{"id":3780,"date":"2018-03-18T17:55:54","date_gmt":"2018-03-19T00:55:54","guid":{"rendered":"https:\/\/visualgdb.com\/w\/?p=3780"},"modified":"2018-03-18T17:55:54","modified_gmt":"2018-03-19T00:55:54","slug":"debugging-embedded-projects-with-pyocd","status":"publish","type":"post","link":"https:\/\/visualgdb.com\/tutorials\/arm\/pyocd\/","title":{"rendered":"Debugging Embedded projects with PyOCD"},"content":{"rendered":"

This tutorial shows how to debug embedded projects\u00a0using the PyOCD tool and VisualGDB.\u00a0PyOCD is significantly less functional than OpenOCD<\/a>, however it is better integrated with mbed-specific boards, so we recommend using it as a fallback if OpenOCD doesn’t work with your board. Before you begin, install VisualGDB 5.3 or later.<\/p>\n

    \n
  1. Download and install Python 2.7 for Windows. Then open a command-line Python prompt and\u00a0install PyOCD by running “pip install pyocd”:\"01-get\"<\/a><\/li>\n
  2. You can quickly check that PyOCD works by connecting your board\u00a0to the USB port and running “pyocd-gdbserver -t <target name>”:
    \n    \"02-pyocd\"<\/a><\/li>\n
  3. Now we will create a project with VisualGDB. Start Visual Studio and select the VisualGDB Embedded Project Wizard:\"03-prj\"<\/a><\/li>\n
  4. Select “Create a new project with MSBuild -> Embedded Binary”:\"04-msb\"<\/a><\/li>\n
  5. As PyOCD is typically\u00a0used with mbed-based projects, we will demonstrate its use for the LPC812 mbed\/Xpresso board,<\/a>\u00a0however any other board supported by PyOCD will work as well.\u00a0 Select “use ARM mbed” and pick your board in the list:
    \n    \"05-device\"<\/a><\/li>\n
  6. On the next page proceed with the default “LEDBlink” example:\"06-sample\"<\/a><\/li>\n
  7. On the last page of the wizard switch\u00a0to “Debug Methods” instead of “USB Devices” and locate “PyOCD there”. If it is not shown, click the download button and install the PyOCD package:
    \n    \"07-methods\"<\/a><\/li>\n
  8. Once\u00a0PyOCD is selected, specify the\u00a0full path to the pyocd-gdbserver.exe executable (normally located in the <Python>\\scripts directory) and choose your target:
    \n    \"08-target\"<\/a>Note that as PyOCD support\u00a0is more basic compared to OpenOCD, so it won’t automatically\u00a0recognize\/fix driver\u00a0issues and won’t support live variables, profiling and other features that require background memory reads.<\/li>\n
  9. Press “Finish” to create the project. Build it with\u00a0Ctrl-Shift-B:\"09-build\"<\/a><\/li>\n
  10. Now you can set a breakpoint in main() and press F5 to start debugging. Your breakpoint will hit as soon as the code reaches that point:\"10-step\"<\/a><\/li>\n
  11. The PyOCD output will be displayed in the “VisualGDB\u00a0Program Output” pane, so you can use it to diagnose PyOCD issues.\"11-output\"<\/a><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    This tutorial shows how to debug embedded projects\u00a0using the PyOCD tool and VisualGDB.\u00a0PyOCD is significantly less functional than OpenOCD, however<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[114],"tags":[53,115,159],"_links":{"self":[{"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/posts\/3780"}],"collection":[{"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/comments?post=3780"}],"version-history":[{"count":1,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/posts\/3780\/revisions"}],"predecessor-version":[{"id":3792,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/posts\/3780\/revisions\/3792"}],"wp:attachment":[{"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/media?parent=3780"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/categories?post=3780"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/visualgdb.com\/w\/wp-json\/wp\/v2\/tags?post=3780"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}