1 /*!
2 \file gd32f4xx_trng.c
3 \brief TRNG driver
4
5 \version 2016-08-15, V1.0.0, firmware for GD32F4xx
6 \version 2018-12-12, V2.0.0, firmware for GD32F4xx
7 \version 2020-09-30, V2.1.0, firmware for GD32F4xx
8 \version 2022-03-09, V3.0.0, firmware for GD32F4xx
9 */
10
11 /*
12 Copyright (c) 2022, GigaDevice Semiconductor Inc.
13
14 Redistribution and use in source and binary forms, with or without modification,
15 are permitted provided that the following conditions are met:
16
17 1. Redistributions of source code must retain the above copyright notice, this
18 list of conditions and the following disclaimer.
19 2. Redistributions in binary form must reproduce the above copyright notice,
20 this list of conditions and the following disclaimer in the documentation
21 and/or other materials provided with the distribution.
22 3. Neither the name of the copyright holder nor the names of its contributors
23 may be used to endorse or promote products derived from this software without
24 specific prior written permission.
25
26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
28 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
29 IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
30 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
31 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
32 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
33 WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
35 OF SUCH DAMAGE.
36 */
37
38 #include "gd32f4xx_trng.h"
39
40 /*!
41 \brief deinitialize the TRNG
42 \param[in] none
43 \param[out] none
44 \retval none
45 */
trng_deinit(void)46 void trng_deinit(void)
47 {
48 rcu_periph_reset_enable(RCU_TRNGRST);
49 rcu_periph_reset_disable(RCU_TRNGRST);
50 }
51
52 /*!
53 \brief enable the TRNG interface
54 \param[in] none
55 \param[out] none
56 \retval none
57 */
trng_enable(void)58 void trng_enable(void)
59 {
60 TRNG_CTL |= TRNG_CTL_TRNGEN;
61 }
62
63 /*!
64 \brief disable the TRNG interface
65 \param[in] none
66 \param[out] none
67 \retval none
68 */
trng_disable(void)69 void trng_disable(void)
70 {
71 TRNG_CTL &= ~TRNG_CTL_TRNGEN;
72 }
73
74 /*!
75 \brief get the true random data
76 \param[in] none
77 \param[out] none
78 \retval the generated random data
79 */
trng_get_true_random_data(void)80 uint32_t trng_get_true_random_data(void)
81 {
82 return (TRNG_DATA);
83 }
84
85 /*!
86 \brief enable the TRNG interrupt
87 \param[in] none
88 \param[out] none
89 \retval none
90 */
trng_interrupt_enable(void)91 void trng_interrupt_enable(void)
92 {
93 TRNG_CTL |= TRNG_CTL_IE;
94 }
95
96 /*!
97 \brief disable the TRNG interrupt
98 \param[in] none
99 \param[out] none
100 \retval none
101 */
trng_interrupt_disable(void)102 void trng_interrupt_disable(void)
103 {
104 TRNG_CTL &= ~TRNG_CTL_IE;
105 }
106
107 /*!
108 \brief get the trng status flags
109 \param[in] flag: trng status flag, refer to trng_flag_enum
110 only one parameter can be selected which is shown as below:
111 \arg TRNG_FLAG_DRDY: Random Data ready status
112 \arg TRNG_FLAG_CECS: Clock error current status
113 \arg TRNG_FLAG_SECS: Seed error current status
114 \param[out] none
115 \retval FlagStatus: SET or RESET
116 */
trng_flag_get(trng_flag_enum flag)117 FlagStatus trng_flag_get(trng_flag_enum flag)
118 {
119 if(RESET != (TRNG_STAT & flag)) {
120 return SET;
121 } else {
122 return RESET;
123 }
124 }
125
126 /*!
127 \brief get the trng interrupt flags
128 \param[in] int_flag: trng interrupt flag, refer to trng_int_flag_enum
129 only one parameter can be selected which is shown as below:
130 \arg TRNG_INT_FLAG_CEIF: clock error interrupt flag
131 \arg TRNG_INT_FLAG_SEIF: Seed error interrupt flag
132 \param[out] none
133 \retval FlagStatus: SET or RESET
134 */
trng_interrupt_flag_get(trng_int_flag_enum int_flag)135 FlagStatus trng_interrupt_flag_get(trng_int_flag_enum int_flag)
136 {
137 if(RESET != (TRNG_STAT & int_flag)) {
138 return SET;
139 } else {
140 return RESET;
141 }
142 }
143
144 /*!
145 \brief clear the trng interrupt flags
146 \param[in] int_flag: trng interrupt flag, refer to trng_int_flag_enum
147 only one parameter can be selected which is shown as below:
148 \arg TRNG_INT_FLAG_CEIF: clock error interrupt flag
149 \arg TRNG_INT_FLAG_SEIF: Seed error interrupt flag
150 \param[out] none
151 \retval none
152 */
trng_interrupt_flag_clear(trng_int_flag_enum int_flag)153 void trng_interrupt_flag_clear(trng_int_flag_enum int_flag)
154 {
155 TRNG_STAT &= ~(uint32_t)int_flag;
156 }
157
