1 /**
2 ******************************************************************************
3 * @file stm32u0xx_ll_i2c.c
4 * @author MCD Application Team
5 * @brief I2C LL module driver.
6 ******************************************************************************
7 * @attention
8 *
9 * Copyright (c) 2023 STMicroelectronics.
10 * All rights reserved.
11 *
12 * This software is licensed under terms that can be found in the LICENSE file
13 * in the root directory of this software component.
14 * If no LICENSE file comes with this software, it is provided AS-IS.
15 *
16 ******************************************************************************
17 */
18 #if defined(USE_FULL_LL_DRIVER)
19
20 /* Includes ------------------------------------------------------------------*/
21 #include "stm32u0xx_ll_i2c.h"
22 #include "stm32u0xx_ll_bus.h"
23 #ifdef USE_FULL_ASSERT
24 #include "stm32_assert.h"
25 #else
26 #define assert_param(expr) ((void)0U)
27 #endif /* USE_FULL_ASSERT */
28
29 /** @addtogroup STM32U0xx_LL_Driver
30 * @{
31 */
32
33 #if defined (I2C1) || defined (I2C2) || defined (I2C3) || defined (I2C4)
34
35 /** @defgroup I2C_LL I2C
36 * @{
37 */
38
39 /* Private types -------------------------------------------------------------*/
40 /* Private variables ---------------------------------------------------------*/
41 /* Private constants ---------------------------------------------------------*/
42 /* Private macros ------------------------------------------------------------*/
43 /** @addtogroup I2C_LL_Private_Macros
44 * @{
45 */
46
47 #define IS_LL_I2C_ANALOG_FILTER(__VALUE__) (((__VALUE__) == LL_I2C_ANALOGFILTER_ENABLE) || \
48 ((__VALUE__) == LL_I2C_ANALOGFILTER_DISABLE))
49
50 #define IS_LL_I2C_DIGITAL_FILTER(__VALUE__) ((__VALUE__) <= 0x0000000FU)
51
52 #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__) ((__VALUE__) <= 0x000003FFU)
53
54 #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__) (((__VALUE__) == LL_I2C_ACK) || \
55 ((__VALUE__) == LL_I2C_NACK))
56
57 #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__) (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \
58 ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT))
59 /**
60 * @}
61 */
62
63 /* Private function prototypes -----------------------------------------------*/
64
65 /* Exported functions --------------------------------------------------------*/
66 /** @addtogroup I2C_LL_Exported_Functions
67 * @{
68 */
69
70 /** @addtogroup I2C_LL_EF_Init
71 * @{
72 */
73
74 /**
75 * @brief De-initialize the I2C registers to their default reset values.
76 * @param I2Cx I2C Instance.
77 * @retval An ErrorStatus enumeration value:
78 * - SUCCESS: I2C registers are de-initialized
79 * - ERROR: I2C registers are not de-initialized
80 */
LL_I2C_DeInit(const I2C_TypeDef * I2Cx)81 ErrorStatus LL_I2C_DeInit(const I2C_TypeDef *I2Cx)
82 {
83 ErrorStatus status = SUCCESS;
84
85 /* Check the I2C Instance I2Cx */
86 assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
87
88 if (I2Cx == I2C1)
89 {
90 /* Force reset of I2C clock */
91 LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
92
93 /* Release reset of I2C clock */
94 LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
95 }
96 else if (I2Cx == I2C2)
97 {
98 /* Force reset of I2C clock */
99 LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2);
100
101 /* Release reset of I2C clock */
102 LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2);
103
104 }
105 else if (I2Cx == I2C3)
106 {
107 /* Force reset of I2C clock */
108 LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C3);
109
110 /* Release reset of I2C clock */
111 LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C3);
112 }
113 #if defined(I2C4)
114 else if (I2Cx == I2C4)
115 {
116 /* Force reset of I2C clock */
117 LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C4);
118
119 /* Release reset of I2C clock */
120 LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C4);
121 }
122 #endif /* I2C4 */
123 else
124 {
125 status = ERROR;
126 }
127
128 return status;
129 }
130
131 /**
132 * @brief Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
133 * @param I2Cx I2C Instance.
