is_SetAutoParameter's pval1/pval2 are double* (8 bytes); set_auto_gain()/
set_auto_shutter() were passing a c_int (4 bytes), so the driver read
garbage past the buffer and rejected it -- this is what raised
UEyeException (surfaced as ophyd's "Subscription value callback
exception") when toggling auto gain on real hardware. Fixed to pass
c_double, matching the SDK's documented signature.
Also wrap the three hardware-write subscribe callbacks in try/except so
a driver failure logs clearly from IDSCamera instead of only via
ophyd's generic subscription-exception message.
Adds Camera.get_exposure_range()/get_pixel_clock()/
get_pixel_clock_range()/set_pixel_clock() (the max exposure time is
bounded by the current pixel clock) and matching IDSCamera
exposure_time_min/max config signals + USER_ACCESS wrappers, seeded on
connect, so the GUI can bound its exposure control to real hardware
limits instead of a placeholder range.
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