STM32G4系列MCU学习笔记:按键模块
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" i( {7 E6 e" V前言
8 Y2 R1 V+ c' N" Y# S! 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。( H, Y- _* p+ E V6 Y: l
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。
% Q6 Z. {7 W3 G0 W% M1 U; @: F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~7 n" V) q }+ m2 M4 w& I! |, B; Y
一、硬件操作5 X" `' l w: ?, i( W
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。
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1. 原理图+ i& J8 V' j6 a( R
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。
" N( S; Z' h- v6 G4 B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 l5 n$ c% i! P* u% D1.点灯相关的IO口:PC8,PC9,PC10,PC11,PC12,PC13,PC14,PC15;
% D% U% }+ \2 t( p2.按键相关的IO口:PB0,PB1,PB2,PA0。
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$ A g! V# e$ K2. 硬件分析9 w h7 l5 [9 Y4 M6 A
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。7 M, `& A+ x5 I0 @# x
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3. 初始化代码
% X4 K9 U O0 a4 @. z$ T- /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
2 m- X4 U5 T$ V0 T( a. a- |& v - HAL_Init();//使用默认配置即可1 _( v2 D, p. I0 o
- /* Configure the system clock */
: h& R- a7 |0 a' O9 p) j, ~ - SystemClock_Config();
/ w9 K2 G" X9 w: e- @" \8 ] - /* Initialize all configured peripherals */, M, u, C5 \5 G& d) B( _( J
- MX_GPIO_Init();
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复制代码 (1)时钟设置
0 _& O& L/ [ j7 r* l这里我使用的内部时钟源HSI = 16MHz;配置HCLK = PCLK1 = PCLK2 = 80MHz。
" I) c/ U9 Z r$ V- void SystemClock_Config(void)3 [" @ G& S; u7 G$ ^
- {
/ H( |) d9 g0 U$ b, ?& p. p# C - RCC_OscInitTypeDef RCC_OscInitStruct = {0}; ?0 J% z; c" S: `2 l
- RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
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. E# ` E( |7 l! [9 x4 Q- /** Configure the main internal regulator output voltage
: E+ h- X4 G5 t - */
7 ~) [2 H( p% B& [2 s - HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);# D& f' j2 z/ n& L0 y
- /** Initializes the CPU, AHB and APB busses clocks
2 l( Q0 H; V9 E+ A3 y - */: h5 M: ?! k9 \* P! c! ^# z! m
- RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;9 B( o$ j( B& u
- RCC_OscInitStruct.HSIState = RCC_HSI_ON;
8 w8 O3 P ]& \3 W - RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;! }$ ?5 E) V/ |* f* i: u, b
- RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
1 R, E0 `" j( l0 T! I - RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;3 [, k( X2 W! e) `
- RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV2;; L$ c9 o/ a: W
- RCC_OscInitStruct.PLL.PLLN = 20;
; R# X. h5 R4 B. C z: U" ~ - RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;# H; K/ q/ S- |, c0 @
- RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
( N/ D+ M' I8 b - RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;" u' N0 ~, z: e2 [4 t
- if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)4 U y+ e3 X, |) C
- {
1 m- J' _. b Z1 P - Error_Handler();
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- /** Initializes the CPU, AHB and APB busses clocks ) W6 X' J6 U- j! x- I5 y( W' W* l
- */
% h0 |# A+ K( o. }. y7 `. N" } - RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
' [( N1 n! l8 N* s6 I - |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
$ {5 F+ S5 R4 c* W) D4 V) }* F - RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;4 w; E- l' ~& F7 S
- RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+ t/ Z: n$ T8 H5 f+ m: e6 j N - RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;7 T# U' U8 _: ?; K: {
- RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
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- if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)6 _9 b L3 V8 E7 Y; J
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- Error_Handler();
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复制代码 (2)GPIO初始化( U5 ~8 y- r3 E- p; ~* L
- static void MX_GPIO_Init(void), s* J( J$ m% K1 i J* E+ S
- {
' m, [' O) S3 @( u# N- T: ^1 W - GPIO_InitTypeDef GPIO_InitStruct = {0};
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- /* GPIO Ports Clock Enable */
3 @" y5 x5 u9 T2 w0 r - __HAL_RCC_GPIOC_CLK_ENABLE();
?3 ^# ^& V8 h: k0 k - __HAL_RCC_GPIOF_CLK_ENABLE();* X- T+ U4 ], v% t$ s& Q- k
- __HAL_RCC_GPIOA_CLK_ENABLE();
7 d% h2 f; _' |! q3 X - __HAL_RCC_GPIOB_CLK_ENABLE();/ j; S8 V2 b3 }7 n) v4 d
- __HAL_RCC_GPIOD_CLK_ENABLE();3 D D! Q4 K9 I) ^$ b+ [
- 3 V6 u" U l+ a! y- T
- /*Configure GPIO pin Output Level */
4 S: d/ i8 ?) s5 R - HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8
' e4 T( M" E1 ~( C! O* T - |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12, GPIO_PIN_RESET);/ P* V. J7 g( C2 q/ _9 |
. K7 b6 G" Z7 {5 o8 f5 N, v9 @- /*Configure GPIO pin Output Level */
$ B) f2 E6 \! K( c" M* _ - HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);( a+ H! G$ K; [' U' u# D
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- /*Configure GPIO pins : PC13 PC14 PC15 PC8
7 U2 A( M5 P1 |! o6 h# O - PC9 PC10 PC11 PC12 */
/ K! B" D, a6 p - GPIO_InitStruct.Pin = GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8 O! R) T! i" K# `0 V
- |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12;# Y" z" D( j/ i6 ~1 y3 ~
- GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
. d! m7 W4 w, M }# E - GPIO_InitStruct.Pull = GPIO_NOPULL;
9 ~1 R& ` B% Z8 {, P* U5 T - GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
+ Z% U0 A3 N6 r# c: o - HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);9 G2 q) ~& w* `$ C/ \. p! m3 P' C2 c
|8 l8 {6 R" w- /*Configure GPIO pin : PA0 */( H u, a4 ]4 ?' n3 i
- GPIO_InitStruct.Pin = GPIO_PIN_0;
# {# [% t& e! T1 E! v% B - GPIO_InitStruct.Mode = GPIO_MODE_INPUT;. O6 U& b$ z1 F9 y1 y% o8 C. ^
- GPIO_InitStruct.Pull = GPIO_NOPULL;
: U# [0 W5 v) F6 C5 |( V - HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
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- /*Configure GPIO pins : PB0 PB1 PB2 */9 M# t8 Z& E, r$ H4 ^- P/ y
- GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2;
/ E# U ~2 h3 j4 _8 i/ L - GPIO_InitStruct.Mode = GPIO_MODE_INPUT;; n8 {# Q4 q- f: G _
- GPIO_InitStruct.Pull = GPIO_NOPULL;6 o% E0 |% u# Z* z3 f) {
- HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
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- /*Configure GPIO pin : PD2 */
( |$ [+ Q* k$ z9 c& }: y$ J5 i% r4 { - GPIO_InitStruct.Pin = GPIO_PIN_2;
! u2 h5 z- a# O) }" h' | - GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;7 S8 F. y9 t6 J" h
- GPIO_InitStruct.Pull = GPIO_NOPULL;6 Q3 B/ ]0 N/ g
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
" s7 j0 T5 b( P$ t2 k( o; @- I - HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);$ b* k6 x- y: D5 d! B2 s; }
