/* * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc. * Copyright (C) 2016 Furrtek * * 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 "ui_mictx.hpp" #include "baseband_api.hpp" #include "audio.hpp" #include "wm8731.hpp" using wolfson::wm8731::WM8731; #include "tonesets.hpp" #include "portapack_hal.hpp" #include "cpld_update.hpp" #include "string_format.hpp" #include "irq_controls.hpp" #include using namespace tonekey; using namespace portapack; WM8731 audio_codec_wm8731 { i2c0, 0x1a }; namespace ui { void MicTXView::focus() { switch(focused_ui) { case 0: field_frequency.focus(); break; case 1: field_rxfrequency.focus(); break; default: field_va.focus(); break; } } void MicTXView::update_vumeter() { vumeter.set_value(audio_level); } void MicTXView::on_tx_progress(const bool done) { // Roger beep played, stop transmitting if (done) set_tx(false); } void MicTXView::configure_baseband() { baseband::set_audiotx_config( sampling_rate / 20, // Update vu-meter at 20Hz transmitting ? transmitter_model.channel_bandwidth() : 0, mic_gain, shift_bits_s16, // to be used in dsp_modulate TONES_F2D(tone_key_frequency(tone_key_index), sampling_rate), enable_am, enable_dsb, enable_usb, enable_lsb ); } void MicTXView::set_tx(bool enable) { if (enable) { if (rx_enabled) //If audio RX is enabled rxaudio(false); //Then turn off audio RX transmitting = true; configure_baseband(); transmitter_model.set_tuning_frequency(tx_frequency); transmitter_model.set_tx_gain(tx_gain); transmitter_model.set_rf_amp(rf_amp); 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 { if (transmitting && rogerbeep_enabled) { baseband::request_beep(); //Transmit the roger beep transmitting = false; //And flag the end of the transmission so ... } else { // (if roger beep was enabled, this will be executed after the beep ends transmitting. transmitting = false; configure_baseband(); transmitter_model.disable(); if (rx_enabled) //If audio RX is enabled and we've been transmitting rxaudio(true); //Turn back on audio RX } } } void MicTXView::do_timing() { if (va_enabled) { if (!transmitting) { // Attack if (audio_level >= va_level) { if ((attack_timer >> 8) >= attack_ms) { decay_timer = 0; attack_timer = 0; set_tx(true); } else { attack_timer += lcd_frame_duration; } } else { attack_timer = 0; } } else { // Decay if (audio_level < va_level) { if ((decay_timer >> 8) >= decay_ms) { decay_timer = 0; attack_timer = 0; set_tx(false); } else { decay_timer += lcd_frame_duration; } } else { decay_timer = 0; } } } else { // Check for PTT release const auto switches_state = get_switches_state(); if (!switches_state[4] && transmitting && !button_touch) // Select button set_tx(false); } } /* Hmmmm. Maybe useless now. void MicTXView::on_tuning_frequency_changed(rf::Frequency f) { transmitter_model.set_tuning_frequency(f); //if ( rx_enabled ) receiver_model.set_tuning_frequency(f); //Update freq also for RX } */ void MicTXView::rxaudio(bool is_on) { if (is_on) { audio::input::stop(); baseband::shutdown(); if (enable_am || enable_usb || enable_lsb || enable_dsb) { // "NFM/FM",0 ," WFM ",1 , " AM ",2, " USB ", 3, " LSB ",4, " DSB-SC", 5 baseband::run_image(portapack::spi_flash::image_tag_am_audio); receiver_model.set_modulation(ReceiverModel::Mode::AMAudio); // that AM demodulation engine is common to all Amplitude mod : AM/USB/LSB/DSB (2,3,4,5) if (options_mode.selected_index() < 5) // We will be called here with 2,3,4,5 . We treat here demod. filter 2,3,4; (excluding DSB-C case (5) it is treated more down). receiver_model.set_am_configuration(options_mode.selected_index() - 1); // selecting proper filter(2,3,4). 