1 /**
2   ******************************************************************************
3   * @file    stm32l4xx_ll_exti.c
4   * @author  MCD Application Team
5   * @brief   EXTI LL module driver.
6   ******************************************************************************
7   * @attention
8   *
9   * Copyright (c) 2017 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 "stm32l4xx_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 STM32L4xx_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 #define IS_LL_EXTI_LINE_32_63(__VALUE__)             (((__VALUE__) & ~LL_EXTI_LINE_ALL_32_63) == 0x00000000U)
48 
49 #define IS_LL_EXTI_MODE(__VALUE__)                   (((__VALUE__) == LL_EXTI_MODE_IT)            \
50                                                    || ((__VALUE__) == LL_EXTI_MODE_EVENT)         \
51                                                    || ((__VALUE__) == LL_EXTI_MODE_IT_EVENT))
52 
53 
54 #define IS_LL_EXTI_TRIGGER(__VALUE__)                (((__VALUE__) == LL_EXTI_TRIGGER_NONE)       \
55                                                    || ((__VALUE__) == LL_EXTI_TRIGGER_RISING)     \
56                                                    || ((__VALUE__) == LL_EXTI_TRIGGER_FALLING)    \
57                                                    || ((__VALUE__) == LL_EXTI_TRIGGER_RISING_FALLING))
58 
59 /**
60   * @}
61   */
62 
63 /* Private function prototypes -----------------------------------------------*/
64 
65 /* Exported functions --------------------------------------------------------*/
66 /** @addtogroup EXTI_LL_Exported_Functions
67   * @{
68   */
69 
70 /** @addtogroup EXTI_LL_EF_Init
71   * @{
72   */
73 
74 /**
75   * @brief  De-initialize the EXTI registers to their default reset values.
76   * @retval An ErrorStatus enumeration value:
77   *          - 0x00: EXTI registers are de-initialized
78   */
LL_EXTI_DeInit(void)79 uint32_t LL_EXTI_DeInit(void)
80 {
81   /* Interrupt mask register set to default reset values */
82   LL_EXTI_WriteReg(IMR1,   0xFF820000U);
83   /* Event mask register set to default reset values */
84   LL_EXTI_WriteReg(EMR1,   0x00000000U);
85   /* Rising Trigger selection register set to default reset values */
86   LL_EXTI_WriteReg(RTSR1,  0x00000000U);
87   /* Falling Trigger selection register set to default reset values */
88   LL_EXTI_WriteReg(FTSR1,  0x00000000U);
89   /* Software interrupt event register set to default reset values */
90   LL_EXTI_WriteReg(SWIER1, 0x00000000U);
91   /* Pending register clear */
92   LL_EXTI_WriteReg(PR1,    0x007DFFFFU);
93 
94   /* Interrupt mask register 2 set to default reset values */
95 #if defined(LL_EXTI_LINE_40)
96   LL_EXTI_WriteReg(IMR2,        0x00000187U);
97 #else
98   LL_EXTI_WriteReg(IMR2,        0x00000087U);
99 #endif
100   /* Event mask register 2 set to default reset values */
101   LL_EXTI_WriteReg(EMR2,        0x00000000U);
102   /* Rising Trigger selection register 2 set to default reset values */
103   LL_EXTI_WriteReg(RTSR2,       0x00000000U);
104   /* Falling Trigger selection register 2 set to default reset values */
105   LL_EXTI_WriteReg(FTSR2,       0x00000000U);
106   /* Software interrupt event register 2 set to default reset values */
107   LL_EXTI_WriteReg(SWIER2,      0x00000000U);
108   /* Pending register 2 clear */
109   LL_EXTI_WriteReg(PR2,         0x00000078U);
110 
111   return 0x00u;
112 }
113 
114 /**
115   * @brief  Initialize the EXTI registers according to the specified parameters in EXTI_InitStruct.
116   * @param  EXTI_InitStruct pointer to a @ref LL_EXTI_InitTypeDef structure.
