OscilloscopeGeneratorTrigger.cpp

/**
 * OscilloscopeGeneratorTrigger.cpp
 *
 * This example sets up the generator to generate a 1 kHz triangle waveform, 4 Vpp.
 * It also sets up the oscilloscope to perform a block mode measurement, triggered on "Generator new period".
 * A measurement is performed and the data is written to OscilloscopeGeneratorTrigger.csv.
 *
 * Find more information on http://www.tiepie.com/LibTiePie .
 */

#include "PrintInfo.hpp"
#include <fstream>
#include <iostream>
#include <thread>

#if defined(__linux) || defined(__unix)
#  include <cstdlib>
#  include <unistd.h>
#endif

int main()
{
  int status = EXIT_SUCCESS;

  // Initialize library:
  TiePie::Hardware::Library::init();

  // Print library information:
  printLibraryInfo();

  // Enable network search:
  TiePie::Hardware::Network::setAutoDetectEnabled(true);

  // Update device list:
  TiePie::Hardware::DeviceList::update();

  // Try to open an oscilloscope with block measurement support and a generator in the same device:
  std::unique_ptr<TiePie::Hardware::Oscilloscope> scp;
  std::unique_ptr<TiePie::Hardware::Generator> gen;

  for(uint32_t i = 0; !(scp && gen) && i < TiePie::Hardware::DeviceList::count(); i++)
  {
    const auto item = TiePie::Hardware::DeviceList::getItemByIndex(i);
    if(item->canOpen(TIEPIE_HW_DEVICETYPE_OSCILLOSCOPE) && item->canOpen(TIEPIE_HW_DEVICETYPE_GENERATOR))
    {
      scp = item->openOscilloscope();

      // Check for valid pointer and block measurement support:
      if(scp && scp->measureModes() & TIEPIE_HW_MM_BLOCK)
        gen = item->openGenerator();
      else
        scp = nullptr;
    }
  }

  if(scp && gen)
  {
    uint16_t channelCount = 0;

    try
    {
      // Oscilloscope settings:

      // Get the number of channels:
      channelCount = scp->channels.count();

      // Set measure mode:
      scp->setMeasureMode(TIEPIE_HW_MM_BLOCK);

      // Set sample rate:
      scp->setSampleRate(1e6); // 1 MHz

      // Set record length:
      const uint64_t recordlength = scp->setRecordLength(10000); // 10 kS

      // Set pre sample ratio:
      scp->setPreSampleRatio(0); // 0 %

      // For all channels:
      for(const auto& channel : scp->channels)
      {
        // Enable channel to measure it:
        channel->setEnabled(true);

        // Set range:
        channel->setRange(8); // 8 V

        // Set coupling:
        channel->setCoupling(TIEPIE_HW_CK_DCV); // DC Volt
      }

      // Set trigger timeout:
      scp->trigger->setTimeout(1); // 1 s

      // Disable all channel trigger sources:
      for(const auto& channel : scp->channels)
        channel->trigger->setEnabled(false);

      // Locate trigger input:
      const auto& triggerInput = scp->triggerInputs.getById(TIEPIE_HW_TIID_GENERATOR_NEW_PERIOD); // or (TIEPIE_HW_TIID_GENERATOR_START || (TIEPIE_HW_TIID_GENERATOR_STOP
      if(!triggerInput)
        throw std::runtime_error("Unknown trigger input!");

      // Enable trigger input:
      triggerInput->setEnabled(true);

      // Generator settings:

      // Set signal type:
      gen->setSignalType(TIEPIE_HW_ST_TRIANGLE);

      // Set frequency:
      gen->setFrequency(1e3); // 1 kHz

      // Set amplitude:
      gen->setAmplitude(2); // 2 V

      // Set offset:
      gen->setOffset(0); // 0 V

      // Enable output:
      gen->setOutputEnable(true);

      // Print oscilloscope info:
      printDeviceInfo(*scp);

      // Print generator info:
      printDeviceInfo(*gen);

      // Start measurement:
      scp->start();

      // Start signal generation:
      gen->start();

      // Wait for measurement to complete:
      while(!scp->isDataReady())
      {
        // 10 ms delay, to save CPU time:
        using namespace std::chrono_literals;
        std::this_thread::sleep_for(10ms);
      }

      // Stop generator:
      gen->stop();

      // Disable output:
      gen->setOutputEnable(false);

      // Create data buffer:
      std::vector<std::vector<float>> channelData(channelCount, std::vector<float>(recordlength));
      std::vector<float*> channelDataPointers(channelCount);
      for(size_t i = 0; i < channelCount; i++)
        channelDataPointers[i] = channelData[i].data();

      // Get the data from the scope:
      uint64_t samplesRead = scp->getData(channelDataPointers.data(), channelCount, 0, recordlength);

      // Open file with write/update permissions:
      const std::string filename("OscilloscopeGeneratorTrigger.csv");
      std::ofstream csv(filename.c_str(), std::ofstream::out);

      if(csv.is_open())
      {
        // Write csv header:
        csv << "Sample";
        for(uint16_t ch = 0; ch < channelCount; ch++)
          csv << ";Ch" << (ch + 1);
        csv << '\n';

        // Write the data to csv:
        for(uint64_t i = 0; i < samplesRead; i++)
        {
          csv << i;
          for(uint16_t ch = 0; ch < channelCount; ch++)
            csv << ";" << channelData[ch][i];
          csv << '\n';
        }

        std::cout << "Data written to: " << filename << '\n';

        // Close file:
        csv.close();
      }
      else
      {
        std::cerr << "Couldn't open file: " << filename << '\n';
        status = EXIT_FAILURE;
      }
    }
    catch(const std::exception& e)
    {
      std::cerr << "Exception: " << e.what() << '\n';
      status = EXIT_FAILURE;
    }

    // Close oscilloscope:
    scp = nullptr;

    // Close generator:
    gen = nullptr;
  }
  else
  {
    std::cerr << "No oscilloscope available with block measurement support or generator available in the same unit!\n";
    status = EXIT_FAILURE;
  }

  // Finalize library:
  TiePie::Hardware::Library::fini();

  return status;
}