STM32G4系列MCU学习笔记:按键模块
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前言9 N; I! T T" T! `9 a
我所学过的按键模块有独立按键和矩阵键盘两种,其实两者原理类似,本文主要介绍按键模块中实现长按和短按功能。
; g) n$ L4 A! p h注意了:本文是基于HAL库来进行介绍的,如果你想用标准库实现也比较简单,类比移植即可。* D( k+ e. }/ S; b" M# {2 }. w0 ~
由于作者第一次写博客,且自身水平有限,如文中有误,还请大家指正,谢谢~
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先放一张开发板的实物图,它长这样~
% R2 F! ~6 O5 C6 f1 d w一、硬件操作
5 p; f8 }' I4 f% Y9 C4 z在应用层中我利用不同的点灯程序来区分短按和长按所进行的操作。所以先来看看该模块所设计到的硬件原理图。: W1 o a6 ?* J3 ~4 q
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1. 原理图- {% n2 o; k/ v" m; j3 a _% s
注意了:点灯的这个模块,我们这里忽略这个锁存器芯片,不用它的锁存功能,着重于分析按键模块。
2 M% s# h$ U& [" ~3 ]我们先把所使用到的所有GPIO口列出来:(方便待会儿看程序更加清楚)8 m, S$ p. P3 T9 d$ x
1.点灯相关的IO口:PC8,PC9,PC10,PC11,PC12,PC13,PC14,PC15; T5 W' X0 r5 {6 q6 }
2.按键相关的IO口:PB0,PB1,PB2,PA0。
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2. 硬件分析& i8 s* k; t, a s9 \
从原理图里可以发现,我们如果将PB1设置为输入模式,去采集该GPIO上的电平状态,按键松开时,PB1上的电平应该为高电平,当我们按下按键后,例如:B2按键,PB1上的电平就会被拉低,其余按键类似,所以根据这样一个简单原理,即可实现按键的输入检测。" R% z: D) _4 \2 A
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3. 初始化代码! G! c7 X1 E! j7 f! A
- /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
$ a+ w5 K* ~8 Y& X. O, r; Y - HAL_Init();//使用默认配置即可
$ W) s$ s2 w/ Q. ` - /* Configure the system clock */" a# t! G" d2 ~( U
- SystemClock_Config();
( `: n' } [, U8 d- ?: \ - /* Initialize all configured peripherals */
+ a$ h9 N% d' f& C - MX_GPIO_Init();
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复制代码 (1)时钟设置
8 j; i- F. K! @1 g这里我使用的内部时钟源HSI = 16MHz;配置HCLK = PCLK1 = PCLK2 = 80MHz。9 d/ Z) w# y1 _
- void SystemClock_Config(void)+ h( [$ ?) w2 V+ `
- {
4 j" G& T& l' B0 h4 j8 ^. ? - RCC_OscInitTypeDef RCC_OscInitStruct = {0};, X4 w- V3 q% z' ]! U! x& `9 r: ]
- RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};8 G5 U( I O. z' g1 N; n0 I" H
- 1 G' d* |' D- o! A
- /** Configure the main internal regulator output voltage 9 d4 X& O' W0 K0 G1 N6 V$ s; {) C1 V
- */1 T5 }( v' g) i G2 w! G( ]
- HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);4 H. q- r. f" P2 b1 P2 j
- /** Initializes the CPU, AHB and APB busses clocks
( L# k9 x& f' @. H- m( V. ? - */$ l6 S2 {) u" O: o0 `! N( W
- RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;1 _1 o+ q" v, ~/ q
- RCC_OscInitStruct.HSIState = RCC_HSI_ON;5 k1 |; |7 z8 i l8 ?& n3 k% M. T2 y
- RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;. D) T. `3 w1 q9 m; i( x8 w
- RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
$ }3 C9 S3 a- W. Z2 L% ^ r9 j/ |/ o - RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;; B1 D6 e1 }/ p2 X& y1 N6 @) z
- RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV2;
3 @0 Y6 W2 G9 J* D% `1 S3 M- ^ - RCC_OscInitStruct.PLL.PLLN = 20;
6 j+ h5 v9 O( H; c' t* O - RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
