Arduino logic analyzer

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arduino logic analyzer

But a USB logic analyzer LA is only as useful as the software required to configure and monitor the tool. There are a few software options available for this USB logic analyzer; in this tutorial we aim to familiarize you with sigrok's PulseView.

The project includes:. Download the latest PulseView release from sigrok's Downloads page. Here are direct links for the latest Windows, Mac, and Linux downloads:. The Mac installer is a binary disk image DMGwhich can be dragged into your Applications folder, for example. You should see faint red and green LEDs illuminate under the sticker. With the sampling parameters set as default -- 1M samples, 20kHz -- it'll take almost a minute to gather all million samples. You can hit "Stop" to end the scan early.

Unless you've already connected a few channels and grounds, this first scan will probably not be that interesting. Here's a fun, tormenting Arduino sketch you can load to help familiarize yourself with PulseView's capabilities:. Before scanning, bump up the sample rate to 1MHz and change the sample quantity to 1 M samples.

Depending on what you're trying to analyze, these dropdowns may get a lot of use. With those values set, hit Run. You should be greeted with a seconds worth of samples, and a few blips on the D0 channel every ms. Zoom into one of the blips. Now it's your job to guess the baud rate!

arduino logic analyzer

The Show cursors pair of blue flags icon tool can be useful for measuring time. Click that, then try to place the cursors around one bit of the transmission.It is a really useful tool for debugging circuits and communications links. However, the cost of brand-name logic analyzers runs into hundreds of dollars and can be really hard to justify for hobby use. A logic analyzer converts captured data about digital signals into timing diagrams, protocol decodes, state machine traces, assembly language, or, for advanced analyzers, correlate assembly with source-level software.

Logic analyzers have triggering capabilities, and are great for visualizing timing relationships between mutiple signals in a digital system. A logic analyzer is composed of two major components — the data collection hardware and the signal visualization software. As a data set is captured it is displayed as simple digital traces shown as square waveforms or state listings or can be analyzed by protocol decoders into logical data streams.

This means sigrok also supports digital multimeters, oscilloscopes and data collection devices. The PulseView software is regularly updated and has gained significant features and functionality in the two years I have been using it. It supports stacked protocol decoderswith each release generally able to handle new protocols. The figure above shows the PulseView window in demo mode.

I use the Windows version, downloaded as an install set from the distribution site. Versions exist for all major OS and all are free.

Low Cost DIY Logic Analyzer

Logic Analyzer data collection hardware supported by sigrok is extensive and varied, with many inexpensive options easily obtained from online suppliers like eBay, AliExpress, DealXtreme, etc. The majority of the hardware provides 8 data collection channels, allowing 8 digital signals to be analyzed.

arduino logic analyzer

This is documented on the hardware page, with a link to the appropriate driver software download and install instructions. I missed this at first. PulseView is installed by the Windows installer. The software automatically recognizes the data collection hardware and the experience is pretty smooth and painless. An example of the software in use is shown in the graphic below.

PulseView is being used with the SPI protocol decoder — note that the raw digital signals are decoded into more relevant byte values. In conclusion, PulseView coupled with inexpensive hardware creates a very functional logic analyzer. While professional setups may include more functionality, hobby or casual users should find this near-free setup more than adequate. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account.

You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. Close Menu Tools and Utilities. Geek Humour. Component Parts A logic analyzer converts captured data about digital signals into timing diagrams, protocol decodes, state machine traces, assembly language, or, for advanced analyzers, correlate assembly with source-level software.This project started as a simple experiment.

The Timer1 Input Capture Unit. It allows our Arduino UNO's microcontroller to detect a signal edge, store a timestamp, and trigger an interrupt, all in hardware.

I then wondered in which application it could be useful, and how to test it. As I want to get a logic analyzer for some time now, I decided to try implementing one in my Arduino UNO board, just to test the feature, and see if we can get good results out of it. I am not the only one that had this idea, and you will find plenty of them by just googling "Arduino Logic Analyzer". At the beginning of the project, as it just started as an experiment, I wasn't even aware that people already made it, and was impressed by the good results they achieved with this little piece of hardware.

