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fastsa/main.cpp

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C++
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#include <iostream>
#include <cstdlib>
#include <cstring>
#include <thread>
#include <atomic>
#include <mutex>
#include <vector>
#include <complex>
#include <chrono>
#include <format>
#include <semaphore>
#include <experimental/net>
#include <GLFW/glfw3.h>
#include <imgui.h>
#include <imgui_impl_glfw.h>
#include <imgui_impl_opengl3.h>
#include <libbladeRF.h>
namespace net = std::experimental::net;
using namespace std::literals::chrono_literals;
void fft_mag(std::complex<float>* in, float* out, size_t len);
static const size_t block_len = 16384;
static const int wf_width = 1000;
static const int wf_height = 1200;
static std::atomic<bool> shutdown_threads;
static std::atomic<float> tec_current;
static void tec_thread()
{
net::io_context io_context;
net::ip::tcp::socket tec_socket(io_context);
tec_socket.connect(net::ip::tcp::endpoint(net::ip::make_address("192.168.1.27"), 23));
while(!shutdown_threads) {
// FIXME: net::write seems unimplemented as of libstdc++ 13
tec_socket.write_some(net::buffer(std::format("pwm 0 i_set {:.6f}\n", (float)tec_current)));
std::string reply;
net::read(tec_socket, net::dynamic_buffer(reply),
[&reply](auto ec, auto n) -> std::size_t
{
if(ec || (reply.size() > 0 && reply.compare(reply.size()-1, 1, "\n") == 0))
return 0;
else
return 1;
});
std::this_thread::sleep_for(100ms);
}
}
static std::atomic<bool> poh_accept_input;
static std::binary_semaphore poh_input_ready{0};
static std::complex<float> poh_input_block[block_len];
static std::mutex wf_poh_mutex;
static unsigned int wf_poh[wf_width*wf_height];
static std::atomic<float> freq_setpoint;
static std::atomic<float> freq_peak;
static std::atomic<float> tec_bias;
static std::atomic<float> tec_p;
static void poh_thread()
{
std::vector<float> block_mag(block_len);
while(!shutdown_threads) {
poh_accept_input = true;
poh_input_ready.acquire();
fft_mag(poh_input_block, block_mag.data(), block_len);
// stabilize laser
float freq_peak_local;
freq_peak_local = 40.0f*float(distance(block_mag.begin(), max_element(block_mag.begin(), block_mag.end())))/float(block_len);
freq_peak = freq_peak_local;
float freq_error = freq_peak_local - freq_setpoint;
tec_current = std::max(tec_bias+tec_p*freq_error, 0.0f);
// update waterfall
{
std::lock_guard<std::mutex> guard(wf_poh_mutex);
std::memmove(&wf_poh[wf_width], &wf_poh[0], sizeof(int)*wf_width*(wf_height - 1));
for(int i=0;i<wf_width;i++) {
int j = i*block_len/wf_width;
wf_poh[i] = 0xff000000 | 0x010101*std::min(int(block_mag[j]/900.0f), 255);
}
wf_poh[int(freq_setpoint*wf_width)/40] = 0xff0000ff;
}
}
}
static std::atomic<int> frames_processed;
static std::atomic<int> frames_dropped;
static auto brf_last_second = std::chrono::time_point<std::chrono::steady_clock>::min();
static int brf_frames_processed_cnt = 0;
static int brf_frames_dropped_cnt = 0;
static void* brf_dispatch(struct bladerf* dev, struct bladerf_stream* stream,
struct bladerf_metadata* meta, void* samples_v, size_t num_samples, void* user_data)
{
if(poh_accept_input) {
std::complex<int16_t>* samples = (std::complex<int16_t>*)samples_v;
for(size_t i=0;i<block_len;i++) {
poh_input_block[i] = samples[2*i];
}
poh_accept_input = false;
poh_input_ready.release();
brf_frames_processed_cnt++;
} else
brf_frames_dropped_cnt++;
if((std::chrono::steady_clock::now() - brf_last_second) >= 1s) {
frames_processed = brf_frames_processed_cnt;
