Kinetis Microcontrollers中的主题 Re: MGSTAT0 occasionally set on flash erase

MGSTAT0 occasionally set on flash erase

petersteinberg — Fri, 17 Jun 2016 20:01:26 GMT

I'm using a K20 (MK20DX128VLK7) processor.

Occasionally when I try to erase a block of the program flash I get an FTFL_FSTAT result with the MGSTAT0 bit set.

The block of flash still seems to have been erased properly.

It's very simple code:

FTFL_FCCOB0 = 0x09;

FTFL_FCCOB1 = (addr >> 16) & 0xff;

FTFL_FCCOB1 = (addr >> 8) & 0xff;

FTFL_FCCOB1 = (addr) & 0xff;

FTFL_FSTAT |= FTFL_FSTAT_CCIF_MASK;

while (!(FTFL_FSTAT & FTFL_FSTAT_CCIF_MASK)) ;

Any ideas on how to avoid this error or detect what is causing it?

Thanks,

Peter Steinberg

CCandido — Fri, 17 Jun 2016 21:22:06 GMT

Hi, test it,

__DI();

i = flash_erase_sector( 0x10000 );

__EI();

//--------------------------------------------------------------------

unsigned int flash_erase_sector(unsigned int destination) // Sector = 4k

{

unsigned int returnCode=0;

if(FTFL_FSTAT&0b01000000){FTFL_FSTAT&=0b01000000;}

if(FTFL_FSTAT&0b00100000){FTFL_FSTAT&=0b00100000;}

if(FTFL_FSTAT&0b00010000){FTFL_FSTAT&=0b00010000;}

FTFL_FCCOB0 = 0x09;

FTFL_FCCOB1 = (unsigned char)(destination >> 16);

FTFL_FCCOB2 = (unsigned char)((destination >> 8) & 0xFF);

FTFL_FCCOB3 = (unsigned char)(destination & 0xFF);

FTFL_FSTAT = 0x80; // launch command

if(FTFL_FSTAT&0x30){

return(0xff);

}

while(!(FTFL_FSTAT&(1<<7))){}

returnCode = FTFL_FSTAT&0b01110001;

return(returnCode);

}

//---------------------------------------------------------------------

petersteinberg — Wed, 22 Jun 2016 16:50:22 GMT

Disabling interrupts around the flash writes had no effect.

johnreid — Thu, 14 Jul 2016 17:03:09 GMT

Was looking at MGSTAT0 as well and found it referenced in an errata for KINETIS: http://cache.freescale.com/files/microcontrollers/doc/errata/KINETIS_2N03G.pdf

This could be your issue.