[turkmanovic]

OpenEPT 2.1.0

Release date: 2026-10-03

This release introduces a guided automatic calibration procedure for the Energy
Profiler Probe and completes the programmable load DAC calibration.

Highlights

• Automatic calibration wizard. A new guided procedure calibrates the voltage
  channel, the current channel and the programmable load from the real-time averaged
  measurements, computes every coefficient on its own, and writes a report of what it
  changed. Launched from the Calibration window with Start auto calibration while
  acquisition is running.
• Programmable load DAC calibration. The load now has its own offset and gain
  correction, calibrated against the already calibrated current channel, so a requested
  load current matches the current the board actually sinks.

Added

• Three-stage calibration wizard (voltage -> current -> load):
  • Voltage channel: disconnect the input, switch the ADC IN jumper to the
    reference, and tune the voltage correction to the reference automatically.
  • Current channel: zero the offset with the load disabled, then a multi-point
    span step that drives known currents and asks for the true reading from a
    reference meter to calibrate the current measurement, followed by a zero re-check.
  • Load channel: drives several currents (count and range derived from the shunt)
    and fits the load DAC with no user input.
• Internal or external reference selection at start. An external reference held on
  the input skips the disconnect-and-jumper steps for a faster run.
• Configurable point counts for the current span and the load fit, asked at start.
• Per-channel restart on failure - a problem restarts only the affected channel and
  keeps the coefficients already found.
• Live log panel inside the wizard with the full history of detections and tuned
  coefficients, and a final report listing only the coefficients that changed.
• "I am ready, continue" manual confirmation for the steps that wait on the user.

Changed

• Calibration window redesigned. No longer modal (the main Device view stays
  reachable), with the fields grouped into General ADC, Voltage channel, Current channel
  and Load calibration, plus the new Start auto calibration button. Store now also sends
  all nine coefficients, including the load DAC offset and correction, to the device.

Fixed

• Load calibration "working mode not supported". The wizard now drives the output
  directly through the device layer instead of the Energy Control window, resets any
  tripped protection, and enables both the load and the DAC before expecting current.
• Protections tripping during setup are now reset automatically instead of aborting
  the procedure.
• Load current was roughly halved relative to the requested value; fixed by adding
  the load DAC offset and gain correction.
• Store had no effect on the device; the calibration coefficients are now actually
  sent, not only applied in the application.

Firmware

• Load DAC offset and correction calibration parameters, applied in the
  current-to-voltage conversion and stored in the file system with the rest of the
  calibration.
• Control protocol: device param cal get reports DACOFF / DACCOR, and
  device param cal set accepts -dacoff / -daccor (both optional).
• cmparse: parsed argument values are always NUL-terminated, fixing wrong
  prescaler/period when a handler reuses the value buffer.

Upgrade notes

• After running the automatic calibration, open the Calibration window and press
  Store to persist the coefficients on the device - the wizard keeps them in the
  application only.
• The automatic calibration requires acquisition to be running and, for the current
  span, a reference ammeter.