Changes to support RW1990 timing. #139
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RW1990 needs longer recovery time to write new data.
This was originally developed as a means of detecting cloned iButtons for an access control application. If I try to write an invalid ID (eg bad CRC) to an iButton, then read it and I read a bad CRC I consider the iButton a clone and do not open the lock.
Operation was investigated using a DSO to observe pulse timing correlated with write success. Tested on three differently sourced RW1990, two different case markings.
Owen