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1 
/**
 1 
/**
2 
  ******************************************************************************
 2 
  ******************************************************************************
3 
  * @file    stm32l1xx_ll_i2c.c
 3 
  * @file    stm32l1xx_ll_i2c.c
4 
  * @author  MCD Application Team
 4 
  * @author  MCD Application Team
5 
  * @brief   I2C LL module driver.
 5 
  * @brief   I2C LL module driver.
6 
  ******************************************************************************
 6 
  ******************************************************************************
7 
  * @attention
 7 
  * @attention
8 
  *
 8 
  *
9 
  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
 9 
  * Copyright (c) 2016 STMicroelectronics.
10 
  * All rights reserved.</center></h2>
 10 
  * All rights reserved.
11 
  *
 11 
  *
12 
  * This software component is licensed by ST under BSD 3-Clause license,
 12 
  * This software is licensed under terms that can be found in the LICENSE file
13 
  * the "License"; You may not use this file except in compliance with the
 13 
  * in the root directory of this software component.
14 
  * License. You may obtain a copy of the License at:
 14 
  * If no LICENSE file comes with this software, it is provided AS-IS.
15 
  *                        opensource.org/licenses/BSD-3-Clause
 15 
  *
16 
  *
 16 
  ******************************************************************************
17 
  ******************************************************************************
 17 
  */
18 
  */
 18 
#if defined(USE_FULL_LL_DRIVER)
19 
#if defined(USE_FULL_LL_DRIVER)
 19 
 
20 
 
 20 
/* Includes ------------------------------------------------------------------*/
21 
/* Includes ------------------------------------------------------------------*/
 21 
#include "stm32l1xx_ll_i2c.h"
22 
#include "stm32l1xx_ll_i2c.h"
 22 
#include "stm32l1xx_ll_bus.h"
23 
#include "stm32l1xx_ll_bus.h"
 23 
#include "stm32l1xx_ll_rcc.h"
24 
#include "stm32l1xx_ll_rcc.h"
 24 
#ifdef  USE_FULL_ASSERT
25 
#ifdef  USE_FULL_ASSERT
 25 
#include "stm32_assert.h"
26 
#include "stm32_assert.h"
 26 
#else
27 
#else
 27 
#define assert_param(expr) ((void)0U)
28 
#define assert_param(expr) ((void)0U)
 28 
#endif
29 
#endif
 29 
 
30 
 
 30 
/** @addtogroup STM32L1xx_LL_Driver
31 
/** @addtogroup STM32L1xx_LL_Driver
 31 
  * @{
32 
  * @{
 32 
  */
33 
  */
 33 
 
34 
 
 34 
#if defined (I2C1) || defined (I2C2)
35 
#if defined (I2C1) || defined (I2C2)
 35 
 
36 
 
 36 
/** @defgroup I2C_LL I2C
37 
/** @defgroup I2C_LL I2C
 37 
  * @{
38 
  * @{
 38 
  */
39 
  */
 39 
 
40 
 
 40 
/* Private types -------------------------------------------------------------*/
41 
/* Private types -------------------------------------------------------------*/
 41 
/* Private variables ---------------------------------------------------------*/
42 
/* Private variables ---------------------------------------------------------*/
 42 
/* Private constants ---------------------------------------------------------*/
43 
/* Private constants ---------------------------------------------------------*/
 43 
/* Private macros ------------------------------------------------------------*/
44 
/* Private macros ------------------------------------------------------------*/
 44 
/** @addtogroup I2C_LL_Private_Macros
45 
/** @addtogroup I2C_LL_Private_Macros
 45 
  * @{
46 
  * @{
 46 
  */
47 
  */
 47 
 
48 
 
 48 
#define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__)    (((__VALUE__) == LL_I2C_MODE_I2C)          || \
49 
#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_HOST)   || \
 50 
                                                 ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \
51 
                                                 ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \
 51 
                                                 ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP))
52 
                                                 ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP))
 52 
 
53 
 
 53 
#define IS_LL_I2C_CLOCK_SPEED(__VALUE__)           (((__VALUE__) > 0U) && ((__VALUE__) <= LL_I2C_MAX_SPEED_FAST))
54 
#define IS_LL_I2C_CLOCK_SPEED(__VALUE__)           (((__VALUE__) > 0U) && ((__VALUE__) <= LL_I2C_MAX_SPEED_FAST))
 54 
 
