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Jan Käberich
parent
bcb47717b5
commit
b636274b3b
9 changed files with 470 additions and 23 deletions
256
Software/HelperTools/SignalIDSamplerates/.cproject
Normal file
256
Software/HelperTools/SignalIDSamplerates/.cproject
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1
Software/HelperTools/SignalIDSamplerates/.gitignore
vendored
Normal file
1
Software/HelperTools/SignalIDSamplerates/.gitignore
vendored
Normal file
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@ -0,0 +1 @@
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|||
/Debug/
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||||
27
Software/HelperTools/SignalIDSamplerates/.project
Normal file
27
Software/HelperTools/SignalIDSamplerates/.project
Normal file
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@ -0,0 +1,27 @@
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|||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<projectDescription>
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||||
<name>SignalIDSamplerates</name>
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||||
<comment></comment>
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<projects>
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<buildCommand>
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<name>org.eclipse.cdt.managedbuilder.core.genmakebuilder</name>
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<triggers>clean,full,incremental,</triggers>
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<arguments>
|
||||
</arguments>
|
||||
</buildCommand>
|
||||
</buildSpec>
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||||
<natures>
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||||
<nature>org.eclipse.cdt.core.cnature</nature>
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||||
<nature>org.eclipse.cdt.core.ccnature</nature>
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||||
<nature>org.eclipse.cdt.managedbuilder.core.managedBuildNature</nature>
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<nature>org.eclipse.cdt.managedbuilder.core.ScannerConfigNature</nature>
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</projectDescription>
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|
|
@ -0,0 +1,48 @@
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<project>
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<provider copy-of="extension" id="org.eclipse.cdt.ui.UserLanguageSettingsProvider"/>
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<provider-reference id="org.eclipse.cdt.core.ReferencedProjectsLanguageSettingsProvider" ref="shared-provider"/>
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<provider-reference id="org.eclipse.cdt.managedbuilder.core.MBSLanguageSettingsProvider" ref="shared-provider"/>
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<provider class="org.eclipse.cdt.managedbuilder.language.settings.providers.GCCBuiltinSpecsDetector" console="false" env-hash="-580598439797579494" id="org.eclipse.cdt.managedbuilder.core.GCCBuiltinSpecsDetector" keep-relative-paths="false" name="CDT GCC Built-in Compiler Settings" parameter="${COMMAND} ${FLAGS} -E -P -v -dD "${INPUTS}"" prefer-non-shared="true">
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<language-scope id="org.eclipse.cdt.core.gcc"/>
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<language-scope id="org.eclipse.cdt.core.gcc"/>
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|
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</project>
|
||||
|
|
@ -0,0 +1,117 @@
|
|||
//============================================================================
|
||||
// Name : SignalIDSamplerates.cpp
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||||
// Author :
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// Version :
|
||||
// Copyright : Your copyright notice
|
||||
// Description : Hello World in C++, Ansi-style
|
||||
//============================================================================
|
||||
|
||||
#include <iostream>
|
||||
#include <vector>
|
||||
#include <cstdlib>
|
||||
#include <limits>
|
||||
using namespace std;
|
||||
|
||||
constexpr int32_t freqRange = 20000000;
|
||||
constexpr int32_t freqStep = 4000;
|
||||
constexpr int32_t FPGA_CLK = 102400000;
|
||||
constexpr int32_t IF_freq = 250000;
|
||||
constexpr int32_t minAliasDistance = 100000;
|
||||
|
||||
constexpr uint8_t minPrescaler = 112;
|
||||
constexpr uint8_t maxPrescaler = 180;
|
||||
constexpr uint8_t maxPrescalers = 5;
|
||||
|
||||
int bestDistance;
|
||||
vector<int> bestPrescalers;
|
||||
|
||||
int Alias(int f, int f_s) {
|
||||
// move into f_s range
|
||||
f %= f_s;
|
||||
if (f < 0) {
|
||||
f += f_s;
|
||||
}
|
||||
// fold at half the samplerate
|
||||
if(f >= f_s / 2) {
|
||||
f = f_s - f;
|
||||
}
|
||||
return f;
|
||||
}
|
||||
|
||||
int DistanceToIF(double f, double f_s) {
|
||||
auto alias = Alias(f, f_s);
|
||||
return abs(int(alias - IF_freq));
|
||||
}
|
||||
|
||||
int farthestDistanceForFrequency(double f, vector<int> &prescalers) {
|
||||
int highestDistance = numeric_limits<int>::min();
|
||||
|
||||
for(auto p : prescalers) {
|
||||
double f_s = (double) FPGA_CLK / p;
|
||||
auto dist = DistanceToIF(f, f_s);
|
||||
if(dist > highestDistance) {
|
||||
highestDistance = dist;
|
||||
}
|
||||
}
|
||||
return highestDistance;
|
||||
}
|
||||
|
||||
void checkPrescalers(vector<int> &prescalers) {
|
||||
// cout << "Checking [" << prescalers[0];
|
||||
// for (auto i = prescalers.begin() + 1; i != prescalers.end(); i++) {
|
||||
// cout << ',' << *i;
|
||||
// }
|
||||
// cout << "]... ";
|
||||
int lowestDistance = numeric_limits<int>::max();
|
||||
for(int freq = minAliasDistance + freqStep;freq < freqRange; freq += freqStep) {
|
||||
int dist = farthestDistanceForFrequency(IF_freq + freq, prescalers);
|
||||
if(dist < lowestDistance) {
|
||||
lowestDistance = dist;
|
||||
}
|
||||
if(freq > 2*IF_freq + minAliasDistance) {
|
||||
int dist = farthestDistanceForFrequency(IF_freq - freq, prescalers);
|
||||
if(dist < lowestDistance) {
|
||||
lowestDistance = dist;
|
||||
}
|
||||
}
|
||||
if(lowestDistance < bestDistance) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
// cout << lowestDistance << endl;
|
||||
if(lowestDistance > bestDistance) {
|
||||
bestDistance = lowestDistance;
|
||||
bestPrescalers = prescalers;
|
||||
}
|
||||
}
|
||||
|
||||
void recursivePrescalersTest(vector<int> &prescalers, int depth) {
|
||||
if(prescalers.size() >= depth) {
|
||||
checkPrescalers(prescalers);
|
||||
} else {
|
||||
prescalers.push_back(0);
|
||||
int start = minPrescaler;
|
||||
if(prescalers.size() > 1) {
|
||||
start = prescalers[prescalers.size() - 2] + 1;
|
||||
}
|
||||
for (int i = start; i <= maxPrescaler; i++) {
|
||||
prescalers.back() = i;
|
||||
recursivePrescalersTest(prescalers, depth);
|
||||
}
|
||||
prescalers.pop_back();
|
||||
}
|
||||
}
|
||||
|
||||
int main() {
|
||||
vector<int> prescalers = {112};
|
||||
for(int d = 2;d<=maxPrescalers;d++) {
|
||||
bestDistance = 0;
|
||||
recursivePrescalersTest(prescalers, d);
|
||||
cout << "Depth " << d <<": best distance: " << bestDistance << " Prescalers: [" << bestPrescalers[0];
|
||||
for (auto i = bestPrescalers.begin() + 1; i != bestPrescalers.end(); i++) {
|
||||
cout << ',' << *i;
|
||||
}
|
||||
cout << "]" << endl;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue