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141 commits

Author SHA1 Message Date
Roger Henderson
0b571688a9 add Correlated Double Sampling (CDS) support 
Implements CDS to reduce noise by taking multiple measurements at
different source PLL phase offsets and combining with cosine weighting.

Firmware changes (VNA.cpp, Protocol.hpp):
- Add cdsPhases field to SweepSettings (0=disabled, 2-7=phase count)
- Configure N internal sweep points per user point with phase offsets
- Accumulate weighted samples: result = Σ(sample[k] × cos(2π×k/N))
- Per-stage accumulators for multi-stage measurements

PC application changes:
- Add "CDS" checkbox to VNA acquisition toolbar
- When enabled, sets cdsPhases=2 for 180° differential measurement
- Tooltip explains the feature

With 180° CDS (2 samples):
- Sample at 0°: weight = cos(0°) = 1
- Sample at 180°: weight = cos(180°) = -1
- Combined result = Sample₀ - Sample₁₈₀

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2026-01-31 23:47:02 +13:00
Roger Henderson
6c06293179 add per-point source PLL phase adjustment support 
Adds ability to set phase adjustment on Source PLL for each sweep point.
When sourcePhase != 0, the FPGA executes a CDM toggle sequence after
normal PLL register load to apply the specified phase offset.

Changes:
- MAX2871.vhd: add PHASE_ADJUST input and CDM toggle state machine
- Sweep.vhd: extract phase from config, generate phase adjust signal
- SPIConfig.vhd: handle 112-bit config data (was 96-bit)
- top.vhd: wire phase adjustment signals, widen data buses
- SweepConfigMem.xco: update BRAM width to 112 bits
- FPGA.cpp/hpp: add sourcePhase parameter to WriteSweepConfig

Phase formula: phase_degrees = (sourcePhase / M) * 360
For 180° shift: sourcePhase = M/2

