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 STM32F051C4Code:#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 15:22Ok 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.