$ r' c* G# F9 A2 c. `; D - RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
+ U/ J" F5 e9 Y2 F5 a' @ - RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
* u0 P( `4 E3 I2 z; Q" j( B* W - if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
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( I$ P, M% V, N. @* c - Error_Handler();' y8 T4 q) ]- i/ U- Y& T9 C9 j& K
- }
5 Z4 a7 _) } a3 c7 A - /** Initializes the CPU, AHB and APB busses clocks 6 n; V& H1 D6 U8 V% n: c+ ~/ b
- */; Y! m+ \" }8 P @. z# R9 W' D- P, Y
- RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
; H! g3 w# s& `1 \% t5 Y6 E/ @ - |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
! d5 t. _ S# r4 | - RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
/ b0 H4 A) w0 j# n" ]! T - RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;6 B/ y: J' Q: u, @9 x* O
- RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;" J+ u' J# c. _+ ]7 r1 z
- RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
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- if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)4 ]5 F# a1 J; F; p9 Q; n0 z
- {$ Z3 j4 A, y! ?8 Q9 D+ o: E
- Error_Handler();; i2 x! `! Z$ w
- }
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复制代码 (2)GPIO初始化
) o$ m' G7 v, z0 u- static void MX_GPIO_Init(void)/ q0 C- ~9 B. h- \
- {
: s% c% [5 H5 K0 x - GPIO_InitTypeDef GPIO_InitStruct = {0};: {, Q {' q- o& \. M: F4 v
* c: f4 @ U) ]9 Y( o# k- /* GPIO Ports Clock Enable */
* ^1 t3 E7 e# z8 E - __HAL_RCC_GPIOC_CLK_ENABLE(); ?- Z/ H0 b# E: d
- __HAL_RCC_GPIOF_CLK_ENABLE();
, j* f6 z; {9 f* G& z N - __HAL_RCC_GPIOA_CLK_ENABLE();% R) |/ u7 ~9 p
- __HAL_RCC_GPIOB_CLK_ENABLE();) K0 b% i1 C8 Y# t* z: y, j
- __HAL_RCC_GPIOD_CLK_ENABLE();
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g# ]$ M7 w7 b. W2 _9 y- /*Configure GPIO pin Output Level */
1 n3 h8 F# Q. v6 N0 |; ?/ u: t - HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8 # U* C; D; v5 O3 @& l4 E& q- [
- |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12, GPIO_PIN_RESET);3 a, E3 w7 H4 Q* }7 J+ |" o( D
- & h2 S! ]7 U* x6 T
- /*Configure GPIO pin Output Level *// }: R. i: Y# k+ o2 o
- HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);& S! J _- u& j2 ?+ R4 A. d
5 _" B* Q$ M( X8 q( W- /*Configure GPIO pins : PC13 PC14 PC15 PC8
5 } R9 C8 P, C% o7 w - PC9 PC10 PC11 PC12 */. a& F! U! X' X6 D; U
- GPIO_InitStruct.Pin = GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8
2 l' E0 x4 a) T - |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12;
: g: _+ g0 M' A1 ^ - GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
- Q. H9 |! B2 b" j( q7 a; H3 f9 J* W2 z - GPIO_InitStruct.Pull = GPIO_NOPULL;% P) w7 V6 a+ }& B# _$ M* R
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
