IAR for STM8, FLASH_EraseBlock stuck in release mode

[Llai.930]

#define RAM_EXECUTION (1) configured with STM8AF52xx

Use FLASH_EraseBlock in debug mode to erase normally.

In release mode (medium or high optimization) use FLASH_EraseBlock to die.

why?

[Ozone]

Most probably because you use questionable constructs, or omit data/variable qualifiers.

If you e.g. not using "volatile" for externally referenced variables, the compiler will optimize it out.

[Llai.930]

I use STM8S_StdPeriph_Driver\src\stm8s_flash.c

IN_RAM(void FLASH_EraseBlock(uint16_t BlockNum, FLASH_MemType_TypeDef FLASH_MemType))
{
  uint32_t startaddress = 0;
  
#if defined(STM8S105) || defined(STM8S005) || defined(STM8S103) || defined(STM8S003) || \
    defined(STM8S001) || defined(STM8S903) || defined (STM8AF626x) || defined (STM8AF622x)
    uint32_t PointerAttr  *pwFlash;
#elif defined (STM8S208) || defined(STM8S207) || defined(STM8S007) || defined (STM8AF62Ax) || defined (STM8AF52Ax) 
  uint8_t PointerAttr  *pwFlash;
#endif
  
  /* Check parameters */
  assert_param(IS_MEMORY_TYPE_OK(FLASH_MemType));
  if(FLASH_MemType == FLASH_MEMTYPE_PROG)
  {
    assert_param(IS_FLASH_PROG_BLOCK_NUMBER_OK(BlockNum));
    startaddress = FLASH_PROG_START_PHYSICAL_ADDRESS;
  }
  else
  {
    assert_param(IS_FLASH_DATA_BLOCK_NUMBER_OK(BlockNum));
    startaddress = FLASH_DATA_START_PHYSICAL_ADDRESS;
  }
  
  /* Point to the first block address */
#if defined (STM8S208) || defined(STM8S207) || defined(STM8S007) || defined (STM8AF62Ax) || defined (STM8AF52Ax)
  pwFlash = (PointerAttr uint8_t *)(MemoryAddressCast)(startaddress + ((uint32_t)BlockNum * FLASH_BLOCK_SIZE));
#elif defined(STM8S105) || defined(STM8S005) || defined(STM8S103) || defined(STM8S003) || \
      defined(STM8S001) || defined (STM8S903) || defined (STM8AF626x) || defined (STM8AF622x)
    pwFlash = (PointerAttr uint32_t *)(MemoryAddressCast)(startaddress + ((uint32_t)BlockNum * FLASH_BLOCK_SIZE));
#endif	/* STM8S208, STM8S207 */
  
  /* Enable erase block mode */
  FLASH->CR2 |= FLASH_CR2_ERASE;
  FLASH->NCR2 &= (uint8_t)(~FLASH_NCR2_NERASE);
  
#if defined(STM8S105) || defined(STM8S005) || defined(STM8S103) || defined(STM8S003) ||  \
    defined(STM8S001) || defined(STM8S903) || defined (STM8AF626x) || defined (STM8AF622x)
    *pwFlash = (uint32_t)0;
#elif defined (STM8S208) || defined(STM8S207) || defined(STM8S007) || defined (STM8AF62Ax) || \
  defined (STM8AF52Ax)
    *pwFlash = (uint8_t)0;
  *(pwFlash + 1) = (uint8_t)0;
  *(pwFlash + 2) = (uint8_t)0;
  *(pwFlash + 3) = (uint8_t)0;    
#endif
}

[Ozone]

I have no experience with Flash erase/program on the STM8. Just did a project some while ago.

How about changing the optimization settings in the Debug version to medium/high, and trying to debug the issue ?

Or, instrument the Release version build (serial output or GPIO toggle) to see how far you really come.

[Llai.930]

Has anyone encountered a similar problem?