Add saved regulator modes and battery-gated crash recovery

src/helpers/RegulatorPlatform.cpp

@@ -0,0 +1,58 @@
+#include "RegulatorPlatform.h"
+
+#if defined(ESP32)
+#include <esp_system.h>
+#include <esp_attr.h>
+#include <soc/soc_caps.h>
+#if SOC_RTC_SLOW_MEM_SUPPORTED || SOC_RTC_FAST_MEM_SUPPORTED
+#define MESH_REGULATOR_RTC 1
+static RTC_NOINIT_ATTR volatile mesh::power::RecoveryRecord regulator_record;
+#else
+static volatile mesh::power::RecoveryRecord regulator_record;
+#endif
+namespace mesh { namespace power {
+volatile RecoveryRecord& platformRecoveryRecord() { return regulator_record; }
+bool platformRecoverySupported() {
+#ifdef MESH_REGULATOR_RTC
+  return true;
+#else
+  return false;
+#endif
+}
+ResetKind platformResetKind() {
+  switch (esp_reset_reason()) {
+    case ESP_RST_PANIC:
+    case ESP_RST_INT_WDT:
+    case ESP_RST_TASK_WDT:
+    case ESP_RST_WDT: return ResetKind::Crash;
+    case ESP_RST_DEEPSLEEP: return ResetKind::Wake;
+    case ESP_RST_SW: return ResetKind::Intentional;
+    case ESP_RST_POWERON:
+    case ESP_RST_EXT: return ResetKind::Cold;
+    // A supply failure is not evidence that the DC/DC regulator is faulty.
+    default: return ResetKind::Unknown;
+  }
+}
+}}
+#elif defined(RP2040_PLATFORM)
+#include <hardware/watchdog.h>
+// Arduino-Pico's linker explicitly keeps this outside BSS and above the
+// boot-ROM's scratch area. No watchdog scratch registers are commandeered.
+static volatile mesh::power::RecoveryRecord regulator_record
+    __attribute__((section(".uninitialized_data.regulator_recovery"), used));
+namespace mesh { namespace power {
+volatile RecoveryRecord& platformRecoveryRecord() { return regulator_record; }
+bool platformRecoverySupported() { return true; }
+ResetKind platformResetKind() {
+  if (watchdog_enable_caused_reboot()) return ResetKind::Crash;
+  return watchdog_caused_reboot() ? ResetKind::Intentional : ResetKind::Cold;
+}
+}}
+#elif !defined(NRF52_PLATFORM)
+namespace mesh { namespace power {
+static volatile RecoveryRecord regulator_record;
+volatile RecoveryRecord& platformRecoveryRecord() { return regulator_record; }
+bool platformRecoverySupported() { return false; }
+ResetKind platformResetKind() { return ResetKind::Unknown; }
+}}
+#endif