update

USDK/example_sources/watchdog/readme.txt

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+Example Description
+
+This example describes how to use watchdog api.
+
+Requirement Components: None
+
+In this example, watchdog is setup to 5s timeout.
+Watchdog won't bark if we refresh it before timeout.
+The timer is also reloaded after refresh.
+Otherwise it will restart system in default or call callback function if registered.

USDK/example_sources/watchdog/src/main.c

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+/*
+ *  Routines to access hardware
+ *
+ *  Copyright (c) 2015 Realtek Semiconductor Corp.
+ *
+ *  This module is a confidential and proprietary property of RealTek and
+ *  possession or use of this module requires written permission of RealTek.
+ */
+
+#include "device.h"
+#include "diag.h"
+#include "main.h"
+
+#include "wdt_api.h"
+
+#define RUN_CALLBACK_IF_WATCHDOG_BARKS (0)
+
+void dummy_task() {
+    for (int i=0; i<50000000; i++)
+        asm(" nop");
+}
+
+void small_task() {
+    printf("\r\ndoing small task...\r\n");
+    dummy_task();
+    printf("refresh watchdog\r\n\r\n");
+    watchdog_refresh();
+}
+
+void big_task() {
+    printf("\r\ndoing big task...\r\n");
+    for (int i=0; i<10; i++) {
+        DiagPrintf("doing dummy task %d\r\n", i);
+        dummy_task();
+    }
+    printf("refresh watchdog\r\n\r\n");
+    watchdog_refresh();
+}
+
+void my_watchdog_irq_handler(uint32_t id) {
+    printf("watchdog barks!\r\n");
+    watchdog_stop();
+}
+
+void main(void) {
+
+    watchdog_init(5000); // setup 5s watchdog
+
+#if RUN_CALLBACK_IF_WATCHDOG_BARKS
+    watchdog_irq_init(my_watchdog_irq_handler, 0);
+#else
+    // system would restart when watchdog barks
+#endif
+
+    watchdog_start();
+
+    small_task();
+    big_task();
+
+    while(1);
+}