Add WDT functions to RP2040 Helper (#862)

Author: brentru

cores/rp2040/RP2040Support.h

@@ -314,6 +314,14 @@ class RP2040 {
         reboot();
     }
 
+    void wdt_begin(uint32_t delay_ms) {
+        watchdog_enable(delay_ms, 1);
+    }
+
+    void wdt_reset() {
+        watchdog_update();
+    }
+
     const char *getChipID() {
         static char id[PICO_UNIQUE_BOARD_ID_SIZE_BYTES + 1] = { 0 };
         if (!id[0]) {

docs/rp2040.rst

@@ -37,6 +37,20 @@ void rp2040.reboot()
 ~~~~~~~~~~~~~~~~~~~~
 Forces a hardware reboot of the Pico.
 
+Hardware Watchdog
+_________________
+
+void rp2040.wdt_begin(uint32_t delay_ms)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Enables the hardware watchdog timer with a delay value of delay_ms
+microseconds. Note that on the RP2040, once this function has called, the
+hardware watchdog can _not_ be disabled.
+
+void rp2040.wdt_reset()
+~~~~~~~~~~~~~~~~
+Reloads the watchdog's counter with the amount of time set by wdt_begin.
+
+
 Memory Information
 ------------------