134 * @param I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
135 * @retval An ErrorStatus enumeration value:
136 * - SUCCESS: I2C registers are initialized
137 * - ERROR: Not applicable
138 */
LL_I2C_Init(I2C_TypeDef * I2Cx,const LL_I2C_InitTypeDef * I2C_InitStruct)139 ErrorStatus LL_I2C_Init(I2C_TypeDef *I2Cx, const LL_I2C_InitTypeDef *I2C_InitStruct)
140 {
141 /* Check the I2C Instance I2Cx */
142 assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
143
144 /* Check the I2C parameters from I2C_InitStruct */
145 assert_param(IS_LL_I2C_ANALOG_FILTER(I2C_InitStruct->AnalogFilter));
146 assert_param(IS_LL_I2C_DIGITAL_FILTER(I2C_InitStruct->DigitalFilter));
147 assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
148 assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
149 assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
150
151 /* Disable the selected I2Cx Peripheral */
152 LL_I2C_Disable(I2Cx);
153
154 /*---------------------------- I2Cx CR1 Configuration ------------------------
155 * Configure the analog and digital noise filters with parameters :
156 * - AnalogFilter: I2C_CR1_ANFOFF bit
157 * - DigitalFilter: I2C_CR1_DNF[3:0] bits
158 */
159 LL_I2C_ConfigFilters(I2Cx, I2C_InitStruct->AnalogFilter, I2C_InitStruct->DigitalFilter);
160
161 /*---------------------------- I2Cx TIMINGR Configuration --------------------
162 * Configure the SDA setup, hold time and the SCL high, low period with parameter :
163 * - Timing: I2C_TIMINGR_PRESC[3:0], I2C_TIMINGR_SCLDEL[3:0], I2C_TIMINGR_SDADEL[3:0],
164 * I2C_TIMINGR_SCLH[7:0] and I2C_TIMINGR_SCLL[7:0] bits
165 */
166 LL_I2C_SetTiming(I2Cx, I2C_InitStruct->Timing);
167
168 /* Enable the selected I2Cx Peripheral */
169 LL_I2C_Enable(I2Cx);
170
171 /*---------------------------- I2Cx OAR1 Configuration -----------------------
172 * Disable, Configure and Enable I2Cx device own address 1 with parameters :
173 * - OwnAddress1: I2C_OAR1_OA1[9:0] bits
174 * - OwnAddrSize: I2C_OAR1_OA1MODE bit
175 */
176 LL_I2C_DisableOwnAddress1(I2Cx);
177 LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
178
179 /* OwnAdress1 == 0 is reserved for General Call address */
180 if (I2C_InitStruct->OwnAddress1 != 0U)
181 {
182 LL_I2C_EnableOwnAddress1(I2Cx);
183 }
184
185 /*---------------------------- I2Cx CR2 Configuration ------------------------
186 * Configure the ACKnowledge or Non ACKnowledge condition
187 * after the address receive match code or next received byte with parameter :
188 * - TypeAcknowledge: I2C_CR2_NACK bit
189 */
190 LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);
191
192 return SUCCESS;
193 }
194
195 /**
196 * @brief Set each @ref LL_I2C_InitTypeDef field to default value.
197 * @param I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure.
198 * @retval None
199 */
LL_I2C_StructInit(LL_I2C_InitTypeDef * I2C_InitStruct)200 void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct)
201 {
202 /* Set I2C_InitStruct fields to default values */
203 I2C_InitStruct->Timing = 0U;
204 I2C_InitStruct->AnalogFilter = LL_I2C_ANALOGFILTER_ENABLE;
205 I2C_InitStruct->DigitalFilter = 0U;
206 I2C_InitStruct->OwnAddress1 = 0U;
207 I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
208 I2C_InitStruct->OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
209 }
210
211 /**
212 * @}
213 */
214
215 /**
216 * @}
217 */
218
219 /**
220 * @}
221 */
222
223 #endif /* I2C1 || I2C2 || I2C3 || I2C4 */
224
225 /**
226 * @}
227 */
228
229 #endif /* USE_FULL_LL_DRIVER */
230
