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.

Setting up the hardware

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

Setting up Curiosity PIC32MX470 Development Board

• To run the demo, the following additional hardware are required:
  • USB UART click board
• Connect mini USB cable to the ‘Debug USB’ connector(J3) on the board to the computer
• Install an USB UART click board on to the mikroBUS socket J5
• Connect mini USB cable between PC and the USB UART click board
  • Note: Ensure that the series resistors on the mikroBUS headers are of value 0 Ohms

Setting up PIC32MX Starter Kit

• Connect mini USB cable to the ‘Debug USB’ connector(J1) on the board to the computer

Running the Application

1. Open the Terminal application (Ex.:Tera term) on the computer
2. Connect to the “USB to UART” 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

   

5. Press the switch to put the system in a deadlock

6. LED should stop blinking and the console should print the following message

   

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

Refer the table below for details of switch and LED:

Note: For PIC32MX Starter Kit, console output is not applicable

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