RP2040: Implement reset reasons

Author: giulcioffi

targets/TARGET_RASPBERRYPI/TARGET_RP2040/reset_reason.c

@@ -0,0 +1,33 @@
+#include "reset_reason_api.h"
+#include "hardware/watchdog.h"
+
+#ifdef DEVICE_RESET_REASON
+
+#include "structs/resets.h"
+
+reset_reason_t hal_reset_reason_get(void)
+{
+    if (watchdog_caused_reboot()) {
+      return RESET_REASON_WATCHDOG;
+    } else {
+      return RESET_REASON_PIN_RESET;
+    }
+
+    return RESET_REASON_UNKNOWN;
+}
+
+
+uint32_t hal_reset_reason_get_raw(void)
+{
+    return resets_hw->reset;
+}
+
+
+void hal_reset_reason_clear(void)
+{
+    for (int i = 1; i < 25; i++) {
+      hw_clear_bits(&resets_hw->reset, i);
+    }
+}
+
+#endif // DEVICE_RESET_REASON

targets/targets.json

@@ -7977,7 +7977,8 @@
             "SPI",
             "USTICKER",
             "WATCHDOG",
-            "USBDEVICE"
+            "USBDEVICE",
+            "RESET_REASON"
         ]
     },
     "NANO_RP2040_CONNECT": {