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Changed backoff strategy for short reads.

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Back off was exponential starting at 10ms, which for high baud
rate and no flow-control connections might cause buffer overrun.
This was causing problems when reading Cochran DCs, the hearbeat
byte was being missed.

Signed-off-by: John Van Ostrand <john@vanostrand.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
John Van Ostrand 2017-09-05 17:07:55 -04:00 • committed by Dirk Hohndel
parent 024b61ca04
commit 928621357c
1 changed files with 0 additions and 7 deletions
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7
core/serial_ftdi.c
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@ -395,19 +395,12 @@ static dc_status_t serial_ftdi_read (dc_custom_io_t *io, void *data, size_t size
ERROR (device->context, "%s", ftdi_get_error_string(device->ftdi_ctx));
return DC_STATUS_IO; //Error during read call.
} else if (n == 0) {
// Exponential backoff.
if (slept >= timeout) {
ERROR(device->context, "%s", "FTDI read timed out.");
return DC_STATUS_TIMEOUT;
}
serial_ftdi_sleep (device, backoff);
slept += backoff;
backoff *= 2;
if (backoff + slept > timeout)
backoff = timeout - slept;
} else {
// Reset backoff to 1 on success.
backoff = 1;
}
nbytes += n;