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jtag: clean up jtag_sleep, handle short sleeps correctly via usleep 

short sleeps are handled via usleep, longer sleeps we round up
to nearest ms.

There was a bug in jtag_sleep() in that it would round *down*
to nearest ms, thus making all <1ms sleeps 0. Found by inspection
rather than symptom.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
This commit is contained in:
Øyvind Harboe 2011-03-03 09:14:30 +01:00
parent 689c244389
commit bb0d11cba9
1 changed files with 8 additions and 1 deletions
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9
src/jtag/core.c
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@ -871,9 +871,16 @@ static int jtag_reset_callback(enum jtag_event event, void *priv)
return ERROR_OK;
}
/* sleep at least us microseconds. When we sleep more than 1000ms we
* do an alive sleep, i.e. keep GDB alive. Note that we could starve
* GDB if we slept for <1000ms many times.
*/
void jtag_sleep(uint32_t us)
{
alive_sleep(us/1000);
if (us < 1000)
usleep(us);
else
alive_sleep((us+999)/1000);
}
/* Maximum number of enabled JTAG devices we expect in the scan chain,