55 
 
 55 
#define IS_LL_I2C_DUTY_CYCLE(__VALUE__)            (((__VALUE__) == LL_I2C_DUTYCYCLE_2) || \
56 
#define IS_LL_I2C_DUTY_CYCLE(__VALUE__)            (((__VALUE__) == LL_I2C_DUTYCYCLE_2) || \
 56 
                                                 ((__VALUE__) == LL_I2C_DUTYCYCLE_16_9))
57 
                                                 ((__VALUE__) == LL_I2C_DUTYCYCLE_16_9))
 57 
 
58 
 
 58 
#define IS_LL_I2C_OWN_ADDRESS1(__VALUE__)       ((__VALUE__) <= 0x000003FFU)
59 
#define IS_LL_I2C_OWN_ADDRESS1(__VALUE__)       ((__VALUE__) <= 0x000003FFU)
 59 
 
60 
 
 60 
#define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__)   (((__VALUE__) == LL_I2C_ACK) || \
61 
#define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__)   (((__VALUE__) == LL_I2C_ACK) || \
 61 
                                                 ((__VALUE__) == LL_I2C_NACK))
62 
                                                 ((__VALUE__) == LL_I2C_NACK))
 62 
 
63 
 
 63 
#define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__)       (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \
64 
#define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__)       (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \
 64 
                                                 ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT))
65 
                                                 ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT))
 65 
/**
66 
/**
 66 
  * @}
67 
  * @}
 67 
  */
68 
  */
 68 
 
69 
 
 69 
/* Private function prototypes -----------------------------------------------*/
70 
/* Private function prototypes -----------------------------------------------*/
 70 
 
71 
 
 71 
/* Exported functions --------------------------------------------------------*/
72 
/* Exported functions --------------------------------------------------------*/
 72 
/** @addtogroup I2C_LL_Exported_Functions
73 
/** @addtogroup I2C_LL_Exported_Functions
 73 
  * @{
74 
  * @{
 74 
  */
75 
  */
 75 
 
76 
 
 76 
/** @addtogroup I2C_LL_EF_Init
77 
/** @addtogroup I2C_LL_EF_Init
 77 
  * @{
78 
  * @{
 78 
  */
79 
  */
 79 
 
80 
 
 80 
/**
81 
/**
 81 
  * @brief  De-initialize the I2C registers to their default reset values.
82 
  * @brief  De-initialize the I2C registers to their default reset values.
 82 
  * @param  I2Cx I2C Instance.
83 
  * @param  I2Cx I2C Instance.
 83 
  * @retval An ErrorStatus enumeration value:
84 
  * @retval An ErrorStatus enumeration value:
 84 
  *          - SUCCESS  I2C registers are de-initialized
85 
  *          - SUCCESS  I2C registers are de-initialized
 85 
  *          - ERROR  I2C registers are not de-initialized
86 
  *          - ERROR  I2C registers are not de-initialized
 86 
  */
87 
  */
 87 
uint32_t LL_I2C_DeInit(I2C_TypeDef *I2Cx)
88 
uint32_t LL_I2C_DeInit(I2C_TypeDef *I2Cx)
 88 
{
89 
{
 89 
  ErrorStatus status = SUCCESS;
90 
  ErrorStatus status = SUCCESS;
 90 
 
91 
 
 91 
  /* Check the I2C Instance I2Cx */
92 
  /* Check the I2C Instance I2Cx */
 92 
  assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
93 
  assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
 93 
 
94 
 
 94 
  if (I2Cx == I2C1)
95 
  if (I2Cx == I2C1)
 95 
  {
96 
  {
 96 
    /* Force reset of I2C clock */
97 
    /* Force reset of I2C clock */
 97 
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
98 
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
 98 
 
99 
 
 99 
    /* Release reset of I2C clock */
100 
    /* Release reset of I2C clock */
 100 
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
101 
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
 101 
  }
102 
  }
 102 
  else if (I2Cx == I2C2)
103 
  else if (I2Cx == I2C2)
 103 
  {
104 
  {
 104 
    /* Force reset of I2C clock */
105 
    /* Force reset of I2C clock */
 105 
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2);
106 
    LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C2);
 106 
 
107 
 
 107 
    /* Release reset of I2C clock */
108 
    /* Release reset of I2C clock */
 108 
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2);
109 
    LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C2);
 109 
 
110 
 
 110 
  }
111 
  }
 111 
  else
112 
  else
 112 
  {
113 
  {
 113 
    status = ERROR;
114 
    status = ERROR;
 114 
  }
115 
  }
 115 
 
