01. 概述5 x8 c8 d% D9 @. Y7 R/ W" O2 w, x. K! 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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. `. t4 U1 X% J' g8 B02. 相关类型
# L) Q2 M4 ?, X6 ^$ v% |+ A, {0 C6 u9 \EXTI模式枚举1 D8 Y1 I8 I6 ~/ K: K x
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- /** % G7 {3 w0 ~. W) m
- * @brief EXTI mode enumeration 2 I W) X0 r/ Z+ ?% n# B
- */* F- e, k/ u( J5 y9 D0 l) {4 t
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- typedef enum- ]8 [# i/ M% {4 P2 P3 Y
- {
3 x: w* c: R& ^9 h# i - EXTI_Mode_Interrupt = 0x00,
8 r& J0 |: n" r* S - EXTI_Mode_Event = 0x04( L2 S& L/ m, I, r. M$ ]
- }EXTIMode_TypeDef;
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4 V! F+ q% s6 k- #define IS_EXTI_MODE(MODE) (((MODE) == EXTI_Mode_Interrupt) || ((MODE) == EXTI_Mode_Event))
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, L$ c8 B2 S2 r; d/ eEXTI触发枚举- /**
9 J% U, X7 F5 y1 g0 u - * @brief EXTI Trigger enumeration
- i# `! W) w1 L* ?& p - */
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+ v: `% e0 ^- [* s7 M; ]- typedef enum
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- K. f" C8 D- l% v - EXTI_Trigger_Rising = 0x08, //上升沿
3 H3 X* L- T$ p4 e) @" v4 D - EXTI_Trigger_Falling = 0x0C, //下降沿, Z: b! J4 W, k, i: c
- EXTI_Trigger_Rising_Falling = 0x10 //边沿触发 d8 U# Z! p8 y7 }4 L6 y
- }EXTITrigger_TypeDef;8 X: F# \% l5 N4 \
3 z- S) [$ L- h. z& \6 r+ b- #define IS_EXTI_TRIGGER(TRIGGER) (((TRIGGER) == EXTI_Trigger_Rising) || \
' c% W! a$ k$ C' H4 [* H - ((TRIGGER) == EXTI_Trigger_Falling) || \8 R7 U$ ` u# w3 h! u
- ((TRIGGER) == EXTI_Trigger_Rising_Falling))
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EXTI初始化结构体
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- /** o1 f7 i! m5 Q7 n
- * @brief EXTI Init Structure definition
$ M; f7 Q+ ?& Y& g( k6 { - */
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5 I6 i: |) X( E" s( m5 o0 w- typedef struct$ I- g$ g; Z3 ~2 F D6 x
- {
! Z3 e$ Q4 b9 K" h: \6 Z - uint32_t EXTI_Line; /*!< Specifies the EXTI lines to be enabled or disabled.; [9 \: U. `* h
- This parameter can be any combination value of @ref EXTI_Lines */
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' R, h8 e! b4 b+ K: I- EXTIMode_TypeDef EXTI_Mode; /*!< Specifies the mode for the EXTI lines.
% I M. A$ W+ a7 {1 A# K - This parameter can be a value of @ref EXTIMode_TypeDef */
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- EXTITrigger_TypeDef EXTI_Trigger; /*!< Specifies the trigger signal active edge for the EXTI lines.
6 ]8 }( r+ \* r% v - This parameter can be a value of @ref EXTITrigger_TypeDef */
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' }5 g; m/ E5 q- FunctionalState EXTI_LineCmd; /*!< Specifies the new state of the selected EXTI lines.
