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WDT timeout

This example application shows how the watchdog timer resets by not feeding the watchdog on switch press.

Description

This example application shows 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 also sets up the timer to blink an LED 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.

Downloading and building the application

To clone or download this application from Github, go to the main page of this repository and then click Clone button to clone this repository or download as zip file. This content can also be downloaded using content manager by following these instructions.

Path of the application within the repository is apps/wdt/wdt_timeout/firmware .

To build the application, refer to the following table and open the project using its IDE.

Project Name Description
pic32mk_gp_db.X MPLABX project for PIC32MK GP Development Kit
pic32mk_mcj_curiosity_pro.X MPLABX project for PIC32MK MCJ Curiosity Pro Board
pic32mk_mcm_curiosity_pro.X MPLABX project for PIC32MK MCM Curiosity Pro Board
pic32mk_mca_curiosity_pro.X MPLABX project for PIC32MK MCA Curiosity Pro Board
   

Setting up the hardware

The following table shows the target hardware for the application projects.

Project Name Board
pic32mk_gp_db.X PIC32MK GP Development Kit
pic32mk_mcj_curiosity_pro.X PIC32MK MCJ Curiosity Pro Board
pic32mk_mcm_curiosity_pro.X PIC32MK MCM Curiosity Pro Board
pic32mk_mca_curiosity_pro.X PIC32MK MCA Curiosity Pro Board
   

Setting up PIC32MK GP Development Kit

  • Connect the Debug USB port (J12) on the board to the computer using a micro USB cable
  • Connect the USB to UART port (J25) on the board to the computer using a micro USB cable

Setting up PIC32MK MCJ Curiosity Pro Board

  • Connect the Debug USB port (J1) on the board to the computer using a micro USB cable

Setting up PIC32MK MCM Curiosity Pro Board

  • Connect the Debug USB port (J500) on the board to the computer using a micro USB cable
  • Connect the USB to UART port (J400) on the board to the computer using a micro USB cable

Setting up PIC32MK MCA Curiosity Pro Board

  • Connect the Debug USB port (J1) on the board to the computer using a micro USB cable

Running the Application

  1. Open the Terminal application (Ex.:Tera term) on the computer
  2. Connect to the EDBG Virtual COM port and configure the serial settings as follows:
    • Baud : 115200
    • Data : 8 Bits
    • Parity : None
    • Stop : 1 Bit
    • Flow Control : None
  3. Build and Program the application project using its IDE
  4. LED should be blinking and the console displays the following message

    output

  5. Press the switch to put the system in a deadlock
  6. LED should stop blinking and the console should print the following message

    output

  7. WDT will reset the device in four seconds and the demonstration should restart

Refer the table below for details of switch and LED:

Board Switch Name LED Name
PIC32MK GP Development Kit S1 LED1
PIC32MK MCJ Curiosity Pro Board SW200 LED2
PIC32MK MCM Curiosity Pro Board SW1 LED1
PIC32MK MCA Curiosity Pro Board SW200 LED1
     


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