PWM Serial Analyzer

PWM Serial Analyzer plugin for Saleae Logic.

This can decode simple serial protocols where there is a pulse per bit, and the width of the pulse encodes the value of the bit. Some example protocols/devices that use this encoding:

• Texas Instruments HDQ, used on their battery monitor ICs
• Dallas 1-Wire
• Various RF-controlled power outlets and other 433 MHz devices
• WS2812 and similar addressable LED strips

Getting Started

The following documentation describes getting this analyzer building locally. For more detailed information about the Analyzer SDK, debugging, CI build, and more, checkout the readme from the Sample Analyzer repository:

https://github.com/saleae/SampleAnalyzer

MacOS

Dependencies:

• XCode with command line tools
• CMake 3.13+

Installing command line tools after XCode is installed:

xcode-select --install

Then open XCode, open Preferences from the main menu, go to locations, and select the only option under 'Command line tools'.

Installing CMake on MacOS:

1. Download the binary distribution for MacOS, cmake-*-Darwin-x86_64.dmg
2. Install the usual way by dragging into applications.
3. Open a terminal and run the following:

/Applications/CMake.app/Contents/bin/cmake-gui --install

Note: Errors may occur if older versions of CMake are installed.

Building the analyzer:

mkdir build
cd build
cmake ..
cmake --build .

Ubuntu 18.04+

Dependencies:

• CMake 3.13+
• gcc 4.8+

Misc dependencies:

sudo apt-get install build-essential

Building the analyzer:

mkdir build
cd build
cmake ..
cmake --build .

Windows

Dependencies:

• Visual Studio 2019
• CMake 3.13+

Visual Studio 2019

Note - newer and older versions of Visual Studio are likely to work.

Setup options:

• Workloads > Desktop & Mobile > "Desktop development with C++"

Note - if CMake has any problems with the MSVC compiler, it's likely a component is missing.

CMake

Download and install the latest CMake release here. https://cmake.org/download/

Building the analyzer:

mkdir build
cd build
cmake .. -A x64

Then, open the newly created solution file located here: build\pwm_serial_analyzer.sln

The built analyzer DLLs will be located here:

build\Analyzers\Debug

build\Analyzers\Release

For debug and release builds, respectively.

Output Frame Format

Frame Type: "data"

Property	Type	Description
data	byte array	The bits of the decoded transmission are stored in this array with the most significant bits first.
error	str	(optional) Present if an error was detected when decoding this transmission

A single bit