1 /**
2 ******************************************************************************
3 * @file stm32f1xx_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 "stm32f1xx_ll_i2c.h"
22 #include "stm32f1xx_ll_bus.h"
23 #include "stm32f1xx_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 STM32F1xx_LL_Driver
31 * @{
32 */
33
34 #if defined (I2C1) || defined (I2C2)
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 #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 /* I2C2 */
113 else
114 {
115 status = ERROR;
116 }
117
118 return status;
119 }
120
121 /**
122 * @brief Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
123 * @param I2Cx I2C Instance.
124 * @param I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
125 * @retval An ErrorStatus enumeration value:
126 * - SUCCESS I2C registers are initialized
127 * - ERROR Not applicable
128 */
LL_I2C_Init(I2C_TypeDef * I2Cx,LL_I2C_InitTypeDef * I2C_InitStruct)129 uint32_t LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct)
130 {
131 LL_RCC_ClocksTypeDef rcc_clocks;
132
133 /* Check the I2C Instance I2Cx */
134 assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
135
136 /* Check the I2C parameters from I2C_InitStruct */
137 assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
138 assert_param(IS_LL_I2C_CLOCK_SPEED(I2C_InitStruct->ClockSpeed));
139 assert_param(IS_LL_I2C_DUTY_CYCLE(I2C_InitStruct->DutyCycle));
140 assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
141 assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
142 assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
143
144 /* Disable the selected I2Cx Peripheral */
145 LL_I2C_Disable(I2Cx);
146
147 /* Retrieve Clock frequencies */
148 LL_RCC_GetSystemClocksFreq(&rcc_clocks);
149
150 /*---------------------------- I2Cx SCL Clock Speed Configuration ------------
151 * Configure the SCL speed :
152 * - ClockSpeed: I2C_CR2_FREQ[5:0], I2C_TRISE_TRISE[5:0], I2C_CCR_FS,
153 * and I2C_CCR_CCR[11:0] bits
154 * - DutyCycle: I2C_CCR_DUTY[7:0] bits
155 */
156 LL_I2C_ConfigSpeed(I2Cx, rcc_clocks.PCLK1_Frequency, I2C_InitStruct->ClockSpeed, I2C_InitStruct->DutyCycle);
157
158 /*---------------------------- I2Cx OAR1 Configuration -----------------------
159 * Disable, Configure and Enable I2Cx device own address 1 with parameters :
160 * - OwnAddress1: I2C_OAR1_ADD[9:8], I2C_OAR1_ADD[7:1] and I2C_OAR1_ADD0 bits
161 * - OwnAddrSize: I2C_OAR1_ADDMODE bit
162 */
163 LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
164
165 /*---------------------------- I2Cx MODE Configuration -----------------------
166 * Configure I2Cx peripheral mode with parameter :
167 * - PeripheralMode: I2C_CR1_SMBUS, I2C_CR1_SMBTYPE and I2C_CR1_ENARP bits
168 */
169 LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);
170
171 /* Enable the selected I2Cx Peripheral */
172 LL_I2C_Enable(I2Cx);
173
174 /*---------------------------- I2Cx CR2 Configuration ------------------------
175 * Configure the ACKnowledge or Non ACKnowledge condition
176 * after the address receive match code or next received byte with parameter :
177 * - TypeAcknowledge: I2C_CR2_NACK bit
178 */
179 LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);
180
181 return SUCCESS;
182 }
183
184 /**
185 * @brief Set each @ref LL_I2C_InitTypeDef field to default value.
186 * @param I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure.
187 * @retval None
188 */
LL_I2C_StructInit(LL_I2C_InitTypeDef * I2C_InitStruct)189 void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct)
190 {
191 /* Set I2C_InitStruct fields to default values */
192 I2C_InitStruct->PeripheralMode = LL_I2C_MODE_I2C;
193 I2C_InitStruct->ClockSpeed = 5000U;
194 I2C_InitStruct->DutyCycle = LL_I2C_DUTYCYCLE_2;
195 I2C_InitStruct->OwnAddress1 = 0U;
196 I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
197 I2C_InitStruct->OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
198 }
199
200 /**
201 * @}
202 */
203
204 /**
205 * @}
206 */
207
208 /**
209 * @}
210 */
211
212 #endif /* I2C1 || I2C2 */
213
214 /**
215 * @}
216 */
217
218 #endif /* USE_FULL_LL_DRIVER */
219
220
