1 /**
2 ******************************************************************************
3 * @file stm32l4xx_ll_i2c.c
4 * @author MCD Application Team
5 * @brief I2C LL module driver.
6 ******************************************************************************
7 * @attention
8 *
9 * <h2><center>© Copyright (c) 2017 STMicroelectronics.
10 * All rights reserved.</center></h2>
11 *
12 * This software component is licensed by ST under BSD 3-Clause license,
13 * the "License"; You may not use this file except in compliance with the
14 * License. You may obtain a copy of the License at:
15 * opensource.org/licenses/BSD-3-Clause
16 *
17 ******************************************************************************
18 */
19 #if defined(USE_FULL_LL_DRIVER)
20
21 /* Includes ------------------------------------------------------------------*/
22 #include "stm32l4xx_ll_i2c.h"
23 #include "stm32l4xx_ll_bus.h"
24 #ifdef USE_FULL_ASSERT
25 #include "stm32_assert.h"
26 #else
27 #define assert_param(expr) ((void)0U)
28 #endif
29
30 /** @addtogroup STM32L4xx_LL_Driver
31 * @{
32 */
33
34 #if defined (I2C1) || defined (I2C2) || defined (I2C3) || defined (I2C4)
35
36 /** @defgroup I2C_LL I2C
37 * @{
38 */
39
40 /* Private types -------------------------------------------------------------*/
41 /* Private variables ---------------------------------------------------------*/
42 /* Private constants ---------------------------------------------------------*/
43 /* Private macros ------------------------------------------------------------*/
44 /** @addtogroup I2C_LL_Private_Macros
45 * @{
46 */
47
48 #define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__) (((__VALUE__) == LL_I2C_MODE_I2C) || \
49 ((__VALUE__) == LL_I2C_MODE_SMBUS_HOST) || \
50 ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \
51 ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP))
52
53 #define IS_LL_I2C_ANALOG_FILTER(__VALUE__) (((__VALUE__) == LL_I2C_ANALOGFILTER_ENABLE) || \
54 ((__VALUE__) == LL_I2C_ANALOGFILTER_DISABLE))
55
56 #define IS_LL_I2C_DIGITAL_FILTER(__VALUE__) ((__VALUE__) <= 0x0000000FU)
57
58 #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__) ((__VALUE__) <= 0x000003FFU)
59
60 #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__) (((__VALUE__) == LL_I2C_ACK) || \
61 ((__VALUE__) == LL_I2C_NACK))
62
63 #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__) (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \
64 ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT))
65 /**
66 * @}
67 */
68
69 /* Private function prototypes -----------------------------------------------*/
70
71 /* Exported functions --------------------------------------------------------*/
72 /** @addtogroup I2C_LL_Exported_Functions
73 * @{
74 */
75
76 /** @addtogroup I2C_LL_EF_Init
77 * @{
78 */
79
80 /**
81 * @brief De-initialize the I2C registers to their default reset values.
82 * @param I2Cx I2C Instance.
83 * @retval An ErrorStatus enumeration value:
84 * - SUCCESS: I2C registers are de-initialized
85 * - ERROR: I2C registers are not de-initialized
86 */
LL_I2C_DeInit(I2C_TypeDef * I2Cx)87 ErrorStatus LL_I2C_DeInit(I2C_TypeDef *I2Cx)
88 {
89 ErrorStatus status = SUCCESS;
90
91 /* Check the I2C Instance I2Cx */
92 assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
93
94 if (I2Cx == I2C1)
95 {
96 /* Force reset of I2C clock */
97 LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
98
99 /* Release reset of I2C clock */
100 LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
101 }
102 #if defined(I2C2)
103 else if (I2Cx == I2C2)
104 {
105 /* Force reset of I2C clock */
106 LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2);
107
108 /* Release reset of I2C clock */
109 LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2);
110
111 }
112 #endif
113 else if (I2Cx == I2C3)
114 {
115 /* Force reset of I2C clock */
116 LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C3);
117
118 /* Release reset of I2C clock */
119 LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C3);
120 }
121 #if defined(I2C4)
122 else if (I2Cx == I2C4)
123 {
124 /* Force reset of I2C clock */
125 LL_APB1_GRP2_ForceReset(LL_APB1_GRP2_PERIPH_I2C4);
126
127 /* Release reset of I2C clock */
128 LL_APB1_GRP2_ReleaseReset(LL_APB1_GRP2_PERIPH_I2C4);
129 }
130 #endif
131 else
132 {
133 status = ERROR;
134 }
135
136 return status;
137 }
138
139 /**
140 * @brief Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
141 * @param I2Cx I2C Instance.
