Posted on March 19, 2015 at 12:07can any one help me with this problem? I try to save value in the user configured section of flash memory and restore it after power reset through hal_stm32f4xx library. I started debugging by reading the value from the programmed address without power reset and it was right. But then I tried to check the value after power reset so I ran this code . If the value is read correct (the led connected to GPIO_10) should turn on, but this didn't happen .
__attribute__((__section__(''.user_data''))) const uint32_t userConfig[64];
uint32_t testreadvalue=0;
uint32_t testwritevalue=6;
void testreadFlash(void)
{
testreadvalue =*(uint8_t *)userConfig;
}
void testwriteFlash(void)
{
HAL_StatusTypeDef status;
status = HAL_FLASH_Unlock(); // returns
HAL
_OK
FLASH->CR |= 0x1000000;
FLASH_Erase_Sector(FLASH_SECTOR_2, VOLTAGE_RANGE_1);
__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_EOP | FLASH_FLAG_OPERR | FLASH_FLAG_WRPERR | FLASH_FLAG_PGAERR | FLASH_FLAG_PGSERR );
status = HAL_FLASH_Program(TYPEPROGRAM_HALFWORD, (uint32_t) userConfig, (uint64_t)testwritevalue);
// returns
HAL
_OK
while((*(uint8_t* )(userConfig))==0);
status = HAL_FLASH_Lock();
// returns
HAL
_OK
}
int main(void)
{
HAL_Init();
MX_GPIO_Init();
testreadFlash();
if(testreadvalue==6)
{ HAL_GPIO_WritePin(GPIOB,GPIO_PIN_10,0);} //power cycle the device //TESTING
else
{ testwriteFlash();}
SystemClock_Config();
while (1)
{}
}
and this is the part of the linker for the user configured flash
MEMORY
{
// RAM
default
FLASH1 (rx) : ORIGIN = 0x08000000, LENGTH = 32k
DATA (xrw) : ORIGIN = 0x08008000, LENGTH = 32k
FLASH (rx) : ORIGIN = 0x08010000, LENGTH = 512K-64k
//others default
}
SECTIONS
{
.user_data :
{
. = ALIGN(4);
*(.user_data)
. = ALIGN(4);
} > DATA
}