# W* F2 ^, |% L+ J C - This parameter can be set either to ENABLE or DISABLE */
* m. }. t7 G. t7 [0 p - }EXTI_InitTypeDef;8 V8 Z3 v" {9 d0 f2 ?3 [
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Q$ q9 |9 G- Z9 D- /** @defgroup EXTI_Lines
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- */
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+ \) e6 y8 `9 }- F4 m! L- #define EXTI_Line0 ((uint32_t)0x00001) /*!< External interrupt line 0 */, w4 }/ A1 b* m( V) Q
- #define EXTI_Line1 ((uint32_t)0x00002) /*!< External interrupt line 1 */
' ]/ Z; s2 \: A/ j' y - #define EXTI_Line2 ((uint32_t)0x00004) /*!< External interrupt line 2 */2 X1 ]' Q0 [" Z ?- ~! x
- #define EXTI_Line3 ((uint32_t)0x00008) /*!< External interrupt line 3 */
' C$ U0 t: T; |: d! ]. u - #define EXTI_Line4 ((uint32_t)0x00010) /*!< External interrupt line 4 */) d E2 k9 K) T; Q: c2 o
- #define EXTI_Line5 ((uint32_t)0x00020) /*!< External interrupt line 5 */7 | k+ y% a/ t) Y
- #define EXTI_Line6 ((uint32_t)0x00040) /*!< External interrupt line 6 */
) V4 p( n B* E O - #define EXTI_Line7 ((uint32_t)0x00080) /*!< External interrupt line 7 */
( w" S2 b" a/ { - #define EXTI_Line8 ((uint32_t)0x00100) /*!< External interrupt line 8 */8 q- E$ g3 J' _1 h; F7 g
- #define EXTI_Line9 ((uint32_t)0x00200) /*!< External interrupt line 9 */7 D4 v- U6 R! {3 P5 b# B# P9 e
- #define EXTI_Line10 ((uint32_t)0x00400) /*!< External interrupt line 10 */3 b6 Q! G8 p" J
- #define EXTI_Line11 ((uint32_t)0x00800) /*!< External interrupt line 11 */0 X. ?3 w- ?/ U0 S2 E0 i
- #define EXTI_Line12 ((uint32_t)0x01000) /*!< External interrupt line 12 */
* j- M! _3 X! z5 p m - #define EXTI_Line13 ((uint32_t)0x02000) /*!< External interrupt line 13 */
" O" D5 B* M+ O/ x5 a - #define EXTI_Line14 ((uint32_t)0x04000) /*!< External interrupt line 14 */
. [: |# a& {% |5 u' C W1 M - #define EXTI_Line15 ((uint32_t)0x08000) /*!< External interrupt line 15 */+ U6 A6 ]8 O X: ^: }. ]% O' a1 H
- #define EXTI_Line16 ((uint32_t)0x10000) /*!< External interrupt line 16 Connected to the PVD Output */% P& I& ^/ w, d: B" z! c5 c1 b
- #define EXTI_Line17 ((uint32_t)0x20000) /*!< External interrupt line 17 Connected to the RTC Alarm event */
) N8 R C6 C" k8 U6 i - #define EXTI_Line18 ((uint32_t)0x40000) /*!< External interrupt line 18 Connected to the USB OTG FS Wakeup from suspend event */
" n& P5 a2 W0 r$ T/ M5 f - #define EXTI_Line19 ((uint32_t)0x80000) /*!< External interrupt line 19 Connected to the Ethernet Wakeup event */% B0 O3 C5 d0 x2 b. D% z
- #define EXTI_Line20 ((uint32_t)0x00100000) /*!< External interrupt line 20 Connected to the USB OTG HS (configured in FS) Wakeup event */* e% \2 k* k) m7 ?9 t2 u
- #define EXTI_Line21 ((uint32_t)0x00200000) /*!< External interrupt line 21 Connected to the RTC Tamper and Time Stamp events */
* p U# g5 e- C1 C4 B# J5 A - #define EXTI_Line22 ((uint32_t)0x00400000) /*!< External interrupt line 22 Connected to the RTC Wakeup event */ W5 I: i& G* ]$ C$ Q
- #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))
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; P+ l# M0 V- T- #define IS_GET_EXTI_LINE(LINE) (((LINE) == EXTI_Line0) || ((LINE) == EXTI_Line1) || \/ J. o* ]# k" C& n8 w) T
- ((LINE) == EXTI_Line2) || ((LINE) == EXTI_Line3) || \' W' @7 k7 q/ d' W) ]& P9 a5 ?- l. Q
