rkrajnc / openlogicbit

Open-source Logic Analyzer gateware for various FPGA dev boards/replacement gateware for commercially available logic analyzers.

open-logic-bit

Open-source Logic Analyzer gateware for various FPGA dev boards/replacement gateware for commercially available logic analyzers.

Github: https://github.com/ultraembedded/openlogicbit

Aims

A logic analyzer project which aims to provide reliable, high speed (100MHz+), large capture depth, open-source gateware that can be used on a FPGA development board you already own, or as replacement gateware for commercial logic analysers that do not work with open-source tools such as sigrok.

This project aims to support FPGA boards with 10's MBs of capture memory (such as DDR3), which also have high-speed USB interfaces from which to download the captured data.

There are a number of other open-source logic analyzer projects, but these mostly focus on using limited internal FPGA memories (embedded block RAMs), and low-performance host interfaces (UART).

Features

• 16, 24, 32 input channels supported.
• Run-length encoded (RLE) compression to extend the sample buffer depth.
• Support for boards with large memories (DDR, SDRAM).
• Up to 32 triggers supporting edge, level, value match modes.
• Support for boards with FTDI sync FIFO mode support (FT232H, FT2232H).
• Support for external clock sources.
• Continuous or one-shot capture modes.
• libsigrok support available (enabling support for Sigrok, Pulseview).

A screenshot of Sigrok capturing a SPDIF signal at 100MHz with open-logic-bit running on a Digilent Digital Discovery;

Supported Boards

• Digilent Digital Discovery
• More to come...

Software

Compatible with Sigrok (via libsigrok), based on the following fork;

• https://github.com/ultraembedded/libsigrok

open-logic-bit also contains a built in test mode;