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复制代码 二、按键模块的驱动层实现4 v9 j: X7 p' m. U1 s* E2 |8 p5 H! f
1. 硬件框图* s4 V6 C3 O# m/ U+ n
在这里插入图片描述
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- M+ ~2 c4 c2 I% ]; B避坑点:% J& h5 U$ j+ q" L3 C3 u
短按:按键释放时判断时间# X+ e8 o. @# v: ^# i* E) @
长按:直接判断时间: X/ w z* v1 M. y& [. {7 \
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) c7 v0 X/ [! A0 W2. 按键驱动层代码实现8 Z5 K; e7 T1 C( z
下面直接上C代码:
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- ]( y. \# T( n3 p1 T(1)key.c
" ]0 `7 D1 g6 r! P" z" B! Y- extern unsigned int keyCount;5 H+ D, ~7 c+ N4 P+ L
- extern uint8_t keyValue;/ q& R) f0 z3 n- f6 k& m& ^( D: e
- uint8_t keyflag = 0;
4 d. |7 B; m5 b4 Z4 ` - void Key_Scan(void)2 j% i* e0 S- r1 f9 z
- {
, e: ?' A% I4 v+ Z - //keyState 按键状态;
1 v4 ], ^3 K5 [* S' k1 ^* p3 V - //keyPass 记录哪一个按键被按下
) n( B: Y% O1 M8 z - //keyCount 记录按键按下时间
1 N3 ~6 u% b8 K& [$ c, l - //keyflag 开始计数标志位,方便在Systick中断中进行计时) R5 b$ b4 Y2 T6 t
- //keyValue 返回给应用层的键值,用于判断处理相应的事件! |7 v0 X K& f5 Y
- //ShoutKeyx和LongKeyx是两个宏,为了区分短按和长按# I9 n6 H* l5 p" A: `3 K( b
- //ShoutKeyx 短按x键值,# s5 v8 L& E3 v/ T8 l3 w
- //LongKeyx 长按x键值
2 w* d9 Q7 L) _5 m5 P2 F! x - static uint8_t keyState = 0,keyPass = 0;
5 ~' e ]/ f3 G( ]. z8 \ - switch(keyState)5 S, G: |$ X1 x3 X- a: E
- {
- u; W `; H y) A( \ - case 0:if(KEYB_1==0||KEYB_2==0||KEYB_3==0||KEYB_4==0). O/ E. T4 h+ J% i6 ~
- {
1 U y/ }+ i& ^5 i2 P - HAL_Delay(100);//消抖
K* X5 P; b! d5 x0 n - keyState = 1;& \) t5 ~. o+ Q' O7 W' @7 Y6 c) [' q
- keyPass = 0xff; //初始化按键
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- break;% k4 O0 u" s6 n2 q, \6 f
- & c3 ^9 o# L9 b. O+ W
- case 1: if(KEYB_1==0||KEYB_2==0||KEYB_3==0||KEYB_4==0)7 v- u1 o0 ~7 ~5 i! `
- {
: m. X( D$ m" i* E+ [0 P - keyState = 2;
0 ]: H; v3 Z. F- o5 R- [ - keyflag = 1;//开始计数
; \% ?- P5 I8 n8 \) A s" q: n - if(KEYB_1==0){
7 V) V/ c5 P/ ^; j: E6 s - keyPass = 1;//返回对应键值
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) i k. q8 \! f% X [ - else if(KEYB_2==0)keyPass = 2;) ^( U2 [+ v3 t
- else if(KEYB_3==0)keyPass = 3;, Y, ~# b( J0 a+ [: n& ~" Y. N
- else if(KEYB_4==0)keyPass = 4;
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- else keyState = 0;//返回检测按键
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1 _, S* I' ^% f5 ^! h9 I - break;: y" e1 a8 U0 K; N! p' c
- case 2:
' b U# [) R7 ]" [5 U$ h' e$ J - switch(keyPass)
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! y" `0 ?4 a m: z9 h/ x( w - case 1:if(KEYB_1!=0) //判断是否释放按键: [ l( E. y9 Y, y; _9 V( p
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- if((10 < keyCount)&&(keyCount < 800))//短按0 }2 s% C. E8 ~2 |
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- keyCount = 0;
/ c+ i7 t4 H7 X8 _ - keyflag = 0;
& D8 a7 L: g% b - keyValue = ShoutKey1; - ^6 Q% R( Q2 `- Q0 s; c2 S
- keyState = 0;/ @ [7 `2 ?' _! n4 {0 u( s; i
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- } 0 s7 q' I" u9 z6 S* Z* b
- break;" L; m+ O8 z5 y- F5 c
- case 2:if(KEYB_2!=0)% [5 X% o' ]. f2 R/ m( I" t8 v3 D
- {
1 x1 p6 W; {8 S9 t# u; X - if((10 < keyCount)&&(keyCount < 800))//短按! u; S, S) M e0 p) Q( T6 F
- {
, m q! _) D1 |9 X: a - keyCount = 0;0 } ^9 ^7 } K% K0 z3 E! V
- keyflag = 0;! t5 R& J5 O- X) s
- keyValue = ShoutKey2; 0 J3 F2 H+ O. h( b) J6 {
- keyState = 0;* {! f' {8 A1 U
