1 /*!
2 \file gd32a50x_crc.c
3 \brief CRC driver
4
5 \version 2022-01-30, V1.0.0, firmware for GD32A50x
6 */
7
8 /*
9 Copyright (c) 2022, GigaDevice Semiconductor Inc.
10
11 Redistribution and use in source and binary forms, with or without modification,
12 are permitted provided that the following conditions are met:
13
14 1. Redistributions of source code must retain the above copyright notice, this
15 list of conditions and the following disclaimer.
16 2. Redistributions in binary form must reproduce the above copyright notice,
17 this list of conditions and the following disclaimer in the documentation
18 and/or other materials provided with the distribution.
19 3. Neither the name of the copyright holder nor the names of its contributors
20 may be used to endorse or promote products derived from this software without
21 specific prior written permission.
22
23 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
24 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
25 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
30 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
32 OF SUCH DAMAGE.
33 */
34
35 #include "gd32a50x_crc.h"
36
37 /*!
38 \brief deinit CRC calculation unit
39 \param[in] none
40 \param[out] none
41 \retval none
42 */
crc_deinit(void)43 void crc_deinit(void)
44 {
45 CRC_IDATA = (uint32_t)0xFFFFFFFFU;
46 CRC_DATA = (uint32_t)0xFFFFFFFFU;
47 CRC_FDATA = (uint32_t)0x00000000U;
48 CRC_POLY = (uint32_t)0x04C11DB7U;
49 CRC_CTL = CRC_CTL_RST;
50 }
51
52 /*!
53 \brief enable the reverse operation of output data
54 \param[in] none
55 \param[out] none
56 \retval none
57 */
crc_reverse_output_data_enable(void)58 void crc_reverse_output_data_enable(void)
59 {
60 CRC_CTL &= (uint32_t)(~CRC_CTL_REV_O);
61 CRC_CTL |= (uint32_t)CRC_CTL_REV_O;
62 }
63
64 /*!
65 \brief disable the reverse operation of output data
66 \param[in] none
67 \param[out] none
68 \retval none
69 */
crc_reverse_output_data_disable(void)70 void crc_reverse_output_data_disable(void)
71 {
72 CRC_CTL &= (uint32_t)(~CRC_CTL_REV_O);
73 }
74
75 /*!
76 \brief reset data register to the value of initialization data register
77 \param[in] none
78 \param[out] none
79 \retval none
80 */
crc_data_register_reset(void)81 void crc_data_register_reset(void)
82 {
83 CRC_CTL |= (uint32_t)CRC_CTL_RST;
84 }
85
86 /*!
87 \brief read the data register
88 \param[in] none
89 \param[out] none
90 \retval 32-bit value of the data register
91 */
crc_data_register_read(void)92 uint32_t crc_data_register_read(void)
93 {
94 uint32_t data;
95 data = CRC_DATA;
96 return (data);
97 }
98
99 /*!
100 \brief read the free data register
101 \param[in] none
102 \param[out] none
103 \retval 8-bit value of the free data register
104 */
crc_free_data_register_read(void)105 uint8_t crc_free_data_register_read(void)
106 {
107 uint8_t fdata;
108 fdata = (uint8_t)CRC_FDATA;
109 return (fdata);
110 }
111
112 /*!
113 \brief write the free data register
114 \param[in] free_data: specify 8-bit data
115 \param[out] none
116 \retval none
117 */
crc_free_data_register_write(uint8_t free_data)118 void crc_free_data_register_write(uint8_t free_data)
119 {
120 CRC_FDATA = (uint32_t)free_data;
121 }
122
123 /*!
124 \brief write the initialization data register
125 \param[in] init_data:specify 32-bit data
126 \param[out] none
127 \retval none
128 */
crc_init_data_register_write(uint32_t init_data)129 void crc_init_data_register_write(uint32_t init_data)
130 {
131 CRC_IDATA = (uint32_t)init_data;
132 }
133
134 /*!
