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portapack-mayhem/firmware/baseband-tx/main.cpp

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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 "ch.h"
#include "test.h"
#include "lpc43xx_cpp.hpp"
#include "portapack_shared_memory.hpp"
#include "portapack_dma.hpp"
#include "gpdma.hpp"
#include "baseband.hpp"
#include "baseband_dma.hpp"
#include "event_m4.hpp"
#include "irq_ipc_m4.hpp"
#include "touch_dma.hpp"
#include "modules.h"
#include "dsp_decimate.hpp"
#include "dsp_demodulate.hpp"
#include "dsp_fft.hpp"
#include "dsp_fir_taps.hpp"
#include "dsp_iir.hpp"
#include "dsp_iir_config.hpp"
#include "dsp_squelch.hpp"
#include "channel_decimator.hpp"
#include "baseband_processor.hpp"
#include "proc_fsk_lcr.hpp"
#include "proc_jammer.hpp"
#include "proc_xylos.hpp"
#include "clock_recovery.hpp"
#include "packet_builder.hpp"
#include "message_queue.hpp"
#include "utility.hpp"
#include "debug.hpp"
#include "audio.hpp"
#include "audio_dma.hpp"
#include "gcc.hpp"
#include <cstdint>
#include <cstddef>
#include <array>
#include <string>
#include <bitset>
#include <math.h>
static baseband::Direction direction = baseband::Direction::Receive;
class ThreadBase {
public:
constexpr ThreadBase(
const char* const name
) : name { name }
{
}
static msg_t fn(void* arg) {
auto obj = static_cast<ThreadBase*>(arg);
chRegSetThreadName(obj->name);
obj->run();
return 0;
}
virtual void run() = 0;
private:
const char* const name;
};
class BasebandThread : public ThreadBase {
public:
BasebandThread(
) : ThreadBase { "baseband" }
{
}
Thread* start(const tprio_t priority) {
return chThdCreateStatic(wa, sizeof(wa),
priority, ThreadBase::fn,
this
);
}
Thread* thread_main { nullptr };
BasebandProcessor* baseband_processor { nullptr };
BasebandConfiguration baseband_configuration;
private:
WORKING_AREA(wa, 2048);
void run() override {
while(true) {
if (direction == baseband::Direction::Transmit) {
const auto buffer_tmp = baseband::dma::wait_for_tx_buffer();
const buffer_c8_t buffer {
buffer_tmp.p, buffer_tmp.count, baseband_configuration.sampling_rate
};
if( baseband_processor ) {
baseband_processor->execute(buffer);
}
} else {
const auto buffer_tmp = baseband::dma::wait_for_rx_buffer();
const buffer_c8_t buffer {
buffer_tmp.p, buffer_tmp.count, baseband_configuration.sampling_rate
};
if( baseband_processor ) {
baseband_processor->execute(buffer);
}
}
}
}
};
#define SAMPLES_PER_BIT 192
#define FILTER_SIZE 576
#define SAMPLE_BUFFER_SIZE SAMPLES_PER_BIT + FILTER_SIZE
static int32_t waveform_biphase[] = {
165,167,168,168,167,166,163,160,
157,152,147,141,134,126,118,109,
99,88,77,66,53,41,27,14,
0,-14,-29,-44,-59,-74,-89,-105,
-120,-135,-150,-165,-179,-193,-206,-218,
-231,-242,-252,-262,-271,-279,-286,-291,
-296,-299,-301,-302,-302,-300,-297,-292,
-286,-278,-269,-259,-247,-233,-219,-202,
-185,-166,-145,-124,-101,-77,-52,-26,
0,27,56,85,114,144,175,205,
236,266,296,326,356,384,412,439,
465,490,513,535,555,574,590,604,
616,626,633,637,639,638,633,626,
