1 /**
2   ******************************************************************************
3   * @file    stm32wbxx_ll_i2c.c
4   * @author  MCD Application Team
5   * @brief   I2C LL module driver.
6   ******************************************************************************
7   * @attention
8   *
9   * Copyright (c) 2019 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 "stm32wbxx_ll_i2c.h"
22 #include "stm32wbxx_ll_bus.h"
23 #ifdef  USE_FULL_ASSERT
24 #include "stm32_assert.h"
25 #else
26 #define assert_param(expr) ((void)0U)
27 #endif /* USE_FULL_ASSERT */
28 
29 /** @addtogroup STM32WBxx_LL_Driver
30   * @{
31   */
32 
33 #if defined (I2C1) || defined (I2C3)
34 
35 /** @defgroup I2C_LL I2C
36   * @{
37   */
38 
39 /* Private types -------------------------------------------------------------*/
40 /* Private variables ---------------------------------------------------------*/
41 /* Private constants ---------------------------------------------------------*/
42 /* Private macros ------------------------------------------------------------*/
43 /** @addtogroup I2C_LL_Private_Macros
44   * @{
45   */
46 
47 #define IS_LL_I2C_PERIPHERAL_MODE(__VALUE__)    (((__VALUE__) == LL_I2C_MODE_I2C)          || \
48                                                  ((__VALUE__) == LL_I2C_MODE_SMBUS_HOST)   || \
49                                                  ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE) || \
50                                                  ((__VALUE__) == LL_I2C_MODE_SMBUS_DEVICE_ARP))
51 
52 #define IS_LL_I2C_ANALOG_FILTER(__VALUE__)      (((__VALUE__) == LL_I2C_ANALOGFILTER_ENABLE) || \
53                                                  ((__VALUE__) == LL_I2C_ANALOGFILTER_DISABLE))
54 
55 #define IS_LL_I2C_DIGITAL_FILTER(__VALUE__)     ((__VALUE__) <= 0x0000000FU)
56 
57 #define IS_LL_I2C_OWN_ADDRESS1(__VALUE__)       ((__VALUE__) <= 0x000003FFU)
58 
59 #define IS_LL_I2C_TYPE_ACKNOWLEDGE(__VALUE__)   (((__VALUE__) == LL_I2C_ACK) || \
60                                                  ((__VALUE__) == LL_I2C_NACK))
61 
62 #define IS_LL_I2C_OWN_ADDRSIZE(__VALUE__)       (((__VALUE__) == LL_I2C_OWNADDRESS1_7BIT) || \
63                                                  ((__VALUE__) == LL_I2C_OWNADDRESS1_10BIT))
64 /**
65   * @}
66   */
67 
68 /* Private function prototypes -----------------------------------------------*/
69 
70 /* Exported functions --------------------------------------------------------*/
71 /** @addtogroup I2C_LL_Exported_Functions
72   * @{
73   */
74 
75 /** @addtogroup I2C_LL_EF_Init
76   * @{
77   */
78 
79 /**
80   * @brief  De-initialize the I2C registers to their default reset values.
81   * @param  I2Cx I2C Instance.
82   * @retval An ErrorStatus enumeration value:
83   *          - SUCCESS: I2C registers are de-initialized
84   *          - ERROR: I2C registers are not de-initialized
85   */
LL_I2C_DeInit(const I2C_TypeDef * I2Cx)86 ErrorStatus LL_I2C_DeInit(const I2C_TypeDef *I2Cx)
87 {
88   ErrorStatus status = SUCCESS;
89 
90   /* Check the I2C Instance I2Cx */
91   assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
92 
93   if (I2Cx == I2C1)
94   {
95     /* Force reset of I2C clock */
96     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C1);
97 
98     /* Release reset of I2C clock */
99     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C1);
100   }
101 #if defined(I2C3)
102   else if (I2Cx == I2C3)
103   {
104     /* Force reset of I2C clock */
105     LL_APB1_GRP1_ForceReset(LL_APB1_GRP1_PERIPH_I2C3);
106 
107     /* Release reset of I2C clock */
108     LL_APB1_GRP1_ReleaseReset(LL_APB1_GRP1_PERIPH_I2C3);
109   }
110 #endif /* I2C3 */
111   else
112   {
113     status = ERROR;
114   }
115 
116   return status;
117 }
118 
119 /**
120   * @brief  Initialize the I2C registers according to the specified parameters in I2C_InitStruct.
121   * @param  I2Cx I2C Instance.
122   * @param  I2C_InitStruct pointer to a @ref LL_I2C_InitTypeDef structure.