3 J8 @8 a' G. I! c, L T. R - HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);; K, `4 z* q" f$ D
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- /*Configure GPIO pin : PA0 */
6 q; S9 Q; W% V1 [; D - GPIO_InitStruct.Pin = GPIO_PIN_0;
, k G1 d! ]- e8 ]" I( x, U - GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
$ Q: J g3 F9 n' |) Y# |7 x% T - GPIO_InitStruct.Pull = GPIO_NOPULL;
. I( W N" S- w$ h8 d - HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
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, f* d- H3 ~9 O& y7 P2 i; N- a- /*Configure GPIO pins : PB0 PB1 PB2 */$ ^+ b- A# K! N4 { ?% O% l
- GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2;
2 {7 D8 \( N7 _' [! G9 O3 X - GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
3 `( @. _4 x8 u4 z - GPIO_InitStruct.Pull = GPIO_NOPULL;
- K3 R# H$ x# w3 ] - HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);) [& f' y3 O9 M# N- `, z% e
- & a& c# O3 l" y: K7 n: }/ C8 Y" U
- /*Configure GPIO pin : PD2 */
; `6 ]9 [' W3 i; U( O4 x1 J - GPIO_InitStruct.Pin = GPIO_PIN_2;7 U1 f- b, d! @9 E# Z
- GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;7 @+ R, k$ k5 t N3 Z" a
- GPIO_InitStruct.Pull = GPIO_NOPULL;
8 z: m- ^$ W# t) M/ [) j - GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
! Y& o, X1 d! r( h9 Q2 ^ - HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
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- }
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复制代码 二、按键模块的驱动层实现 N3 \1 P% |2 U+ T
1. 硬件框图+ f* Z4 s& f, T6 p
在这里插入图片描述0 s% O& u8 D2 u; ?
5 H9 I$ Y3 U( O$ ]3 ~+ |避坑点:
8 r3 }2 e1 i( k t短按:按键释放时判断时间
3 v) H- Y. q) D6 \( ~长按:直接判断时间
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2. 按键驱动层代码实现
2 Q; l+ I# ^: ]. K9 ]5 s9 X3 M下面直接上C代码:
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(1)key.c) W8 X7 f( @& Z# ]
- extern unsigned int keyCount;! D$ C) q! I+ E+ ]
- extern uint8_t keyValue;3 A/ @' E' c1 T& x
- uint8_t keyflag = 0;
) S& w4 W' C3 Y% f' w9 P& j. M - void Key_Scan(void)
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- //keyState 按键状态;
) v# O+ r+ j, T+ K" W% I) F7 h' T - //keyPass 记录哪一个按键被按下* t" u; K' }: e3 m
- //keyCount 记录按键按下时间
: N$ Z7 P: p2 n0 A% @ - //keyflag 开始计数标志位,方便在Systick中断中进行计时0 B6 J: T; I( ]2 L5 D! Z+ i
- //keyValue 返回给应用层的键值,用于判断处理相应的事件2 Q: M, b F, `7 d8 p5 V
- //ShoutKeyx和LongKeyx是两个宏,为了区分短按和长按
3 A, E. c5 z; D/ j4 |& O0 S - //ShoutKeyx 短按x键值,) Z( h5 C, O% o; o5 y& g
- //LongKeyx 长按x键值7 k5 R8 o" C8 M5 E5 g
- static uint8_t keyState = 0,keyPass = 0;; P, _+ y9 f; [+ T
- switch(keyState)
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- case 0:if(KEYB_1==0||KEYB_2==0||KEYB_3==0||KEYB_4==0)
6 S8 p1 `* u7 D: B4 n - {
7 q$ }9 M0 g/ ^. X4 A0 J. w - HAL_Delay(100);//消抖
5 h5 R3 M! ~( v9 G- B - keyState = 1;. f* D2 f6 Y3 Y$ u$ {3 L: ?
