1 /**
2   ******************************************************************************
3   * @file    stm32f3xx_ll_exti.c
4   * @author  MCD Application Team
5   * @brief   EXTI LL module driver.
6   ******************************************************************************
7   * @attention
8   *
9   * Copyright (c) 2016 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 "stm32f3xx_ll_exti.h"
22 #ifdef  USE_FULL_ASSERT
23 #include "stm32_assert.h"
24 #else
25 #define assert_param(expr) ((void)0U)
26 #endif
27 
28 /** @addtogroup STM32F3xx_LL_Driver
29   * @{
30   */
31 
32 #if defined (EXTI)
33 
34 /** @defgroup EXTI_LL EXTI
35   * @{
36   */
37 
38 /* Private types -------------------------------------------------------------*/
39 /* Private variables ---------------------------------------------------------*/
40 /* Private constants ---------------------------------------------------------*/
41 /* Private macros ------------------------------------------------------------*/
42 /** @addtogroup EXTI_LL_Private_Macros
43   * @{
44   */
45 
46 #define IS_LL_EXTI_LINE_0_31(__VALUE__)              (((__VALUE__) & ~LL_EXTI_LINE_ALL_0_31) == 0x00000000U)
47 #if defined(EXTI_32_63_SUPPORT)
48 #define IS_LL_EXTI_LINE_32_63(__VALUE__)             (((__VALUE__) & ~LL_EXTI_LINE_ALL_32_63) == 0x00000000U)
49 #endif
50 
51 #define IS_LL_EXTI_MODE(__VALUE__)                   (((__VALUE__) == LL_EXTI_MODE_IT)            \
52                                                    || ((__VALUE__) == LL_EXTI_MODE_EVENT)         \
53                                                    || ((__VALUE__) == LL_EXTI_MODE_IT_EVENT))
54 
55 
56 #define IS_LL_EXTI_TRIGGER(__VALUE__)                (((__VALUE__) == LL_EXTI_TRIGGER_NONE)       \
57                                                    || ((__VALUE__) == LL_EXTI_TRIGGER_RISING)     \
58                                                    || ((__VALUE__) == LL_EXTI_TRIGGER_FALLING)    \
59                                                    || ((__VALUE__) == LL_EXTI_TRIGGER_RISING_FALLING))
60 
61 /**
62   * @}
63   */
64 
65 /* Private function prototypes -----------------------------------------------*/
66 
67 /* Exported functions --------------------------------------------------------*/
68 /** @addtogroup EXTI_LL_Exported_Functions
69   * @{
70   */
71 
72 /** @addtogroup EXTI_LL_EF_Init
73   * @{
74   */
75 
76 /**
77   * @brief  De-initialize the EXTI registers to their default reset values.
78   * @retval An ErrorStatus enumeration value:
79   *          - SUCCESS: EXTI registers are de-initialized
80   *          - ERROR: not applicable
81   */
LL_EXTI_DeInit(void)82 uint32_t LL_EXTI_DeInit(void)
83 {
84   /* Interrupt mask register set to default reset values */
85   LL_EXTI_WriteReg(IMR,   0x1F800000U);
86   /* Event mask register set to default reset values */
87   LL_EXTI_WriteReg(EMR,   0x00000000U);
88   /* Rising Trigger selection register set to default reset values */
89   LL_EXTI_WriteReg(RTSR,  0x00000000U);
90   /* Falling Trigger selection register set to default reset values */
91   LL_EXTI_WriteReg(FTSR,  0x00000000U);
92   /* Software interrupt event register set to default reset values */
93   LL_EXTI_WriteReg(SWIER, 0x00000000U);
94   /* Pending register clear */
95   LL_EXTI_WriteReg(PR,    0x007FFFFFU);
96 
97 #if defined(EXTI_32_63_SUPPORT)
98   /* Interrupt mask register 2 set to default reset values */
99 #if defined(STM32F334x8)
100   LL_EXTI_WriteReg(IMR2,        0xFFFFFFFEU);
101 #else
102   LL_EXTI_WriteReg(IMR2,        0xFFFFFFFCU);
103 #endif
104   /* Event mask register 2 set to default reset values */
105   LL_EXTI_WriteReg(EMR2,        0x00000000U);
106   /* Rising Trigger selection register 2 set to default reset values */
107   LL_EXTI_WriteReg(RTSR2,       0x00000000U);
108   /* Falling Trigger selection register 2 set to default reset values */
109   LL_EXTI_WriteReg(FTSR2,       0x00000000U);
110   /* Software interrupt event register 2 set to default reset values */
111   LL_EXTI_WriteReg(SWIER2,      0x00000000U);
112   /* Pending register 2 clear */
113   LL_EXTI_WriteReg(PR2,         0x00000003U);
114 
115 #endif
116   return SUCCESS;
117 }
118 
119 /**
120   * @brief  Initialize the EXTI registers according to the specified parameters in EXTI_InitStruct.
