[ECOS] RedBoot: patch to improve net timekeeping.
Mon Jan 22 15:11:00 GMT 2001
Here's a patch to net_io.c that changes the getc() routines
to call MS_TICKS() rather than CYGACC_CALL_IF_DELAY_US() when
waiting for input.
If a similar approach is used in the HAL's serial i/o routines,
it results in the system time being fairly accurate if the CPU
isn't heavily loaded. As long as you call MS_TICKS() when
you're in a busy-idle loop, the accuracy of the system time is
determined by the CPU usage: 10% CPU means the clock is 10%
slow. This should make it fairly useful for non-critical
NB: This changes the incremental wait in the net_io getc
routines from 100us to 1ms. If somebody really needs 100us
wiats, a second delay routine could be added to ticks.c
that delays for 100us and increments the "ticks" variable
every 10th call.
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