Ripyl protocol decode library

Ripyl is a library for decoding serialized data collected from an oscilloscope or logic analyzer. It supports a variety of protocols and can be readily extended with new protocols. Ripyl is useful for offline decoding of data collected on instruments with no built in support for decoding or lacking support for more advanced protocols.

It can process a waveform like this:

... and produce an annotated result like this:

Using Ripyl is as simple as follows:

import ripyl
import ripyl.protocol.uart as uart

raw_samples, sample_period = read_samples_from_your_oscilloscope()
txd = ripyl.streaming.samples_to_sample_stream(raw_samples, sample_period)
records = list(uart.uart_decode(txd, bits=8, parity='even', stop_bits=1))

The library provides decoded information in an easily traversed tree detailing the time and data for each sub-element of a protocol transmission.

Take a look at the online documentation for more information on Ripyl's capabilites.

Requirements

• Python 2.7 or 3.x
• SciPy >= 0.11.0
• Numpy >= 1.7.0

Optional libraries

• Matplotlib for plotting support
• Cython >= 0.17 for improved performance

Features

• Multi-protocol support:

  CAN	HSIC	I2C	LIN
  ISO 9141	ISO 14230	NEC	PS/2
  RC5	RC6	SIRC	SPI
  UART	USB 2.0

• Protocol simulation

• Annotated plotting

• Layering of protocols

• Automated parameter analysis (logic levels, baud rate)

Download

You can access the Ripyl Git repository from Github. Packaged source code is also available for download.

Installation

Download the compressed source archive for your platform and extract its contents. On all platforms you can install from a command prompt. From an administrative or root shell type the following command from the directory containing the decompressed archive.

> python setup.py install

This will install a copy of Ripyl library to the Python site-packages or dist-packages directory and enable the ripyl_demo script.

On some Unix platforms you may need to install to your home directory or use root access through sudo.

> python setup.py install --home=~

> sudo python setup.py install [sudo] password for user: *****

Cython

The Ripyl library has been designed with optional Cython support. By default the installation script will detect and enable Cython if it is present. You can force Cython support off by passing the --without-cython argument to setup.py. The status of the Cython configuration is written into a ripyl.cfg file at build time. You can enable or disable the use of Cython after Ripyl is installed by setting the RIPYL_CYTHON environment variable to a true or false value as desired:

> export RIPYL_CYTHON=1

Licensing

This library is open sourced under the LGPL 3 license. See LICENSE.txt for the full license.