source: trunk/firmware/Drivers/STM32G0xx_HAL_Driver/Src/stm32g0xx_ll_i2c.c

Last change on this file was 6, checked in by f.jahn, 3 months ago
File size: 7.7 KB
Line 
1/**
2  ******************************************************************************
3  * @file    stm32g0xx_ll_i2c.c
4  * @author  MCD Application Team
5  * @brief   I2C LL module driver.
6  ******************************************************************************
7  * @attention
8  *
9  * <h2><center>&copy; Copyright (c) 2018 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 "stm32g0xx_ll_i2c.h"
23#include "stm32g0xx_ll_bus.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 STM32G0xx_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_ANALOG_FILTER(__VALUE__)      (((__VALUE__) == LL_I2C_ANALOGFILTER_ENABLE) || \
54                                                 ((__VALUE__) == LL_I2C_ANALOGFILTER_DISABLE))
55
56#define IS_LL_I2C_DIGITAL_FILTER(__VALUE__)     ((__VALUE__) <= 0x0000000FU)
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  */
87ErrorStatus 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
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  */
127ErrorStatus LL_I2C_Init(I2C_TypeDef *I2Cx, 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  */
195void 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 || I2C2 */
220
221/**
222  * @}
223  */
224
225#endif /* USE_FULL_LL_DRIVER */
226
227/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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