- keyPass = 0xff; //初始化按键4 H' H4 H" _% s
- } / A3 f5 x- n# G1 ?+ a# d I
- break;
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- case 1: if(KEYB_1==0||KEYB_2==0||KEYB_3==0||KEYB_4==0)
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6 o8 O# {6 [+ W$ m' v) v2 ^: t - keyState = 2;
/ q8 H: i/ q8 c7 h - keyflag = 1;//开始计数
' E7 T4 y, P7 k R1 G - if(KEYB_1==0){
n0 y, i7 e1 P% Z# s/ g( e- W - keyPass = 1;//返回对应键值2 Q. R% X+ w) Z+ @" G, ^, s
- }
5 Y9 W l5 {" @ - else if(KEYB_2==0)keyPass = 2;8 J$ P' {1 g8 Z2 {* w# L
- else if(KEYB_3==0)keyPass = 3;0 [. S$ |/ e5 a+ d1 E/ c
- else if(KEYB_4==0)keyPass = 4;& X x3 Z( }# w8 Y
- }
+ E0 M- P/ n" X, X5 w - else keyState = 0;//返回检测按键
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- break;8 K7 @8 m: K/ v, _% ?; h' l; h
- case 2:+ k* Y0 J W: Z. W- R3 D" b
- switch(keyPass)
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: D/ J" {) j- w" y - case 1:if(KEYB_1!=0) //判断是否释放按键+ S; x( U' v: B9 x
- {' v: k0 T2 \0 V0 T% w% z1 d
- if((10 < keyCount)&&(keyCount < 800))//短按: N! B0 s) r/ ^5 Q# n- R9 s3 @# J
- {
3 u2 \. |1 }9 B9 O! n - keyCount = 0;, ?! S G$ J5 [$ L6 f
- keyflag = 0;
# J( t3 o6 w, Y6 _# `# U - keyValue = ShoutKey1; * r/ P' `3 j2 X9 X. }. I' F
- keyState = 0;* N- o' _0 U% e0 t0 p; {
- } # D D( r- H* M: k8 e
- }
3 o& ^5 _ V. O7 ]; W5 L - break;
- ~ |, c' f# p - case 2:if(KEYB_2!=0)' P9 x+ H; i* J) e# A _6 ^
- {/ d' \& g- e$ c+ N2 i
- if((10 < keyCount)&&(keyCount < 800))//短按9 ]- Z, v+ k+ d2 y2 i
- {
! I' |( t+ r' ~3 Q - keyCount = 0;
3 x' m4 G% o1 l7 G& @8 C - keyflag = 0;
6 J" P7 X* F" U7 e3 ? - keyValue = ShoutKey2;
% b5 O+ V t* ?5 A - keyState = 0;
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- break;
9 w- N$ t2 I/ H; V1 y0 G - case 3:if(KEYB_3!=0)+ _. Y. c4 B3 S! m& h+ W) A5 F7 Y
- {6 w3 u4 f- P+ Y+ q V, W
- if((10 < keyCount) && (keyCount < 800))//短按
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- keyCount = 0;
( ]9 v I8 S) W5 ]) z3 B J - keyflag = 0;
$ H# @4 z9 D7 J% P$ F# e& O - keyValue = ShoutKey3;
+ S$ E) v) L( k& ]9 u' o - keyState = 0;
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- } 1 U$ q J3 I* z; ^9 y% O1 I) E
- break;0 x+ Z3 S. h, ?- P% p, M6 H) I" d
- case 4:if(KEYB_4!=0)* F9 j* m ?% h
- {$ f9 T2 ]5 m7 I. @/ r& }: U# z
- if((10 < keyCount)&&(keyCount < 800))//短按
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- keyCount = 0;! o4 @/ n% V: E5 L/ `, p: x8 h
- keyflag = 0;6 ^6 q: W5 @) h, D; u# H/ m; \
- keyValue = ShoutKey4; : k# b% F: X- O, ~
- keyState = 0;
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- }
3 T- S8 I9 o: H( y - break;
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2 v; V i" H4 e3 {! b7 F - if(keyCount > 800)//长按
