Outline ![]()
Files ![]()
loading...
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
/**
******************************************************************************
* @file stm32f4xx_hal_i2c_ex.c
* @author MCD Application Team
* @brief I2C Extension HAL module driver.
* This file provides firmware functions to manage the following
* functionalities of I2C extension peripheral:
* + Extension features functions
*
******************************************************************************
* @attention
*
* Copyright (c) 2016 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
@verbatim
==============================================================================
##### I2C peripheral extension features #####
==============================================================================
[..] Comparing to other previous devices, the I2C interface for STM32F427xx/437xx/
429xx/439xx devices contains the following additional features :
(+) Possibility to disable or enable Analog Noise Filter
(+) Use of a configured Digital Noise Filter
##### How to use this driver #####
==============================================================================
[..] This driver provides functions to configure Noise Filter
(#) Configure I2C Analog noise filter using the function HAL_I2C_AnalogFilter_Config()
(#) Configure I2C Digital noise filter using the function HAL_I2C_DigitalFilter_Config()
@endverbatim
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"
/** @addtogroup STM32F4xx_HAL_Driver
* @{
*/
/** @defgroup I2CEx I2CEx
* @brief I2C HAL module driver
* @{
*/
#ifdef HAL_I2C_MODULE_ENABLED
#if defined(I2C_FLTR_ANOFF)&&defined(I2C_FLTR_DNF)
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Exported functions --------------------------------------------------------*/
/** @defgroup I2CEx_Exported_Functions I2C Exported Functions
* @{
*/
/** @defgroup I2CEx_Exported_Functions_Group1 Extension features functions
* @brief Extension features functions
*
@verbatim
===============================================================================
##### Extension features functions #####
===============================================================================
[..] This section provides functions allowing to:
(+) Configure Noise Filters
@endverbatim
* @{
*/
/**
* @brief Configures I2C Analog noise filter.
* @param hi2c pointer to a I2C_HandleTypeDef structure that contains
* the configuration information for the specified I2Cx peripheral.
* @param AnalogFilter new state of the Analog filter.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_I2CEx_ConfigAnalogFilter(I2C_HandleTypeDef *hi2c, uint32_t AnalogFilter)
{
/* Check the parameters */
assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance));
assert_param(IS_I2C_ANALOG_FILTER(AnalogFilter));
if (hi2c->State == HAL_I2C_STATE_READY)
{
hi2c->State = HAL_I2C_STATE_BUSY;
/* Disable the selected I2C peripheral */
__HAL_I2C_DISABLE(hi2c);
/* Reset I2Cx ANOFF bit */
hi2c->Instance->FLTR &= ~(I2C_FLTR_ANOFF);
/* Disable the analog filter */
hi2c->Instance->FLTR |= AnalogFilter;
__HAL_I2C_ENABLE(hi2c);
hi2c->State = HAL_I2C_STATE_READY;
return HAL_OK;
}
else
{
return HAL_BUSY;
}
}
/**
* @brief Configures I2C Digital noise filter.
* @param hi2c pointer to a I2C_HandleTypeDef structure that contains
* the configuration information for the specified I2Cx peripheral.
* @param DigitalFilter Coefficient of digital noise filter between 0x00 and 0x0F.
* @retval HAL status
*/
HAL_StatusTypeDef HAL_I2CEx_ConfigDigitalFilter(I2C_HandleTypeDef *hi2c, uint32_t DigitalFilter)
{
uint16_t tmpreg = 0;
/* Check the parameters */
assert_param(IS_I2C_ALL_INSTANCE(hi2c->Instance));
assert_param(IS_I2C_DIGITAL_FILTER(DigitalFilter));
if (hi2c->State == HAL_I2C_STATE_READY)
{
hi2c->State = HAL_I2C_STATE_BUSY;
/* Disable the selected I2C peripheral */
__HAL_I2C_DISABLE(hi2c);
/* Get the old register value */
tmpreg = hi2c->Instance->FLTR;
/* Reset I2Cx DNF bit [3:0] */
tmpreg &= ~(I2C_FLTR_DNF);
/* Set I2Cx DNF coefficient */
tmpreg |= DigitalFilter;
/* Store the new register value */
hi2c->Instance->FLTR = tmpreg;
__HAL_I2C_ENABLE(hi2c);
hi2c->State = HAL_I2C_STATE_READY;
return HAL_OK;
}
else
{
return HAL_BUSY;
}
}
/**
* @}
*/
/**
* @}
*/
#endif
#endif /* HAL_I2C_MODULE_ENABLED */
/**
* @}
*/
/**
* @}
*/