Improve frame rate limiting #8
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Some cameras default to automatic frame rate mode when power-cycled. This makes the acquire period limitation ineffective, as the parameter is ignored by the camera firmware. Enforce manual frame rate setting at IOC start-up when limiting frame rate. Note that the overwritten record already contains `PINI=YES` to write this to hardware on `iocInit`. Fixes: d5caf77 ("database: add option to limit camera frame rate.")
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Both AcquirePeriod and FrameRate can be used to define frame rate. Keep their limits consistent by forwarding the inverse of period limit to the FrameRate record. A better implementation of this feature would to have a FrameRateLimit record which forwards for both AcquirePeriod's and FrameRate's DRVL and DRLH fields. Having the limit specified in terms of frame rate would however would require changing the configuration parameter defined in the template st.cmd. To keep backward compatibility, the frame rate is computed based on the value of the AcquirePeriod.DRVL instead. Changing it at runtime requires reprocessing FrameRateLimitFwd to forward to FrameRate.DRVH.
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Frame rate limits have been improved to also be applicable to
FrameRatePV and ensure camera mode is set to use manually configurable frame rate.