1 /**
2 ******************************************************************************
3 * @file stm32l1xx_ll_i2c.c
4 * @author MCD Application Team
5 * @brief I2C LL module driver.
6 ******************************************************************************
7 * @attention
8 *
9 * <h2><center>© Copyright (c) 2016 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 "stm32l1xx_ll_i2c.h"
23 #include "stm32l1xx_ll_bus.h"
24 #include "stm32l1xx_ll_rcc.h"
25 #ifdef USE_FULL_ASSERT
26 #include "stm32_assert.h"
27 #else
28 #define assert_param(expr) ((void)0U)
29 #endif
30
31 /** @addtogroup STM32L1xx_LL_Driver
32 * @{
33 */
34
35 #if defined (I2C1) || defined (I2C2)
36
37 /** @defgroup I2C_LL I2C
38 * @{
39 */
40
41 /* Private types -------------------------------------------------------------*/
42 /* Private variables ---------------------------------------------------------*/
43 /* Private constants ---------------------------------------------------------*/
44 /* Private macros ------------------------------------------------------------*/
45 /** @addtogroup I2C_LL_Private_Macros
46 * @{
47 */
48
49 #define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__) (((__VALUE__) == LL_I2C_MODE_I2C) || \
50 ((__VALUE__) == LL_I2C_MODE_SMBUS_HOST) || \
51 ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \
52 ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP))
53
54 #define IS_LL_I2C_CLOCK_SPEED(__VALUE__) (((__VALUE__) > 0U) && ((__VALUE__) <= LL_I2C_MAX_SPEED_FAST))
55
56 #define IS_LL_I2C_DUTY_CYCLE(__VALUE__) (((__VALUE__) == LL_I2C_DUTYCYCLE_2) || \
57 ((__VALUE__) == LL_I2C_DUTYCYCLE_16_9))
58
59 #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__) ((__VALUE__) <= 0x000003FFU)
60
61 #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__) (((__VALUE__) == LL_I2C_ACK) || \
62 ((__VALUE__) == LL_I2C_NACK))
63
64 #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__) (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \
65 ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT))
66 /**
67 * @}
68 */
69
70 /* Private function prototypes -----------------------------------------------*/
71
72 /* Exported functions --------------------------------------------------------*/
73 /** @addtogroup I2C_LL_Exported_Functions
74 * @{
75 */
76
77 /** @addtogroup I2C_LL_EF_Init
78 * @{
79 */
80
81 /**
82 * @brief De-initialize the I2C registers to their default reset values.
83 * @param I2Cx I2C Instance.
84 * @retval An ErrorStatus enumeration value:
85 * - SUCCESS I2C registers are de-initialized
86 * - ERROR I2C registers are not de-initialized
87 */
LL_I2C_DeInit(I2C_TypeDef * I2Cx)88 uint32_t LL_I2C_DeInit(I2C_TypeDef *I2Cx)
89 {
90 ErrorStatus status = SUCCESS;
91
92 /* Check the I2C Instance I2Cx */
93 assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
94
95 if (I2Cx == I2C1)
96 {
97 /* Force reset of I2C clock */
98 LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
99
100 /* Release reset of I2C clock */
101 LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
102 }
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 else
113 {
114 status = ERROR;
115 }
116
117 return status;
118 }
119
120 /**
121 * @brief Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
122 * @param I2Cx I2C Instance.
123 * @param I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
124 * @retval An ErrorStatus enumeration value:
125 * - SUCCESS I2C registers are initialized
126 * - ERROR Not applicable
127 */
LL_I2C_Init(I2C_TypeDef * I2Cx,LL_I2C_InitTypeDef * I2C_InitStruct)128 uint32_t LL_I2C_Init(I2C_TypeDef *I2Cx, LL_I2C_InitTypeDef *I2C_InitStruct)
129 {
130 LL_RCC_ClocksTypeDef rcc_clocks;
131
132 /* Check the I2C Instance I2Cx */
133 assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
134
135 /* Check the I2C parameters from I2C_InitStruct */
136 assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
137 assert_param(IS_LL_I2C_CLOCK_SPEED(I2C_InitStruct->ClockSpeed));
138 assert_param(IS_LL_I2C_DUTY_CYCLE(I2C_InitStruct->DutyCycle));
139 assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
140 assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
141 assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
142
143 /* Disable the selected I2Cx Peripheral */
144 LL_I2C_Disable(I2Cx);
145
146 /* Retrieve Clock frequencies */
147 LL_RCC_GetSystemClocksFreq(&rcc_clocks);
148
149 /*---------------------------- I2Cx SCL Clock Speed Configuration ------------
150 * Configure the SCL speed :
151 * - ClockSpeed: I2C_CR2_FREQ[5:0], I2C_TRISE_TRISE[5:0], I2C_CCR_FS,
152 * and I2C_CCR_CCR[11:0] bits
153 * - DutyCycle: I2C_CCR_DUTY[7:0] bits
154 */
155 LL_I2C_ConfigSpeed(I2Cx, rcc_clocks.PCLK1_Frequency, I2C_InitStruct->ClockSpeed, I2C_InitStruct->DutyCycle);
156
157 /*---------------------------- I2Cx OAR1 Configuration -----------------------
158 * Disable, Configure and Enable I2Cx device own address 1 with parameters :
159 * - OwnAddress1: I2C_OAR1_ADD[9:8], I2C_OAR1_ADD[7:1] and I2C_OAR1_ADD0 bits
160 * - OwnAddrSize: I2C_OAR1_ADDMODE bit
161 */
162 LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
163
164 /*---------------------------- I2Cx MODE Configuration -----------------------
165 * Configure I2Cx peripheral mode with parameter :
166 * - PeripheralMode: I2C_CR1_SMBUS, I2C_CR1_SMBTYPE and I2C_CR1_ENARP bits
167 */
168 LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);
169
170 /* Enable the selected I2Cx Peripheral */
171 LL_I2C_Enable(I2Cx);
172
173 /*---------------------------- I2Cx CR2 Configuration ------------------------
174 * Configure the ACKnowledge or Non ACKnowledge condition
175 * after the address receive match code or next received byte with parameter :
176 * - TypeAcknowledge: I2C_CR2_NACK bit
177 */
178 LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);
179
180 return SUCCESS;
181 }
182
183 /**
184 * @brief Set each @ref LL_I2C_InitTypeDef field to default value.
185 * @param I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure.
186 * @retval None
187 */
LL_I2C_StructInit(LL_I2C_InitTypeDef * I2C_InitStruct)188 void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct)
189 {
190 /* Set I2C_InitStruct fields to default values */
191 I2C_InitStruct->PeripheralMode = LL_I2C_MODE_I2C;
192 I2C_InitStruct->ClockSpeed = 5000U;
193 I2C_InitStruct->DutyCycle = LL_I2C_DUTYCYCLE_2;
194 I2C_InitStruct->OwnAddress1 = 0U;
195 I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
196 I2C_InitStruct->OwnAddrSize = LL_I2C_OWNADDRESS1_7BIT;
197 }
198
199 /**
200 * @}
201 */
202
203 /**
204 * @}
205 */
206
207 /**
208 * @}
209 */
210
211 #endif /* I2C1 || I2C2 */
212
213 /**
214 * @}
215 */
216
217 #endif /* USE_FULL_LL_DRIVER */
218
219 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
220
