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/*
* Copyright (c) 2024 Analog Devices Inc.
*
* This file is part of libm2k
* (see http://www.github.com/analogdevicesinc/libm2k).
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 2.1 of the License, 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/*
* Streaming on both channels with different sampling frequencies can cause filling all kernel buffers for one channel,
* blocking the push function for both channels. This example will illustrate a method of avoiding blocking.
*/
#include <cmath>
#include <algorithm>
#include <libm2k/m2k.hpp>
#include <libm2k/contextbuilder.hpp>
#include <libm2k/analog/m2kanalogout.hpp>
#include <thread>
using namespace std;
using namespace libm2k;
using namespace libm2k::analog;
using namespace libm2k::context;
constexpr float pi = 3.14;
std::vector<double> sampleRates = {75000, 7500};
std::vector<unsigned int> kernelBuffers = {20, 32};
void
pushNTimes(M2kAnalogOut *analogOut, unsigned int channelIndex, double *samples, unsigned int nbSamples, unsigned int n)
{
for (unsigned int i = 0; i < n; i++) {
analogOut->pushBytes(channelIndex, samples, nbSamples);
}
}
int main()
{
M2k *context = m2kOpen();
if (!context) {
std::cout << "Connection Error: No ADALM2000 device available/connected to your PC." << std::endl;
return 1;
}
M2kAnalogOut *analogOut = context->getAnalogOut();
// Prevent bad initial config
analogOut->reset();
context->calibrateDAC();
analogOut->setKernelBuffersCount(0, kernelBuffers[0]);
analogOut->setKernelBuffersCount(1, kernelBuffers[1]);
analogOut->setOversamplingRatio(0, 1);
analogOut->setOversamplingRatio(1, 1);
analogOut->setSampleRate(0, sampleRates[0]);
analogOut->setSampleRate(1, sampleRates[1]);
analogOut->enableChannel(0, true);
analogOut->enableChannel(1, true);
//streaming require a non-cyclic buffer
analogOut->setCyclic(false);
std::vector<double> samplesSine;
std::vector<std::vector<double>> samples;
for (int i = 0; i < 1024; i++) {
samplesSine.push_back(3 * sin(2 * pi * (i / 1024.0)));
}
samples.push_back(samplesSine);
samples.push_back(samplesSine);
unsigned int minKernelBuffers = std::min(kernelBuffers[0], kernelBuffers[1]);
unsigned int minSampleRate = std::min(sampleRates[0], sampleRates[1]);
unsigned int chnIdxMaxSampleRate = (sampleRates[0] > sampleRates[1]) ? 0 : 1;
std::vector<unsigned int> numberCycles;
for (int i = 0; i < 2; i++) {
unsigned int cycles = minKernelBuffers * (sampleRates[i] / minSampleRate);
numberCycles.push_back(cycles);
}
for (unsigned int i = 0; i < minKernelBuffers; i++) {
//pushing faster than the samples are processed
analogOut->push(samples);
}
unsigned int cyclesLeftToBePushed = numberCycles[chnIdxMaxSampleRate] - minKernelBuffers;
std::thread thread_ch1(pushNTimes, analogOut, chnIdxMaxSampleRate, samples[chnIdxMaxSampleRate].data(),
samples[chnIdxMaxSampleRate].size(), cyclesLeftToBePushed);
thread_ch1.join();
std::this_thread::sleep_for(std::chrono::milliseconds(400));
contextClose(context, false);
}
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