WDT1 Example

Source code path: example/hal/wdt/wdt1

Supported Platforms

  • sf32lb52-lcd_n16r8

  • sf32lb58-lcd_n16r64n4

Overview

This example demonstrates WDT1 usage, including:

  • WDT1 configuration and enabling.

  • WDT1 feeding.

  • WDT1 timeout response.

Example Usage

Hardware Requirements

Before running this example, prepare a development board supported by this example

Compilation and Programming

Switch to the example project directory and run the scons command to execute compilation:

scons --board=sf32lb52-lcd_n16r8 -j32

Run build_sf32lb52-lcd_n16r8_hcpu\uart_download.bat, select the port as prompted for download:

$ ./uart_download.bat

     Uart Download

please input the serial port num:5

For detailed steps on compilation and download, please refer to the relevant introduction in Getting Started Guide.

Expected Results of Example

After the example starts, the serial port outputs as follows:

  1. WDT1 initialization configuration and enabling successful:

10-28 21:27:41:364    WDT Example:
10-28 21:27:41:366    WDT init OK. Timeout: 10(s) Reload2: 60(s)
10-28 21:27:41:368    WDT_CVR0:0x50000 WDT_CVR1:0x1E0000

Tip

In this example, WDT1 working mode (respond mode) is configured as interrupt and reset, counting two rounds, with first round counting timeout of 10 seconds and second round counting timeout of 60 seconds.

  1. Feeding the dog (every 5 seconds):

10-28 21:27:46:419    Watchdog feeding.
10-28 21:27:51:332    Watchdog feeding.
10-28 21:27:56:328    Watchdog feeding.
10-28 21:28:01:339    Watchdog feeding.
10-28 21:28:06:329    Watchdog feeding.
10-28 21:28:11:360    Watchdog feeding.
10-28 21:28:16:356    Watchdog feeding.
10-28 21:28:21:368    Watchdog feeding.
10-28 21:28:26:361    Watchdog feeding.
10-28 21:28:31:373    Watchdog feeding.

  1. After stopping feeding the dog, the first round of counting ends (10s), generating an interrupt:

10-28 21:28:31:373    Watchdog feeding.
10-28 21:28:43:793    WDT timeout. Interrupt triggered.

  1. The second round of counting ends (60s), resetting the system:

10-28 21:29:58:197    SFBL
10-28 21:29:59:394    Serial:c2,Chip:4,Package:3,Rev:2  Reason:00000002

10-28 21:29:59:398    NAND ID 0x7070cd
10-28 21:29:59:402    det bbm table with 1, 1, 2

Exception Diagnosis

  1. Confirm WDT configuration status (enable status, count configuration, working mode) through WDT registers: WDT regmap

  2. After WDT is configured correctly, WDT timeout cannot reset the system:
    Need to confirm whether reboot cause is correctly configured, HAL_PMU_SetWdt() can be used to add the corresponding WDT’s reboot cause:

    /* Add reboot cause for watchdog. */
HAL_PMU_SetWdt((uint32_t)hwdt.Instance);

Reference Documents

Update History

Version

Date

Release Notes

0.0.1

10/2024

Initial version