{"id":2832,"date":"2021-04-20T08:24:57","date_gmt":"2021-04-20T06:24:57","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=2832"},"modified":"2021-04-25T17:23:32","modified_gmt":"2021-04-25T15:23:32","slug":"a-flexible-arduino-sump-logic-analyzer-library","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2021\/04\/20\/a-flexible-arduino-sump-logic-analyzer-library\/","title":{"rendered":"A flexible Arduino SUMP Logic Analyzer Library"},"content":{"rendered":"<p>Recently, when I started to research the topic of <a href=\"https:\/\/en.wikipedia.org\/wiki\/Logic_analyzer\">Logic Analyzers<\/a>, I found the incredible <a href=\"https:\/\/sigrok.org\/wiki\/PulseView\">PulseView Project<\/a>. However, I did not want to invest in additional hardware but just use one of my favorite microprocessors (ESP32, Raspberry Pico) as capturing device.<\/p>\n<p>There are quite a few logic analyzer projects with a similar goal:<\/p>\n<ul>\n<li><a href=\"https:\/\/github.com\/gillham\/logic_analyzer\">gillham\/logic_analyzer<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/gamblor21\/rp2040-logic-analyzer\">gamblor21\/rp2040-logic-analyzer<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/EUA\/ESP32_LogicAnalyzer\">EUA\/ESP32_LogicAnalyzer<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/Ebiroll\/esp32_sigrok\">Ebiroll\/esp32_sigrok<\/a><\/li>\n<\/ul>\n<p>However all of them are geared for <strong>one specific architecture<\/strong> and therefore are <strong>not portable<\/strong>.<\/p>\n<p>I wanted to come up with a better design and provide a <a href=\"https:\/\/pschatzmann.github.io\/logic-analyzer\/html\/annotated.html\">basic C++ Library<\/a> that implements the <a href=\"https:\/\/www.sump.org\/projects\/analyzer\/protocol\/\">SUMP protocol<\/a> and clearly separates the generic functionality from the processor specific in order to support an <strong>easy rollout to new architectures<\/strong>: The only common precondition is the <strong>Arduino API<\/strong>.<\/p>\n<p>I am currently supporting<\/p>\n<ul>\n<li>AVR Processors<\/li>\n<li>ESP32<\/li>\n<li>ESP8266<\/li>\n<li>Raspberry Pico<\/li>\n<\/ul>\n<h1>The Arduino Sketch<\/h1>\n<p>The basic <strong>Arduino Sketch<\/strong> for the logic-analyzer is quite simple. We just need to call the begin method on a <a href=\"https:\/\/pschatzmann.github.io\/logic-analyzer\/html\/classlogic__analyzer_1_1_logic_analyzer.html\">LogicAnalyzer<\/a> object and add the command handler in the loop(). The provided implementation just uses the default values which are defined in the config:<\/p>\n<pre><code>#include \"Arduino.h\"\n#include \"logic_analyzer.h\"\n\nusing namespace logic_analyzer;  \n\nint pinStart=START_PIN;\nint numberOfPins=PIN_COUNT;\nLogicAnalyzer logicAnalyzer;\nCapture capture(MAX_FREQ, MAX_FREQ_THRESHOLD);\n\nvoid setup() {\n    Serial.begin(SERIAL_SPEED);  \n    Serial.setTimeout(SERIAL_TIMEOUT);\n    logicAnalyzer.setDescription(DESCRIPTION);\n    logicAnalyzer.begin(Serial, &amp;capture, MAX_CAPTURE_SIZE, pinStart, numberOfPins);\n}\n\nvoid loop() {\n    if (Serial) logicAnalyzer.processCommand();\n}\n<\/code><\/pre>\n<h1>Logging<\/h1>\n<p>You can actvate the logging by assigning a Stream to the LogicAnalyzer object by calling logicAnalyzer.setLogger():<\/p>\n<pre><code>\/\/ setup logger\nSerial1.begin(115200, SERIAL_8N1, 16, 17);\nlogicAnalyzer.setLogger(Serial1);\n<\/code><\/pre>\n<h1>Adding Additional Functionality<\/h1>\n<p>An easy way to extend the functionality is by adding an event handler. The following acts on a status change event by activating the LED dependent on the actual status:<\/p>\n<pre><code>\/\/ Use Event handler to control the LED\nvoid onEvent(Event event) {\n    if (event == STATUS) {\n        switch (logicAnalyzer.status()) {\n            case ARMED:\n                digitalWrite(LED_BUILTIN, LOW);\n                break;\n            case STOPPED:\n                digitalWrite(LED_BUILTIN, LOW);\n                break;\n        }\n    }\n}\n<\/code><\/pre>\n<p>and we can just activate it by calling:<\/p>\n<pre><code>logicAnalyzer.setEventHandler(&amp;onEvent);\n\n<\/code><\/pre>\n<h1>Custom Capturing<\/h1>\n<p>I am providing a default implementation for the capturing with the <a href=\"https:\/\/pschatzmann.github.io\/logic-analyzer\/html\/classlogic__analyzer_1_1_capture.html\">Capture<\/a> class. It&#8217;s main goal is portability because it should work on all Arduino Boards. To come up with a dedicated improved capturing is easy. Just implement your own class:<\/p>\n<pre><code>class