2-1=1=>6k-AM(1) , 3-1=2=>+3k-USB(2), 4-1=3=>-3K-LSB(3), } else { // We are in NFM/FM or WFM (NFM BW:8k5 or 11k / FM BW 16k / WFM BW:200k) if (enable_wfm) { // WFM , BW 200Khz aprox , or the two new addional BW filters (180k, 40k) baseband::run_image(portapack::spi_flash::image_tag_wfm_audio); receiver_model.set_modulation(ReceiverModel::Mode::WidebandFMAudio); // receiver_model.set_wfm_configuration(n); // it is called above , depending user's selection (200k, 180k,40k). } else { // NFM BW:8k5 or 11k / FM BW 16k baseband::run_image(portapack::spi_flash::image_tag_nfm_audio); receiver_model.set_modulation(ReceiverModel::Mode::NarrowbandFMAudio); // // receiver_model.set_nbfm_configuration(n); is called above , depending user's selection (8k5, 11k, 16k). } } receiver_model.set_sampling_rate(3072000); receiver_model.set_baseband_bandwidth(1750000); // receiver_model.set_tuning_frequency(field_frequency.value()); //probably this too can be commented out. if (bool_same_F_tx_rx_enabled) // when stop TX ,define to which freq RX we return receiver_model.set_tuning_frequency(tx_frequency); // Update freq also for RX = TX else receiver_model.set_tuning_frequency(rx_frequency); // Now with seperate freq controls! receiver_model.set_lna(rx_lna); receiver_model.set_vga(rx_vga); receiver_model.set_rf_amp(rx_amp); receiver_model.enable(); hackrf::cpld::load_sram_no_verify(); // to have a good RX without any ghost inside Mic App audio::output::start(); } else { //These incredibly convoluted steps are required for the vumeter to reappear when stopping RX. receiver_model.set_modulation(ReceiverModel::Mode::NarrowbandFMAudio); //This fixes something with AM RX... receiver_model.disable(); baseband::shutdown(); baseband::run_image(portapack::spi_flash::image_tag_mic_tx); audio::output::stop(); audio::input::start(ak4951_alc_and_wm8731_boost_GUI); // When detected AK4951 => set up ALC mode; when detected WM8731 => set up mic_boost ON/OFF. portapack::pin_i2s0_rx_sda.mode(3); configure_baseband(); } } void MicTXView::on_headphone_volume_changed(int32_t v) { //if (rx_enabled) { const auto new_volume = volume_t::decibel(v - 99) + audio::headphone::volume_range().max; receiver_model.set_headphone_volume(new_volume); //} } void MicTXView::set_ptt_visibility(bool v) { tx_button.hidden(!v); } MicTXView::MicTXView( NavigationView& nav ) { portapack::pin_i2s0_rx_sda.mode(3); // This is already done in audio::init but gets changed by the CPLD overlay reprogramming baseband::run_image(portapack::spi_flash::image_tag_mic_tx); if (audio::debug::codec_name() =="WM8731" ) { add_children({ &labels_WM8731, // we have audio codec WM8731, same MIC menu as original. &vumeter, &options_gain, // MIC GAIN float factor on the GUI. &options_wm8731_boost_mode, // &check_va, &field_va, &field_va_level, &field_va_attack, &field_va_decay, &field_bw, &field_rfgain, &field_rfamp, &options_mode, &field_frequency, &options_tone_key, &check_rogerbeep, &check_common_freq_tx_rx, // added to handle common or separate freq- TX/RX &check_rxactive, &field_volume, &field_rxbw, &field_squelch, &field_rxfrequency, &field_rxlna, &field_rxvga, &field_rxamp, &tx_button }); } else { add_children({ &labels_AK4951, // we have audio codec AK4951, enable Automatic Level Control &vumeter, &options_gain, &options_ak4951_alc_mode, // &check_va, &field_va, &field_va_level, &field_va_attack, &field_va_decay, &field_bw, &field_rfgain, &field_rfamp, &options_mode, &field_frequency, &options_tone_key, &check_rogerbeep, &check_common_freq_tx_rx, // added to handle common