Initial Release

watchdog/hello_watchdog/CMakeLists.txt

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+add_executable(hello_watchdog
+        hello_watchdog.c
+        )
+
+target_link_libraries(hello_watchdog pico_stdlib)
+
+# create map/bin/hex file etc.
+pico_add_extra_outputs(hello_watchdog)
+
+# add url via pico_set_program_url
+example_auto_set_url(hello_watchdog)

watchdog/hello_watchdog/hello_watchdog.c

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+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "hardware/watchdog.h"
+
+int main() {
+    stdio_init_all();
+
+    if (watchdog_caused_reboot()) {
+        printf("Rebooted by Watchdog!\n");
+        return 0;
+    } else {
+        printf("Clean boot\n");
+    }
+
+    // Enable the watchdog, requiring the watchdog to be updated every 100ms or the chip will reboot
+    // second arg is pause on debug which means the watchdog will pause when stepping through code
+    watchdog_enable(100, 1);
+
+    for (uint i = 0; i < 5; i++) {
+        printf("Updating watchdog %d\n", i);
+        watchdog_update();
+    }
+
+    // Wait in an infinite loop and don't update the watchdog so it reboots us
+    printf("Waiting to be rebooted by watchdog\n");
+    while(1);
+}