01. 概述
7 k) U/ _/ M) G/ A! D3 m中断相关代码主要分布在固件库的 stm32f4xx_exti.h 和 stm32f4xx_exti.c 文件中。
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02. 相关类型
% k2 s6 r! K" `" s7 C& ^) }EXTI模式枚举
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: e% X- E: o1 F- [$ D0 y# I- /** * M* r4 ^/ J8 ^8 J
- * @brief EXTI mode enumeration ; U( i' I$ g* p
- */
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2 g( a1 B( x3 ^# R$ e$ r/ q' j7 R- typedef enum4 q: ^+ a% ]/ Q- w
- {# c: w% u$ T" y7 f: C( [$ @
- EXTI_Mode_Interrupt = 0x00," q5 u& a: q2 d/ E1 b, m8 e
- EXTI_Mode_Event = 0x04
' U/ c {9 J( |8 f" Y. _ - }EXTIMode_TypeDef; X: m. v. H/ N% |
8 J6 g% F7 m0 r. f5 v- #define IS_EXTI_MODE(MODE) (((MODE) == EXTI_Mode_Interrupt) || ((MODE) == EXTI_Mode_Event))
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9 y& ?8 `0 j* R& I y# d2 y8 UEXTI触发枚举- /**
4 C0 W q. [% { - * @brief EXTI Trigger enumeration , u. N. B& c3 ?$ l$ D
- */- v) R4 H/ r9 C6 \ v& h! v
+ h! _" e: P( S) d$ A W- M- typedef enum
) W k( ^$ l& R2 u! Y$ K - {
5 F8 _4 W' X9 o: |" d - EXTI_Trigger_Rising = 0x08, //上升沿
5 Y) a1 l0 B% @7 [ - EXTI_Trigger_Falling = 0x0C, //下降沿
1 b: }" B/ P4 k4 }; S7 H! b* H( w; i - EXTI_Trigger_Rising_Falling = 0x10 //边沿触发
7 Y3 q( G8 n: ^/ s' ^8 `! A+ e9 J - }EXTITrigger_TypeDef;2 b: X6 U$ e4 W$ ]+ l$ ~
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- #define IS_EXTI_TRIGGER(TRIGGER) (((TRIGGER) == EXTI_Trigger_Rising) || \
4 r1 t9 g% g. S* S, v+ T - ((TRIGGER) == EXTI_Trigger_Falling) || \
% Q$ H& ?8 W8 b5 f. Z - ((TRIGGER) == EXTI_Trigger_Rising_Falling))
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EXTI初始化结构体
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$ t* ?2 P T& P" C1 Z0 g- /**
T$ k+ V6 Y" g( v) k - * @brief EXTI Init Structure definition
$ q4 q! e6 Q7 |+ h$ z1 t) E - */
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# y+ h' f8 p! | X" y/ Z5 Y) F- typedef struct1 f" \( v) i+ Y# S- ]
- {
+ l* }+ e/ X3 i& l: j& p - uint32_t EXTI_Line; /*!< Specifies the EXTI lines to be enabled or disabled.& t* n. ^+ Y% Y1 |4 L
- This parameter can be any combination value of @ref EXTI_Lines */2 j/ z5 t# @3 L: P4 s% @4 L
- 2 t" I" M! H/ }. K6 M% z1 v" p" W; q* E
- EXTIMode_TypeDef EXTI_Mode; /*!< Specifies the mode for the EXTI lines.! M8 d# |/ J4 N: c2 }& @8 B
- This parameter can be a value of @ref EXTIMode_TypeDef */
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8 X+ t6 I6 J% f3 n9 X- EXTITrigger_TypeDef EXTI_Trigger; /*!< Specifies the trigger signal active edge for the EXTI lines.4 V# H5 w* o% r d v
- This parameter can be a value of @ref EXTITrigger_TypeDef */
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- FunctionalState EXTI_LineCmd; /*!< Specifies the new state of the selected EXTI lines.
