Is FTFA_FSTAT->CCIF reliable as Flash available flag ?

zixunli — Tue, 26 Feb 2019 14:29:07 GMT

Hi,

I'm using KM34Z256 with IAP support. Currently interrupts are disabled during IAP flash write/erase to ensure there is no collision error (IAP code itself is executed in RAM).

However I'd like to have some interrupts available during Flash read/write (for example USART and DMA), my approach is :

1.Copy vector table to RAM and modify SCB->VTOR

2.Define all interrupt handlers as ramfunc

3.Check CCIF in interrupt handler before access to flash resident functions.

__ramfunc void SysTick_Handler(void)
{
msTicks++; /* increment counter necessary in Delay()*/
if(FTFA->FSTAT & FTFA_FSTAT_CCIF_MASK)
{
/* Flash resident function */
DoEvents();
}
}

I want to know if CCIF flag is a reliable indicator of Flash available ?

Thanks,

Re: Is FTFA_FSTAT->CCIF reliable as Flash available flag ?

Alexis_A — Thu, 28 Feb 2019 16:27:09 GMT

Dear Zixun Li,

Here's the description of the reference manual about this flag:

While a flash command is executing, the flag will stay low. So you can use it to check if there isn't a flash operation executing.

Best Regards,

Alexis Andalon

topic Is FTFA_FSTAT->CCIF reliable as Flash available flag ? in Kinetis Microcontrollers

Is FTFA_FSTAT->CCIF reliable as Flash available flag ?

Re: Is FTFA_FSTAT->CCIF reliable as Flash available flag ?