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Handle timeouts while receiving the first package.

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Instead of ending the transmission, an error is reported.
This commit is contained in:
Jef Driesen 2007-11-03 20:27:14 +00:00
parent 316ec12fef
commit e1f12108cb
1 changed files with 10 additions and 4 deletions
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14
suunto_vyper.c
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@ -474,10 +474,16 @@ suunto_vyper_read_dive (vyper *device, unsigned char data[], unsigned int size,
unsigned char reply = 0;
int rc = serial_read (device->port, &reply, 1);
if (rc != 1 || memcmp (command, &reply, 1) != 0) {
// If no data is received at this point (timeout),
// we assume the last package was already received
// and the transmission can be finished.
if (rc == 0)
// If no data is received at this point (a timeout occured),
// we assume the last package was already received and the
// transmission should be finished. This is not 100% reliable,
// because there is always a small chance that more data will
// arrive later (especially with a short timeout). But I'm not
// aware of a better method to detect the end of the transmission.
// Only for the very first package, we can be sure there was
// an error, because it makes no sense to end the transmission
// if no data was received so far.
if (rc == 0 && nbytes != 0)
break;
fprintf (stderr, "%s:%d: Unexpected answer start byte (%d).\n", __FILE__, __LINE__, reply);
return -1;