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. R5 P5 e' |5 L6 T1 ? - if(KEYB_1==0)keyValue = LongKey1;
( J+ d6 [; \' c& } - else if(KEYB_2==0)keyValue = LongKey2;& o0 w, u: ?3 A! B9 L" z6 J
- else if(KEYB_3==0)keyValue = LongKey3;
$ g1 d7 }, s8 L4 q" o D) \ - else if(KEYB_4==0)keyValue = LongKey4;9 R' w% m' y$ Y. [
- # J) o: C+ E+ x4 v$ y2 K0 I
- keyState = 3;
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- break;
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) U+ u# M0 b6 z6 c6 X- a ?& C- case 3: if(KEYB_1==1&&KEYB_2==1&&KEYB_3==1&&KEYB_4==1)( N" j6 Z' D( R8 K- A
- {* j \1 q2 h$ X. y6 H
- keyCount = 0;
2 W3 j, W' b6 E. @; c - keyflag = 0;( W/ x0 V+ C9 k Q" T" Z
- keyState = 0;
1 J6 O. v' b( A2 o( Y' {: }7 Q - keyValue = 0xff;//长按之后释放按键代表不执行操作,就没有键值传出
8 F8 D) H0 R8 J* D e0 W: A. G - }
6 S/ f6 R* t9 b& ` -
8 U+ H. U2 r# M3 h( y& | - break;
& y; B9 G6 ^8 y* X - }
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复制代码 (2)key.h5 C$ @5 A1 a* K) U
- #ifndef __KEY_H/ y/ y4 X+ k; Y1 d0 A' ~4 o% z
- #define __KEY_H
8 \# ]) g! u& p" b6 B - #include "stm32g4xx_hal.h"
" L8 T, S* z3 i* s5 B - #define KEYB_1 HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) //PB0
2 Z+ A- w% T0 w1 O' W( W - #define KEYB_2 HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) //PB1* D$ `1 Z! N+ r, Y
- #define KEYB_3 HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2)//PB2
9 p: P4 A, d, m# y - #define KEYB_4 HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0)//PA0
* Y. U( V9 p- o! Z8 X0 b- a - #define ShoutKey1 12 `9 F# G1 D1 n+ K
- #define ShoutKey2 2
, M& `* F! J: k! t$ P W9 ? - #define ShoutKey3 3* W' F) j5 D1 r0 k1 p# M4 J
- #define ShoutKey4 4
3 o/ o+ R3 C, A0 W2 h8 x4 q1 [ - #define LongKey1 5
+ ?: x8 I+ y/ g- Q0 A( G+ r) g3 c - #define LongKey2 6
5 s4 `: F* y9 r) [ - #define LongKey3 76 @, `4 _ L0 m; M
- #define LongKey4 8
0 k- Z4 y8 N7 I5 x - void Key_Scan(void);
% C, B" T: S. @( y6 \2 w - #endif. K" v% u N" K4 c J) v" i; d4 ~# L
复制代码 3. 计时操作
1 m, I) K" A4 t( x. I) p我使用Systick写了一个简单的定时中断函数,(触发Systick的定时中断时间是1ms)去处理计时操作,这是为了给按键驱动提供短按和长按的时间,便于在驱动层进行相应的判断,所以我不去深挖Systick模块的细节,本文会用即可,后面再单独来记录学习Systick模块。
$ g2 ~# \. i0 G3 e! U下面直接来看看Systick的中断服务函数叭,很简单,就这么几句~5 u8 v. a; U/ K- D+ N/ w; s
- extern uint8_t keyflag;
+ |$ I, ?0 w$ I! N7 h4 v- j4 l$ K - unsigned int keyCount = 0;
6 A) q, C- {: l$ a |# W - void SysTick_Handler(void)* S$ {, q4 {/ D" B; ]7 |
- {
8 a+ e/ ] ]! O1 f - HAL_IncTick(); //这个api是用于HAL库的延时函数HAL_Delay(uint32_t Delay)
" F+ C$ Z, S, l5 z8 I" T; C! N9 T9 G - if(keyflag == 1) //若有按键按下就开始计时- ~& v) @; q4 G3 ~4 o# O6 z
- keyCount++; C) |/ z0 l6 [$ T* Y( J( Z: ?