121   * @param  EXTI_InitStruct pointer to a @ref LL_EXTI_InitTypeDef structure.
122   * @retval An ErrorStatus enumeration value:
123   *          - SUCCESS: EXTI registers are initialized
124   *          - ERROR: not applicable
125   */
LL_EXTI_Init(LL_EXTI_InitTypeDef * EXTI_InitStruct)126 uint32_t LL_EXTI_Init(LL_EXTI_InitTypeDef *EXTI_InitStruct)
127 {
128   ErrorStatus status = SUCCESS;
129   /* Check the parameters */
130   assert_param(IS_LL_EXTI_LINE_0_31(EXTI_InitStruct->Line_0_31));
131 #if defined(EXTI_32_63_SUPPORT)
132   assert_param(IS_LL_EXTI_LINE_32_63(EXTI_InitStruct->Line_32_63));
133 #endif
134   assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->LineCommand));
135   assert_param(IS_LL_EXTI_MODE(EXTI_InitStruct->Mode));
136 
137   /* ENABLE LineCommand */
138   if (EXTI_InitStruct->LineCommand != DISABLE)
139   {
140     assert_param(IS_LL_EXTI_TRIGGER(EXTI_InitStruct->Trigger));
141 
142     /* Configure EXTI Lines in range from 0 to 31 */
143     if (EXTI_InitStruct->Line_0_31 != LL_EXTI_LINE_NONE)
144     {
145       switch (EXTI_InitStruct->Mode)
146       {
147         case LL_EXTI_MODE_IT:
148           /* First Disable Event on provided Lines */
149           LL_EXTI_DisableEvent_0_31(EXTI_InitStruct->Line_0_31);
150           /* Then Enable IT on provided Lines */
151           LL_EXTI_EnableIT_0_31(EXTI_InitStruct->Line_0_31);
152           break;
153         case LL_EXTI_MODE_EVENT:
154           /* First Disable IT on provided Lines */
155           LL_EXTI_DisableIT_0_31(EXTI_InitStruct->Line_0_31);
156           /* Then Enable Event on provided Lines */
157           LL_EXTI_EnableEvent_0_31(EXTI_InitStruct->Line_0_31);
158           break;
159         case LL_EXTI_MODE_IT_EVENT:
160           /* Directly Enable IT & Event on provided Lines */
161           LL_EXTI_EnableIT_0_31(EXTI_InitStruct->Line_0_31);
162           LL_EXTI_EnableEvent_0_31(EXTI_InitStruct->Line_0_31);
163           break;
164         default:
165           status = ERROR;
166           break;
167       }
168       if (EXTI_InitStruct->Trigger != LL_EXTI_TRIGGER_NONE)
169       {
170         switch (EXTI_InitStruct->Trigger)
171         {
172           case LL_EXTI_TRIGGER_RISING:
173             /* First Disable Falling Trigger on provided Lines */
174             LL_EXTI_DisableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
175             /* Then Enable Rising Trigger on provided Lines */
176             LL_EXTI_EnableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
177             break;
178           case LL_EXTI_TRIGGER_FALLING:
179             /* First Disable Rising Trigger on provided Lines */
180             LL_EXTI_DisableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
181             /* Then Enable Falling Trigger on provided Lines */
182             LL_EXTI_EnableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
183             break;
184           case LL_EXTI_TRIGGER_RISING_FALLING:
185             LL_EXTI_EnableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
186             LL_EXTI_EnableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
187             break;
188           default:
189             status = ERROR;
190             break;
191         }
192       }
193     }
194 #if defined(EXTI_32_63_SUPPORT)
195     /* Configure EXTI Lines in range from 32 to 63 */
196     if (EXTI_InitStruct->Line_32_63 != LL_EXTI_LINE_NONE)
197     {
198       switch (EXTI_InitStruct->Mode)
199       {
200         case LL_EXTI_MODE_IT:
