Reference: Reboot Reason IDs
This page documents identifiers for different reboot reasons.
For more information about reboot reason tracking, see one of the following pages:
- Reboot Reason Tracking (MCU Guide)
- Reboot Reason Tracking (Android Guide)
- Reboot Reason Tracking (Linux Guide)
The tables also list the enum names from the source file
reboot_reason_types.h in the MCU SDK.
Expected reboot reasons
| Name | ID (decimal) | ID (hex) | MCU SDK enum | Notes |
|---|---|---|---|---|
| Unspecified | 0 | 0x0000 | kMfltRebootReason_Unknown | |
| User Shutdown | 1 | 0x0001 | kMfltRebootReason_UserShutdown | |
| User Reset | 2 | 0x0002 | kMfltRebootReason_UserReset | |
| Firmware Update | 3 | 0x0003 | kMfltRebootReason_FirmwareUpdate | |
| Low Power | 4 | 0x0004 | kMfltRebootReason_LowPower | Software shut down due to the battery level being too low. |
| Debugger Halted | 5 | 0x0005 | kMfltRebootReason_DebuggerHalted | |
| Button Reset | 6 | 0x0006 | kMfltRebootReason_ButtonReset | |
| Power On Reset | 7 | 0x0007 | kMfltRebootReason_PowerOnReset | |
| Software Reset | 8 | 0x0008 | kMfltRebootReason_SoftwareReset | |
| Deep Sleep | 9 | 0x0009 | kMfltRebootReason_DeepSleep | The CPU went through a full reboot due to exit from lowest power state. |
| Pin Reset | 10 | 0x000A | kMfltRebootReason_PinReset | The CPU reset pin was toggled. |
| Self Test | 11 | 0x000B | kMfltRebootReason_SelfTest | The Self Test component caused a reset. |
Unexpected reboot reasons
| Name | ID (decimal) | ID (hex) | MCU SDK enum | Notes |
|---|---|---|---|---|
| Unexpected Reset | 32768 | 0x8000 | kMfltRebootReason_UnknownError | Flags an unexpected reset path, like the CPU reset without any reboot logic being invoked. |
| Assert | 32769 | 0x8001 | kMfltRebootReason_Assert | |
| Watchdog (Deprecated) | 32770 | 0x8002 | kMfltRebootReason_WatchdogDeprecated | Deprecated in favor of HardwareWatchdog and SoftwareWatchdog. This separation makes it easier to track the number of watchdogs not caught by software. |
| Brownout Reset | 32771 | 0x8003 | kMfltRebootReason_BrownOutReset | |
| Nmi | 32772 | 0x8004 | kMfltRebootReason_Nmi | A reset triggered by a non-maskable interrupt. |
| Hardware Watchdog | 32773 | 0x8005 | kMfltRebootReason_HardwareWatchdog | A reset triggered by a hardware watchdog timer. For more details about the nomenclature, see A Guide to Watchdog Timers for Embedded Systems. |
| Software Watchdog | 32774 | 0x8006 | kMfltRebootReason_SoftwareWatchdog | A reset triggered by a software watchdog timer. For more details about the nomenclature, see A Guide to Watchdog Timers for Embedded Systems. |
| Clock Failure | 32775 | 0x8007 | kMfltRebootReason_ClockFailure | A reset triggered due to the CPU losing a stable clock. This can happen, for example, if power to the clock is cut or the lock for the PLL is lost. |
| Kernel Panic | 32776 | 0x8008 | kMfltRebootReason_KernelPanic | A software reset triggered when the OS or RTOS that the end-user code runs on identifies a fatal error condition. |
| Firmware Update Error | 32777 | 0x8009 | kMfltRebootReason_FirmwareUpdateError | A reset triggered when an attempt to upgrade to a new OTA image has failed and a rollback to a previous version was initiated. |
| Out of Memory | 32778 | 0x800A | kMfltRebootReason_OutOfMemory | A software reset triggered due to a dynamic memory (heap) allocation failure. |
| Stack Overflow | 32779 | 0x800B | kMfltRebootReason_StackOverflow | A software reset triggered due to a stack overflow error. |
| Task Watchdog | 32780 | 0x800C | kMfltRebootReason_TaskWatchdog | A reset triggered by a watchdog timer configured to detect stuck tasks. For more details about the nomenclature, see A Guide to Watchdog Timers for Embedded Systems. |
ARM-specific error reboot reasons
Bus faults
| Name | ID (decimal) | ID (hex) | MCU SDK enum |
|---|---|---|---|
| Bus Fault | 37120 | 0x9100 | kMfltRebootReason_BusFault |
| Ibuserr | 37121 | 0x9101 | |
| Preciserr | 37122 | 0x9102 | |
| Impreciserr | 37123 | 0x9103 | |
| Unstkerr | 37124 | 0x9104 | |
| Stkerr | 37125 | 0x9105 | |
| Lsperr | 37126 | 0x9106 | |
| Bfarvalid | 37127 | 0x9107 |
Memory faults
| Name | ID (decimal) | ID (hex) | MCU SDK enum |
|---|---|---|---|
| Mem Fault | 37376 | 0x9200 | kMfltRebootReason_MemFault |
| Iaccviol | 37377 | 0x9201 | |
| Daccviol | 37378 | 0x9202 | |
| Munstkerr | 37379 | 0x9203 | |
| Mstkerr | 37380 | 0x9204 | |
| Mlsperr | 37381 | 0x9205 | |
| Mmarvalid | 37382 | 0x9206 |
Usage faults
| Name | ID (decimal) | ID (hex) | MCU SDK enum |
|---|---|---|---|
| Usage Fault | 37632 | 0x9300 | kMfltRebootReason_UsageFault |
| Undefinstr | 37633 | 0x9301 | |
| Invstate | 37634 | 0x9302 | |
| Invpc | 37635 | 0x9303 | |
| Nocp | 37636 | 0x9304 | |
| Unaligned | 37637 | 0x9305 | |
| Divbyzero | 37638 | 0x9306 |
Miscellaneous
| Name | ID (decimal) | ID (hex) | MCU SDK enum | Notes |
|---|---|---|---|---|
| Hard Fault | 37888 | 0x9400 | kMfltRebootReason_HardFault | |
| Lockup | 37889 | 0x9401 | kMfltRebootReason_Lockup | A reset which is triggered when the processor faults while already executing from a fault handler. |