or separate freq- TX/RX &check_rxactive, &field_volume, &field_rxbw, &field_squelch, &field_rxfrequency, &field_rxlna, &field_rxvga, &field_rxamp, &tx_button }); } tone_keys_populate(options_tone_key); options_tone_key.on_change = [this](size_t i, int32_t) { tone_key_index = i; }; options_tone_key.set_selected_index(0); options_gain.on_change = [this](size_t, int32_t v) { mic_gain = v / 10.0; configure_baseband(); }; options_gain.set_selected_index(1); // x1.0 preselected default. if (audio::debug::codec_name() =="WM8731") { options_wm8731_boost_mode.on_change = [this](size_t, int8_t v) { switch(v) { case 0: // +12 dB’s respect reference level orig fw 1.5.x fw FM : when +20dB's boost ON) and shift bits (>>8), shift_bits_s16 = 6; // now mic-boost on (+20dBs) and shift bits (>>6), +20+12=32 dB’s (orig fw +20 dBs+ 0dBs)=> +12dB's respect ref. break; case 1: // +06 dB’s reference level , (when +20dB's boost ON) shift_bits_s16 = 7; // now mic-boost on (+20dBs) and shift bits (>>7), +20+06=26 dB’s (orig fw +20 dBs+ 0dBs) => +06dB's respect ref. break; case 2: shift_bits_s16 = 4; // +04 dB’s respect ref level , (when +20dB's boost OFF) break; // now mic-boost off (+00dBs) shift bits (4) (+0+24dB's)=24 dBs => +04dB's respect ref. case 3: shift_bits_s16 = 5; // -02 dB’s respect ref level , (when +20dB's boost OFF) break; // now mic-boost off (+00dBs) shift bits (5) (+0+18dB's)=18 dBs => -02dB's respect ref. case 4: shift_bits_s16 = 6; // -08 dB’s respect ref level , (when +20dB's boost OFF) break; // now mic-boost off (+00dBs) shift bits (6) (+0+12dB's)=12 dBs => -08dB's respect ref. } ak4951_alc_and_wm8731_boost_GUI = v; // 0,..4 WM8731_boost dB's options, (combination boost on/off , and effective gain in captured data >>x) audio::input::start(ak4951_alc_and_wm8731_boost_GUI); // Detected (WM8731) , set up the proper wm_boost on/off , 0..4 (0,1) boost_on , (2,3,4) boost_0ff configure_baseband(); // to update in real timme,sending msg , var-parameters >>shift_bits FM msg ,to audio_tx from M0 to M4 Proc - }; options_wm8731_boost_mode.set_selected_index(3); // preset GUI index 3 as default WM -> -02 dB's . } else { shift_bits_s16 = 8; // Initialized default fixed >>8_FM for FM tx mod , shift audio data for AK4951 ,using top 8 bits s16 data (>>8) options_ak4951_alc_mode.on_change = [this](size_t, int8_t v) { ak4951_alc_and_wm8731_boost_GUI = v; // 0,..11, AK4951 Mic -Automatic volume Level Control options, audio::input::start(ak4951_alc_and_wm8731_boost_GUI); // Detected (AK4951) ==> Set up proper ALC mode from 0..11 options configure_baseband(); // sending fixed >>8_FM , var-parameters msg , to audiotx from this M0 to M4 process. }; } // options_ak4951_alc_mode.set_selected_index(0); tx_frequency = transmitter_model.tuning_frequency(); field_frequency.set_value(transmitter_model.tuning_frequency()); field_frequency.set_step(receiver_model.frequency_step()); field_frequency.on_change = [this](rf::Frequency f) { tx_frequency = f; if(!rx_enabled) { // not activated receiver. just update freq TX transmitter_model.set_tuning_frequency(f); } else { // activated receiver. if (bool_same_F_tx_rx_enabled) // user selected common freq- TX = RX receiver_model.set_tuning_frequency(f); //Update common freq also for RX } }; field_frequency.on_edit = [this, &nav]() { focused_ui = 0; // TODO: Provide separate modal method/scheme? auto new_view = nav.push(tx_frequency); new_view->on_changed = [this](rf::Frequency f) { tx_frequency = f; if(!rx_enabled) { transmitter_model.set_tuning_frequency(f); } else { if (bool_same_F_tx_rx_enabled) receiver_model.set_tuning_frequency(f); //Update