power cycle needed after flash erase/program

KelvinSmith — Mon, 10 Jul 2023 20:09:57 GMT

I thought this problem was fixed, but it has come back.

We are using the s32k146 processor.

When I erase and write new data to the data flash memory, after the write, when reading from address 0x10000000, I get the old data and not the newly written data. Power cycling will fix this, but we don't want to have this limitation.

I asked this question before and got a response which led me to the OCM1 field of the OCMDR[1] register. I used this to disable and renable the cache, and tested and got good results. But I guess I was just lucky, because now I am back to having this problem.

Below is the code where we write to the flash memory, beginning and ending with the code to disable/enable the cache. Is something missing?

MSCM->OCMDR[1] |= MSCM_OCMDR_OCM1(1); //disable data flash cache

EraseFlash(0); //erases the whole "block" however much that is, but more than just 8 bytes

FTFC_FCCOB0 = 0x7; //Program phrase

FTFC_FCCOB1 = 0x80;

FTFC_FCCOB2 = 0;

FTFC_FCCOB3 = 0;

FTFC_Data0 = ((int*) &incomingConfigs)[0];

FTFC_Data1 = ((int*) &incomingConfigs)[1];

FTFC->FSTAT |= FTFC_FSTAT_CCIF_MASK; //clear CCIF by writing 1 to it

while ((FTFC->FSTAT & FTFC_FSTAT_CCIF_MASK) == 0)

{}

FTFC_FCCOB3 = 8;

FTFC_Data0 = ((int*) &incomingConfigs)[2];

FTFC_Data1 = 0xFFFFFFFF;

FTFC->FSTAT |= FTFC_FSTAT_CCIF_MASK; //clear CCIF by writing 1 to it

while ((FTFC->FSTAT & FTFC_FSTAT_CCIF_MASK) == 0)

{}

MSCM->OCMDR[1] &= MSCM_OCMDR_OCM1(2); //enable data flash cache

Re: power cycle needed after flash erase/program

davidtosenovjan — Wed, 12 Jul 2023 13:55:55 GMT

On this device apparently there is no invalidate operation for flash pre-fetch buffer.
So you would apparently need to read from different address (out of the pre-fetched line) in order to load different line and then you should read new data you programmed before.

topic power cycle needed after flash erase/program in S32K

power cycle needed after flash erase/program

Re: power cycle needed after flash erase/program