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WIP: detect integer spurs

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This commit is contained in:
Jan Käberich 2025-02-26 08:55:31 +01:00
parent b6f26eb6dc
commit 72e2a331da
3 changed files with 15 additions and 3 deletions
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6
Software/VNA_embedded/.settings/stm32cubeide.project.prefs
View file

@ -1,5 +1,5 @@
2F62501ED4689FB349E356AB974DBE57=6F84FD31C089E822CF61FFCABCD0B7D1
2F62501ED4689FB349E356AB974DBE57=EF826FD321FB312AEADE4DB74B81458C
66BE74F758C12D739921AEA421D593D3=2
8DF89ED150041C4CBC7CB9A9CAA90856=6F84FD31C089E822CF61FFCABCD0B7D1
DC22A860405A8BF2F2C095E5B6529F12=E145D2B520F6278E1CA273AAD12F90E0
8DF89ED150041C4CBC7CB9A9CAA90856=EF826FD321FB312AEADE4DB74B81458C
DC22A860405A8BF2F2C095E5B6529F12=BF78DB58F29884459C61AFB6BB93F7B6
eclipse.preferences.version=1

8
Software/VNA_embedded/Application/Drivers/max2871.hpp
View file

@ -60,6 +60,14 @@ public:
uint64_t GetActualFrequency() {
return outputFrequency;
}
uint32_t DistanceToIntegerSpur() {
uint32_t dist = outputFrequency % f_PFD;
if(dist > f_PFD / 2) {
return f_PFD - dist;
} else {
return dist;
}
}
private:
static constexpr uint64_t MaxFreq = 6100000000; // 6GHz according to datasheet, but slight overclocking is possible

4
Software/VNA_embedded/Application/VNA.cpp
View file

@ -452,6 +452,10 @@ void VNA::SweepHalted() {
}
if (pointCnt == 0) {
last_LO2 = HW::getIF1() - HW::getIF2();
Si5351.SetPLL(Si5351C::PLL::B, last_LO2*HW::LO2Multiplier, HW::Ref::getSource());
Si5351.ResetPLL(Si5351C::PLL::B);
Si5351.WaitForLock(Si5351C::PLL::B, 10);
HAL_Delay(2);
}