Note: SweepConfigMem IP core must be regenerated before FPGA build.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2026-01-31 16:57:10 +13:00
Jan Käberich
64791e6d4e option to restore default values of device configuration
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 2025-11-15 19:22:15 +01:00
Jan Käberich
be123420db Configuration for hardware version 0xD0
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 2025-10-28 12:08:13 +01:00
Jan Käberich
273dfa8037 add support for hardware version 0xD0 device status
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 2025-10-24 12:55:09 +02:00
Jan Käberich
6e2079fcfb menu entry to run internal alignment if supported by hardware version
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 2025-10-23 12:57:49 +02:00
Jan Käberich
ed699cfd6a hide device specific actions based on the hardware version
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 2025-10-23 10:16:33 +02:00
Jan Käberich
f51c6a0bce Manual control dialog for prototype 0xD0
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 2025-10-15 10:23:08 +02:00
Jan Käberich
5947584e63 manual control dialog for experimental hardware version 0xE0
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 2025-08-31 18:49:38 +02:00
Jan Käberich
f0c7f289cb Bugfix: remove not used optional parameter
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 2025-08-17 20:18:38 +02:00
Jan Käberich
8b44421ea3 improve PLL fractional divider algorithm 2025-08-17 19:37:10 +02:00
Jan Käberich
38b4a6ba39 Bugfix: correct PLL configuration at the band switch frequency (25 MHz) 2025-08-09 19:11:32 +02:00
Jan Käberich
abe2aefcf9 use PLL A to generate lowband source 2025-08-09 19:10:53 +02:00
Jan Käberich
162309e54a 1us delay after CS high on SPI flash 2025-05-31 14:59:14 +02:00
Jan Käberich
199bb7bbd7 improve GUI synchronization for compound device 2025-05-04 13:01:00 +02:00
Jan Käberich
4f63a28b61 force PLL turn on when assembling device status in VNA mode 2025-04-23 16:18:26 +02:00
Jan Käberich
1fb1c85208 Increase USB buffer timeout in VNA sweep 2025-03-13 10:02:36 +01:00
Jan Käberich
a39b9465a6 fix intermittent source generation problem 2025-03-05 09:34:41 +01:00
Jan Käberich
b133728f1d switch PLL reference to avoid integer spurs 2025-03-03 15:42:14 +01:00
Jan Käberich
72e2a331da WIP: detect integer spurs 2025-02-26 08:55:31 +01:00
Jan Käberich
ca25969574 Startup and communication bugfixes 
- reduce amount of mode switched when starting and loading setups
- improve logging for errors during HIL tests
- fix small USB communication bugs
 2025-01-06 17:34:46 +01:00
Jan Käberich
b77ba278de Improve spectrum analyzer 
- revert LO2 shift mechanism (restores previous SA speed)
- allow tracking generator to reach all(?) frequencies with sufficient accuracy
 2025-01-04 16:52:32 +01:00
Jan Käberich
a4faeb28b0 Working dwell time feature 
- Bugfixes:
	- improve SPI timing in FPGA
	- fix markers and reduce CPU load when using markers with fast traces
- New features:
	- dwell time configurable in acquisition toolbar
	- PLL settling delay in device configuration
	- device configuration persistent across power cycles
 2025-01-03 14:36:10 +01:00
Jan Käberich
24314e2361 WIP: rework 2.LO + add dwell time 2025-01-02 19:16:53 +01:00
Jan Käberich
0fc6c912fc Stop sweep after reset, fix failing tests 2024-04-22 15:08:10 +02:00
Jan Käberich
5136418e26 use frequency calibration when shifting 2.LO 2024-02-09 17:20:18 +01:00
Jan Käberich
11612e44d5 added dialogs for hardware version 0xFE 2023-11-07 14:26:31 +01:00
Jan Käberich
5a78091f2b Merge branch 'master' of github.com:jankae/LibreVNA 2023-09-05 11:13:13 +02:00
Jan Käberich
70a0079f92 Fix missing device log if USB connection is not established at power up 2023-09-05 11:13:05 +02:00
Jan Käberich
1c09b8e1cb Clear old VNA data when starting new sweep 2023-07-30 13:08:27 +02:00
Jan Käberich
727040c132 Update to new VID/PID from pidcodes 2023-04-17 23:38:24 +02:00
Jan Käberich
99c6d77ad8 Device protocol update: support device with up to 4 ports 2023-02-23 23:04:50 +01:00
Jan Käberich
a0c45d3c56 VFF device config update 2023-02-23 15:14:49 +01:00
Jan Käberich
9b4865dceb Renaming packet types, implementing different packet contents per hardware version 2023-02-20 13:08:31 +01:00
Andre Dunford
cc8256b4cc commit missed changes to VNA.cpp 2022-12-20 11:42:11 -08:00
Andre Dunford
916d6e3e38 refactor evaluation of standby waiting state 2022-12-20 11:14:02 -08:00
Andre Dunford
5bb6fdf686 Revert "evaluate AUX3 in standby state" 
This reverts commit ec5e0e208c.
 2022-12-20 09:11:13 -08:00
Andre Dunford
ec5e0e208c evaluate AUX3 in standby state 2022-12-20 01:16:22 -08:00
Andre Dunford
fc8eee58e7 relocate standby condition 2022-12-18 16:54:47 -08:00
Andre Dunford
795b1eb3fa respond to InitiateSweep with nack when misconfigured 2022-12-17 01:19:46 -08:00
Andre Dunford
08fa3fa0a0 implement sweep standby configuration 2022-12-16 23:41:59 -08:00
Andre Dunford
9b38a1fc3d implement optional device status updates 2022-12-05 22:29:33 -08:00
Andre Dunford
5bf824220e replace USB protocol literals with named constants 2022-11-29 00:44:27 -08:00
Jan Käberich
0c17288ece SA/GEN integration tests + bugfixes 2022-11-20 20:48:36 +01:00
Jan Käberich
ec6fae5822 Remove IFTable limitation, calculate 2.LO shift on the fly 2022-11-20 01:19:42 +01:00
Jan Käberich
df8fa25935 Increase settling time for PLLs 2022-11-19 16:26:38 +01:00
Jan Käberich
6e5f2635d1 Hardfault handler + FPGA abort/interrupt collision fix 2022-11-19 15:46:17 +01:00
Jan Käberich
a4b1978098 wait for lock on Si5351C 2022-11-17 12:05:52 +01:00
Jan Käberich
22542a81b6 attempt to restart USB communication 2022-10-31 22:14:59 +01:00
Jan Käberich
f3eb560d61 USB logging 2022-10-31 22:06:23 +01:00