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复制代码 三、应用层简单逻辑实现 f" |0 |& T/ t: n1 v
应用层要做的事情在文章开篇其实已经说了,因为逻辑很简单,就是根据长按和短按实现不同的点灯程序,所以直接上代码叭~1 P, k6 Q& W+ B* p
- HAL_GPIO_WritePin(GPIOC, GPIO_PIN_All, GPIO_PIN_SET); //关闭所有灯 - D9 o* ?+ a q' f; J; z) B. \
- HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET); //关闭锁存器
' L" M5 Q5 q4 N, G m9 n - while (1)! l2 C/ Z3 J( i1 N
- {
0 ^8 f; g. ^, [8 G - Key_Scan();+ o& y# G" L( j
- if(keyValue) //有按键按下8 W* z7 E+ r- Y" v0 L' p! f
- {
8 @2 B& |+ z" A/ A6 ^3 G - if(keyValue < 5) //短按
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- switch(keyValue)
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- case 1:
2 F" D8 u2 p1 G" z- ? - keyValue = 0;# Z* b5 {6 V, W7 d
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_8);
" [8 A! W5 T5 ^1 H - HAL_Delay(100);" f+ `* Z4 w8 n* D
- break;
H" z8 a( S& i0 c$ b8 v" p6 S - case 2:
& c! M3 O3 r* x/ A8 W - keyValue = 0;) h: J* _9 Y' h
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_9);5 r$ M* a+ O' g4 r2 n
- HAL_Delay(100);
+ M" Q/ B. `; y8 ~$ s5 m - break;, |0 s q2 H7 r, l
- case 3:: _3 c$ G4 D ^+ e
- keyValue = 0;
( p- m, e! a1 o - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_10);' ^8 o0 M2 U1 J/ D; o
- HAL_Delay(100);
7 {- @3 E( ~& b5 X6 v! g& ?8 d - break;. L( P1 {3 x0 }7 v0 I
- case 4:
9 n$ L3 u( e' V% u - keyValue = 0;
1 h _8 |$ h2 q) i; I - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_11);
( L7 C. W! L2 Y4 j! B - HAL_Delay(100);
, G: n5 `8 ?8 g2 o6 _' c - break;; {4 L: g* F5 X- j# F1 u
- }
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6 ?" K' ^2 |9 c: Z - else/ |8 M/ s P1 K4 n$ _
- {
6 t6 h1 T8 |7 E5 S6 [0 E Q- G - switch(keyValue)! n* U8 L# G/ k1 c
- {# P% K8 h$ q. Q
- case 5:
( ?" E2 P. Q; p* i0 ~3 J4 p - keyValue = 0;- F) e" ~- C, K/ o
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_15);
: f: m9 k0 B* v' C5 [* { - HAL_Delay(100);6 z7 `) q* Q9 g! B" R
- break;
' D P* H# ?2 ? - case 6:! C1 R* ~+ l9 ~& ]- D
- keyValue = 0;
7 j. S# p O! n' p7 ^0 s - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_14);$ i @1 X9 e- V$ B! B9 \
- HAL_Delay(100);) R8 m5 H+ j, j* U4 D9 {
- break;5 s0 F( q) \) P6 h9 o
- case 7:7 |& m& U7 o# a2 ^! h% T$ F+ M% C( z
- keyValue = 0;
: a5 P ]5 r7 ~- ? - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);
. {& c+ x$ A- Z6 H( | - HAL_Delay(100);
0 Y7 b Z0 ~2 o, A# R - break;! T f4 U' G: v; P( ~
- case 8:
7 C/ z$ X( V. k - keyValue = 0;
0 _+ ^% C2 ?7 Y- c1 L9 d/ t - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_12);& o$ @# j7 l, S6 c# e) R
- HAL_Delay(100);
6 E* A: {( @# y8 D# H - break;
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- }
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复制代码 总结# w X! e# q3 B" b
以上就是今天要讲的内容,本文仅仅简单介绍了MCU里按键的短按和长按功能,希望能对你有所帮助噢~。. [3 x+ \6 @0 P) t, ]
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