PMIC Q&A watchdog reset example

Table of Contents

• Introduction
• Supported Combinations
• Steps to Run the Example
• Sample Output

Introduction

The example demonstrates the PMIC watchdog in Q&A mode which will generate a warm reset when the core fails to send the answers to the watchdog. The application configures the GPIO pins and the watchdog in the PMIC to send and receive the Q&A signals. It services the watchdog for few iterations and stops sending the answers. Then, the core will wait for sometime based on the reset threshold value configured in the watchdog for the warm reset to occur. If the warm reset occurs, the test passes else fails.

Note

This example won't work in the debug mode as the user must not service the watchdog while in debug mode. Flash the application to get the expected result.

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 freertos
	r5fss0-0 nortos
Toolchain	ti-arm-clang
Boards	am263px-cc
Example folder	examples/drivers/pmic/pmic_qa_watchdog_reset

Steps to Run the Example

• When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
• When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)
• As it is a watchdog example, it cannot be loaded through CCS as it may fail in debug mode. It should be flashed and booted through SBL to get the expected results.
• Refer Flash a Hello World example for flashing the application.
• Set bootmode to UART BOOT MODE and flash the binary using the following command from {SDK_INSTALLTION_PATH}/tools/boot
• Modify the existing default_sbl_ospi.cfg with the correct path of the application image.

  python uart_uniflash.py -p COM<x> --cfg=sbl_prebuilt/am261x-lp/default_sbl_ospi.cfg

• Power OFF and change the boot mode to OSPI BOOT MODE
• Logs should appear at the UART port

Sample Output

Shown below is a sample output when the application is run,

Starting Q&A watchdog reset example !!
Checking if prerequisites for configuring the WDG has been met...
Configure PMIC watchdog in Q&A mode... DONE 
Started watchdog sequence... Sending answers to the PMIC... 
Stopped sending watchdog answers... Waiting for the warm reset to occur... 
Warm reset has occurred due to watchdog failure!! 
All tests have passed!!