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docs: Update protocol document to highlight its "compression" system 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2016-12-21 14:52:34 -05:00
parent 6f3bbafbbd
commit 189ac86b06
1 changed files with 31 additions and 10 deletions
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docs/Protocol.md
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@ -1,21 +1,40 @@
Klipper uses a binary protocol for communication between host and
firmware. This page provides a high-level description of that
protocol.
The Klipper transmission protocol can be thought of, at a high level,
as a series of command and response strings that are compressed,
transmitted over a serial line, and then processed at the receiving
side. An example series of commands in uncompressed human-readable
format might look like:
```
set_digital_out pin=86 value=1
set_digital_out pin=85 value=1
schedule_digital_out oid=8 clock=4000000 value=0
queue_step oid=7 interval=7458 count=10 add=331
queue_step oid=7 interval=11717 count=4 add=1281
```
See the [firmware commands](Firmware_Commands.md) document for
information on available commands. See the [debugging](Debugging.md)
document for information on how to translate a G-Code file into its
corresponding human-readable firmware commands.
This page provides a high-level description of the Klipper
transmission protocol itself. It describes how messages are declared,
encoded in binary format (the "compression" scheme), and transmitted.
The goal of the protocol is to enable an error-free communication
channel between the host and firmware that is low-latency,
low-bandwidth, and low-complexity for the firmware.
The protocol acts as a
Firmware Interface
==================
The Klipper transmission protocol can be thought of as a
[RPC](https://en.wikipedia.org/wiki/Remote_procedure_call) mechanism
between firmware and host. The firmware declares the commands that the
host may invoke along with the response messages that it can
generate. The host uses that information to command the firmware to
perform actions and to interpret the results.
Firmware Interface
==================
Declaring commands
------------------
@ -36,9 +55,11 @@ corresponding to the 'pin' and the second corresponding to the
'value'.
In general, the parameters are described with printf() style syntax
(eg, "%u"). In the above example, "value=" is a parameter name and
"%c" indicates the parameter is an integer. The parameter name is used
as documentation. In this example, the "%c" is used as documentation
(eg, "%u"). The formatting directly corresponds to the human-readable
view of commands (eg, "set_digital_out pin=86 value=1"). In the above
example, "value=" is a parameter name and "%c" indicates the parameter
is an integer. Internally, the parameter name is only used as
documentation. In this example, the "%c" is also used as documentation
to indicate the expected integer is 1 byte in size (the declared
integer size does not impact the parsing or encoding).