LPC55xx (Mass) Flash erase with IAP

janpieterderuit — Sun, 25 Jul 2021 20:58:48 GMT

Hi,

I'm using LPC5526 with SDK v2.8.0 with Eclipse IDE (2020-06) (so not MCUXpresso).

I'm trying to do a runtime mass erase of the flash.

I get the mass erase working with the FLASH_Erase API, specifying the full flash area to erase.
But (obviously) the controller is not capable of doing anything afterwards.

I would like to at least do a FLASH_VerifyErase afterwards.

So I implemented a function in RAM (see https://mcu-things.com/blog/ramfunc-gcc/), calling the IAP ROM functions directly (which I figured should work):

__attribute__((long_call, noinline, section(".ramfunc"))) void MassErase(void) { flash_config_t flInst; UINT32 flashBlockBase = 0; UINT32 flashTotalSize = 0; if (FLASH_API_TREE->flash_init(&flInst) == kStatus_FLASH_Success) { FLASH_API_TREE->flash_get_property(&flInst, kFLASH_PropertyPflashBlockBaseAddr, &flashBlockBase); FLASH_API_TREE->flash_get_property(&flInst, kFLASH_PropertyPflashTotalSize, &flashTotalSize); if (FLASH_API_TREE->flash_erase(&flInst, flashBlockBase, flashTotalSize, kFLASH_ApiEraseKey) { if (FLASH_API_TREE->flash_verify_erase(&flInst, flashBlockBase, flashTotalSize) == kStatus_FLASH_Success) { // Mass erase successfull } } } }

I verified code is running in RAM.

flash_init returns success and flash_get_property returns correct data, so ROM API calls seems to work OK.

Also flash_erase works (in the end Flash is erased), but I still get a SIGTRAP before flash_verify_erase can be executed.

Any idea what I can be doing wrong?

Re: LPC55xx (Mass) Flash erase with IAP

janpieterderuit — Sun, 25 Jul 2021 21:02:00 GMT

Ah, I just tried a 'step into' the flash_erase function with the debugger, and turned up in an interrupt routine.

Disabling all interrupts fixed the issue.
I can now verify Flash erasure (and anything else) from RAM.

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LPC55xx (Mass) Flash erase with IAP

Re: LPC55xx (Mass) Flash erase with IAP