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- break;# }! D2 O9 a) k. z @" _/ b
- case 3:if(KEYB_3!=0)7 R7 F I+ t7 f1 @" {$ i
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- if((10 < keyCount) && (keyCount < 800))//短按
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- keyCount = 0;
+ O, ?: }1 A9 C, ]( x$ a - keyflag = 0;5 s, f8 S$ H: ?# F0 m( `
- keyValue = ShoutKey3; " P/ p" K7 }2 M) i' U
- keyState = 0;' C: {$ ~8 q3 x' G1 X
- }
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' m, p9 g. |0 v6 B - break;
4 }- l( b5 }/ }( W: x0 k3 \ - case 4:if(KEYB_4!=0)
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1 T2 s6 d- _9 p) s- N - if((10 < keyCount)&&(keyCount < 800))//短按
4 M: i2 Y6 i! Q7 ^ - {
9 n# I: L6 d9 U3 _: e; N - keyCount = 0;- F4 R4 Q5 c/ |9 E7 e- U, y
- keyflag = 0;
2 i: k$ V) x: t% w6 M - keyValue = ShoutKey4; 1 k& C1 k# {8 V0 J( d# F$ q
- keyState = 0;+ B. W: r, v* o! D6 P
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- }
" K1 Q' W( k m1 ]3 o: X, p# g0 ~ - break;' S. x+ t" T0 L6 X3 d
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- if(keyCount > 800)//长按- K$ {9 Q3 J( [2 v* C- J6 m- l. E
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- if(KEYB_1==0)keyValue = LongKey1;
" X& r) H4 I1 A( I, h9 G+ e - else if(KEYB_2==0)keyValue = LongKey2;
3 Q0 ~1 W; d; l - else if(KEYB_3==0)keyValue = LongKey3;
3 |; t5 }, y. p7 V! j) H - else if(KEYB_4==0)keyValue = LongKey4;
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( d( X3 f0 Z0 } q3 q8 Q& ?- keyState = 3;
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# i* W+ N2 Q) ~- K* w - break;3 S/ m6 b% k5 T# A' a
! W7 j+ q7 q; \6 K& j5 E% l- case 3: if(KEYB_1==1&&KEYB_2==1&&KEYB_3==1&&KEYB_4==1)
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- keyCount = 0;' ~9 B. v Q6 h
- keyflag = 0;
$ y1 h7 e4 M1 S - keyState = 0;5 q l# H. a; c
- keyValue = 0xff;//长按之后释放按键代表不执行操作,就没有键值传出
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- break;
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复制代码 (2)key.h$ G @6 {" t: @$ H
- #ifndef __KEY_H) R. W' k4 u" n. p1 C
- #define __KEY_H
3 K5 W8 Q" ^; r3 M0 }7 N7 n. m2 p - #include "stm32g4xx_hal.h"2 ]/ W; D0 s7 @; ^1 b, M) r: F
- #define KEYB_1 HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) //PB0' C2 _9 }$ U8 j* @$ {0 M
- #define KEYB_2 HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) //PB1
5 s6 T* h/ Z8 p9 b g+ ~! @) h - #define KEYB_3 HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2)//PB2
$ \1 U0 a G8 [& Q9 T - #define KEYB_4 HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0)//PA0) K4 T+ N8 y0 e
- #define ShoutKey1 10 |' y5 M! E" X/ A' ?: T$ k$ o a
- #define ShoutKey2 2; `* u& m. p: X! Q* `7 n9 _# l+ G
- #define ShoutKey3 3
# W# Q- L! I, N& ~ - #define ShoutKey4 4/ `3 Q- j! X5 e
- #define LongKey1 51 E- {6 W+ W$ X/ t9 y* ]' A
- #define LongKey2 6
9 n: |; m2 a& ]6 A+ G" Q - #define LongKey3 7
" g( V4 w& r$ s; i. U- I! ], ^0 i1 u - #define LongKey4 8& `* M2 @) f6 ]. @4 {3 L' x& X/ _
- void Key_Scan(void);
& q- B% A# e& ~* `0 q$ V+ a# }& y - #endif
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复制代码 3. 计时操作
( \0 j7 J Q0 d3 k1 N( B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。- r( ~& g3 v: N1 S/ Y* v0 w, b
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 G# s* b5 Y4 ]0 h Y" y R& r8 j6 z
