#include "stm32fxx_STUlib.h"


/**
  * @brief  Initializes the pointers to the Flash memory required during
  *   run-time
  * @param  : None
  * @retval : None
  */
void STU_RomCrc32Init(void)
{
  pRunCrc32Chk = (uint32_t*)ROM_START;
  pRunCrc32ChkInv = ((uint32_t *)(uint32_t)(~(uint32_t)(ROM_START)));
  
  CrcHandle.Instance = CRC;

	 HAL_CRC_Init(&CrcHandle);
	
  /* Reset CRC Calculation Unit */
  __HAL_CRC_DR_RESET(&CrcHandle);
}



/**
  * @brief  Computes the crc in multiple steps and compare it with the
  *   ref value when the whole memory has been tested
  * @param  : None
  * @retval : STU_TestStatus (TEST_RUNNING, CLASS_C_DATA_FAIL,
  *   TEST_FAILURE, TEST_OK)
  */
STU_TestStatus STU_RomCrc32Run(void)
{
  STU_TestStatus result = CTRL_FLW_ERROR; /* In case of abnormal func exit*/

  /* Check Class C var integrity */
  if ((((uint32_t)pRunCrc32Chk) ^ ((uint32_t)pRunCrc32ChkInv)) == 0xFFFFFFFFuL)
  {
    if (pRunCrc32Chk < (uint32_t *)ROM_END)
    {
   /* the next lines replaces the HAL function call
      HAL_CRC_Accumulate(&CrcHandle, (uint32_t *)pRunCrc32Chk, (uint32_t)FLASH_BLOCK_WORDS);
      due to bug at IAR linker - check sum computation can't support both big & little endian  */
  
      uint32_t index;
      for(index = 0; index < (uint32_t)FLASH_BLOCK_WORDS; index++)
      {
        CRC->DR = (*(pRunCrc32Chk + index));
      }
      pRunCrc32Chk += FLASH_BLOCK_WORDS;     /* Increment pointer to next block */
      pRunCrc32ChkInv = ((uint32_t *)~((uint32_t)pRunCrc32Chk));
      result = TEST_RUNNING;
    }
    else
    {     
			if(CRC->DR == *(uint32_t *)(&REF_CRC32))
			{
				result = TEST_OK;
			}
			else
			{
				result = TEST_FAILURE;
			}
			STU_RomCrc32Init(); /* Prepare next test (or redo it if this one failed) */
    }
  }
  else  /* Class C error pRunCrc32Chk */
  {
    result = CLASS_C_DATA_FAIL;
  }
  return (result);
}
 
/******************* END OF FILE***********************************/