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serial: dump DMM packets during stream detection 

Regular operation of serial DMM drivers optionally can dump packet bytes
after the intialization phase has synchronized to the stream. Failure to
synchronize to the stream left developers without a dump, which complicates
research what went wrong.

Do dump packet content while the serial_stream_detect() routine tries to
synchronize to the stream. Use the spew level since the dump occurs upon
every attempt, which translates to: every received byte until a valid
packet was seen (or the synchronization phase expired).
This commit is contained in:
Gerhard Sittig 2018-10-08 17:07:07 +02:00 committed by Uwe Hermann
parent 75aaf967e3
commit e5fa47c1c9
1 changed files with 4 additions and 0 deletions
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4
src/serial.c
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@ -715,7 +715,11 @@ SR_PRIV int serial_stream_detect(struct sr_serial_dev_inst *serial,
time /= 1000; time /= 1000;
if ((ibuf - i) >= packet_size) { if ((ibuf - i) >= packet_size) {
GString *text;
/* We have at least a packet's worth of data. */ /* We have at least a packet's worth of data. */
text = sr_hexdump_new(&buf[i], packet_size);
sr_spew("Trying DMM packet: %s", text->str);
sr_hexdump_free(text);
if (is_valid(&buf[i])) { if (is_valid(&buf[i])) {
sr_spew("Found valid %zu-byte packet after " sr_spew("Found valid %zu-byte packet after "
"%" PRIu64 "ms.", (ibuf - i), time); "%" PRIu64 "ms.", (ibuf - i), time);