123   * @retval An ErrorStatus enumeration value:
124   *          - SUCCESS: I2C registers are initialized
125   *          - ERROR: Not applicable
126   */
LL_I2C_Init(I2C_TypeDef * I2Cx,const LL_I2C_InitTypeDef * I2C_InitStruct)127 ErrorStatus LL_I2C_Init(I2C_TypeDef *I2Cx, const LL_I2C_InitTypeDef *I2C_InitStruct)
128 {
129   /* Check the I2C Instance I2Cx */
130   assert_param(IS_I2C_ALL_INSTANCE(I2Cx));
131 
132   /* Check the I2C parameters from I2C_InitStruct */
133   assert_param(IS_LL_I2C_PERIPHERAL_MODE(I2C_InitStruct->PeripheralMode));
134   assert_param(IS_LL_I2C_ANALOG_FILTER(I2C_InitStruct->AnalogFilter));
135   assert_param(IS_LL_I2C_DIGITAL_FILTER(I2C_InitStruct->DigitalFilter));
136   assert_param(IS_LL_I2C_OWN_ADDRESS1(I2C_InitStruct->OwnAddress1));
137   assert_param(IS_LL_I2C_TYPE_ACKNOWLEDGE(I2C_InitStruct->TypeAcknowledge));
138   assert_param(IS_LL_I2C_OWN_ADDRSIZE(I2C_InitStruct->OwnAddrSize));
139 
140   /* Disable the selected I2Cx Peripheral */
141   LL_I2C_Disable(I2Cx);
142 
143   /*---------------------------- I2Cx CR1 Configuration ------------------------
144    * Configure the analog and digital noise filters with parameters :
145    * - AnalogFilter: I2C_CR1_ANFOFF bit
146    * - DigitalFilter: I2C_CR1_DNF[3:0] bits
147    */
148   LL_I2C_ConfigFilters(I2Cx, I2C_InitStruct->AnalogFilter, I2C_InitStruct->DigitalFilter);
149 
150   /*---------------------------- I2Cx TIMINGR Configuration --------------------
151    * Configure the SDA setup, hold time and the SCL high, low period with parameter :
152    * - Timing: I2C_TIMINGR_PRESC[3:0], I2C_TIMINGR_SCLDEL[3:0], I2C_TIMINGR_SDADEL[3:0],
153    *           I2C_TIMINGR_SCLH[7:0] and I2C_TIMINGR_SCLL[7:0] bits
154    */
155   LL_I2C_SetTiming(I2Cx, I2C_InitStruct->Timing);
156 
157   /* Enable the selected I2Cx Peripheral */
158   LL_I2C_Enable(I2Cx);
159 
160   /*---------------------------- I2Cx OAR1 Configuration -----------------------
161    * Disable, Configure and Enable I2Cx device own address 1 with parameters :
162    * - OwnAddress1:  I2C_OAR1_OA1[9:0] bits
163    * - OwnAddrSize:  I2C_OAR1_OA1MODE bit
164    */
165   LL_I2C_DisableOwnAddress1(I2Cx);
166   LL_I2C_SetOwnAddress1(I2Cx, I2C_InitStruct->OwnAddress1, I2C_InitStruct->OwnAddrSize);
167 
168   /* OwnAdress1 == 0 is reserved for General Call address */
169   if (I2C_InitStruct->OwnAddress1 != 0U)
170   {
171     LL_I2C_EnableOwnAddress1(I2Cx);
172   }
173 
174   /*---------------------------- I2Cx MODE Configuration -----------------------
175   * Configure I2Cx peripheral mode with parameter :
176    * - PeripheralMode: I2C_CR1_SMBDEN and I2C_CR1_SMBHEN bits
177    */
178   LL_I2C_SetMode(I2Cx, I2C_InitStruct->PeripheralMode);
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->Timing          = 0U;
200   I2C_InitStruct->AnalogFilter    = LL_I2C_ANALOGFILTER_ENABLE;
201   I2C_InitStruct->DigitalFilter   = 0U;
202   I2C_InitStruct->OwnAddress1     = 0U;
203   I2C_InitStruct->TypeAcknowledge = LL_I2C_NACK;
204   I2C_InitStruct->OwnAddrSize     = LL_I2C_OWNADDRESS1_7BIT;
205 }
206 
207 /**
208   * @}
209   */
210 
211 /**
212   * @}
213   */
214 
215 /**
216   * @}
217   */
218 
219 #endif /* I2C1 || I2C3 */
220 
221 /**
222   * @}
223   */
224 
225 #endif /* USE_FULL_LL_DRIVER */
226