freq also for RX } this->field_frequency.set_value(f); set_dirty(); }; }; field_bw.on_change = [this](uint32_t v) { transmitter_model.set_channel_bandwidth(v * 1000); }; field_bw.set_value(10); // pre-default first time, TX deviation FM for NFM / FM tx_gain = transmitter_model.tx_gain(); field_rfgain.on_change = [this](int32_t v) { tx_gain = v; }; field_rfgain.set_value(tx_gain); rf_amp = transmitter_model.rf_amp(); field_rfamp.on_change = [this](int32_t v) { rf_amp = (bool)v; }; field_rfamp.set_value(rf_amp ? 14 : 0); options_mode.on_change = [this](size_t, int32_t v) { //{ "NFM/FM", 0 }, { " WFM ", 1 },{ "AM", 2 },{ "USB", 3 },{ "LSB", 4 },{ "DSB", 5 } enable_am = false; enable_usb = false; enable_lsb = false; enable_dsb = false; enable_wfm = false; using option_t = std::pair; using options_t = std::vector; options_t rxbw; // Aux structure to change dynamically field_rxbw contents, switch(v) { case 0: //{ "FM", 0 } enable_am = false; enable_usb = false; enable_lsb = false; enable_dsb = false; field_bw.set_value(10); // pre-default deviation FM for WFM // field_bw.set_value(transmitter_model.channel_bandwidth() / 1000); //if (rx_enabled) rxaudio(rx_enabled); //Update now if we have RX audio on options_tone_key.hidden(0); // we are in FM mode , we should have active the Key-tones & CTCSS option. rxbw.emplace_back(" NFM1:8k5 ", 0); // restore the original dynamic field_rxbw value. rxbw.emplace_back(" NFM2:11k ", 1); rxbw.emplace_back(" FM :16k ", 2); field_rxbw.set_options(rxbw); // store that aux GUI option to the field_rxbw. field_rxbw.hidden(0); // we are in FM mode, we need to allow the user set up of the RX NFM BW selection (8K5, 11K, 16K) field_bw.hidden(0); // we are in FM mode, we need to allow FM deviation parameter , in non FM mode. break; case 1: //{ "WFM", 1 } enable_am = false; enable_usb = false; enable_lsb = false; enable_dsb = false; enable_wfm = true; field_bw.set_value(75); // pre-default deviation FM for WFM // field_bw.set_value(transmitter_model.channel_bandwidth() / 1000); //if (rx_enabled) rxaudio(rx_enabled); //Update now if we have RX audio on options_tone_key.hidden(0); // we are in WFM mode , we should have active the Key-tones & CTCSS option. rxbw.emplace_back(" 200k-WFM ", 0); // We allow the user selection of the 3 x WFM BW filters, (0) WFM-200K, (1) WFM-180K , (2) WFM-40K . rxbw.emplace_back(" 180k-WFM ", 1); rxbw.emplace_back(" 40k-WFM ", 2); field_rxbw.set_options(rxbw); // store that aux GUI option to the field_rxbw. field_rxbw.hidden(0); // we are in WFM mode, we need to show to the user the selected BW WFM filter . field_bw.hidden(0); // we are in WFM mode, we need to allow WFM deviation parameter , in non FM mode. break; case 2: //{ "AM", 2 } enable_am = true; rxaudio(rx_enabled); //Update now if we have RX audio on options_tone_key.set_selected_index(0); // we are NOT in FM mode , we reset the possible previous key-tones &CTCSS selection. set_dirty(); // Refresh display options_tone_key.hidden(1); // we hide that Key-tones & CTCSS input selecction, (no meaning in AM/DSB/SSB). rxbw.emplace_back(" DSB1-9k ", 0); // we offer in AM DSB two audio BW 9k / 6k . rxbw.emplace_back(" DSB2-6k ", 1); field_rxbw.set_options(rxbw); // store that aux GUI option to the field_rxbw. field_rxbw.hidden(0); // we show fixed RX AM BW 6Khz field_bw.hidden(1); // we hide the FM TX deviation parameter , in non FM mode. check_rogerbeep.hidden(0); // make visible again the "rogerbeep" selection. break; case 3: //{ "USB", 3 } enable_usb = true; rxaudio(rx_enabled); //Update now if we