YourFastCapture : public AbstractCapture {\n    public:\n        \/\/\/ Default Constructor\n        YourFastCapture() : AbstractCapture(){\n        }\n\n        \/\/\/ starts the capturing of the data\n        virtual void capture(){\n            \/\/\/ your implementation\n        }\n}\n<\/code><\/pre>\n<h1>Supporting new Architectures<\/h1>\n<p>In order to support a new architecture, you need to implement a specific config file, that contains the following information:<\/p>\n<ul>\n<li>Defines for the <strong>processor specific (resource) settings<\/strong> (e.g. MAX_CAPTURE_SIZE, SERIAL_SPEED &#8230;)<\/li>\n<li>A <strong>typedef for PinBitArray<\/strong> which defines the recorded data size<\/li>\n<li>An implementation of the <strong>class PinReader<\/strong> which reads all pins in one shot<\/li>\n<\/ul>\n<p>Here is the <a href=\"https:\/\/github.com\/pschatzmann\/logic-analyzer\/blob\/main\/src\/config_esp32.h\">config_esp32.h<\/a> which serves as an example.<\/p>\n<h1>Class Documentation<\/h1>\n<p>The complete <a href=\"https:\/\/pschatzmann.github.io\/logic-analyzer\/html\/annotated.html\">generated class documentation<\/a> can be found on Github.<\/p>\n<h1>Connecting to Pulseview<\/h1>\n<ul>\n<li>Start the Arduino <strong>&#8220;logic-analyzer&#8221;<\/strong> Sketch<\/li>\n<li>Start <strong>Pulseview<\/strong><\/li>\n<li>Select &#8220;Connect to a Device&#8221;:\n<ul>\n<li>Choose the Driver: <strong>Openbench Logic Sniffer &amp; SUMP Compatibles<\/strong><\/li>\n<li>Choose the Interface: Select <strong>Serial Port<\/strong> with the Port to your Arduino Device and the frequency defined in the config<Device>.h (e.g. the ESP32 uses 921600)<\/li>\n<li>Click on <strong>&#8220;Scan for Devices using driver above&#8221;<\/strong> button<\/li>\n<li>Select the Device &#8211; <strong>&#8220;Arduino&#8221;<\/strong> which should be available and confirm with OK<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h1>Installation<\/h1>\n<p>You can download the library as zip and call include Library -> zip library. Or you can git clone this project into the Arduino libraries folder e.g. with<\/p>\n<pre><code>cd  ~\/Documents\/Arduino\/libraries\ngit clone pschatzmann\/logic-analyzer.git\n<\/code><\/pre>\n<h1>Supported Boards<\/h1>\n<p>I have tested the functionality with the following processors:<\/p>\n<table>\n<thead>\n<tr>\n<th>Processor<\/th>\n<th>Max Freq<\/th>\n<th>Max Samples<\/th>\n<th>Pins<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ESP32<\/td>\n<td>2463700<\/td>\n<td>100000<\/td>\n<td>8<\/td>\n<\/tr>\n<tr>\n<td>ESP8266<\/td>\n<td>1038680<\/td>\n<td>50000<\/td>\n<td>4<\/td>\n<\/tr>\n<tr>\n<td>AVR Processors (Nano)<\/td>\n<td>109170<\/td>\n<td>500<\/td>\n<td>8<\/td>\n<\/tr>\n<tr>\n<td>Raspberry Pico<\/td>\n<td>2203225<\/td>\n<td>100000<\/td>\n<td>8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h1>Summary<\/h1>\n<p>The basic implementation is only using a single core. While capturing is in process we do not support any cancellation triggered from Pulseview. In order to support this, we would just need to extend the functionality in a specific sketch to run the capturing on one core and the command handling on the second core. And this is exactly the purpose of this library: to be able to build a custom optimized logic analyzer implementation with minimal effort!<\/p>\n<p>You can find my project <a href=\"https:\/\/github.com\/pschatzmann\/logic-analyzer\">on Github<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Recently, when I started to research the topic of Logic Analyzers, I found the incredible PulseView Project. However, I did not want to invest in additional hardware but just use one of my favorite microprocessors (ESP32, Raspberry Pico) as capturing device. There are quite a few logic analyzer projects with [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2833,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[20,25,10],"tags":[],"class_list":["post-2832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-logicanalyzer","category-projects"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A flexible Arduino SUMP Logic Analyzer Library - Phil Schatzmann<\/title>\n<meta name=\"description\" content=\"logic analyzer arduino pico SUMP Pulseview Sigrok\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pschatzmann.ch\/home\/2021\/04\/20\/a-flexible-arduino-sump-logic-analyzer-library\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A flexible Arduino SUMP Logic Analyzer Library - 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