diff options
Diffstat (limited to 'bsps/arm/stm32h7/hal/stm32h7xx_hal_crc_ex.c')
| -rw-r--r-- | bsps/arm/stm32h7/hal/stm32h7xx_hal_crc_ex.c | 105 |
1 files changed, 56 insertions, 49 deletions
diff --git a/bsps/arm/stm32h7/hal/stm32h7xx_hal_crc_ex.c b/bsps/arm/stm32h7/hal/stm32h7xx_hal_crc_ex.c index 0d1c0270fb..239331f25b 100644 --- a/bsps/arm/stm32h7/hal/stm32h7xx_hal_crc_ex.c +++ b/bsps/arm/stm32h7/hal/stm32h7xx_hal_crc_ex.c @@ -6,27 +6,27 @@ * This file provides firmware functions to manage the extended * functionalities of the CRC peripheral. * + ****************************************************************************** + * @attention + * + * Copyright (c) 2017 STMicroelectronics. + * All rights reserved. + * + * This software is licensed under terms that can be found in the LICENSE file + * in the root directory of this software component. + * If no LICENSE file comes with this software, it is provided AS-IS. + * + ****************************************************************************** @verbatim ================================================================================ ##### How to use this driver ##### ================================================================================ [..] - (+) Set user-defined generating polynomial thru HAL_CRCEx_Polynomial_Set() + (+) Set user-defined generating polynomial through HAL_CRCEx_Polynomial_Set() (+) Configure Input or Output data inversion @endverbatim ****************************************************************************** - * @attention - * - * <h2><center>© Copyright (c) 2017 STMicroelectronics. - * All rights reserved.</center></h2> - * - * This software component is licensed by ST under BSD 3-Clause license, - * the "License"; You may not use this file except in compliance with the - * License. You may obtain a copy of the License at: - * opensource.org/licenses/BSD-3-Clause - * - ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ @@ -97,44 +97,53 @@ HAL_StatusTypeDef HAL_CRCEx_Polynomial_Set(CRC_HandleTypeDef *hcrc, uint32_t Pol /* Check the parameters */ assert_param(IS_CRC_POL_LENGTH(PolyLength)); - /* check polynomial definition vs polynomial size: - * polynomial length must be aligned with polynomial - * definition. HAL_ERROR is reported if Pol degree is - * larger than that indicated by PolyLength. - * Look for MSB position: msb will contain the degree of - * the second to the largest polynomial member. E.g., for - * X^7 + X^6 + X^5 + X^2 + 1, msb = 6. */ - while ((msb-- > 0U) && ((Pol & ((uint32_t)(0x1U) << (msb & 0x1FU))) == 0U)) + /* Ensure that the generating polynomial is odd */ + if ((Pol & (uint32_t)(0x1U)) == 0U) { + status = HAL_ERROR; } - - switch (PolyLength) + else { - case CRC_POLYLENGTH_7B: - if (msb >= HAL_CRC_LENGTH_7B) - { - status = HAL_ERROR; - } - break; - case CRC_POLYLENGTH_8B: - if (msb >= HAL_CRC_LENGTH_8B) - { - status = HAL_ERROR; - } - break; - case CRC_POLYLENGTH_16B: - if (msb >= HAL_CRC_LENGTH_16B) - { - status = HAL_ERROR; - } - break; - - case CRC_POLYLENGTH_32B: - /* no polynomial definition vs. polynomial length issue possible */ - break; - default: - status = HAL_ERROR; - break; + /* check polynomial definition vs polynomial size: + * polynomial length must be aligned with polynomial + * definition. HAL_ERROR is reported if Pol degree is + * larger than that indicated by PolyLength. + * Look for MSB position: msb will contain the degree of + * the second to the largest polynomial member. E.g., for + * X^7 + X^6 + X^5 + X^2 + 1, msb = 6. */ + while ((msb-- > 0U) && ((Pol & ((uint32_t)(0x1U) << (msb & 0x1FU))) == 0U)) + { + } + + switch (PolyLength) + { + + case CRC_POLYLENGTH_7B: + if (msb >= HAL_CRC_LENGTH_7B) + { + status = HAL_ERROR; + } + break; + case CRC_POLYLENGTH_8B: + if (msb >= HAL_CRC_LENGTH_8B) + { + status = HAL_ERROR; + } + break; + case CRC_POLYLENGTH_16B: + if (msb >= HAL_CRC_LENGTH_16B) + { + status = HAL_ERROR; + } + break; + + case CRC_POLYLENGTH_32B: + /* no polynomial definition vs. polynomial length issue possible */ + break; + default: + status = HAL_ERROR; + break; + } } if (status == HAL_OK) { @@ -224,5 +233,3 @@ HAL_StatusTypeDef HAL_CRCEx_Output_Data_Reverse(CRC_HandleTypeDef *hcrc, uint32_ /** * @} */ - -/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |