1 /**
2 ******************************************************************************
3 * @file stm32f2xx_ll_i2c.c
4 * @author MCD Application Team
5 * @brief I2C LL module driver.
6 ******************************************************************************
7 * @attention
8 *
9 * Copyright (c) 2016 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 "stm32f2xx_ll_i2c.h"
22 #include "stm32f2xx_ll_bus.h"
23 #include "stm32f2xx_ll_rcc.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 STM32F2xx_LL_Driver
31 * @{
32 */
33
34 #if defined (I2C1) || defined (I2C2) || defined (I2C3)
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_CLOCK_SPEED(__VALUE__) (((__VALUE__) > 0U) && ((__VALUE__) <= LL_I2C_MAX_SPEED_FAST))
54
55 #define IS_LL_I2C_DUTY_CYCLE(__VALUE__) (((__VALUE__) == LL_I2C_DUTYCYCLE_2) || \
56 ((__VALUE__) == LL_I2C_DUTYCYCLE_16_9))
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 uint32_t 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 else if (I2Cx == I2C2)
103 {
104 /* Force reset of I2C clock */
105 LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2);
106
107 /* Release reset of I2C clock */
108 LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2);
109
110 }
111 else if (I2Cx == I2C3)
112 {
113 /* Force reset of I2C clock */
114 LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C3);
115
116 /* Release reset of I2C clock */
117 LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C3);
118 }
119 else
120 {
121 status = ERROR;
122 }
123
124 return status;
125 }
126
127 /**
128 * @brief Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
129 * @param I2Cx I2C Instance.
130 * @param I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
131 * @retval An ErrorStatus enumeration value:
132 * - SUCCESS I2C registers are initialized
133 * - ERROR Not applicable
134 */
LL_I2C_Init(I2C_TypeDef * I2Cx,LL_I2C_InitTypeDef * I2C_InitStruct)135 uint32_t LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct)
136 {
137 LL_RCC_ClocksTypeDef rcc_clocks;
138
139 /* Check the I2C Instance I2Cx */
140 assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
141
142 /* Check the I2C parameters from I2C_InitStruct */
143 assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
144 assert_param(IS_LL_I2C_CLOCK_SPEED(I2C_InitStruct->ClockSpeed));
145 assert_param(IS_LL_I2C_DUTY_CYCLE(I2C_InitStruct->DutyCycle));
146 assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
147 assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
148 assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
149
150 /* Disable the selected I2Cx Peripheral */
151 LL_I2C_Disable(I2Cx);
152
153 /* Retrieve Clock frequencies */
154 LL_RCC_GetSystemClocksFreq(&rcc_clocks);
155
156 /*---------------------------- I2Cx SCL Clock Speed Configuration ------------
157 * Configure the SCL speed :
158 * - ClockSpeed: I2C_CR2_FREQ[5:0], I2C_TRISE_TRISE[5:0], I2C_CCR_FS,
159 * and I2C_CCR_CCR[11:0] bits
160 * - DutyCycle: I2C_CCR_DUTY[7:0] bits
161 */
162 LL_I2C_ConfigSpeed(I2Cx, rcc_clocks.PCLK1_Frequency, I2C_InitStruct->ClockSpeed, I2C_InitStruct->DutyCycle);
163
164 /*---------------------------- I2Cx OAR1 Configuration -----------------------
165 * Disable, Configure and Enable I2Cx device own address 1 with parameters :
166 * - OwnAddress1: I2C_OAR1_ADD[9:8], I2C_OAR1_ADD[7:1] and I2C_OAR1_ADD0 bits
167 * - OwnAddrSize: I2C_OAR1_ADDMODE bit
168 */
169 LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
170
171 /*---------------------------- I2Cx MODE Configuration -----------------------
172 * Configure I2Cx peripheral mode with parameter :
173 * - PeripheralMode: I2C_CR1_SMBUS, I2C_CR1_SMBTYPE and I2C_CR1_ENARP bits
174 */
175 LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);
176
177 /* Enable the selected I2Cx Peripheral */
178 LL_I2C_Enable(I2Cx);
179
180 /*---------------------------- I2Cx CR2 Configuration ------------------------
181 * Configure the ACKnowledge or Non ACKnowledge condition
182 * after the address receive match code or next received byte with parameter :
183 * - TypeAcknowledge: I2C_CR2_NACK bit
184 */
185 LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);
186
187 return SUCCESS;
188 }
189
190 /**
191 * @brief Set each @ref LL_I2C_InitTypeDef field to default value.
192 * @param I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure.
193 * @retval None
194 */
LL_I2C_StructInit(LL_I2C_InitTypeDef * I2C_InitStruct)195 void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct)
196 {
197 /* Set I2C_InitStruct fields to default values */
198 I2C_InitStruct->PeripheralMode = LL_I2C_MODE_I2C;
199 I2C_InitStruct->ClockSpeed = 5000U;
200 I2C_InitStruct->DutyCycle = LL_I2C_DUTYCYCLE_2;
201 I2C_InitStruct->OwnAddress1 = 0U;
202 I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
203 I2C_InitStruct->OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
204 }
205
206 /**
207 * @}
208 */
209
210 /**
211 * @}
212 */
213
214 /**
215 * @}
216 */
217
218 #endif /* I2C1 || I2C2 || I2C3 */
219
220 /**
221 * @}
222 */
223
224 #endif /* USE_FULL_LL_DRIVER */
225
226
