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author | Gerhard Sittig <gerhard.sittig@gmx.net> | 2020-06-22 20:13:15 +0200 |
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committer | Gerhard Sittig <gerhard.sittig@gmx.net> | 2020-06-24 19:30:37 +0200 |
commit | 55a8021ad31e5b7e746dc71e9b71041920e62f17 (patch) | |
tree | 024111ed157221294760b8e8adbabb380ab199f8 | |
parent | b91f86e7b7c51e637dac58fd207ee2238d47e4d1 (diff) | |
download | sigrok-dumps-55a8021ad31e5b7e746dc71e9b71041920e62f17.tar.gz sigrok-dumps-55a8021ad31e5b7e746dc71e9b71041920e62f17.zip |
pjon/pjdl: add capture of minimal PJON frames over PJDL link layer
The PJON protocol can use several link layers. These captures run on
PJDL, demonstrate a minimal PJON frame (with TX info) and a response.
And also contain a few exceptional conditions: Glitches in the signal,
outside and inside of frames. Lack of recipient's response, too.
The snippets were extracted from a capture that was
Submitted-By: Julio Aguirre <jcallano@gmail.com>
-rw-r--r-- | pjon/README | 10 | ||||
-rw-r--r-- | pjon/pjdl/README | 40 | ||||
-rw-r--r-- | pjon/pjdl/pjon-pjdl-glitch-and-ack-and-failed-ack.sr | bin | 0 -> 1355 bytes | |||
-rw-r--r-- | pjon/pjdl/pjon-pjdl-incomplete-frame-missing-ack-repetitive.sr | bin | 0 -> 6472 bytes |
4 files changed, 50 insertions, 0 deletions
diff --git a/pjon/README b/pjon/README new file mode 100644 index 0000000..507bcd4 --- /dev/null +++ b/pjon/README @@ -0,0 +1,10 @@ +------------------------------------------------------------------------------- +PJON protocol stack, project homepage https://www.pjon.org/ +------------------------------------------------------------------------------- + +This is a collection of example PJON communication. Subdirectories contain +different types of communication (link layers, or setups). + +PJON protocol and PJDL link layer specs: +https://www.pjon.org/PJON-protocol-specification-v3.2.php +https://www.pjon.org/PJDL-specification-v4.1.php diff --git a/pjon/pjdl/README b/pjon/pjdl/README new file mode 100644 index 0000000..25423e9 --- /dev/null +++ b/pjon/pjdl/README @@ -0,0 +1,40 @@ +------------------------------------------------------------------------------- +PJON over PJDL +------------------------------------------------------------------------------- + +This is a collection of example PJON communication which uses the PJDL +link layer. Which does serial communication on a single wire, and the +reference library happens to implement it by means of software bitbang +(which affects the timing of signals on the wire). + + +Logic analyzer setup +-------------------- + +The capture was taken with a logic analyzer at a samplerate of 4MSa/s. +Communication is done on a single channel. + + Probe PJDL + ---------------- + 1 data + + +pjon-pjdl-glitch-and-ack-and-failed-ack.sr +------------------------------------------ + +Two STM32F103 (Blue Pill boards) run the example code which resides in +the examples/ARDUINO/Local/SoftwareBitBang/SendAndReceive/Device1/ and +Device2/ directories. Communication mode 1 translates to 44us and 116us +for data and pad bits. Device addresses are 44 and 45. The letter 'B' is +sent as the payload data in both directions. Synchronous responses get +requested, but one device won't respond. The capture also contains a few +glitches which as a byproduct exercise the decoder's robustness, and +recovery after synchronization loss. + + +pjon-pjdl-incomplete-frame-missing-ack-repetitive.sr +---------------------------------------------------- + +This is a longer capture taken from the above setup. Some of the glitches +happen to fall into a PJON frame's period and can prevent or can disturb +the accumulation of the frame's content. diff --git a/pjon/pjdl/pjon-pjdl-glitch-and-ack-and-failed-ack.sr b/pjon/pjdl/pjon-pjdl-glitch-and-ack-and-failed-ack.sr Binary files differnew file mode 100644 index 0000000..e130f90 --- /dev/null +++ b/pjon/pjdl/pjon-pjdl-glitch-and-ack-and-failed-ack.sr diff --git a/pjon/pjdl/pjon-pjdl-incomplete-frame-missing-ack-repetitive.sr b/pjon/pjdl/pjon-pjdl-incomplete-frame-missing-ack-repetitive.sr Binary files differnew file mode 100644 index 0000000..c6aaf62 --- /dev/null +++ b/pjon/pjdl/pjon-pjdl-incomplete-frame-missing-ack-repetitive.sr |