frames_dropped = brf_frames_dropped_cnt;
brf_frames_processed_cnt = 0;
brf_frames_dropped_cnt = 0;
brf_last_second += 1s;
}
if(shutdown_threads)
return BLADERF_STREAM_SHUTDOWN;
else
return samples_v;
}
static void brf_thread()
{
struct bladerf_devinfo brf_dev_info;
struct bladerf* brf_dev;
struct bladerf_stream* brf_stream;
void** brf_buffers;
int status;
bladerf_init_devinfo(&brf_dev_info);
if((status = bladerf_open_with_devinfo(&brf_dev, &brf_dev_info)) != 0) {
std::cerr << "cannot open bladeRF device: " << bladerf_strerror(status) << std::endl;
return;
}
for(int i=0;i<2;i++) {
if((status = bladerf_set_frequency(brf_dev, BLADERF_CHANNEL_RX(i), 1'655'000'000)) != 0) {
std::cerr << "failed to set bladeRF frequency: " << bladerf_strerror(status) << std::endl;
bladerf_close(brf_dev);
return;
}
if((status = bladerf_set_sample_rate(brf_dev, BLADERF_CHANNEL_RX(i), 40'000'000, NULL)) != 0) {
std::cerr << "failed to set bladeRF sample rate: " << bladerf_strerror(status) << std::endl;
bladerf_close(brf_dev);
return;
}
if((status = bladerf_set_bandwidth(brf_dev, BLADERF_CHANNEL_RX(i), 35'000'000, NULL)) != 0) {
std::cerr << "failed to set bladeRF bandwidth: " << bladerf_strerror(status) << std::endl;
bladerf_close(brf_dev);
return;
}
if((status = bladerf_set_gain(brf_dev, BLADERF_CHANNEL_RX(i), 20)) != 0) {
std::cerr << "failed to set bladeRF gain: " << bladerf_strerror(status) << std::endl;
bladerf_close(brf_dev);
return;
}
}
if((status = bladerf_init_stream(&brf_stream, brf_dev, brf_dispatch, &brf_buffers,
16, BLADERF_FORMAT_SC16_Q11, 2*block_len, 8, NULL)) != 0) {
std::cerr << "failed to init bladeRF stream: " << bladerf_strerror(status) << std::endl;
return;
}
if((status = bladerf_enable_module(brf_dev, BLADERF_CHANNEL_RX(0), true) != 0)) {
std::cerr << "failed to enable bladeRF RX: " << bladerf_strerror(status) << std::endl;
bladerf_deinit_stream(brf_stream);
bladerf_close(brf_dev);
return;
}
if((status = bladerf_enable_module(brf_dev, BLADERF_CHANNEL_RX(1), true) != 0)) {
std::cerr << "failed to enable bladeRF RX: " << bladerf_strerror(status) << std::endl;
bladerf_enable_module(brf_dev, BLADERF_CHANNEL_RX(0), false);
bladerf_deinit_stream(brf_stream);
bladerf_close(brf_dev);
return;
}
brf_last_second = std::chrono::steady_clock::now();
if((status = bladerf_stream(brf_stream, BLADERF_RX_X2)) != 0) {
std::cerr << "bladeRF stream failed: " << bladerf_strerror(status) << std::endl;
bladerf_enable_module(brf_dev, BLADERF_CHANNEL_RX(1), false);
bladerf_enable_module(brf_dev, BLADERF_CHANNEL_RX(0), false);
bladerf_deinit_stream(brf_stream);
bladerf_close(brf_dev);
return;
};
bladerf_enable_module(brf_dev, BLADERF_CHANNEL_RX(1), false);
bladerf_enable_module(brf_dev, BLADERF_CHANNEL_RX(0), false);
bladerf_deinit_stream(brf_stream);
bladerf_close(brf_dev);
}
int main(int argc, char* argv[])
{
if(!glfwInit()) {
std::cerr << "failed to initialize GLFW" << std::endl;
return 1;
}
std::atexit(glfwTerminate);
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
static GLFWwindow* window = glfwCreateWindow(1500, 2200, "fastsa", nullptr, nullptr);
if(window == nullptr) {
std::cerr << "failed to create GLFW window" << std::endl;
return 1;
}
static auto DestroyWindow = []() {
glfwDestroyWindow(window);
};
std::atexit(DestroyWindow);
glfwMakeContextCurrent(window);
glfwSwapInterval(1);
IMGUI_CHECKVERSION();
ImGui::CreateContext();
static auto ImGuiDestroyContext = []() {
ImGui::DestroyContext();
};
std::atexit(ImGuiDestroyContext);
ImGuiIO& io = ImGui::GetIO();