116 
 
 116 
  return status;
117 
  return status;
 117 
}
118 
}
 118 
 
119 
 
 119 
/**
120 
/**
 120 
  * @brief  Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
121 
  * @brief  Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
 121 
  * @param  I2Cx I2C Instance.
122 
  * @param  I2Cx I2C Instance.
 122 
  * @param  I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
123 
  * @param  I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
 123 
  * @retval An ErrorStatus enumeration value:
124 
  * @retval An ErrorStatus enumeration value:
 124 
  *          - SUCCESS  I2C registers are initialized
125 
  *          - SUCCESS  I2C registers are initialized
 125 
  *          - ERROR  Not applicable
126 
  *          - ERROR  Not applicable
 126 
  */
127 
  */
 127 
uint32_t 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)
 128 
{
129 
{
 129 
  LL_RCC_ClocksTypeDef rcc_clocks;
130 
  LL_RCC_ClocksTypeDef rcc_clocks;
 130 
 
131 
 
 131 
  /* Check the I2C Instance I2Cx */
132 
  /* Check the I2C Instance I2Cx */
 132 
  assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
133 
  assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
 133 
 
134 
 
 134 
  /* Check the I2C parameters from I2C_InitStruct */
135 
  /* Check the I2C parameters from I2C_InitStruct */
 135 
  assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
136 
  assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
 136 
  assert_param(IS_LL_I2C_CLOCK_SPEED(I2C_InitStruct->ClockSpeed));
137 
  assert_param(IS_LL_I2C_CLOCK_SPEED(I2C_InitStruct->ClockSpeed));
 137 
  assert_param(IS_LL_I2C_DUTY_CYCLE(I2C_InitStruct->DutyCycle));
138 
  assert_param(IS_LL_I2C_DUTY_CYCLE(I2C_InitStruct->DutyCycle));
 138 
  assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
139 
  assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
 139 
  assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
140 
  assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
 140 
  assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
141 
  assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
 141 
 
142 
 
 142 
  /* Disable the selected I2Cx Peripheral */
143 
  /* Disable the selected I2Cx Peripheral */
 143 
  LL_I2C_Disable(I2Cx);
144 
  LL_I2C_Disable(I2Cx);
 144 
 
145 
 
 145 
  /* Retrieve Clock frequencies */
146 
  /* Retrieve Clock frequencies */
 146 
  LL_RCC_GetSystemClocksFreq(&rcc_clocks);
147 
  LL_RCC_GetSystemClocksFreq(&rcc_clocks);
 147 
 
148 
 
 148 
  /*---------------------------- I2Cx SCL Clock Speed Configuration ------------
149 
  /*---------------------------- I2Cx SCL Clock Speed Configuration ------------
 149 
   * Configure the SCL speed :
150 
   * Configure the SCL speed :
 150 
   * - ClockSpeed: I2C_CR2_FREQ[5:0], I2C_TRISE_TRISE[5:0], I2C_CCR_FS,
151 
   * - ClockSpeed: I2C_CR2_FREQ[5:0], I2C_TRISE_TRISE[5:0], I2C_CCR_FS,
 151 
   *           and I2C_CCR_CCR[11:0] bits
152 
   *           and I2C_CCR_CCR[11:0] bits
 152 
   * - DutyCycle: I2C_CCR_DUTY[7:0] bits
153 
   * - DutyCycle: I2C_CCR_DUTY[7:0] bits
 153 
   */
154 
   */
 154 
  LL_I2C_ConfigSpeed(I2Cx, rcc_clocks.PCLK1_Frequency, I2C_InitStruct->ClockSpeed, I2C_InitStruct->DutyCycle);
155 
  LL_I2C_ConfigSpeed(I2Cx, rcc_clocks.PCLK1_Frequency, I2C_InitStruct->ClockSpeed, I2C_InitStruct->DutyCycle);
 155 
 
156 
 
 156 
  /*---------------------------- I2Cx OAR1 Configuration -----------------------
157 
  /*---------------------------- I2Cx OAR1 Configuration -----------------------
 157 
   * Disable, Configure and Enable I2Cx device own address 1 with parameters :
158 
   * Disable, Configure and Enable I2Cx device own address 1 with parameters :
 158 
   * - OwnAddress1:  I2C_OAR1_ADD[9:8], I2C_OAR1_ADD[7:1] and I2C_OAR1_ADD0 bits
159 
   * - OwnAddress1:  I2C_OAR1_ADD[9:8], I2C_OAR1_ADD[7:1] and I2C_OAR1_ADD0 bits
 159 
   * - OwnAddrSize:  I2C_OAR1_ADDMODE bit
160 
   * - OwnAddrSize:  I2C_OAR1_ADDMODE bit
 160 
   */
161 
   */
 161 
  LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
162 
  LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
 162 
 