6 k4 z2 K! v7 R% ^. M7 I7 |4 Q - This parameter can be set either to ENABLE or DISABLE */
7 A5 U' P+ u; j" O+ S4 O. k/ I: a - }EXTI_InitTypeDef;2 w* S, i* [0 l
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5 [4 |. O J" l+ c& T2 N! [外部中断线. q: y2 ~" g# ?# `+ h1 _- u" }
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- /** @defgroup EXTI_Lines 4 \% d& i% n' i# B" Z: C: j
- * @{0 t' q5 v4 G! R' H
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- % e: b: i1 M! j! ~) j" T
- #define EXTI_Line0 ((uint32_t)0x00001) /*!< External interrupt line 0 */
( {: C/ @5 Y- F# m" V- J2 b - #define EXTI_Line1 ((uint32_t)0x00002) /*!< External interrupt line 1 */" m% O2 X& c: l$ d5 P7 r
- #define EXTI_Line2 ((uint32_t)0x00004) /*!< External interrupt line 2 */
`( G; ?7 `" R( i7 |4 \ - #define EXTI_Line3 ((uint32_t)0x00008) /*!< External interrupt line 3 *// j8 T" E# h6 P; e' a9 O
- #define EXTI_Line4 ((uint32_t)0x00010) /*!< External interrupt line 4 */) i0 B) l6 |) k8 q K. P% n# D
- #define EXTI_Line5 ((uint32_t)0x00020) /*!< External interrupt line 5 */
9 v5 I: n2 K) z* z+ E - #define EXTI_Line6 ((uint32_t)0x00040) /*!< External interrupt line 6 */' m( J! D% u6 X6 |
- #define EXTI_Line7 ((uint32_t)0x00080) /*!< External interrupt line 7 */
( X/ M/ V" }' s3 {6 Y - #define EXTI_Line8 ((uint32_t)0x00100) /*!< External interrupt line 8 */
& R. M- R4 e1 M* `& ^ - #define EXTI_Line9 ((uint32_t)0x00200) /*!< External interrupt line 9 */
2 o: i7 q; u$ S( c% i( Y7 d - #define EXTI_Line10 ((uint32_t)0x00400) /*!< External interrupt line 10 */
; o, d) [' X& M/ q) `( F - #define EXTI_Line11 ((uint32_t)0x00800) /*!< External interrupt line 11 */
6 F. O% U& I- ^ - #define EXTI_Line12 ((uint32_t)0x01000) /*!< External interrupt line 12 */
0 e. G) Y# p. { - #define EXTI_Line13 ((uint32_t)0x02000) /*!< External interrupt line 13 */
+ @! G: G) h$ ~$ E+ E' I - #define EXTI_Line14 ((uint32_t)0x04000) /*!< External interrupt line 14 */
' k+ Y* x- |$ h3 K2 H7 \ - #define EXTI_Line15 ((uint32_t)0x08000) /*!< External interrupt line 15 */& }/ n1 f% @3 A6 H7 o
- #define EXTI_Line16 ((uint32_t)0x10000) /*!< External interrupt line 16 Connected to the PVD Output */
2 I5 U' e( R6 k9 I# o) p0 u - #define EXTI_Line17 ((uint32_t)0x20000) /*!< External interrupt line 17 Connected to the RTC Alarm event */
" Q: M4 I1 N4 s- K% i6 p" `) @ - #define EXTI_Line18 ((uint32_t)0x40000) /*!< External interrupt line 18 Connected to the USB OTG FS Wakeup from suspend event */
& M' G$ L) o0 i) |: Q - #define EXTI_Line19 ((uint32_t)0x80000) /*!< External interrupt line 19 Connected to the Ethernet Wakeup event */
! F8 s! Z, P% |* {9 N1 s - #define EXTI_Line20 ((uint32_t)0x00100000) /*!< External interrupt line 20 Connected to the USB OTG HS (configured in FS) Wakeup event */$ U: W8 k/ d! ~# G. x2 x1 b
- #define EXTI_Line21 ((uint32_t)0x00200000) /*!< External interrupt line 21 Connected to the RTC Tamper and Time Stamp events */ 4 c F" z1 Y( K# c
- #define EXTI_Line22 ((uint32_t)0x00400000) /*!< External interrupt line 22 Connected to the RTC Wakeup event */7 j5 t$ k0 y( c( s0 ]
- #define EXTI_Line23 ((uint32_t)0x00800000) /*!< External interrupt line 23 Connected to the LPTIM Wakeup event */
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- #define IS_EXTI_LINE(LINE) ((((LINE) & (uint32_t)0xFF800000) == 0x00) && ((LINE) != (uint16_t)0x00))# M f9 t. t/ P4 Y2 Z4 y( L; B3 |4 s; @
- 2 s, L n$ t5 s- f, x# J) j' }
