i2c_packet: new decoder for forming packets from i2c data

[sespivak]

i2c_packet protocol decoder stacks with i2c PD and allows to combine several data bytes from "START" i2c condition until "STOP" and puts this data in a dedicated annotation.

Possible data formats for data output are hex, ascii, dec, bin and oct.

Example of logging data packets with the sigrok-cli:

$ sigrok-cli -d fx2lafw -c samplerate=1M --continuous \
             -P i2c:scl=D2:sda=D3,i2c_packet:transaction=yes \
             -A i2c_packet
i2c_packet-1: 0x08 WR: 04 [SR] 0x08 RD: 05 00 00 04 11 00 00 0A 00 01
i2c_packet-1: 0x08 WR: 04 [SR] 0x08 RD: 05 00 00 04 11 00 00 0A 00 01
i2c_packet-1: 0x08 WR: 04 [SR] 0x08 RD: 05 00 00 04 11 00 00 0A 00 01

Tests added in PR sigrokproject/sigrok-test#19

[jk-ozlabs]

I get the following error when running pulseview:

srd: Failed to load decoder i2c_packet: annotation class/row IDs contain duplicates

It looks like the annotations and annotations_rows entries need to be distinct.

This helps for me:

diff --git a/decoders/i2c_packet/pd.py b/decoders/i2c_packet/pd.py
index ab365cc..5c299c7 100644
--- a/decoders/i2c_packet/pd.py
+++ b/decoders/i2c_packet/pd.py
@@ -64,7 +64,7 @@ class Decoder(srd.Decoder):
         ('data', 'Data'),
     )
     annotation_rows = (
-        ('data', 'Data', (Ann.DATA,)),
+        ('packet', 'Packet', (Ann.DATA,)),
     )
 
     def __init__(self):

[sespivak]

@jk-ozlabs Thank you, this error fixed.