142 * @param I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
143 * @retval An ErrorStatus enumeration value:
144 * - SUCCESS: I2C registers are initialized
145 * - ERROR: Not applicable
146 */
LL_I2C_Init(I2C_TypeDef * I2Cx,LL_I2C_InitTypeDef * I2C_InitStruct)147 ErrorStatus LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct)
148 {
149 /* Check the I2C Instance I2Cx */
150 assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
151
152 /* Check the I2C parameters from I2C_InitStruct */
153 assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
154 assert_param(IS_LL_I2C_ANALOG_FILTER(I2C_InitStruct->AnalogFilter));
155 assert_param(IS_LL_I2C_DIGITAL_FILTER(I2C_InitStruct->DigitalFilter));
156 assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
157 assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
158 assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
159
160 /* Disable the selected I2Cx Peripheral */
161 LL_I2C_Disable(I2Cx);
162
163 /*---------------------------- I2Cx CR1 Configuration ------------------------
164 * Configure the analog and digital noise filters with parameters :
165 * - AnalogFilter: I2C_CR1_ANFOFF bit
166 * - DigitalFilter: I2C_CR1_DNF[3:0] bits
167 */
168 LL_I2C_ConfigFilters(I2Cx, I2C_InitStruct->AnalogFilter, I2C_InitStruct->DigitalFilter);
169
170 /*---------------------------- I2Cx TIMINGR Configuration --------------------
171 * Configure the SDA setup, hold time and the SCL high, low period with parameter :
172 * - Timing: I2C_TIMINGR_PRESC[3:0], I2C_TIMINGR_SCLDEL[3:0], I2C_TIMINGR_SDADEL[3:0],
173 * I2C_TIMINGR_SCLH[7:0] and I2C_TIMINGR_SCLL[7:0] bits
174 */
175 LL_I2C_SetTiming(I2Cx, I2C_InitStruct->Timing);
176
177 /* Enable the selected I2Cx Peripheral */
178 LL_I2C_Enable(I2Cx);
179
180 /*---------------------------- I2Cx OAR1 Configuration -----------------------
181 * Disable, Configure and Enable I2Cx device own address 1 with parameters :
182 * - OwnAddress1: I2C_OAR1_OA1[9:0] bits
183 * - OwnAddrSize: I2C_OAR1_OA1MODE bit
184 */
185 LL_I2C_DisableOwnAddress1(I2Cx);
186 LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
187
188 /* OwnAdress1 == 0 is reserved for General Call address */
189 if (I2C_InitStruct->OwnAddress1 != 0U)
190 {
191 LL_I2C_EnableOwnAddress1(I2Cx);
192 }
193
194 /*---------------------------- I2Cx MODE Configuration -----------------------
195 * Configure I2Cx peripheral mode with parameter :
196 * - PeripheralMode: I2C_CR1_SMBDEN and I2C_CR1_SMBHEN bits
197 */
198 LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);
199
200 /*---------------------------- I2Cx CR2 Configuration ------------------------
201 * Configure the ACKnowledge or Non ACKnowledge condition
202 * after the address receive match code or next received byte with parameter :
203 * - TypeAcknowledge: I2C_CR2_NACK bit
204 */
205 LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);
206
207 return SUCCESS;
208 }
209
210 /**
211 * @brief Set each @ref LL_I2C_InitTypeDef field to default value.
212 * @param I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure.
213 * @retval None
214 */
LL_I2C_StructInit(LL_I2C_InitTypeDef * I2C_InitStruct)215 void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct)
216 {
217 /* Set I2C_InitStruct fields to default values */
218 I2C_InitStruct->PeripheralMode = LL_I2C_MODE_I2C;
219 I2C_InitStruct->Timing = 0U;
220 I2C_InitStruct->AnalogFilter = LL_I2C_ANALOGFILTER_ENABLE;
221 I2C_InitStruct->DigitalFilter = 0U;
222 I2C_InitStruct->OwnAddress1 = 0U;
223 I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
224 I2C_InitStruct->OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
225 }
226
227 /**
228 * @}
229 */
230
231 /**
232 * @}
233 */
234
235 /**
236 * @}
237 */
238
239 #endif /* I2C1 || I2C2 || I2C3 || I2C4 */
240
241 /**
242 * @}
243 */
244
245 #endif /* USE_FULL_LL_DRIVER */
246
247 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
248