135 \brief configure the CRC input data function
136 \param[in] data_reverse: specify input data reverse function
137 only one parameter can be selected which is shown as below:
138 \arg CRC_INPUT_DATA_NOT: input data is not reversed
139 \arg CRC_INPUT_DATA_BYTE: input data is reversed on 8 bits
140 \arg CRC_INPUT_DATA_HALFWORD: input data is reversed on 16 bits
141 \arg CRC_INPUT_DATA_WORD: input data is reversed on 32 bits
142 \param[out] none
143 \retval none
144 */
crc_input_data_reverse_config(uint32_t data_reverse)145 void crc_input_data_reverse_config(uint32_t data_reverse)
146 {
147 CRC_CTL &= (uint32_t)(~CRC_CTL_REV_I);
148 CRC_CTL |= (uint32_t)data_reverse;
149 }
150
151 /*!
152 \brief configure the CRC size of polynomial function
153 \param[in] poly_size: size of polynomial
154 only one parameter can be selected which is shown as below:
155 \arg CRC_CTL_PS_32: 32-bit polynomial for CRC calculation
156 \arg CRC_CTL_PS_16: 16-bit polynomial for CRC calculation
157 \arg CRC_CTL_PS_8: 8-bit polynomial for CRC calculation
158 \arg CRC_CTL_PS_7: 7-bit polynomial for CRC calculation
159 \param[out] none
160 \retval none
161 */
crc_polynomial_size_set(uint32_t poly_size)162 void crc_polynomial_size_set(uint32_t poly_size)
163 {
164 CRC_CTL &= (uint32_t)(~CRC_CTL_PS);
165 CRC_CTL |= (uint32_t)poly_size;
166 }
167
168 /*!
169 \brief configure the CRC polynomial value function
170 \param[in] poly: configurable polynomial value
171 \param[out] none
172 \retval none
173 */
crc_polynomial_set(uint32_t poly)174 void crc_polynomial_set(uint32_t poly)
175 {
176 CRC_POLY &= (uint32_t)(~CRC_POLY_POLY);
177 CRC_POLY = poly;
178 }
179
180 /*!
181 \brief CRC calculate single data
182 \param[in] sdata: specify input data
183 \param[in] data_format: input data format
184 only one parameter can be selected which is shown as below:
185 \arg INPUT_FORMAT_WORD: input data in word format
186 \arg INPUT_FORMAT_HALFWORD: input data in half-word format
187 \arg INPUT_FORMAT_BYTE: input data in byte format
188 \param[out] none
189 \retval CRC calculate value
190 */
crc_single_data_calculate(uint32_t sdata,uint8_t data_format)191 uint32_t crc_single_data_calculate(uint32_t sdata, uint8_t data_format)
192 {
193 if(INPUT_FORMAT_WORD == data_format) {
194 REG32(CRC) = sdata;
195 } else if(INPUT_FORMAT_HALFWORD == data_format) {
196 REG16(CRC) = (uint16_t)sdata;
197 } else {
198 REG8(CRC) = (uint8_t)sdata;
199 }
200
201 return(CRC_DATA);
202 }
203
204 /*!
205 \brief CRC calculate a data array
206 \param[in] array: pointer to the input data array
207 \param[in] size: size of the array
208 \param[in] data_format: input data format
209 only one parameter can be selected which is shown as below:
210 \arg INPUT_FORMAT_WORD: input data in word format
211 \arg INPUT_FORMAT_HALFWORD: input data in half-word format
212 \arg INPUT_FORMAT_BYTE: input data in byte format
213 \param[out] none
214 \retval CRC calculate value
215 */
crc_block_data_calculate(void * array,uint32_t size,uint8_t data_format)216 uint32_t crc_block_data_calculate(void *array, uint32_t size, uint8_t data_format)
217 {
218 uint8_t *data8;
219 uint16_t *data16;
220 uint32_t *data32;
221 uint32_t index;
222
223 if(INPUT_FORMAT_WORD == data_format) {
224 data32 = (uint32_t *)array;
225 for(index = 0U; index < size; index++) {
226 REG32(CRC) = data32[index];
227 }
228 } else if(INPUT_FORMAT_HALFWORD == data_format) {
229 data16 = (uint16_t *)array;
230 for(index = 0U; index < size; index++) {
231 REG16(CRC) = data16[index];
232 }
233 } else {
234 data8 = (uint8_t *)array;
235 for(index = 0U; index < size; index++) {
236 REG8(CRC) = data8[index];
237 }
238 }
239
240 return (CRC_DATA);
241 }
242
