하드웨어로 구현된거라 소프트웨어로 루프돌리는것 보다 빠르다는게 장점인데 대충(?) 60배 빠르다고 한다.
hcrc 라는 핸들이 선언되어 있고
HAL_CRC_Calcuate() 함수를 이용해서 바로 리턴을 받는 구조인 듯.
| /* Private variables ---------------------------------------------------------*/ CRC_HandleTypeDef hcrc; uint32_t HAL_CRC_Calculate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength) { uint32_t index; /* CRC input data buffer index */ uint32_t temp = 0U; /* CRC output (read from hcrc->Instance->DR register) */ /* Change CRC peripheral state */ hcrc->State = HAL_CRC_STATE_BUSY; /* Reset CRC Calculation Unit (hcrc->Instance->INIT is * written in hcrc->Instance->DR) */ __HAL_CRC_DR_RESET(hcrc); /* Enter 32-bit input data to the CRC calculator */ for (index = 0U; index < BufferLength; index++) { hcrc->Instance->DR = pBuffer[index]; } temp = hcrc->Instance->DR; /* Change CRC peripheral state */ hcrc->State = HAL_CRC_STATE_READY; /* Return the CRC computed value */ return temp; } |
[링크 : https://cpattern.tistory.com/218]
[링크 : https://m.blog.naver.com/sheld2/222346016827] crc32 와 동일하게 나오게 하려면 수정 필요
[링크 : https://blog.naver.com/eziya76/221507312819]
| CRC calculation unit, 96-bit unique ID 2.3.3 CRC (cyclic redundancy check) calculation unit The CRC (cyclic redundancy check) calculation unit is used to get a CRC code from a 32-bit data word and a fixed generator polynomial. Among other applications, CRC-based techniques are used to verify data transmission or storage integrity. In the scope of the EN/IEC 60335-1 standard, they offer a means of verifying the Flash memory integrity. The CRC calculation unit helps compute a signature of the software during runtime, to be compared with a reference signature generated at linktime and stored at a given memory location. |
[링크 : https://www.st.com/resource/en/datasheet/stm32f103rc.pdf]
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