topic KL27Z FLASH_Erase() causing reset in Kinetis Microcontrollers

KL27Z FLASH_Erase() causing reset

robertpoor — Wed, 08 Mar 2017 11:34:30 GMT

Short form:

When I run my code, I'm getting system resets somewhere inside:

flash_command_sequence.6917() at fsl_flash.c:2,554 0x4388 
FLASH_Erase() at fsl_flash.c:731 0x4880

Details:

I'm running code which is closely modeled after the Flash programming example in:

boards/frdmkl27z/driver_examples/flash/pflash/pflash.c

However, when I call FLASH_Erase(), the system resets. (And since my call to FLASH_Erase() is in the initialization code, it resets repeatedly.) Unfortunately, when I single step into FLASH_Erase(), the call to FLASH_Erase() completes normally which makes it difficult to pinpoint the problem. [UPDATE: at least I thought it did. Now it seems to reset repeatedly when I try to step into callFlashRunCommand(), aka flash_command_sequence.]

The system is powered off USB and a SEGGER JLink, so I think it has sufficient power.

I notice the call flash_command_sequence() has comments about executing position-independent code in memory -- is it possible that the code isn't properly loaded into memory?

Any idea what might be causing this, and what I can do to work around it?

Re: KL27Z FLASH_Erase() causing reset

mjbcswitzerland — Wed, 08 Mar 2017 20:02:16 GMT

Make sure that you run the code from SRAM and with interrupts disabled.

Regards

Mark

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Re: KL27Z FLASH_Erase() causing reset

robertpoor — Wed, 15 Mar 2017 18:14:14 GMT

I independently discovered that interrupts were indeed the problem: I had implemented a regular timer interrupt. Turning that off during the time I was writing to flash fixed the problem.

Thanks!