- extern uint8_t keyflag;* S8 Y6 M, t+ E
- unsigned int keyCount = 0;9 \% a, O( L( L: g* z& s8 b' F
- void SysTick_Handler(void)
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- HAL_IncTick(); //这个api是用于HAL库的延时函数HAL_Delay(uint32_t Delay)6 e- X( _2 d. Q' ]3 R4 }9 z: }
- if(keyflag == 1) //若有按键按下就开始计时* u ]9 k* c8 d& `" e6 U
- keyCount++; 5 m% d8 o4 q* Y3 y
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复制代码 三、应用层简单逻辑实现
4 s7 u8 [% ]9 G5 X8 r! O% G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~: |) m# S5 J- K/ E2 \& @
- HAL_GPIO_WritePin(GPIOC, GPIO_PIN_All, GPIO_PIN_SET); //关闭所有灯 5 a2 l4 ~* X: D" y( w4 m
- HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET); //关闭锁存器1 g' t: c% R4 G6 O
- while (1)
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- Key_Scan();6 h- b D- B5 O8 Z, [" C
- if(keyValue) //有按键按下
O7 Q4 W' f( T3 r: e - {
- L( I- i5 v" K0 u - if(keyValue < 5) //短按
' x0 w. @4 ^) B - {
; a' E' Q" Z8 b& t - switch(keyValue)
. g1 i0 v! r# E: a" K - {
/ w% O: x' O& Y8 e - case 1:/ m) A4 k( L# s8 O$ K
- keyValue = 0;
9 m D. @, B( }% t4 ` - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_8);: h2 i3 a( {" x5 V0 x2 T% F) r0 O# q
- HAL_Delay(100);. Q/ |$ p2 ]+ C, i. J! _
- break;
) p1 v2 p* J( U4 \8 p, L - case 2:0 d0 i5 m! A6 Z3 w- t4 U4 T: v5 h
- keyValue = 0;
8 J9 R) R! g, p, V5 V. R+ X - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_9);
0 v9 k' t( e# f9 P9 l - HAL_Delay(100);
; e2 V6 S Y* Z; L1 ^2 R7 s - break;+ Z) a1 f2 ^: O# D$ Q9 r
- case 3:3 @/ R% ]/ C* b6 u8 N$ d) ~
- keyValue = 0;6 O+ V4 E4 X B' I! C. ^0 N
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_10);
# |8 }) b+ q$ L$ ^8 ^ - HAL_Delay(100);
: b4 W& B/ F% {3 ^0 R2 T/ h - break;
, @; c7 B3 ~# ~* W d - case 4: s1 L9 S; i* N2 r
- keyValue = 0; |0 [* O( t3 d% J
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_11);
3 [' U) f) x& e3 A* _" \. F* o - HAL_Delay(100);
$ ]& I- s+ q& Z2 ? - break;. x6 U8 J8 k5 U6 }! e/ E
- }
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- else5 z+ s) m T% o9 k: |3 ^% C
- {% A8 D$ `5 ^ L. f8 W
- switch(keyValue)
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- case 5:
7 E% z! O2 r& T3 q0 _3 i) w1 A5 q, Q - keyValue = 0;9 P+ F( W% r5 ~/ P: q% t
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_15);, F. |0 _8 i! A9 \% d+ C
- HAL_Delay(100);
% b3 f# M' V- v - break;6 q- s* ?! z2 T2 S! H
- case 6:
% J$ [" h! f& o: C6 K# K - keyValue = 0;2 U K# \- k7 d7 Q* ~
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_14);& ]& v2 t x9 @/ D! |0 H
- HAL_Delay(100);
7 c" }3 ^% G( w, D. w; k - break;
; Q" X3 k' y5 ~- ~) {( G7 j6 t - case 7:* `# |$ _( i5 @
- keyValue = 0;" |8 Z. F o. E8 k. d
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);
3 n& q U. |; s- V" h - HAL_Delay(100);
- C( L% r, R2 V' A5 R( \, S& V - break;
3 l0 L {! a, O3 k7 w - case 8:( ?: j& t7 e3 x
- keyValue = 0;
1 E, L( E. T% a5 q/ \& x - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_12);
- L3 A) e/ H7 O3 r. k - HAL_Delay(100);
' q; X4 H; o9 o0 d% D - break;
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- }
( S: b; W' e' C. [$ d- ^* g - }
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复制代码 总结
6 f' x0 S* [/ Y, j8 [6 V4 M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~。8 \3 i! p6 S8 j
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