This example application shows how to generate a Watchdog timer reset by emulating a
deadlock.
Parent topic:Harmony 3 Peripheral Library Application Examples for SAMA5D2 Family
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.
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 |
---|---|
sam_a5d2_curiosity.X | MPLABX project for SAMA5D29 Curiosity Development Board Kit |
To load the application binary onto the target device, we need to use at91bootstrap
loader. Refer to the at91bootstrap loader documentation for
details on how to configure, build and run bootstrap loader project and use it to
bootstrap the application binaries.
The following table shows the target hardware for the application projects.
Project Name | Description |
---|---|
sam_a5d2_curiosity.X | SAMA5D29 Curiosity Development Board Kit |
ADDITIONAL HARDWARE REQUIRED
SETTING UP THE SD CARD
SETTING UP THE BOARD
Build the application using its IDE
Copy the output binary (named ‘harmony.bin’) onto the SD Card (Refer to the ‘Setting up hardware’ section above for setting up the SD card)
Insert the SD card into SDMMC slot on the board (Refer to the ‘Setting up hardware’ section for the correct SDMMC slot)
Open the Terminal application (Ex.:Tera term) on the computer.
Connect to the Virtual COM port and configure the serial settings as follows:
Reset the board to run the application
LED should be blinking and the console displays the following message
Press the switch to put the system in a deadlock
LED should stop blinking and the console should print the following message
WDT will reset the device in four seconds and the demonstration should restart
Following table provides details of Switch and LED names:
Board | Switch Name | LED Name |
---|---|---|
SAMA5D29 Curiosity Development Board | USER | RGB_LED (Blue) |
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