the seek offset of files can get badly mucked up when it crosses
cluster boundaries. We need to fix this in NuttX, but meanwhile this
works around the bug. It seems that doing a lseek(fd, 0, SEEK_CUR)
fixes the seek offset in the file.
The bug seems to first happen at an offset of 315392. It also
doesn't happen every time - it is more likely to happen on the first
log download after booting
This method allows temporarily suspending writes to the dataflash which
will be used in ArduCopter to ensure no messages are written while the
copter is disarmed
this is an attempt to avoid microSD card corruption. The most common
corruption is two 'logs' directories, which may indicate an issue with
trying to create it a 2nd time.
this allows us to remove the display functions in the vehicle code,
and also allows us to store the format of a log file in the log. It
also stores the parameters used in a flight, rather than the
parameters set at the time the log is dumped
Andrew Tridgell
Randy Mackay