- ((LINE) == EXTI_Line4) || ((LINE) == EXTI_Line5) || \
7 ?8 `) E5 _1 V4 |7 R - ((LINE) == EXTI_Line6) || ((LINE) == EXTI_Line7) || \
& _+ a5 a5 H: q0 _8 {: Q9 Z - ((LINE) == EXTI_Line8) || ((LINE) == EXTI_Line9) || \
- o! H" }9 X1 \1 r - ((LINE) == EXTI_Line10) || ((LINE) == EXTI_Line11) || \) K9 w6 u- W$ [. Q. c6 R$ v
- ((LINE) == EXTI_Line12) || ((LINE) == EXTI_Line13) || \
7 D1 } ~9 J/ b" o+ k5 |# ?7 i. l - ((LINE) == EXTI_Line14) || ((LINE) == EXTI_Line15) || \
^, s# p3 \% B - ((LINE) == EXTI_Line16) || ((LINE) == EXTI_Line17) || \
7 N! q& [& f8 M* M8 E3 ]5 {- S: _ - ((LINE) == EXTI_Line18) || ((LINE) == EXTI_Line19) || \
) @1 A7 s% u6 L$ Z. i7 z4 h - ((LINE) == EXTI_Line20) || ((LINE) == EXTI_Line21) ||\
0 K' d1 O7 k+ [( o' E - ((LINE) == EXTI_Line22) || ((LINE) == EXTI_Line23))
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( K3 @+ L$ ~9 @' |: \0 V+ d& o5 Q$ |03. 相关函数
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$ |# D. C4 E5 Y; ^; W" B. R- /* Exported macro ------------------------------------------------------------*/2 E9 L2 B# Y. \7 W# o* m
- /* Exported functions --------------------------------------------------------*/3 m9 E: v9 {% H2 W
& G" d. @6 a- V6 k& Y7 R) h; Y- /* Function used to set the EXTI configuration to the default reset state *****/( ]; z9 H! t# ~+ J" C* ~! S6 _3 h
- void EXTI_DeInit(void);4 K5 k& g4 m: @% f) s" L! @
6 c o. F! \7 W& }8 ]8 D- /* Initialization and Configuration functions *********************************/3 `5 ?/ Y. g2 P6 }7 m
- void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct);. W& [8 T& Z2 C7 e6 _, a
- void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct);4 G3 S0 h/ Z5 j, ?
- void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line);5 J, z' s4 }4 I, Z
0 k( C$ G2 n* A# \( e* V- /* Interrupts and flags management functions **********************************/" R! C" }) D& i0 X+ m5 C
- FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line);
/ s: e" h% p6 X3 G3 } - void EXTI_ClearFlag(uint32_t EXTI_Line);
/ k* b4 Q6 L4 G: ^ - ITStatus EXTI_GetITStatus(uint32_t EXTI_Line);1 P t# t1 g! M9 \) A
- void EXTI_ClearITPendingBit(uint32_t EXTI_Line);
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a `1 R3 L2 L, G$ `; K04. 结构体封装9 ^# `( p5 @5 P# f( w( l
外部中断控制器结构体封装- /**
& a$ M6 K* S- n+ [ - * @brief External Interrupt/Event Controller% ?0 V+ v( K c: X! W
- */
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: C" g( [! N0 U- H" Y# ~, p- typedef struct
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- __IO uint32_t IMR; /*!< EXTI Interrupt mask register, Address offset: 0x00 */
% ~4 Q1 V' z: [; l7 t - __IO uint32_t EMR; /*!< EXTI Event mask register, Address offset: 0x04 */
7 B$ s9 C9 l# s8 q7 w! u- h J/ w - __IO uint32_t RTSR; /*!< EXTI Rising trigger selection register, Address offset: 0x08 */
: v0 O( b9 e7 t0 k1 R1 Q. ? - __IO uint32_t FTSR; /*!< EXTI Falling trigger selection register, Address offset: 0x0C */6 h+ m$ h& a3 _$ O0 j" g8 i& c
- __IO uint32_t SWIER; /*!< EXTI Software interrupt event register, Address offset: 0x10 */& f& c: E& y6 |
- __IO uint32_t PR; /*!< EXTI Pending register, Address offset: 0x14 */
5 C6 w; [$ h4 k6 a7 P; k1 Z - } EXTI_TypeDef;
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