Is there any way to restart a dead device automatically

[CJT1111]

When I used Arduino Uno R:3 before, R3 could automatically restart when there was an unexpected situation in the program, but now STM32 will only crash and get stuck there, is there any way
Can STM32 be automatically restored to the beginning of the program after jamming to restart the operation?

[fpistm]

Hi @CJT1111
you can have a look to this library:
https://github.com/stm32duino/Arduino_Core_STM32/tree/main/libraries/IWatchdog

Or redefine this to call NVIC_SystemReset();

Arduino_Core_STM32/cores/arduino/stm32/stm32_def.h

Lines 138 to 142 in 586319c

	#if !defined(Error_Handler)
	#define Error_Handler() \
	while (1) {\
	}
	#endif

Or redefine some exception handler example for a STM32G4:

Arduino_Core_STM32/system/Drivers/CMSIS/Device/ST/STM32G4xx/Source/Templates/gcc/startup_stm32g471xx.s

Lines 253 to 283 in 586319c

	/*******************************************************************************
	*
	* Provide weak aliases for each Exception handler to the Default_Handler.
	* As they are weak aliases, any function with the same name will override
	* this definition.
	*
	*******************************************************************************/
	.weak NMI_Handler
	.thumb_set NMI_Handler,Default_Handler
	.weak HardFault_Handler
	.thumb_set HardFault_Handler,Default_Handler
	.weak MemManage_Handler
	.thumb_set MemManage_Handler,Default_Handler
	.weak BusFault_Handler
	.thumb_set BusFault_Handler,Default_Handler
	.weak UsageFault_Handler
	.thumb_set UsageFault_Handler,Default_Handler
	.weak SVC_Handler
	.thumb_set SVC_Handler,Default_Handler
	.weak DebugMon_Handler
	.thumb_set DebugMon_Handler,Default_Handler
	.weak PendSV_Handler
	.thumb_set PendSV_Handler,Default_Handler

which fallback to this:

Arduino_Core_STM32/system/Drivers/CMSIS/Device/ST/STM32G4xx/Source/Templates/gcc/startup_stm32g471xx.s

Lines 108 to 120 in 586319c

	/**
	* @brief This is the code that gets called when the processor receives an
	* unexpected interrupt. This simply enters an infinite loop, preserving
	* the system state for examination by a debugger.
	*
	* @param None
	* @retval : None
	*/
	.section .text.Default_Handler,"ax",%progbits
	Default_Handler:
	Infinite_Loop:
	b Infinite_Loop
	.size Default_Handler, .-Default_Handler

[CJT1111]

Thanks, I will look at the first example and do a restart function in whil, but please do not close the problem, I will return to this post after experimenting.

[fpistm]

@CJT1111
it seems you open several discussions around the same subject: #1909 and #2140.
Please avoid this, I close also this one as it is answered. You have several way to implement a restart.