[sigrok-dumps.git] / i2c / a2_dummy_write / README

-------------------------------------------------------------------------------
Dummy I2C writes
-------------------------------------------------------------------------------

This an example capture of some dummy I2C traffic, where the master writes
to a slave at address 0x51 (or 0x2a, if the read/write bit is included)
in an infinite loop. The slave does not respond.


Logic analyzer setup
--------------------

The logic analyzer used for capturing was a ChronoVu LA8 at a sample rate
of 1MHz. The logic analyzer probes were connected to the I2C pins like this:

  Probe       RTC chip pin
  ------------------------
  0 (green)   SCL
  1 (orange)  SDA


Data
----

This is what the decoded data should look like:

 - S Wr:0xa2 A 0x55 A 0x66 A P

 - The abbreviations used above: S = Start, Wr = Write, A = ACK, P = Stop

The sigrok command line used was:

  sigrok-cli -d 0:samplerate=1mhz --samples 8388608 \
             -p '1=SCL,2=SDA' -o a2_dummy_write.sr
Commit	Line	Data
2c954388 UH	1	-------------------------------------------------------------------------------
	2	Dummy I2C writes
	3	-------------------------------------------------------------------------------
5f09f8b6	4
2c954388 UH	5	This an example capture of some dummy I2C traffic, where the master writes
	6	to a slave at address 0x51 (or 0x2a, if the read/write bit is included)
	7	in an infinite loop. The slave does not respond.
	8
	9
	10	Logic analyzer setup
	11	--------------------
	12
	13	The logic analyzer used for capturing was a ChronoVu LA8 at a sample rate
	14	of 1MHz. The logic analyzer probes were connected to the I2C pins like this:
	15
	16	Probe RTC chip pin
	17	------------------------
	18	0 (green) SCL
	19	1 (orange) SDA
2c954388 UH	20
	21
	22	Data
	23	----
	24
	25	This is what the decoded data should look like:
	26
	27	- S Wr:0xa2 A 0x55 A 0x66 A P
	28
	29	- The abbreviations used above: S = Start, Wr = Write, A = ACK, P = Stop
	30
	31	The sigrok command line used was:
	32
	33	sigrok-cli -d 0:samplerate=1mhz --samples 8388608 \
	34	-p '1=SCL,2=SDA' -o a2_dummy_write.sr
095af1a5	35