IWDT Example

Source code path: example/hal/wdt/iwdt

Supported Platforms

sf32lb52-lcd_n16r8

Overview

This example demonstrates IWDT usage, including:

IWDT configuration and enabling.
IWDT feeding.
IWDT timeout response.

Example Usage

Hardware Requirements

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

menuconfig Configuration

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 [](/quickstart/get-started.md).

## Expected Results of Example
<!-- Explain example running results, such as which LEDs will light up, which logs will be printed, to help users judge whether the example is running normally, running results can be explained step by step combined with code -->
After the example starts, the serial port outputs as follows:
1. IWDT initialization configuration and enabling successful:
```c
10-28 23:44:00:340    WDT Example:
10-28 23:44:00:342    IWDT init OK. Timeout: 10(s)
10-28 23:44:00:343    WDT_CVR0:0x50000 WDT_CVR1:0x0

Tip

IWDT cannot generate interrupts. Here the working mode (respond mode) is configured as reset only, counting only one round, with timeout set to 10 seconds.

Feeding the dog (every 5 seconds):

10-28 23:44:05:270    Watchdog feeding.
10-28 23:44:10:298    Watchdog feeding.
10-28 23:44:15:262    Watchdog feeding.
10-28 23:44:20:291    Watchdog feeding.
10-28 23:44:25:280    Watchdog feeding.
10-28 23:44:31:132    Watchdog feeding.
10-28 23:44:35:300    Watchdog feeding.
10-28 23:44:40:301    Watchdog feeding.
10-28 23:44:45:304    Watchdog feeding.
10-28 23:44:50:320    Watchdog feeding.

After stopping feeding the dog, the first round of counting ends (10s), directly resetting the system:

10-28 23:44:50:320    Watchdog feeding.
10-28 23:45:03:215    SFBL
10-28 23:45:04:945    Serial:c2,Chip:4,Package:3,Rev:2  Reason:00000020

10-28 23:45:04:950    NAND ID 0x7070cd
10-28 23:45:04:957    det bbm table with 1, 1, 2

Exception Diagnosis

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