How do you write data to internal P-Flash for MK22F51212?

[brendanmerna]

I need to write a value to the flash as a check bit for the bootloader. So the bootloader can determine whether to stay in bootloader to update the program or jump to the existing application.

[brendanmerna]

Here I attached the relevant flash files that I made.

-Brendan

[Hui_Ma]

Hi Brendan,

Sorry for the later reply.

Please make sure the erased sector is not in Flash protection range.

Could you provide the FTFE_FPROTn registers value for double check?

Have a great day,
Ma Hui

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[brendanmerna]

Ma Hui,

Do you mean the FTFA_FPROTn? Using the EmbSys Register tab in kinetis those registers are all 0xFF. Seems like that would mean nothing is protected.

-Brendan

[Hui_Ma]

Hi Brendan,

Please check [Erase Flash Sector Command] info with K22 reference manual:

The ACCERR with below condition, please check if the provided Flash address is no phrase aligned (flash_address[2:0] = 000).

And could you check with MCUXpresso SDK for TWR-K22F120M [flash] demo, which located with below path:

..\SDK_2.2_TWR-K22F120M\boards\twrk22f120m\driver_examples\flash\pflash\iar

If that demo also with same issue on your site? Thanks.

Have a great day,
Ma Hui

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[Hui_Ma]

Hi,

If using runtime routine to program data at Flash address, customer could refer TFS Flash Driver Software for Kinetis® and ColdFire+ Microcontrollers(REV 1.03) provided [demo_normal].
https://www.nxp.com/downloads/en/device-drivers/C90TFS_FLASH_DRIVER.exe

Customer could refer [MK21FN1M0xxx10] chip related code as an example.

Wish it helps.

Have a great day,
Ma Hui

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[brendanmerna]

Hey Ma Hui,

I implemented the driver examples in the SDK, but its causing an error return when I try to go erase the flash. The result I get back is kStatus_FLASH_AccessError. Is there another step I need to do to unlock something.

-Brendan