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Signal analysis using Sigrok

Introduction

Sigrok is an open-source software suite of signal analysis tools compromised of signal capture, protocol decoders and graphical tools. Sigrok's hardware support is pretty extensive and it's growing [2].

Installing

To install Sigrok on Ubuntu 14.04, enable their PPA repository:

sudo add-apt-repository ppa:jorik-kippendief/sigrok
sudo apt-get install pulseview

PulseView

Sigrok has command-line utilities for signal capture, but for newbies there is PulseView tool:

http://sigrok.org/wimg/e/ee/PulseView_I2C_DS1307_Decode.png

PulseView can parse various protocols such as I²C, SPI, UART etc.

Salea logic analyzer clones

Salea logic analyzer is a Cypress FX2 chipset based logic analyzer which can record up to 8 channels at 24MHz ranging from 0V to 5V.

http://sigrok.org/wimg/0/02/Mcu123_saleae_logic_clone_package_contents.jpg

Salea logic analyzer can sample 8 channels at 24MHz.

It has been discontinued by Salea but its clones are still available, anything with that particular chipset works. In order to use that chipset with Sigrok tools firmware for the logic analyzer has to be installed, otherwise you get "Firmware upload failed" once you fire up PulseView:

sudo apt-get install sigrok-firmware-fx2lafw

Salea logic analyzer clones can be purchased at eBay for less than 8€ per item [1].

[1]http://www.ebay.com/itm/251637912969

Summary

Sigrok tools in conjunction with Salea logic analyzer clone can be used to interface FPGA design with already existing hardware and debug the design.

[2]http://sigrok.org/wiki/Supported_hardware