Flash memory write -> HardFault_Handler

[fidel17]

Posted on April 12, 2014 at 17:43

Hi everyone,

I have problem with writing to flash memory in my application. uC STM32F051C4

Code:

#define FLASH1 (*((uint32_t *)0x08001016))

then flash function:

void FLASHunlock(void)

{

if (FLASH->CR &0x00000080)

{

FLASH->KEYR = 0x45670123;

FLASH->KEYR = 0xCDEF89AB;

}

}

void FLASHwrite(void)

{

uint16_t z=0xF0F0;

FLASHunlock();

while(FLASH->SR & 0x00000001);

FLASH->CR = 0x00000001;

FLASH1 = z;              -> here program jumps to HardFault_Handler

while (FLASH->SR & 0x00000001);

}

Any ideas? Flash is eriassed (everywhere FF FF)

[Tesla DeLorean]

Posted on April 13, 2014 at 02:23

Use a WORD aligned address

[fidel17]

Posted on April 13, 2014 at 10:45

How? :)

[Tesla DeLorean]

Posted on April 13, 2014 at 11:19

How? :)

Use an address which is divisible by FOUR

#define FLASH1 (*((uint32_t *)0x08001018))

I have other issues with your code, but that's why it's faulting.

[fidel17]

Posted on April 13, 2014 at 11:58

I still get HardFault_Handler with 0x08001018, 

I was checking elier with 08004000, 08002000 - same story. 

Please share other issues :)

Experiment:

When i change adress to 0x48000014 witch is GPIOA ODR, everything works.

Data is stored on LSB bits of GPIOA, register value is 0x0000F0F0 

[fidel17]

Posted on April 13, 2014 at 15:22

Ok i got it working with ST library.

I am still very curious what have i done wrong. 

[Tesla DeLorean]

Posted on April 13, 2014 at 20:09

The ST library code sets/clears the PG bit without disturbing the other bits, looks at the SR slightly differently, and has some additional latency based on the subroutine calls.