616,602,586,565,542,515,485,451,
414,373,329,282,232,178,121,62,
0,-65,-132,-202,-274,-347,-423,-500,
-578,-656,-736,-815,-894,-973,-1051,-1128,
-1203,-1276,-1347,-1415,-1479,-1540,-1596,-1648,
-1695,-1736,-1771,-1799,-1820,-1833,-1838,-1835,
-1822,-1800,-1767,-1724,-1670,-1605,-1527,-1437,
-1334,-1217,-1087,-943,-785,-611,-423,-219,
0,235,487,755,1040,1341,1659,1994,
2346,2715,3101,3504,3923,4359,4811,5280,
5764,6264,6780,7310,7856,8415,8987,9573,
10172,10782,11404,12036,12678,13329,13989,14656,
15330,16009,16694,17382,18074,18767,19461,20155,
20848,21539,22226,22909,23586,24256,24918,25571,
26214,26845,27464,28068,28658,29231,29787,30325,
30842,31339,31814,32266,32694,33097,33473,33823,
34144,34437,34699,34931,35131,35299,35434,35535,
35602,35634,35630,35591,35515,35402,35252,35065,
34841,34579,34279,33941,33566,33153,32702,32214,
31689,31128,30530,29897,29228,28525,27788,27017,
26214,25379,24513,23617,22693,21740,20761,19755,
18725,17672,16597,15501,14385,13251,12101,10935,
9755,8563,7360,6148,4927,3701,2470,1235,
0,-1235,-2470,-3701,-4927,-6148,-7360,-8563,
-9755,-10935,-12101,-13251,-14385,-15501,-16597,-17672,
-18725,-19755,-20761,-21740,-22693,-23617,-24513,-25379,
-26214,-27017,-27788,-28525,-29228,-29897,-30530,-31128,
-31689,-32214,-32702,-33153,-33566,-33941,-34279,-34579,
-34841,-35065,-35252,-35402,-35515,-35591,-35630,-35634,
-35602,-35535,-35434,-35299,-35131,-34931,-34699,-34437,
-34144,-33823,-33473,-33097,-32694,-32266,-31814,-31339,
-30842,-30325,-29787,-29231,-28658,-28068,-27464,-26845,
-26214,-25571,-24918,-24256,-23586,-22909,-22226,-21539,
-20848,-20155,-19461,-18767,-18074,-17382,-16694,-16009,
-15330,-14656,-13989,-13329,-12678,-12036,-11404,-10782,
-10172,-9573,-8987,-8415,-7856,-7310,-6780,-6264,
-5764,-5280,-4811,-4359,-3923,-3504,-3101,-2715,
-2346,-1994,-1659,-1341,-1040,-755,-487,-235,
0,219,423,611,785,943,1087,1217,
1334,1437,1527,1605,1670,1724,1767,1800,
1822,1835,1838,1833,1820,1799,1771,1736,
1695,1648,1596,1540,1479,1415,1347,1276,
1203,1128,1051,973,894,815,736,656,
578,500,423,347,274,202,132,65,
0,-62,-121,-178,-232,-282,-329,-373,
-414,-451,-485,-515,-542,-565,-586,-602,
-616,-626,-633,-638,-639,-637,-633,-626,
-616,-604,-590,-574,-555,-535,-513,-490,
-465,-439,-412,-384,-356,-326,-296,-266,
-236,-205,-175,-144,-114,-85,-56,-27,
0,26,52,77,101,124,145,166,
185,202,219,233,247,259,269,278,
286,292,297,300,302,302,301,299,
296,291,286,279,271,262,252,242,
231,218,206,193,179,165,150,135,
120,105,89,74,59,44,29,14,
0,-14,-27,-41,-53,-66,-77,-88,
-99,-109,-118,-126,-134,-141,-147,-152,
-157,-160,-163,-166,-167,-168,-168,-167
};
class RDSProcessor : public BasebandProcessor {
public:
void execute(buffer_c8_t buffer) override {
for (size_t i = 0; i<buffer.count; i++) {
//Sample generation 2.28M/10=228kHz
if(s >= 9) {
s = 0;
if(sample_count >= SAMPLES_PER_BIT) {
cur_bit = (shared_memory.rdsdata[(bit_pos / 26) & 15]>>(25-(bit_pos % 26))) & 1;
prev_output = cur_output;
cur_output = prev_output ^ cur_bit;
int32_t *src = waveform_biphase;
int idx = in_sample_index;