However, I couldn't find another project using the input capture unit, so if you have already seen this, let me know!

It will finally have a samples memory depth, and was able to successfully capture a bauds UART message I didn't really tested it at higher speeds.

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This instructable contains both the "how it works" and "how to use it" parts of this project, so for those that are not interested by the technical side, you can directly jump to the step 4. The code for both the Arduino UNO and web interface can be found here. You will also need the p5.

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The idea is simple. You choose the capture settings, and click on "acquire". The web interface will send them to the p5. The p5. But it allows me to start a capture and retrieve my data back, which is what it has been designed for, so I think its fine.

arduino logic analyzer

For more serious analysis work, I import my records into PulseViewwhich is easy to use and offers a good set of features and protocol decoders, as we will see later. The Arduino UNO's input capture unit can be configured to use different clock divisions, thus reducing the resolution, but increasing the delay before overflow. It can also triggers on rising, falling or both edges to start capturing the data. I wrote and compiled the sketch with the Arduino IDE. I then made some functions to ease a bit its usage in the future, like the one to set the clock division named "setTim1PSC ".

I also wrote functions to activate and deactivate the Timer1 input capture unit and overflow interrupts. I added the "samples" arraywhich will hold the data acquired.

It is a global array that I set to "volatile" to prevent the compiler to make optimizations and put it in flash, as it was doing during my first compilations.

We stop capturing at values, but as the test is done outside of the interrupts for obvious speed reasons, I chose to keep 10 more values to prevent overflow. We are already at a high memory usage, and I didn't want to add more sample capacity, as it could cause weird behaviors due to too few memory space.

In my quest to always increase execution speed, I used function pointers instead of if statements inside the interrupts, to reduce their execution time to a minimum. The capture pin will always be the Arduino UNO number 8as it is the only one connected to the Timer1's input capture unit.

The capture process is shown on the image above. We then process those settings by configuring the right registers to capture on the chosen edge, and use the right clock division. In this interrupt we put the ICR1 register value into our "samples" array, and increment the index for the next capture.

When the Timer1 or the array overflows, we disable the capture interrupt, and send the data back to the web interface through UART. I decided to use a pin change interrupt to trigger the capture, as the input capture unit only allows to capture on one or the other edge, not both.

It also causes a problem when you want to capture both edges. My solution has then be to invert the bit that controls the edge selection in the input capture control register at each sample retrieved.Not a member?

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Max 25 alphanumeric characters. OK, I'm done! Join this project. Similar projects worth following. View Gallery. Description This Arduino sketch implements a SUMP protocol compatible logic analyzer for the Arduino board supports up to 6 channels consisting of digital pins On the Arduino Mega board 8 channels are supported and 7k of samples. Pins Port A are used on a Mega.

It is easy to use, just load the sketch and fire up the OLS client.When I worked at Intel as a hardware designer, I used a logic analyzer to debug microprocessors and chipsets.

A logic analyzer is a machine that connects to your circuit and converts what's happening in the circuit into a waveform on a screen. It lets you visually inspect how different parts of the circuit behave and interact with each other over time, which can expose the source of bugs. I recently ran into a rather sneaky bug in a circuit I'm building.

This project is practically an academic decathlon of programming languages, IDEs, and software packages. As a good citizen of Instructables, I tested as best I could and avoided hacking trial-and-error solutions. But my validation resources are limited. Hopefully I designed within specifications well enough that you won't encounter any compatibility issues. Fingers crossed. The stack starts with HTML5 and client-side JavaScript controls to handle all the button clicks and scroll events from the user interface.

The JS client communicates with the localhost server running node. In addition to serving the user interface, the node. The server reformats the data into a JSON object and sends it to the client via a socket. This complex stack uses a variety of API's, but the code is fairly short barely a hundred lines for each module. I'll explain each layer in the stack in the following sections.

The index. In the panel, a configuration menu appears on the left-hand side, and the screen canvas on the right hand side, with a summary line beneath the configuration. The summary line provides a brief English translation of what will happen when you press Start. The configuration menu is a match of the Arduino sketch functionality: each control corresponds to a TTY config command to which the Arduino responds.

