topic Re: run code on ram fault in Kinetis Microcontrollers

run code on ram fault

jason_shang — Fri, 16 Mar 2018 10:47:59 GMT

I run code on RAM, it crashes into hardfault interrupt. I using SKEAZ1284

the first picture is code on flash. the second picture is the code run on RAM, but when it executes at 0x20000078 hardfault interrupt occurs. it just normal instruct read theMCR->PLACR register address into R1

Re: run code on ram fault

kerryzhou — Mon, 19 Mar 2018 08:51:08 GMT

Hi Shang jason,

Could you tell me what the IDE you are using, do you just put the FLASH_LaunchCMD to RAM or the whole project to RAM.

Take IAR project as an example, you can use this code:

#if (defined(IAR))
__ramfunc void FLASH_LaunchCMD(uint8_t bWaitComplete)
#else
void FLASH_LaunchCMD(uint8_t bWaitComplete)
#endif
{
#if     defined(FLASH_ENABLE_STALLING_FLASH_CONTROLLER)
     MCM->PLACR |= MCM_PLACR_ESFC_MASK;          /* enable stalling flash controller when flash is busy */
#endif
    FTMRH->FSTAT = 0x80;
    if(bWaitComplete)
    {
      // Wait till command is completed
      while (!(FTMRH->FSTAT & FTMRH_FSTAT_CCIF_MASK));
    }
}

Please also don't do the project optimization, then test it again.

Any updated information, please kindly let me know!

Have a great day,
Kerry

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Re: run code on ram fault

jason_shang — Tue, 20 Mar 2018 14:52:46 GMT

thanks for your suggestion, I am using keil, first I place FLASH_LaunchCMD on code section, compile the code.then copy the code data into a data array, use a function pointer jump to data array execute FLASH_LaunchCMD.

Re: run code on ram fault

kerryzhou — Wed, 21 Mar 2018 08:07:44 GMT

Hi qingrong,

Thank you for your updated information.

When do the flash operation, especially launch the command in the RAM, customer need to disable the global interrupt at first, after the command is finished, you can enable the interrupt again.

Do you disable the interrupt?

__disable_irq();

Launch flash command;

__enable_irq();

Wish it helps you!

Have a great day,
Kerry