201           /* First Disable Event on provided Lines */
202           LL_EXTI_DisableEvent_32_63(EXTI_InitStruct->Line_32_63);
203           /* Then Enable IT on provided Lines */
204           LL_EXTI_EnableIT_32_63(EXTI_InitStruct->Line_32_63);
205           break;
206         case LL_EXTI_MODE_EVENT:
207           /* First Disable IT on provided Lines */
208           LL_EXTI_DisableIT_32_63(EXTI_InitStruct->Line_32_63);
209           /* Then Enable Event on provided Lines */
210           LL_EXTI_EnableEvent_32_63(EXTI_InitStruct->Line_32_63);
211           break;
212         case LL_EXTI_MODE_IT_EVENT:
213           /* Directly Enable IT & Event on provided Lines */
214           LL_EXTI_EnableIT_32_63(EXTI_InitStruct->Line_32_63);
215           LL_EXTI_EnableEvent_32_63(EXTI_InitStruct->Line_32_63);
216           break;
217         default:
218           status = ERROR;
219           break;
220       }
221       if (EXTI_InitStruct->Trigger != LL_EXTI_TRIGGER_NONE)
222       {
223         switch (EXTI_InitStruct->Trigger)
224         {
225           case LL_EXTI_TRIGGER_RISING:
226             /* First Disable Falling Trigger on provided Lines */
227             LL_EXTI_DisableFallingTrig_32_63(EXTI_InitStruct->Line_32_63);
228             /* Then Enable IT on provided Lines */
229             LL_EXTI_EnableRisingTrig_32_63(EXTI_InitStruct->Line_32_63);
230             break;
231           case LL_EXTI_TRIGGER_FALLING:
232             /* First Disable Rising Trigger on provided Lines */
233             LL_EXTI_DisableRisingTrig_32_63(EXTI_InitStruct->Line_32_63);
234             /* Then Enable Falling Trigger on provided Lines */
235             LL_EXTI_EnableFallingTrig_32_63(EXTI_InitStruct->Line_32_63);
236             break;
237           case LL_EXTI_TRIGGER_RISING_FALLING:
238             LL_EXTI_EnableRisingTrig_32_63(EXTI_InitStruct->Line_32_63);
239             LL_EXTI_EnableFallingTrig_32_63(EXTI_InitStruct->Line_32_63);
240             break;
241           default:
242             status = ERROR;
243             break;
244         }
245       }
246     }
247 #endif
248   }
249   /* DISABLE LineCommand */
250   else
251   {
252     /* De-configure EXTI Lines in range from 0 to 31 */
253     LL_EXTI_DisableIT_0_31(EXTI_InitStruct->Line_0_31);
254     LL_EXTI_DisableEvent_0_31(EXTI_InitStruct->Line_0_31);
255 #if defined(EXTI_32_63_SUPPORT)
256     /* De-configure EXTI Lines in range from 32 to 63 */
257     LL_EXTI_DisableIT_32_63(EXTI_InitStruct->Line_32_63);
258     LL_EXTI_DisableEvent_32_63(EXTI_InitStruct->Line_32_63);
259 #endif
260   }
261   return status;
262 }
263 
264 /**
265   * @brief  Set each @ref LL_EXTI_InitTypeDef field to default value.
266   * @param  EXTI_InitStruct Pointer to a @ref LL_EXTI_InitTypeDef structure.
267   * @retval None
268   */
LL_EXTI_StructInit(LL_EXTI_InitTypeDef * EXTI_InitStruct)269 void LL_EXTI_StructInit(LL_EXTI_InitTypeDef *EXTI_InitStruct)
270 {
271   EXTI_InitStruct->Line_0_31      = LL_EXTI_LINE_NONE;
272 #if defined(EXTI_32_63_SUPPORT)
273   EXTI_InitStruct->Line_32_63     = LL_EXTI_LINE_NONE;
274 #endif
275   EXTI_InitStruct->LineCommand    = DISABLE;
276   EXTI_InitStruct->Mode           = LL_EXTI_MODE_IT;
277   EXTI_InitStruct->Trigger        = LL_EXTI_TRIGGER_FALLING;
278 }
279 
280 /**
281   * @}
282   */
283 
284 /**
285   * @}
286   */
287 
288 /**
289   * @}
290   */
291 
292 #endif /* defined (EXTI) */
293 
294 /**
295   * @}
296   */
297 
298 #endif /* USE_FULL_LL_DRIVER */
299 
300