have RX audio on check_rogerbeep.set_value(false); // reset the possible activation of roger beep, because it is not compatible with SSB , by now. check_rogerbeep.hidden(1); // hide that roger beep selection. rxbw.emplace_back(" USB+3k ", 0); // locked a fixed option , to display it . field_rxbw.set_options(rxbw); // store that aux GUI option to the field_rxbw. set_dirty(); // Refresh display break; case 4: //{ "LSB", 4 } enable_lsb = true; rxaudio(rx_enabled); //Update now if we have RX audio on check_rogerbeep.set_value(false); // reset the possible activation of roger beep, because it is not compatible with SSB , by now. check_rogerbeep.hidden(1); // hide that roger beep selection. rxbw.emplace_back(" LSB-3k ", 0); // locked a fixed option , to display it . field_rxbw.set_options(rxbw); // store that aux GUI option to the field_rxbw. set_dirty(); // Refresh display break; case 5: //{ "DSB-SC", 5 } enable_dsb = true; rxaudio(rx_enabled); //Update now if we have RX audio on check_rogerbeep.hidden(0); // make visible again the "rogerbeep" selection. rxbw.emplace_back("SSB1:USB+3k", 0); // added dynamically two options (index 0,1) to that DSB-C case to the field_rxbw value. rxbw.emplace_back("SSB2:LSB-3k", 1); field_rxbw.set_options(rxbw); // store that aux GUI option to the field_rxbw. break; } //configure_baseband(); }; /* check_va.on_select = [this](Checkbox&, bool v) { va_enabled = v; text_ptt.hidden(v); //hide / show PTT text check_rxactive.hidden(v); //hide / show the RX AUDIO set_dirty(); //Refresh display }; */ field_va.set_selected_index(1); field_va.on_change = [this](size_t, int32_t v) { switch(v) { case 0: va_enabled = 0; this->set_ptt_visibility(0); check_rxactive.hidden(0); ptt_enabled = 0; break; case 1: va_enabled = 0; this->set_ptt_visibility(1); check_rxactive.hidden(0); ptt_enabled = 1; break; case 2: if (!rx_enabled) { va_enabled = 1; this->set_ptt_visibility(0); check_rxactive.hidden(1); ptt_enabled = 0; } else { field_va.set_selected_index(1); } break; } set_dirty(); }; check_rogerbeep.on_select = [this](Checkbox&, bool v) { rogerbeep_enabled = v; }; check_common_freq_tx_rx.on_select = [this](Checkbox&, bool v) { bool_same_F_tx_rx_enabled = v; field_rxfrequency.hidden(v); //Hide or show separated freq RX field . (When no hide user can enter down indep. freq for RX) set_dirty(); //Refresh GUI interface receiver_model.set_tuning_frequency(v ? tx_frequency : rx_frequency); // To go to the proper tuned freq. when toggling it }; field_va_level.on_change = [this](int32_t v) { va_level = v; vumeter.set_mark(v); }; field_va_level.set_value(40); field_va_attack.on_change = [this](int32_t v) { attack_ms = v; }; field_va_attack.set_value(500); field_va_decay.on_change = [this](int32_t v) { decay_ms = v; }; field_va_decay.set_value(1000); check_rxactive.on_select = [this](Checkbox&, bool v) { // vumeter.set_value(0); //Start with a clean vumeter rx_enabled = v; // check_va.hidden(v); //Hide or show voice activation rxaudio(v); //Activate-Deactivate audio rx accordingly set_dirty(); //Refresh interface }; field_volume.set_value((receiver_model.headphone_volume() - audio::headphone::volume_range().max).decibel() + 99); field_volume.on_change = [this](int32_t v) { this->on_headphone_volume_changed(v); }; field_rxbw.on_change = [this](size_t, int32_t v) { if (!(enable_am || enable_usb || enable_lsb || enable_dsb || enable_wfm )) { // In Previous fw versions, that nbfm_configuration(n) was done in any mode (FM/AM/SSB/DSB)...strictly speaking only need it in (NFM/FM) receiver_model.set_nbfm_configuration(v ); // we are in NFM/FM case, we need to select proper NFM/FM RX channel filter , NFM BW 8K5(0), NFM BW 11K(1) , FM BW 16K (2) } else { // we are not in NFM/FM mode .