for(int j=0; j<FILTER_SIZE; j++) {
val = (*src++);
if (cur_output) val = -val;
sample_buffer[idx++] += val;
if (idx >= SAMPLE_BUFFER_SIZE) idx = 0;
}
in_sample_index += SAMPLES_PER_BIT;
if (in_sample_index >= SAMPLE_BUFFER_SIZE) in_sample_index -= SAMPLE_BUFFER_SIZE;
bit_pos++;
sample_count = 0;
}
sample = sample_buffer[out_sample_index];
sample_buffer[out_sample_index] = 0;
out_sample_index++;
if (out_sample_index >= SAMPLE_BUFFER_SIZE) out_sample_index = 0;
//AM @ 228k/4=57kHz
switch (mphase) {
case 0:
case 2: sample = 0; break;
case 1: break;
case 3: sample = -sample; break;
}
mphase++;
if (mphase >= 4) mphase = 0;
sample_count++;
} else {
s++;
}
//FM
frq = (sample>>16) * 386760;
phase = (phase + frq);
sphase = phase + (256<<16);
//re = sintab[(sphase & 0x03FF0000)>>16];
//im = sintab[(phase & 0x03FF0000)>>16];
buffer.p[i] = {(int8_t)re,(int8_t)im};
}
}
private:
int8_t re, im;
uint8_t mphase, s;
uint32_t bit_pos;
int32_t sample_buffer[SAMPLE_BUFFER_SIZE] = {0};
int32_t val;
uint8_t prev_output = 0;
uint8_t cur_output = 0;
uint8_t cur_bit = 0;
int sample_count = SAMPLES_PER_BIT;
int in_sample_index = 0;
int32_t sample;
int out_sample_index = SAMPLE_BUFFER_SIZE-1;
uint32_t phase, sphase;
int32_t sig, frq, frq_im, rdsc;
int32_t k;
};
class ToneProcessor : public BasebandProcessor {
public:
void execute(buffer_c8_t buffer) override {
for (size_t i = 0; i<buffer.count; i++) {
//Sample generation 2.28M/10 = 228kHz
if (s >= 9) {
s = 0;
aphase += 353205; // DEBUG
//sample = sintab[(aphase & 0x03FF0000)>>16];
} else {
s++;
}
//sample = sintab[(aphase & 0x03FF0000)>>16];
//FM
frq = sample * 500; // DEBUG
phase = (phase + frq);
sphase = phase + (256<<16);
//re = sintab[(sphase & 0x03FF0000)>>16];
//im = sintab[(phase & 0x03FF0000)>>16];
buffer.p[i] = {(int8_t)re,(int8_t)im};
}
}
private:
int8_t re, im;
uint8_t s;
uint32_t sample_count;
uint32_t aphase, phase, sphase;
int32_t sample, sig, frq;
};
extern "C" {
void __late_init(void) {
/*
* System initializations.
* - HAL initialization, this also initializes the configured device drivers
* and performs the board-specific initializations.
* - Kernel initialization, the main() function becomes a thread and the
* RTOS is active.
*/
halInit();
/* After this call, scheduler, systick, heap, etc. are available. */
/* By doing chSysInit() here, it runs before C++ constructors, which may
* require the heap.
*/
chSysInit();
}
}
static BasebandThread baseband_thread;
static void init() {
i2s::i2s0::configure(
audio::i2s0_config_tx,
audio::i2s0_config_rx,
audio::i2s0_config_dma
);
audio::dma::init();
audio::dma::configure();
audio::dma::enable();
i2s::i2s0::tx_start();
i2s::i2s0::rx_start();
LPC_CREG->DMAMUX = portapack::gpdma_mux;
gpdma::controller.enable();
nvicEnableVector(DMA_IRQn, CORTEX_PRIORITY_MASK(LPC_DMA_IRQ_PRIORITY));
baseband::dma::init();
touch::dma::init();
const auto thread_main = chThdSelf();
baseband_thread.thread_main = thread_main;
baseband_thread.start(NORMALPRIO + 20);
}
static void shutdown() {
// TODO: Is this complete?
