| Table of Contents |
|---|
Introduction
The watchdog timer can be used to prevent system lockup; for example, when software becomes trapped in a deadlock.In normal operation, the user restarts the watchdog at regular intervals before the timer counts down to zero.
In cases where the timer does reach zero and the watchdog is enabled, one or a combination of the following signals is
generated: a system reset, an interrupt, or an external signal. The watchdog timeout period and the duration of any output signals are programmable.
For more information, please refer Chapter 14: Timers and clocks in Zynqmp Trmwhich includes links to the official documentation and resource utilization.
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| Driver Name | Path in Vitis | Path in GitHub |
|---|---|---|
| scuwdt | <Vitis Install Directory>/data/embedded/XilinxProcessorIPLib/drivers/scuwdt | https://github.com/Xilinx/embeddedsw/tree/master/XilinxProcessorIPLib/drivers/scuwdt |
| Info |
|---|
Note: To view the sources for a particular release, use the rel-version tag in github. For example, for the 2020.1 release, the proper version of the code is: https://github.com/Xilinx/embeddedsw/tree/master/XilinxProcessorIPLib/drivers/scuwdt |
The driver source code is organized into different folders. The table below shows the scuwdt driver source organization.
| Directory | Description |
|---|---|
| src | Driver source files |
| examples | Example applications that show how to use the driver features |
| doc | Provides the API and data structure details |
| data | Driver .tcl and .mdd file |
...
Links to Examples
Examples Path:
https://github.com/Xilinx/embeddedsw/tree/master/XilinxProcessorIPLib/drivers/scuwdt/examples
| Test Name | Example source | Description |
|---|---|---|
| Polled | xscuwdt_polled_example.c | This example tests the functioning of the Scu Private WDT driver and hardware in Timer mode using polled mode. |
| Interrupt | xscuwdt_intr_example.c | This example tests the functioning of the Scu Private WDT driver and hardware in Timer mode using interrupt mode. |
Example Application Usage
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Polled mode example
https://github.com/Xilinx/embeddedsw/blob/master/XilinxProcessorIPLib/drivers/scuwdt/examples/xscuwdt_polled_example.cThis test contains a design example using the Xilinx SCU Private Watchdog Timer driver (XScuWdt) and hardware device in watchdog mode. It
illustrates how to initialize the watchdog device and restart it periodially in polling mode to avoid the assertion of the WDRESETREQ pin.
Output
| Code Block | ||
|---|---|---|
| ||
SCU WDT Polled Mode Example Test Successfully ran SCU WDT Polled Mode Example Test |
Interrupt mode example
https://github.com/Xilinx/embeddedsw/blob/master/XilinxProcessorIPLib/drivers/scuwdt/examples/xscuwdt_intr_example.cThis file contains a design example using the Xilinx SCU Private Watchdog Timer driver (XScuWdt) and hardware in Timer mode using interrupts. It illustrates
how to use Watchdog device in the timer mode.
Output
| Code Block | ||
|---|---|---|
| ||
SCU WDT Interrupt Example Test Successfully ran SCU WDT Interrupt Example Test |
Example Design Architecture
- NA
Changelog
2021.2
- None
2021.1
2020.2
2020.1
2019.2
- None
2019.1
- None