117   * @retval An ErrorStatus enumeration value:
118   *          - 0x00: EXTI registers are initialized
119   *          - any other value : wrong configuration
120   */
LL_EXTI_Init(LL_EXTI_InitTypeDef * EXTI_InitStruct)121 uint32_t LL_EXTI_Init(LL_EXTI_InitTypeDef *EXTI_InitStruct)
122 {
123   uint32_t status = 0x00u;
124 
125   /* Check the parameters */
126   assert_param(IS_LL_EXTI_LINE_0_31(EXTI_InitStruct->Line_0_31));
127   assert_param(IS_LL_EXTI_LINE_32_63(EXTI_InitStruct->Line_32_63));
128   assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->LineCommand));
129   assert_param(IS_LL_EXTI_MODE(EXTI_InitStruct->Mode));
130 
131   /* ENABLE LineCommand */
132   if (EXTI_InitStruct->LineCommand != DISABLE)
133   {
134     assert_param(IS_LL_EXTI_TRIGGER(EXTI_InitStruct->Trigger));
135 
136     /* Configure EXTI Lines in range from 0 to 31 */
137     if (EXTI_InitStruct->Line_0_31 != LL_EXTI_LINE_NONE)
138     {
139       switch (EXTI_InitStruct->Mode)
140       {
141         case LL_EXTI_MODE_IT:
142           /* First Disable Event on provided Lines */
143           LL_EXTI_DisableEvent_0_31(EXTI_InitStruct->Line_0_31);
144           /* Then Enable IT on provided Lines */
145           LL_EXTI_EnableIT_0_31(EXTI_InitStruct->Line_0_31);
146           break;
147         case LL_EXTI_MODE_EVENT:
148           /* First Disable IT on provided Lines */
149           LL_EXTI_DisableIT_0_31(EXTI_InitStruct->Line_0_31);
150           /* Then Enable Event on provided Lines */
151           LL_EXTI_EnableEvent_0_31(EXTI_InitStruct->Line_0_31);
152           break;
153         case LL_EXTI_MODE_IT_EVENT:
154           /* Directly Enable IT & Event on provided Lines */
155           LL_EXTI_EnableIT_0_31(EXTI_InitStruct->Line_0_31);
156           LL_EXTI_EnableEvent_0_31(EXTI_InitStruct->Line_0_31);
157           break;
158         default:
159           status = 0x01u;
160           break;
161       }
162       if (EXTI_InitStruct->Trigger != LL_EXTI_TRIGGER_NONE)
163       {
164         switch (EXTI_InitStruct->Trigger)
165         {
166           case LL_EXTI_TRIGGER_RISING:
167             /* First Disable Falling Trigger on provided Lines */
168             LL_EXTI_DisableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
169             /* Then Enable Rising Trigger on provided Lines */
170             LL_EXTI_EnableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
171             break;
172           case LL_EXTI_TRIGGER_FALLING:
173             /* First Disable Rising Trigger on provided Lines */
174             LL_EXTI_DisableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
175             /* Then Enable Falling Trigger on provided Lines */
176             LL_EXTI_EnableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
177             break;
178           case LL_EXTI_TRIGGER_RISING_FALLING:
179             LL_EXTI_EnableRisingTrig_0_31(EXTI_InitStruct->Line_0_31);
180             LL_EXTI_EnableFallingTrig_0_31(EXTI_InitStruct->Line_0_31);
181             break;
182           default:
183             status |= 0x02u;
184             break;
185         }
186       }
187     }
188     /* Configure EXTI Lines in range from 32 to 63 */
189     if (EXTI_InitStruct->Line_32_63 != LL_EXTI_LINE_NONE)
190     {
191       switch (EXTI_InitStruct->Mode)
192       {
193         case LL_EXTI_MODE_IT:
194           /* First Disable Event on provided Lines */
195           LL_EXTI_DisableEvent_32_63(EXTI_InitStruct->Line_32_63);
196           /* Then Enable IT on provided Lines */
197           LL_EXTI_EnableIT_32_63(EXTI_InitStruct->Line_32_63);
198           break;
199         case LL_EXTI_MODE_EVENT:
200           /* First Disable IT on provided Lines */
201           LL_EXTI_DisableIT_32_63(EXTI_InitStruct->Line_32_63);
202           /* Then Enable Event on provided Lines */
203           LL_EXTI_EnableEvent_32_63(EXTI_InitStruct->Line_32_63);
204           break;
205         case LL_EXTI_MODE_IT_EVENT:
206           /* Directly Enable IT & Event on provided Lines */
207           LL_EXTI_EnableIT_32_63(EXTI_InitStruct->Line_32_63);
208           LL_EXTI_EnableEvent_32_63(EXTI_InitStruct->Line_32_63);
209           break;
210         default:
211           status |= 0x04u;
212           break;
213       }
214       if (EXTI_InitStruct->Trigger != LL_EXTI_TRIGGER_NONE)
215       {
216         switch (EXTI_InitStruct->Trigger)
217         {
218           case LL_EXTI_TRIGGER_RISING:
219             /* First Disable Falling Trigger on provided Lines */
220             LL_EXTI_DisableFallingTrig_32_63(EXTI_InitStruct->Line_32_63);
221             /* Then Enable IT on provided Lines */
222             LL_EXTI_EnableRisingTrig_32_63(EXTI_InitStruct->Line_32_63);
223             break;
224           case LL_EXTI_TRIGGER_FALLING:
225             /* First Disable Rising Trigger on provided Lines */
226             LL_EXTI_DisableRisingTrig_32_63(EXTI_InitStruct->Line_32_63);
227             /* Then Enable Falling Trigger on provided Lines */
228             LL_EXTI_EnableFallingTrig_32_63(EXTI_InitStruct->Line_32_63);
229             break;
230           case LL_EXTI_TRIGGER_RISING_FALLING:
231             LL_EXTI_EnableRisingTrig_32_63(EXTI_InitStruct->Line_32_63);
232             LL_EXTI_EnableFallingTrig_32_63(EXTI_InitStruct->Line_32_63);
233             break;
234           default:
235             status = ERROR;
236             break;
237         }
238       }
239     }
240   }
241   /* DISABLE LineCommand */
242   else
243   {
244     /* De-configure EXTI Lines in range from 0 to 31 */
245     LL_EXTI_DisableIT_0_31(EXTI_InitStruct->Line_0_31);
246     LL_EXTI_DisableEvent_0_31(EXTI_InitStruct->Line_0_31);
247     /* De-configure EXTI Lines in range from 32 to 63 */
248     LL_EXTI_DisableIT_32_63(EXTI_InitStruct->Line_32_63);
249     LL_EXTI_DisableEvent_32_63(EXTI_InitStruct->Line_32_63);
250   }
251 
252   return status;
253 }
254 
255 /**
256   * @brief  Set each @ref LL_EXTI_InitTypeDef field to default value.
257   * @param  EXTI_InitStruct Pointer to a @ref LL_EXTI_InitTypeDef structure.
258   * @retval None
259   */
LL_EXTI_StructInit(LL_EXTI_InitTypeDef * EXTI_InitStruct)260 void LL_EXTI_StructInit(LL_EXTI_InitTypeDef *EXTI_InitStruct)
261 {
262   EXTI_InitStruct->Line_0_31      = LL_EXTI_LINE_NONE;
263   EXTI_InitStruct->Line_32_63     = LL_EXTI_LINE_NONE;
264   EXTI_InitStruct->LineCommand    = DISABLE;
265   EXTI_InitStruct->Mode           = LL_EXTI_MODE_IT;
266   EXTI_InitStruct->Trigger        = LL_EXTI_TRIGGER_FALLING;
267 }
268 
269 /**
270   * @}
271   */
272 
273 /**
274   * @}
275   */
276 
277 /**
278   * @}
279   */
280 
281 #endif /* defined (EXTI) */
282 
283 /**
284   * @}
285   */
286 
287 #endif /* USE_FULL_LL_DRIVER */
288 
289