1 /**
2 ******************************************************************************
3 * @file stm32l4xx_ll_exti.c
4 * @author MCD Application Team
5 * @brief EXTI LL module driver.
6 ******************************************************************************
7 * @attention
8 *
9 * <h2><center>© Copyright (c) 2017 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 "stm32l4xx_ll_exti.h"
23 #ifdef USE_FULL_ASSERT
24 #include "stm32_assert.h"
25 #else
26 #define assert_param(expr) ((void)0U)
27 #endif
28
29 /** @addtogroup STM32L4xx_LL_Driver
30 * @{
31 */
32
33 #if defined (EXTI)
34
35 /** @defgroup EXTI_LL EXTI
36 * @{
37 */
38
39 /* Private types -------------------------------------------------------------*/
40 /* Private variables ---------------------------------------------------------*/
41 /* Private constants ---------------------------------------------------------*/
42 /* Private macros ------------------------------------------------------------*/
43 /** @addtogroup EXTI_LL_Private_Macros
44 * @{
45 */
46
47 #define IS_LL_EXTI_LINE_0_31(__VALUE__) (((__VALUE__) & ~LL_EXTI_LINE_ALL_0_31) == 0x00000000U)
48 #define IS_LL_EXTI_LINE_32_63(__VALUE__) (((__VALUE__) & ~LL_EXTI_LINE_ALL_32_63) == 0x00000000U)
49
50 #define IS_LL_EXTI_MODE(__VALUE__) (((__VALUE__) == LL_EXTI_MODE_IT) \
51 || ((__VALUE__) == LL_EXTI_MODE_EVENT) \
52 || ((__VALUE__) == LL_EXTI_MODE_IT_EVENT))
53
54
55 #define IS_LL_EXTI_TRIGGER(__VALUE__) (((__VALUE__) == LL_EXTI_TRIGGER_NONE) \
56 || ((__VALUE__) == LL_EXTI_TRIGGER_RISING) \
57 || ((__VALUE__) == LL_EXTI_TRIGGER_FALLING) \
58 || ((__VALUE__) == LL_EXTI_TRIGGER_RISING_FALLING))
59
60 /**
61 * @}
62 */
63
64 /* Private function prototypes -----------------------------------------------*/
65
66 /* Exported functions --------------------------------------------------------*/
67 /** @addtogroup EXTI_LL_Exported_Functions
68 * @{
69 */
70
71 /** @addtogroup EXTI_LL_EF_Init
72 * @{
73 */
74
75 /**
76 * @brief De-initialize the EXTI registers to their default reset values.
77 * @retval An ErrorStatus enumeration value:
78 * - 0x00: EXTI registers are de-initialized
79 */
LL_EXTI_DeInit(void)80 uint32_t LL_EXTI_DeInit(void)
81 {
82 /* Interrupt mask register set to default reset values */
83 LL_EXTI_WriteReg(IMR1, 0xFF820000U);
84 /* Event mask register set to default reset values */
85 LL_EXTI_WriteReg(EMR1, 0x00000000U);
86 /* Rising Trigger selection register set to default reset values */
87 LL_EXTI_WriteReg(RTSR1, 0x00000000U);
88 /* Falling Trigger selection register set to default reset values */
89 LL_EXTI_WriteReg(FTSR1, 0x00000000U);
90 /* Software interrupt event register set to default reset values */
91 LL_EXTI_WriteReg(SWIER1, 0x00000000U);
92 /* Pending register clear */
93 LL_EXTI_WriteReg(PR1, 0x007DFFFFU);
94
95 /* Interrupt mask register 2 set to default reset values */
96 #if defined(LL_EXTI_LINE_40)
97 LL_EXTI_WriteReg(IMR2, 0x00000187U);
98 #else
99 LL_EXTI_WriteReg(IMR2, 0x00000087U);
100 #endif
101 /* Event mask register 2 set to default reset values */
102 LL_EXTI_WriteReg(EMR2, 0x00000000U);
103 /* Rising Trigger selection register 2 set to default reset values */
104 LL_EXTI_WriteReg(RTSR2, 0x00000000U);
105 /* Falling Trigger selection register 2 set to default reset values */
106 LL_EXTI_WriteReg(FTSR2, 0x00000000U);
107 /* Software interrupt event register 2 set to default reset values */
108 LL_EXTI_WriteReg(SWIER2, 0x00000000U);
109 /* Pending register 2 clear */
110 LL_EXTI_WriteReg(PR2, 0x00000078U);
111
112 return 0x00u;
113 }
114
115 /**
116 * @brief Initialize the EXTI registers according to the specified parameters in EXTI_InitStruct.