163 
 
 163 
  /*---------------------------- I2Cx MODE Configuration -----------------------
164 
  /*---------------------------- I2Cx MODE Configuration -----------------------
 164 
  * Configure I2Cx peripheral mode with parameter :
165 
  * Configure I2Cx peripheral mode with parameter :
 165 
   * - PeripheralMode: I2C_CR1_SMBUS, I2C_CR1_SMBTYPE and I2C_CR1_ENARP bits
166 
   * - PeripheralMode: I2C_CR1_SMBUS, I2C_CR1_SMBTYPE and I2C_CR1_ENARP bits
 166 
   */
167 
   */
 167 
  LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);
168 
  LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);
 168 
 
169 
 
 169 
  /* Enable the selected I2Cx Peripheral */
170 
  /* Enable the selected I2Cx Peripheral */
 170 
  LL_I2C_Enable(I2Cx);
171 
  LL_I2C_Enable(I2Cx);
 171 
 
172 
 
 172 
  /*---------------------------- I2Cx CR2 Configuration ------------------------
173 
  /*---------------------------- I2Cx CR2 Configuration ------------------------
 173 
   * Configure the ACKnowledge or Non ACKnowledge condition
174 
   * Configure the ACKnowledge or Non ACKnowledge condition
 174 
   * after the address receive match code or next received byte with parameter :
175 
   * after the address receive match code or next received byte with parameter :
 175 
   * - TypeAcknowledge: I2C_CR2_NACK bit
176 
   * - TypeAcknowledge: I2C_CR2_NACK bit
 176 
   */
177 
   */
 177 
  LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);
178 
  LL_I2C_AcknowledgeNextData(I2Cx, I2C_InitStruct->TypeAcknowledge);
 178 
 
179 
 
 179 
  return SUCCESS;
180 
  return SUCCESS;
 180 
}
181 
}
 181 
 
182 
 
 182 
/**
183 
/**
 183 
  * @brief  Set each @ref LL_I2C_InitTypeDef field to default value.
184 
  * @brief  Set each @ref LL_I2C_InitTypeDef field to default value.
 184 
  * @param  I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure.
185 
  * @param  I2C_InitStruct Pointer to a @ref LL_I2C_InitTypeDef structure.
 185 
  * @retval None
186 
  * @retval None
 186 
  */
187 
  */
 187 
void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct)
188 
void LL_I2C_StructInit(LL_I2C_InitTypeDef *I2C_InitStruct)
 188 
{
189 
{
 189 
  /* Set I2C_InitStruct fields to default values */
190 
  /* Set I2C_InitStruct fields to default values */
 190 
  I2C_InitStruct->PeripheralMode  = LL_I2C_MODE_I2C;
191 
  I2C_InitStruct->PeripheralMode  = LL_I2C_MODE_I2C;
 191 
  I2C_InitStruct->ClockSpeed      = 5000U;
192 
  I2C_InitStruct->ClockSpeed      = 5000U;
 192 
  I2C_InitStruct->DutyCycle       = LL_I2C_DUTYCYCLE_2;
193 
  I2C_InitStruct->DutyCycle       = LL_I2C_DUTYCYCLE_2;
 193 
  I2C_InitStruct->OwnAddress1     = 0U;
194 
  I2C_InitStruct->OwnAddress1     = 0U;
 194 
  I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
195 
  I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
 195 
  I2C_InitStruct->OwnAddrSize     = LL_I2C_OWNADDRESS1_7BIT;
196 
  I2C_InitStruct->OwnAddrSize     = LL_I2C_OWNADDRESS1_7BIT;
 196 
}
197 
}
 197 
 
198 
 
 198 
/**
199 
/**
 199 
  * @}
200 
  * @}
 200 
  */
201 
  */
 201 
 
202 
 
 202 
/**
203 
/**
 203 
  * @}
204 
  * @}
 204 
  */
205 
  */
 205 
 
206 
 
 206 
/**
207 
/**
 207 
  * @}
208 
  * @}
 208 
  */
209 
  */
 209 
 
210 
 
 210 
#endif /* I2C1 || I2C2 */
211 
#endif /* I2C1 || I2C2 */
 211 
 
212 
 
 212 
/**
213 
/**
 213 
  * @}
214 
  * @}
 214 
  */
215 
  */
 215 
 
216 
 
 216 
#endif /* USE_FULL_LL_DRIVER */
217 
#endif /* USE_FULL_LL_DRIVER */
 217 
 
218 
 
 - 
 
219 
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
 -