(we could be in any of the rest : AM /USB/LSB/DSB-SC) if (enable_am) { // we are in AM TX mode , we will allow both independent RX audio BW : AM 9K (9K00AE3 / AM 6K (6K00AE3). (In AM option v can be 0 (9k) , 1 (6k) receiver_model.set_am_configuration(v); // we are in AM TX mode , we need to select proper AM full path config AM-9K filter. 0+0 =>AM-9K(0), 0+1=1 =>AM-6K(1), } if (enable_dsb) { // we are in DSB-SC in TX mode , we will allow both independent RX SSB demodulation (USB / LSB side band). in that submenu, v is 0 (SSB1 USB) or 1 (SSB2 LSB) receiver_model.set_am_configuration(v +2 ); // we are in DSB-SC TX mode , we need to select proper SSB filter. 0+2 =>usb(2), 1+2=3 =>lsb(3), } if (enable_wfm) { receiver_model.set_wfm_configuration(v); // we are in WFM case, we need to select proper WFB RX BW filter , WFM BW 200K(0), WFM BW 180K(1) , WFM BW 40K(2) } } }; field_squelch.on_change = [this](int32_t v) { receiver_model.set_squelch_level(100 - v); }; field_squelch.set_value(0); receiver_model.set_squelch_level(0); rx_frequency = receiver_model.tuning_frequency(); field_rxfrequency.set_value(rx_frequency); field_rxfrequency.set_step(receiver_model.frequency_step()); field_rxfrequency.on_change = [this](rf::Frequency f) { // available when field rxfrequency not hidden => user selected separated freq RX/TX- rx_frequency = f; if(rx_enabled) receiver_model.set_tuning_frequency(f); }; field_rxfrequency.on_edit = [this, &nav]() { // available when field rxfrequency not hidden => user selected separated freq RX/TX- focused_ui = 1; // TODO: Provide separate modal method/scheme? auto new_view = nav.push(rx_frequency); new_view->on_changed = [this](rf::Frequency f) { rx_frequency = f; if(rx_enabled) receiver_model.set_tuning_frequency(f); this->field_rxfrequency.set_value(f); set_dirty(); }; }; rx_lna = receiver_model.lna(); field_rxlna.on_change = [this](int32_t v) { rx_lna = v; if(rx_enabled) receiver_model.set_lna(v); }; field_rxlna.set_value(rx_lna); rx_vga = receiver_model.vga(); field_rxvga.on_change = [this](int32_t v) { rx_vga = v; if(rx_enabled) receiver_model.set_vga(v); }; field_rxvga.set_value(rx_vga); rx_amp = receiver_model.rf_amp(); field_rxamp.on_change = [this](int32_t v) { rx_amp = v; if(rx_enabled) receiver_model.set_rf_amp(rx_amp); }; field_rxamp.set_value(rx_amp); tx_button.on_select = [this](Button&) { if(ptt_enabled && !transmitting) { set_tx(true); } }; tx_button.on_touch_release = [this](Button&) { if(button_touch) { button_touch = false; set_tx(false); } }; tx_button.on_touch_press = [this](Button&) { if(!transmitting) { button_touch = true; } }; transmitter_model.set_sampling_rate(sampling_rate); transmitter_model.set_baseband_bandwidth(1750000); set_tx(false); audio::set_rate(audio::Rate::Hz_24000); audio::input::start(ak4951_alc_and_wm8731_boost_GUI); // When detected AK4951 => set up ALC mode; when detected WM8731 => set up mic_boost ON/OFF. } MicTXView::~MicTXView() { audio::input::stop(); transmitter_model.set_tuning_frequency(tx_frequency); // Save Tx frequency instead of Rx. Or maybe we need some "System Wide" changes to seperate Tx and Rx frequency. transmitter_model.disable(); if (rx_enabled) //Also turn off audio rx if enabled rxaudio(false); hackrf::cpld::load_sram_no_verify(); // to leave all RX ok, without ghost signal problem at the exit . baseband::shutdown(); // better this function at the end, not load_sram() that sometimes produces hang up. } }