117 * @param EXTI_InitStruct pointer to a @ref LL_EXTI_InitTypeDef structure.
118 * @retval An ErrorStatus enumeration value:
119 * - 0x00: EXTI registers are initialized
120 * - any other calue : wrong configuration
121 */
LL_EXTI_Init(LL_EXTI_InitTypeDef * EXTI_InitStruct)122 uint32_t LL_EXTI_Init(LL_EXTI_InitTypeDef *EXTI_InitStruct)
123 {
124 uint32_t status = 0x00u;
125
126 /* Check the parameters */
127 assert_param(IS_LL_EXTI_LINE_0_31(EXTI_InitStruct->Line_0_31));
128 assert_param(IS_LL_EXTI_LINE_32_63(EXTI_InitStruct->Line_32_63));
129 assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->LineCommand));
130 assert_param(IS_LL_EXTI_MODE(EXTI_InitStruct->Mode));
131
132 /* ENABLE LineCommand */
133 if (EXTI_InitStruct->LineCommand != DISABLE)
134 {
135 assert_param(IS_LL_EXTI_TRIGGER(EXTI_InitStruct->Trigger));
136
137 /* Configure EXTI Lines in range from 0 to 31 */
138 if (EXTI_InitStruct->Line_0_31 != LL_EXTI_LINE_NONE)
139 {
140 switch (EXTI_InitStruct->Mode)
141 {
142 case LL_EXTI_MODE_IT:
143 /* First Disable Event on provided Lines */
144 LL_EXTI_DisableEvent_0_31(EXTI_InitStruct->Line_0_31);
145 /* Then Enable IT on provided Lines */
146 LL_EXTI_EnableIT_0_31(EXTI_InitStruct->Line_0_31);
147 break;
148 case LL_EXTI_MODE_EVENT:
149 /* First Disable IT on provided Lines */
150 LL_EXTI_DisableIT_0_31(EXTI_InitStruct->Line_0_31);
151 /* Then Enable Event on provided Lines */
152 LL_EXTI_EnableEvent_0_31(EXTI_InitStruct->Line_0_31);
153 break;
154 case LL_EXTI_MODE_IT_EVENT:
155 /* Directly Enable IT & Event on provided Lines */
156 LL_EXTI_EnableIT_0_31(EXTI_InitStruct->Line_0_31);
157 LL_EXTI_EnableEvent_0_31(EXTI_InitStruct->Line_0_31);
158 break;
159 default:
160 status = 0x01u;
161 break;
162 }
163 if (EXTI_InitStruct->Trigger != LL_EXTI_TRIGGER_NONE)
164 {
165 switch (EXTI_InitStruct->Trigger)
166 {
167 case LL_EXTI_TRIGGER_RISING:
168 /* First Disable Falling Trigger on provided Lines */
169 LL_EXTI_DisableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
170 /* Then Enable Rising Trigger on provided Lines */
171 LL_EXTI_EnableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
172 break;
173 case LL_EXTI_TRIGGER_FALLING:
174 /* First Disable Rising Trigger on provided Lines */
175 LL_EXTI_DisableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
176 /* Then Enable Falling Trigger on provided Lines */
177 LL_EXTI_EnableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
178 break;
179 case LL_EXTI_TRIGGER_RISING_FALLING:
180 LL_EXTI_EnableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
181 LL_EXTI_EnableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
182 break;
183 default:
184 status |= 0x02u;
185 break;
186 }
187 }
188 }
189 /* Configure EXTI Lines in range from 32 to 63 */
190 if (EXTI_InitStruct->Line_32_63 != LL_EXTI_LINE_NONE)
191 {
192 switch (EXTI_InitStruct->Mode)
193 {
194 case LL_EXTI_MODE_IT:
195 /* First Disable Event on provided Lines */
196 LL_EXTI_DisableEvent_32_63(EXTI_InitStruct->Line_32_63);
197 /* Then Enable IT on provided Lines */
198 LL_EXTI_EnableIT_32_63(EXTI_InitStruct->Line_32_63);
199 break;
200 case LL_EXTI_MODE_EVENT:
201 /* First Disable IT on provided Lines */
202 LL_EXTI_DisableIT_32_63(EXTI_InitStruct->Line_32_63);
203 /* Then Enable Event on provided Lines */
204 LL_EXTI_EnableEvent_32_63(EXTI_InitStruct->Line_32_63);
205 break;
206 case LL_EXTI_MODE_IT_EVENT:
207 /* Directly Enable IT & Event on provided Lines */
208 LL_EXTI_EnableIT_32_63(EXTI_InitStruct->Line_32_63);
209 LL_EXTI_EnableEvent_32_63(EXTI_InitStruct->Line_32_63);
210 break;
211 default:
212 status |= 0x04u;
213 break;
214 }
215 if (EXTI_InitStruct->Trigger != LL_EXTI_TRIGGER_NONE)
216 {
217 switch (EXTI_InitStruct->Trigger)
218 {
219 case LL_EXTI_TRIGGER_RISING:
220 /* First Disable Falling Trigger on provided Lines */
221 LL_EXTI_DisableFallingTrig_32_63(EXTI_InitStruct->Line_32_63);
222 /* Then Enable IT on provided Lines */
223 LL_EXTI_EnableRisingTrig_32_63(EXTI_InitStruct->Line_32_63);
224 break;
225 case LL_EXTI_TRIGGER_FALLING:
226 /* First Disable Rising Trigger on provided Lines */
227 LL_EXTI_DisableRisingTrig_32_63(EXTI_InitStruct->Line_32_63);
228 /* Then Enable Falling Trigger on provided Lines */
229 LL_EXTI_EnableFallingTrig_32_63(EXTI_InitStruct->Line_32_63);
230 break;
231 case LL_EXTI_TRIGGER_RISING_FALLING:
232 LL_EXTI_EnableRisingTrig_32_63(EXTI_InitStruct->Line_32_63);
233 LL_EXTI_EnableFallingTrig_32_63(EXTI_InitStruct->Line_32_63);
234 break;
235 default:
236 status = ERROR;
237 break;
238 }
239 }
240 }
241 }
242 /* DISABLE LineCommand */
243 else
244 {
245 /* De-configure EXTI Lines in range from 0 to 31 */
246 LL_EXTI_DisableIT_0_31(EXTI_InitStruct->Line_0_31);
247 LL_EXTI_DisableEvent_0_31(EXTI_InitStruct->Line_0_31);
248 /* De-configure EXTI Lines in range from 32 to 63 */
249 LL_EXTI_DisableIT_32_63(EXTI_InitStruct->Line_32_63);
250 LL_EXTI_DisableEvent_32_63(EXTI_InitStruct->Line_32_63);
251 }
252
253 return status;
254 }
255
256 /**
257 * @brief Set each @ref LL_EXTI_InitTypeDef field to default value.
258 * @param EXTI_InitStruct Pointer to a @ref LL_EXTI_InitTypeDef structure.
259 * @retval None
260 */
LL_EXTI_StructInit(LL_EXTI_InitTypeDef * EXTI_InitStruct)261 void LL_EXTI_StructInit(LL_EXTI_InitTypeDef *EXTI_InitStruct)
262 {
263 EXTI_InitStruct->Line_0_31 = LL_EXTI_LINE_NONE;
264 EXTI_InitStruct->Line_32_63 = LL_EXTI_LINE_NONE;
265 EXTI_InitStruct->LineCommand = DISABLE;
266 EXTI_InitStruct->Mode = LL_EXTI_MODE_IT;
267 EXTI_InitStruct->Trigger = LL_EXTI_TRIGGER_FALLING;
268 }
269
270 /**
271 * @}
272 */
273
274 /**
275 * @}
276 */
277
278 /**
279 * @}
280 */
281
282 #endif /* defined (EXTI) */
283
284 /**
285 * @}
286 */
287
288 #endif /* USE_FULL_LL_DRIVER */
289
290 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
291