1 /**
2 ******************************************************************************
3 * @file stm32f2xx_crc.c
4 * @author MCD Application Team
5 * @version V1.1.2
6 * @date 05-March-2012
7 * @brief This file provides all the CRC firmware functions.
8 ******************************************************************************
9 * @attention
10 *
11 * <h2><center>© COPYRIGHT 2012 STMicroelectronics</center></h2>
12 *
13 * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
14 * You may not use this file except in compliance with the License.
15 * You may obtain a copy of the License at:
16 *
17 * http://www.st.com/software_license_agreement_liberty_v2
18 *
19 * Unless required by applicable law or agreed to in writing, software
20 * distributed under the License is distributed on an "AS IS" BASIS,
21 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
22 * See the License for the specific language governing permissions and
23 * limitations under the License.
24 *
25 ******************************************************************************
26 */
27
28 /* Includes ------------------------------------------------------------------*/
29 #include "stm32f2xx_crc.h"
30
31 /** @addtogroup STM32F2xx_StdPeriph_Driver
32 * @{
33 */
34
35 /** @defgroup CRC
36 * @brief CRC driver modules
37 * @{
38 */
39
40 /* Private typedef -----------------------------------------------------------*/
41 /* Private define ------------------------------------------------------------*/
42 /* Private macro -------------------------------------------------------------*/
43 /* Private variables ---------------------------------------------------------*/
44 /* Private function prototypes -----------------------------------------------*/
45 /* Private functions ---------------------------------------------------------*/
46
47 /** @defgroup CRC_Private_Functions
48 * @{
49 */
50
51 /**
52 * @brief Resets the CRC Data register (DR).
53 * @param None
54 * @retval None
55 */
CRC_ResetDR(void)56 void CRC_ResetDR(void)
57 {
58 /* Reset CRC generator */
59 CRC->CR = CRC_CR_RESET;
60 }
61
62 /**
63 * @brief Computes the 32-bit CRC of a given data word(32-bit).
64 * @param Data: data word(32-bit) to compute its CRC
65 * @retval 32-bit CRC
66 */
CRC_CalcCRC(uint32_t Data)67 uint32_t CRC_CalcCRC(uint32_t Data)
68 {
69 CRC->DR = Data;
70
71 return (CRC->DR);
72 }
73
74 /**
75 * @brief Computes the 32-bit CRC of a given buffer of data word(32-bit).
76 * @param pBuffer: pointer to the buffer containing the data to be computed
77 * @param BufferLength: length of the buffer to be computed
78 * @retval 32-bit CRC
79 */
CRC_CalcBlockCRC(uint32_t pBuffer[],uint32_t BufferLength)80 uint32_t CRC_CalcBlockCRC(uint32_t pBuffer[], uint32_t BufferLength)
81 {
82 uint32_t index = 0;
83
84 for(index = 0; index < BufferLength; index++)
85 {
86 CRC->DR = pBuffer[index];
87 }
88 return (CRC->DR);
89 }
90
91 /**
92 * @brief Returns the current CRC value.
93 * @param None
94 * @retval 32-bit CRC
95 */
CRC_GetCRC(void)96 uint32_t CRC_GetCRC(void)
97 {
98 return (CRC->DR);
99 }
100
101 /**
102 * @brief Stores a 8-bit data in the Independent Data(ID) register.
103 * @param IDValue: 8-bit value to be stored in the ID register
104 * @retval None
105 */
CRC_SetIDRegister(uint8_t IDValue)106 void CRC_SetIDRegister(uint8_t IDValue)
107 {
108 CRC->IDR = IDValue;
109 }
110
111 /**
112 * @brief Returns the 8-bit data stored in the Independent Data(ID) register
113 * @param None
114 * @retval 8-bit value of the ID register
115 */
CRC_GetIDRegister(void)116 uint8_t CRC_GetIDRegister(void)
117 {
118 return (CRC->IDR);
119 }
120
121 /**
122 * @}
123 */
124
125 /**
126 * @}
127 */
128
129 /**
130 * @}
131 */
132
133 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
134