ERR_VALUE writing using IntFlash on MK22FN512

[hypernerd]

I'm trying to use the Processor Expert IntFlash component to use a part of the program memory of the MK22FN512 as non-volatile storage.

Whenever I call any of the SetByteFlash, SetBlockFlash etc. I get the return value 3 (ERR_VALUE). Stepping through the code sees that this is caused by an Access error.

I understand that the Flash memory on the MK22F512 is in 2KB blocks, so I allocated a ROM/RAM Area in the CPU Component's Build Options at 0x7FC00, with size 0x400 and qualifier RWX. I also reduced the size of the m_text area by 0x400 from 0x7FBF0 to 0x7FBC0. I pass the address 0x7FC00 as the dest in the call to SetByteFlash or SetBlockFlash.

The corresponding calls to GetByteFlash and GetBlockFlash return with no error (ERR_OK) and it appears that the data read out is valid (all 0xFF as I can't write anything there).

I would appreciate any assistance.

Thanks,

Jamie

[marek_neuzil]

Hello Jamie,

The issue can be also caused by protection settings of your flash memory. You can find these settings in the Component Inspector of the CPU component, Common Settings / Flash configuration field / Protection regions property group. See also the following screenshot:

Best Regards,

Marek Neuzil

[priya_dwivedula · Accepted solution]

I had a similar issue when I was using MK22F512 but I was using SSD flash driver with KSDK1.2.0. I found that the problem was that the microcontroller was running in high speed run mode by default (HSRUN) and after some research, I figured out that I cannot write to flash in that mode.

Check out the following link to learn more about HSRUN mode:

http://cache.freescale.com/files/microcontrollers/doc/app_note/AN4985.pdf

After I changed the clock to run in normal run mode, I was able to write to flash.

[hypernerd]

Thanks, this solved it. I had the Core clock at 120MHz, which forces HSRUN mode.

I created a second clock configuration with the Core clock at 80MHz (the limit before HSRUN is forced) and switch to that just before writing to Flash. I also had to set the IntFlash to be enabled in Low Speed mode.