtual void set_lpf_rf_bandwidth_tx(const uint32_t bandwidth_minimum);
virtual bool set_frequency(const rf::Frequency lo_frequency);

8
firmware/application/radio.cpp
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@ -232,8 +232,12 @@ void set_tx_gain(const int_fast8_t db) {
second_if->set_tx_vga_gain(db);
}
void set_baseband_filter_bandwidth(const uint32_t bandwidth_minimum) {
second_if->set_lpf_rf_bandwidth(bandwidth_minimum);
void set_baseband_filter_bandwidth_rx(const uint32_t bandwidth_minimum) {
second_if->set_lpf_rf_bandwidth_rx(bandwidth_minimum);
}
void set_baseband_filter_bandwidth_tx(const uint32_t bandwidth_minimum) {
second_if->set_lpf_rf_bandwidth_tx(bandwidth_minimum);
}
void set_baseband_rate(const uint32_t rate) {

3
firmware/application/radio.hpp
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@ -50,7 +50,8 @@ void set_rf_amp(const bool rf_amp);
void set_lna_gain(const int_fast8_t db);
void set_vga_gain(const int_fast8_t db);
void set_tx_gain(const int_fast8_t db);
void set_baseband_filter_bandwidth(const uint32_t bandwidth_minimum);
void set_baseband_filter_bandwidth_rx(const uint32_t bandwidth_minimum);
void set_baseband_filter_bandwidth_tx(const uint32_t bandwidth_minimum);
void set_baseband_rate(const uint32_t rate);
void set_antenna_bias(const bool on);

2
firmware/application/receiver_model.cpp
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@ -270,7 +270,7 @@ void ReceiverModel::update_tuning_frequency() {
}
void ReceiverModel::update_baseband_bandwidth() {
radio::set_baseband_filter_bandwidth(baseband_bandwidth());
radio::set_baseband_filter_bandwidth_rx(baseband_bandwidth());
}
void ReceiverModel::update_sampling_rate() {

2
firmware/application/transmitter_model.cpp
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@ -139,7 +139,7 @@ void TransmitterModel::update_tuning_frequency() {
}
void TransmitterModel::update_baseband_bandwidth() {
radio::set_baseband_filter_bandwidth(baseband_bandwidth());
radio::set_baseband_filter_bandwidth_tx(baseband_bandwidth());
}
void TransmitterModel::update_sampling_rate() {