3.9.4.1.17 Example of WDT Timeout on PIC32CM LS00 Curiosity Nano+ Touch Evaluation Kit

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Description

This example application demonstrates how the WDT peripheral library resets the watchdog timer by not feeding the watchdog on switch press. The application sets up the watchdog to reset the device. The application sets up the timer to blink an LED1 to emulate a process. A user switch press forces the device to wait in an infinite loop to emulate a deadlock. As a result a device reset is triggered as the watchdog counter overflows the bounded value.

Modules/Technology Used

  • Peripheral Modules
    • EVSYS
    • NVMCTRL
    • PM
    • EIC
    • PORT
    • SERCOM (UART)
    • SYSTICK
    • WDT
    The following figure provides the MCC Harmony project graph with all the components.

Hardware Used

Software/Tools Used

This project has been verified to work with the following versions of software tools:

Refer to the Project Manifest present in harmony-manifest-success.yml under the project folder firmware\wdt\src\config\pic32cm_ls00_cnano.

  • Refer to the Release Notes to know the MPLAB X IDE and MCC Plug-in version
  • Any Serial Terminal application, such as Tera Term/PuTTY terminal application

Due to Microchip regularly updates tools, occasionally issue(s) could be discovered while using the newer versions of the tools. If the project does not seem to work and version incompatibility is suspected, it is recommended to double-check and use the same versions that the project was tested with. To download original version of MPLAB Harmony v3 packages, refer to the document How to Use the MPLAB Harmony v3 Project Manifest Feature (DS90003305).

Setup

  • Connect the PIC32CM LS00 Curiosity Nano+ Touch evaluation kit to the host PC as a USB device through a Type-A male to micro-B USB cable connected to Micro-B USB (Debug USB) port

Programming Hex File

The pre-built hex file can be programmed by following the below steps.

Steps to program the hex file
  • Open MPLAB X IDE
  • Close all existing projects in IDE, if any project is opened
  • Go to File>Import>Hex/ELF File
  • In the Import Image File window,
    1. Create Prebuilt Project,
      • Click the Browse button to select the prebuilt hex file
      • Select Device as PIC32CM5164LS00048
      • Ensure the proper tool is selected under Hardware Tool and click the Next button
    2. Select Project Name and Folder,
      • Select appropriate project name and folder and click the Finish button
  • In MPLAB X IDE, click the Make and Program Device button to program the device.
  • Follow the steps in Running the Demo section

Programming/Debugging Application Project

  • Open the project (wdt_timeout\firmware\wdt\pic32cm_ls00_cnanogroup) in MPLAB X IDE
  • Ensure PIC32CM LS00 Curiosity Nano is selected as hardware tool to program/debug the application
  • Build the code and program the device by clicking on the Make and Program button in MPLAB X IDE tool bar
  • Follow the steps in Running the Demo section

Running the Demo

  • Open the Tera Term/PuTTY terminal application on the PC (from the Windows® Start menu by pressing the Start button)
  • Set the baud rate to 115200
  • An LED1 on the PIC32CM LS00 Curiosity Nano+ Touch evaluation kit is toggles continuously using the SysTick Timer
  • The LED1 should be blinking and the console displays the following message
  • Press the switch SW1 on the PIC32CM LS00 Curiosity Nano+ Touch evaluation kit to put the system in deadlock
  • LED1 should stop blinking and the console displays the following message
  • WDT will reset the device in four seconds and the demonstration should restart

Tera Term Output

  • The following output is displayed in serial terminal

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