io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
ImGui::StyleColorsDark();
ImGui_ImplGlfw_InitForOpenGL(window, true);
std::atexit(ImGui_ImplGlfw_Shutdown);
ImGui_ImplOpenGL3_Init("#version 130");
std::atexit(ImGui_ImplOpenGL3_Shutdown);
GLuint wftex[2];
for(size_t i=0;i<2;i++) {
glGenTextures(1, &wftex[i]);
glBindTexture(GL_TEXTURE_2D, wftex[i]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
static std::thread brf_thread_h = std::thread(brf_thread);
static auto JoinBRF = []() {
brf_thread_h.join();
};
std::atexit(JoinBRF);
static std::thread poh_thread_h = std::thread(poh_thread);
static auto JoinPOH = []() {
poh_thread_h.join();
};
std::atexit(JoinPOH);
static std::thread tec_thread_h = std::thread(tec_thread);
static auto JoinTEC = []() {
tec_thread_h.join();
};
std::atexit(JoinTEC);
shutdown_threads = false;
static auto SetShutdown = []() {
shutdown_threads = true;
};
std::atexit(SetShutdown);
bool exit = false;
bool update_wf = true;
float freq_setpoint_local = 0.0f;
float tec_bias_local = 0.02f;
float tec_p_local = 0.001f;
while(!exit && !glfwWindowShouldClose(window)) {
glfwPollEvents();
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
if(update_wf) {
#if defined(GL_UNPACK_ROW_LENGTH) && !defined(__EMSCRIPTEN__)
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
#endif
glBindTexture(GL_TEXTURE_2D, wftex[0]);
{
std::lock_guard<std::mutex> guard(wf_poh_mutex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, wf_width, wf_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, wf_poh);
}
glBindTexture(GL_TEXTURE_2D, wftex[1]);
{
std::lock_guard<std::mutex> guard(wf_poh_mutex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, wf_width, wf_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, wf_poh);
}
}
ImGui_ImplOpenGL3_NewFrame();
ImGui_ImplGlfw_NewFrame();
ImGui::NewFrame();
ImGui::SetNextWindowPos(ImVec2(0.0f, 0.0f));
ImGui::SetNextWindowSize(io.DisplaySize);
ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
ImGui::Begin("fastsa", nullptr, ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoResize);
ImGui::BeginTable("fastsa", 3, ImGuiTableFlags_SizingStretchSame | ImGuiTableFlags_Resizable);
ImGui::TableSetupColumn("SBS laser control", 0, 280.0f);
ImGui::TableSetupColumn("Pump/output heterodyne", 0, 1000.0f);
ImGui::TableSetupColumn("Lineshape", 0, 1000.0f);
ImGui::TableHeadersRow();
ImGui::TableNextColumn();
ImGui::Checkbox("Update waterfall plots", &update_wf);
ImGui::Text("Baseband peak: %.3f MHz", (float)freq_peak);
ImGui::Text("TEC current: %.6f mA", (float)tec_current);
ImGui::SliderFloat("Setpoint", &freq_setpoint_local, 0.0f, 40.0f);
ImGui::SliderFloat("TEC bias", &tec_bias_local, 0.0f, 0.5f);
ImGui::SliderFloat("TEC P", &tec_p_local, -1.0f, 1.0f);
freq_setpoint = freq_setpoint_local;
tec_bias = tec_bias_local;
tec_p = 0.05f*tec_p_local;
if(ImGui::Button("Exit"))
exit = true;
ImGui::Text("Frames processed: %d", (int)frames_processed);
ImGui::Text("Frames dropped: %d", (int)frames_dropped);
ImGui::TableNextColumn();
ImGui::Image((void*)(intptr_t)wftex[0], ImVec2(wf_width, wf_height));
ImGui::TableNextColumn();
ImGui::Image((void*)(intptr_t)wftex[1], ImVec2(wf_width, wf_height));
ImGui::EndTable();
ImGui::End();
ImGui::PopStyleVar(1);
ImGui::Render();
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
int display_w, display_h;
glfwGetFramebufferSize(window, &display_w, &display_h);
glViewport(0, 0, display_w, display_h);
glfwSwapBuffers(window);
}
return 0;
}
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