- #define IS_GET_EXTI_LINE(LINE) (((LINE) == EXTI_Line0) || ((LINE) == EXTI_Line1) || \' W) ^1 j; w' W$ j
- ((LINE) == EXTI_Line2) || ((LINE) == EXTI_Line3) || \
) W3 t. j: b1 Z. H$ h" N$ x - ((LINE) == EXTI_Line4) || ((LINE) == EXTI_Line5) || \
: h* O8 p- L( c5 m8 d9 Y% B - ((LINE) == EXTI_Line6) || ((LINE) == EXTI_Line7) || \0 r9 a9 f$ u' c! R& }
- ((LINE) == EXTI_Line8) || ((LINE) == EXTI_Line9) || \
% f* J0 B4 D3 m4 f5 z- [ - ((LINE) == EXTI_Line10) || ((LINE) == EXTI_Line11) || \' Z5 j4 ]" @$ u9 e% K
- ((LINE) == EXTI_Line12) || ((LINE) == EXTI_Line13) || \
$ k8 }! ^0 {2 `* q) `: j+ i+ X - ((LINE) == EXTI_Line14) || ((LINE) == EXTI_Line15) || \. C% y+ U8 j$ }" Q! V
- ((LINE) == EXTI_Line16) || ((LINE) == EXTI_Line17) || \* `6 A: `; g. F: s1 N4 J; T! T2 W
- ((LINE) == EXTI_Line18) || ((LINE) == EXTI_Line19) || \& T X" F' D7 d( L- [ C- s
- ((LINE) == EXTI_Line20) || ((LINE) == EXTI_Line21) ||\# J" a4 V3 d9 W) f
- ((LINE) == EXTI_Line22) || ((LINE) == EXTI_Line23))
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* w: D2 H) W3 O |9 y* ]+ o03. 相关函数
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/ s8 s/ w8 R9 X0 v# d4 Y. \- g& z- /* Exported macro ------------------------------------------------------------*/
2 b. J6 a" J; t2 t2 A8 o6 o% B - /* Exported functions --------------------------------------------------------*/& u9 \/ L+ y2 _- p1 o; w3 c4 R
$ V5 {( D& _+ a' x2 w; q3 S- /* Function used to set the EXTI configuration to the default reset state *****/
+ V D$ f" ~, f X - void EXTI_DeInit(void);, v* ~# g9 K* x+ o8 L0 N
- 8 f+ T+ p5 M0 f" c0 {. \. ?+ i! N6 `$ Y
- /* Initialization and Configuration functions *********************************/
' ?: s1 q8 b$ p8 |5 u - void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct);
) L7 X% J& x: V& v - void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct);
) w: O+ ^& J" U/ K - void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line);
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- /* Interrupts and flags management functions **********************************/
" T5 ~( L) |' Q$ {% G! H - FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line);
: [3 H) X( F* G, o% w# |" I - void EXTI_ClearFlag(uint32_t EXTI_Line);& K N& \2 Y& x% d
- ITStatus EXTI_GetITStatus(uint32_t EXTI_Line);
8 |) C/ ~4 ^3 ] - void EXTI_ClearITPendingBit(uint32_t EXTI_Line); y: t7 {% h! ]0 E# w; ?+ Z( @* ` Y% H
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8 z& T/ V& m: i+ M2 R0 Q- I. j04. 结构体封装" ^- o; Y1 |& {
外部中断控制器结构体封装- /** 4 ^; h: M3 O; N& {" W
- * @brief External Interrupt/Event Controller: q6 w9 m. N4 d
- */8 y) J* x! d$ ^, i5 r! B$ X
6 e0 ^0 F6 H' n& Y+ s5 D/ w' r- typedef struct2 L) R) W+ \% r
- {
* O( `. t+ u x! O# ?/ C5 b# z8 w - __IO uint32_t IMR; /*!< EXTI Interrupt mask register, Address offset: 0x00 */0 b/ r" [! _; \/ d. H ]9 D
- __IO uint32_t EMR; /*!< EXTI Event mask register, Address offset: 0x04 */) O* {1 }2 p, m6 j1 H* [5 e* i% @
- __IO uint32_t RTSR; /*!< EXTI Rising trigger selection register, Address offset: 0x08 */, q3 ]6 B0 j) ]- z" {* N
- __IO uint32_t FTSR; /*!< EXTI Falling trigger selection register, Address offset: 0x0C */
. ~3 s, ^0 F& g! ~: i' d - __IO uint32_t SWIER; /*!< EXTI Software interrupt event register, Address offset: 0x10 */
) \5 T" o0 d' I5 v9 W0 k - __IO uint32_t PR; /*!< EXTI Pending register, Address offset: 0x14 */8 G3 N/ O8 A" d5 [
- } EXTI_TypeDef;
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