We'll talk more about the controls later during the Arduino sketch. For now, it is only important to remember that the input controls are converted into a command string and sent to the Arduino when you press the Start button. Every time you press a control, the status bar updates with a description of what will happen, and if appropriate, a time estimate.

Pressing Start causes the JS to compile the input controls into a command string and send it off to the server, and changes the Start button to Wait. Currently there's no way to stop the execution since the Arduino ignores the serial port while sampling. When the sampling finishes, the server sends the data back to the client JS using a socket. The last step in the push handler renders the data to the canvas and switch the Wait button back to Start. A singleton JavaScript object named viewport manages the canvas and renders the channels' data.

During renderthe viewport object scales the data to fit the screen, since the canvas can handle subpixel coordinates nicely.

Arduinolyzer.js: Turn Your Arduino Into a Logic Analyzer

This means if the Arduino collected more samples than the width of the screen, the waveforms may appear as solid blocks. To address this problem, I added zoom buttons to expand the data. I originally had coded markers and a time axes, but I removed them because the code was blowing up. I wanted the code to be as small as possible. I'll leave it to the reader to make aesthetic modifications. However, having a time-axis does improve usability when zooming: you won't lose your place as easy.

Instead, I added some simple grey rectangles surrounding the channel waveforms, making it easier to identify high and low signals that don't change. This is all done in about a hundred lines of code thanks to existing npm modules.

I didn't have any problems, but I don't have that feeling of really understanding it yet, which makes me uneasy. Sometimes the debug console has weird characters in it when the Arduino boots. It could be due to the TTY not being flushed, or it could be due to something I don't understand about serial port timing.Hello and Welcome!

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Added to your shopping cart. Do you need to discover a UART's mysterious baud rate? Or do you want to reverse engineer an SPI protocol? These all sound like jobs for a logic analyzer! This 8-channel USB Logic Analyzer with support for sampling rates of up to 24MHz provides a good while economic option making it a great tool for quickly diagnosing most communication issues we encounter.

These analyzers will work with both 3. This logic analyzer works with PulseView -- an open-source, cross-platform signal analysis software suite. The analyzer ships with Female-To-Female jumper wires. If you're using an Uno or board with female headers we recommend picking up a handful of Male-To-Male jumpers to connect the analyzer to the female headers.

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics. Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type.

Also, you may need a power supply that? See all skill levels. We welcome your comments and suggestions below.Pages: [1] 2 Read times previous topic - next topic. SUMP compatible logic analyzer code for Arduino. I recently implemented a logic analyzer compatible with the SUMP protocol. It might work fine on the ATmega but I haven't tested it. I'm using a Duemilanove. You will have to disable auto reset to make this work. You absolutely need a 16MHz clock for accurate data.

I haven't looked at making a version for other clock speeds but you can file a request at GitHub. I'm very interested to hear from you if you try it on your hardware and find it useful or have trouble.

I have done limited testing of multiple channels as well as basic triggering. If something doesn't work I would appreciate some feedback. There are various methods to do this, some boards have a jumper, others require you to cut a trace. Make sure it is really Ohm or you may damage your board. Please try it out and report back.

I updated this code today. It now fully supports recording samples. I had accidentally defined the samples as integers and overlooked this fact until this weekend.

EEVblog #1018 - ZeroPlus Logic Analysers

Note that I recently bought a "Seeeduino V2. It works really well with this code. Now that I have tried both, I definitely prefer an auto-reset disable switch or jumper over the ohm resistor method. I was looking forward this for a while. Finally, we have Arduino based logic analyzer with proper GUI! I appreciate your effort and will try soon. Let me know how it works for you.

Maryam mohebbi

I still need to work on triggering, but the basic logic analyzer functionality is there. Once the profile is correct and Jawi adds it, the next release of his client should have better support.

If you want to use the original SUMP client you'll need to disable auto-reset, but really Jawi's client is the way to go. Tried and works great. It was a bit hard to catch sparse I2C signal without triggering but it works. I was planing to buy the bus pirate as a logic analyzer, now I don't need it. Looking forward to see trigger and proper device profile. I don't even bother to try original SUMP, since alternative one look better.


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