Release Version Notes for the SM200 Programming Interface

Support contact: aj@signalhound.com

- SM_API Version 2.1.5 (7/21/2020)
* Bug fix: Real-time measurements with span of <= 40MHz could produce NAN results.
* For real-time measurements with spans below 40MHz, the min sweep array is now calculated when min/max detector is selected.
  Prior to this, the min sweep array was simply the max array duplicated.
* Added smSyncErr status code.

- SM_API Version 2.1.4 (6/1/2020)
* Fixed bug associated with 1THz sweep speeds for the SM200C. Will work with firmware version 4.4.2.
  Download firmware updater at https://signalhound.com/support/product-downloads/sm200a-downloads/
* Added network error logging for the SM200C (Windows).

- SM_API Version 2.1.3 (5/8/2020)
* Increased socket SO_RCVBUF size on Linux. Should reduce intermittent data loss and connection issues.
* Timestamping improvements for low sample rate configurations.
* Defaults to 160MHz bandwidth for SM200C I/Q streaming.
* Added network error logging for the SM200C (Linux).

- SM_API Version 2.1.2 (4/8/2020)
* Additional support for firmware updates.

- SM_API Version 2.1.1 (4/2/2020)
* Bug fix: Properly handle nmeaLen parameter in smGetGPSInfo function.

- SM_API Version 2.1.0 (3/13/2020)
* Support for the SM200C.
* Device now reports GPS disciplined immediately after disciplining begins.
* Improved stability on GPS timestamping through improved PPS disciplining for long I/Q captures.
  - Using an SM200A with FW version 4.5.9 or greater.
  - Using an SM200B with FW version 4.5.12 or greater.
* Bug fix: Resolved issue where occassionally the GPS time would be reported ~17 seconds off.

- SM_API Version 2.0.2 (9/30/2019)
* Added support for SM200A/B LTE streaming I/Q sample rates (61.44MS/s). 
  - See smSetIQBaseSampleRate().
  - Requires firmware update 4.5.8 for SM200A and 4.5.11 for SM200B
* Improved GPS timestamping for streaming I/Q
* Bug fix: No longer undefined behavior when calling certain functions (such as GetGPSInfo) when
  there are actively queued sweeps.

- SM_API Version 2.0.1 (9/9/2019)
* Official support for SM200B.
  - Added 160MHz I/Q capture functions for SM200B. See SegIQ functions in API. (Segmented I/Q)

_ SM_API Version 2.0.0 (Internal build)
* Initial support for SM200B. 
  - Includes support for segmented I/Q captures.
* Added support for 16-bit complex short I/Q data. See smSetIQDataType().
* Added smGetIQScale() needed to convert full scale 16-bit complex shorts to calibrated 32-bit complex floats.
* smGetIQ() parameter 'iqBuf' has been changed to void* data type.
  - Will not break existing code that uses this function with 32-bit complex floats.
  - Required for new 16-bit complex short I/Q data acquisition.
* Removed smSetIQCaptureType() function.
* Bug fix: Linux connection issue hangs.

- SM_API Version 1.1.7 (12/5/2018)
* Improved timing on external triggering. 
* In conjunction with firmware version 4.5.6 external trigger timings in IQ acquisition will be more accurate and repeatable. 

- SM_API Version 1.1.6 (11/20/2018)
* Increase thread priority for USB acquisition threads to 'TIME_CRITICAL' on Windows operating systems. This should help alleviate USB data loss in high CPU conditions.

- SM_API Version 1.1.5 (9/25/2018)
* Reduced IQ streaming reconfiguration time.

- SM_API Version 1.1.4 (9/17/2018)
* Support for firmware version 4.5.5 which improves USB transfer reliability on newer Windows 10 computers.

- SM_API Version 1.1.3 (9/6/2018)
* Compiled with -fvisibility=hidden on Linux, should reduce global symbol collisions, particularly when linking with the bb_api as well on Linux.
* Bug fix: On Linux, forcing sweep speed to normal for certain sweeps should no longer segfault.
* Bug fix: On Linux, calling smGetIQParameters or smGetIQCenterFreq should no longer segfault when the device is not actively I/Q streaming.

- SM_API Version 1.1.2 (7/11/2018)
* Supports libusb backend for Linux.
* Ported to 64-bit Linux (Ubuntu 18.04LTS).
* Increase in DLL size due to third party static libraries.
* Bug fix for real-time measurement mode.

- SM_API Version 1.1.1 (6/21/18)
* Bug fix for narrow span, spur reject enabled sweeps.

- SM_API Version 1.1.0 (5/7/18)
* Added alpha frame component to real-time frame acquisitions. Used for persistence decay.
* smGetRealTimeFrame() function prototype changed to accomodate new functionality.
* Bug fix for real-time analysis. 

- SM_API Version 1.0.4 (3/15/2018)
* Added functionality for retrieving information about the GPS holdover correction.
* Increased the number of target-able devices to 9, primarily for internal calibration purposes.
* IQ streaming optimizations for decimations 1,2,4
* Bug fix for <= 40MHz span real-time measurements.

- SM_API Version 1.0.3 (2/12/2018)
* Official release

- SM_API Version 1.0.1 (9/27/2017)
* Pre-release for serial numbers 17249003 and 17249006.

- SM_API Version 1.0.0 (8/30/2017)
* Initial release.
* Pre-release for serial numbers 17249001 and 17249002.