Software Reset

[mayursavaj]

Hi,

I am using MK22FN1M0VLL12 part no. from freescale Semiconductor.

I am unable to do software reset.

Can anyone guide me how to do software reset with example?

Thanks in advance.

[alubeiro]

Hi Erich,

My college started the project. I believe it is a processor expert project.

If it is not a SDK project this option is not available?

By the way, how can i know if it is a SDK project or  not?

What is the difference?

Thanks and regards

[BlackNight]

If it has a .pe file in the project root, it is a Processor Expert project.

Erich

[alubeiro]

Hi Erich

Then it is a processor Expert project but still dont know what is the difference with a SDK project. A SDK project can be made with processor expert too so that .pe file will be there too.

In anyways i wonder why the "Mk22FA12.h" file which is the MCU definition file, doesnt have those definitions in it and if It is a Core part of the Cortex M3/M4 implementation, i cant understand why they are not there.

Why other people with a k22 can make a soft reset that way? are there diferents "Mk22FA12.h" files which include those definitions?

I have had to add all those definitions to its "Mk22FA12.h" file and so far it seems i can make a software reset successfully.

By the way i have follow what it is said in this link How to Reset an ARM Cortex-M with Software | MCU on Eclipse so i can import more components, but after it, i cant find the KIN1 component.

Thanks for your quick responses.

Regards

[BlackNight]

Hi Alberto,

the KIN1 is from the KinetisTools component you can find in the Components Library:

You can find an overview and discussion about the different project types here:

Overview: Processor Expert | MCU on Eclipse 

I hope this helps,

Erich

[alubeiro]

Hi Erich,

Thanks for the info.

As for the "Mk22FA12.h" file, why arent "SCB_Register_Masks" definitions and "SCB - Peripheral register structure" in the file?

As i said in the previous post:

>>In anyways i wonder why the "Mk22FA12.h" file which is the MCU definition file, doesnt have those definitions in it and if It is a Core part of the Cortex M3/M4 implementation, i cant understand why they are not there.

Why other people with a k22 can make a soft reset that way? are there diferents "Mk22FA12.h" files which include those definitions?

I have had to add all those definitions to a header file and so far it seems i can make a software reset successfully.

Thanks and best regards

[BlackNight · Accepted solution]

Hi Mayur,

see https://mcuoneclipse.com/2015/07/01/how-to-reset-an-arm-cortex-m-with-software/

I hope this helps,

Erich

[alubeiro]

Hi Erich,

Sometime ago i did a software reset on a K60 with the following line of code:

SCB_AIRCR = (SCB_AIRCR_VECTKEY(0x05FA) | SCB_AIRCR_SYSRESETREQ_MASK);

Now im working with MK22FN1M0AVLL12 but can´t find those definitions in its "Mk22FA12.h" file so im getting an error when i build the project.

I have looked for them with different but similar names but i didn't find them either. I have not found its address either.

How can i do this software reset?

Thanks and best regards

[BlackNight]

Hi Alberto,

is this a SDK project? If yes, it uses different header files/declarations. I'm using the following:

void KIN1_SoftwareReset(void)
{
  /* Generic way to request a reset from software for ARM Cortex */
  /* See https://community.freescale.com/thread/99740
     To write to this register, you must write 0x5FA to the VECTKEY field, otherwise the processor ignores the write.
     SYSRESETREQ will cause a system reset asynchronously, so need to wait afterwards.
   */
#if KIN1_IS_USING_KINETIS_SDK
  SCB->AIRCR = (0x5FA<<SCB_AIRCR_VECTKEY_Pos)|SCB_AIRCR_SYSRESETREQ_Msk;
#else
  SCB_AIRCR = SCB_AIRCR_VECTKEY(0x5FA) | SCB_AIRCR_SYSRESETREQ_MASK;
#endif
  for(;;) {
    /* wait until reset */
  }
}
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So you need to use that code for the SDK?

Maybe this helps,

Erich