nvicDisableVector(DMA_IRQn);
m0apptxevent_interrupt_disable();
chSysDisable();
systick_stop();
}
static void halt() {
port_disable();
while(true) {
port_wait_for_interrupt();
}
}
class EventDispatcher {
public:
MessageHandlerMap& message_handlers() {
return message_map;
}
void run() {
while(is_running) {
const auto events = wait();
dispatch(events);
}
}
void request_stop() {
is_running = false;
}
private:
MessageHandlerMap message_map;
bool is_running = true;
eventmask_t wait() {
return chEvtWaitAny(ALL_EVENTS);
}
void dispatch(const eventmask_t events) {
if( events & EVT_MASK_BASEBAND ) {
handle_baseband_queue();
}
if( events & EVT_MASK_SPECTRUM ) {
handle_spectrum();
}
}
void handle_baseband_queue() {
std::array<uint8_t, Message::MAX_SIZE> message_buffer;
while(Message* const message = shared_memory.baseband_queue.pop(message_buffer)) {
message_map.send(message);
}
}
void handle_spectrum() {
if( baseband_thread.baseband_processor ) {
baseband_thread.baseband_processor->update_spectrum();
}
}
};
const auto baseband_buffer =
new std::array<baseband::sample_t, 8192>();
char ram_loop[32];
typedef int (*fn_ptr)(void);
fn_ptr loop_ptr;
void ram_loop_fn(void) {
while(1) {}
}
void wait_for_switch(void) {
memcpy(&ram_loop[0], reinterpret_cast<char*>(&ram_loop_fn), 32);
loop_ptr = reinterpret_cast<fn_ptr>(&ram_loop[0]);
ReadyForSwitchMessage message;
shared_memory.application_queue.push(message);
(*loop_ptr)();
return;
}
int main(void) {
init();
events_initialize(chThdSelf());
m0apptxevent_interrupt_enable();
EventDispatcher event_dispatcher;
auto& message_handlers = event_dispatcher.message_handlers();
message_handlers.register_handler(Message::ID::BasebandConfiguration,
[&message_handlers](const Message* const p) {
auto message = reinterpret_cast<const BasebandConfigurationMessage*>(p);
if( message->configuration.mode != baseband_thread.baseband_configuration.mode ) {
if( baseband_thread.baseband_processor ) {
i2s::i2s0::tx_mute();
baseband::dma::disable();
}
// TODO: Timing problem around disabling DMA and nulling and deleting old processor
auto old_p = baseband_thread.baseband_processor;
baseband_thread.baseband_processor = nullptr;
delete old_p;
switch(message->configuration.mode) {
case TX_RDS:
direction = baseband::Direction::Transmit;
baseband_thread.baseband_processor = new RDSProcessor();
break;
case TX_LCR:
direction = baseband::Direction::Transmit;
baseband_thread.baseband_processor = new LCRFSKProcessor();
break;
case TX_TONE:
direction = baseband::Direction::Transmit;
baseband_thread.baseband_processor = new ToneProcessor();
break;
case TX_JAMMER:
direction = baseband::Direction::Transmit;
baseband_thread.baseband_processor = new JammerProcessor();
break;
case TX_XYLOS:
direction = baseband::Direction::Transmit;
baseband_thread.baseband_processor = new XylosProcessor();
break;
case 0xFF:
wait_for_switch();
default:
break;
}
if( baseband_thread.baseband_processor )
baseband::dma::enable(direction);
}
baseband::dma::configure(
baseband_buffer->data(),
direction
);
baseband_thread.baseband_configuration = message->configuration;
}
);
message_handlers.register_handler(Message::ID::Shutdown,
[&event_dispatcher](const Message* const) {
event_dispatcher.request_stop();
}
);
/* TODO: Ensure DMAs are configured to point at first LLI in chain. */
touch::dma::allocate();
touch::dma::enable();
baseband::dma::configure(
baseband_buffer->data(),
direction
);
//baseband::dma::allocate(4, 2048);
event_dispatcher.run();
shutdown();
ShutdownMessage shutdown_message;
shared_memory.application_queue.push(shutdown_message);
halt();
return 0;
}
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