initial commit

libraries/Adafruit_SleepyDog_Library/utility/WatchdogNRF.cpp

@@ -0,0 +1,61 @@
+#ifdef NRF52_SERIES
+
+#include "WatchdogNRF.h"
+#include "Arduino.h"
+#include "nrf_wdt.h"
+
+WatchdogNRF::WatchdogNRF() { _wdto = -1; }
+
+int WatchdogNRF::enable(int maxPeriodMS) {
+  if (maxPeriodMS < 0)
+    return 0;
+
+  // cannot change wdt config register once it is started
+  // return previous configured timeout
+  if (nrf_wdt_started(NRF_WDT))
+    return _wdto;
+
+  // WDT run when CPU is sleep
+  nrf_wdt_behaviour_set(NRF_WDT, NRF_WDT_BEHAVIOUR_RUN_SLEEP);
+  uint32_t wdt_val = ((uint64_t)maxPeriodMS * 32768) / 1000;
+  nrf_wdt_reload_value_set(NRF_WDT, wdt_val);
+
+  // use channel 0
+  nrf_wdt_reload_request_enable(NRF_WDT, NRF_WDT_RR0);
+
+  // Start WDT
+  // After started CRV, RREN and CONFIG is blocked
+  // There is no way to stop/disable watchdog using source code
+  // It can only be reset by WDT timeout, Pin reset, Power reset
+  nrf_wdt_task_trigger(NRF_WDT, NRF_WDT_TASK_START);
+
+  _wdto = maxPeriodMS;
+
+  return maxPeriodMS;
+}
+
+void WatchdogNRF::reset() { nrf_wdt_reload_request_set(NRF_WDT, NRF_WDT_RR0); }
+
+// There is no way to stop/disable watchdog using source code
+void WatchdogNRF::disable() {}
+
+int WatchdogNRF::sleep(int maxPeriodMS) {
+  if (maxPeriodMS < 0)
+    return 0;
+
+#ifdef ARDUINO_NRF52_ADAFRUIT
+  // Mimic AVR to use 8 seconds.
+  if (maxPeriodMS == 0)
+    maxPeriodMS = 8000;
+
+  // Bluefruit freeRTOS tickless implementation will
+  // automatically put CPU into low power mode with delay()
+  delay(maxPeriodMS);
+
+  return maxPeriodMS;
+#else
+  return 0;
+#endif
+}
+
+#endif