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Handle null packages correctly.

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Abort the transmission and discard the data if a null package is 
received at the end of the internal ring buffer.
This commit is contained in:
Jef Driesen 2007-11-04 13:12:50 +00:00
parent e1f12108cb
commit de3fb61c0a
1 changed files with 8 additions and 0 deletions
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8
suunto_vyper.c
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@ -528,6 +528,14 @@ suunto_vyper_read_dive (vyper *device, unsigned char data[], unsigned int size,
return -1; return -1;
} }
// A null package (length zero) indicates the DC reached the end of
// its internal ring buffer and the transmission should be aborted.
// The remaining data of the current dive is overwritten with newer
// data and thus not transmitted by the DC. Therefore, the data that
// was already received is discarded.
if (len == 0)
return 0;
// If a package is smaller than $SUUNTO_VYPER_PACKET_SIZE bytes, // If a package is smaller than $SUUNTO_VYPER_PACKET_SIZE bytes,
// we assume it's the last packet and the transmission can be // we assume it's the last packet and the transmission can be
// finished early. However, this approach does not work if the // finished early. However, this approach does not work if the