STM32G4系列MCU学习笔记:按键模块
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4 ]7 _4 |; y7 F前言
( @8 H; b5 W: d+ P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。
* k/ o! c& h. Y/ g! M2 |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。3 R% ^5 [0 n7 p* J
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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& H/ w9 c- w; I' E1 V先放一张开发板的实物图,它长这样~, X0 r: w* U* H* B
一、硬件操作- k' z+ ]3 y2 Y" a0 {: |9 Z4 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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" k3 t8 A+ L: |1. 原理图
" {+ J# d$ S, Q9 P8 W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。5 Z9 Y) n. ?$ `$ ]
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)
3 X v: i1 B' F1.点灯相关的IO口:PC8,PC9,PC10,PC11,PC12,PC13,PC14,PC15;
' L- h5 r5 i) Y$ F z2.按键相关的IO口:PB0,PB1,PB2,PA0。
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, \5 X, y9 b; s1 J$ U2. 硬件分析
) o: A% y/ j1 T" @2 k1 H- c0 w* ^& k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。
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3. 初始化代码# e; T2 u. h2 [
- /* Reset of all peripherals, Initializes the Flash interface and the Systick. */# O( t* L7 D" D
- HAL_Init();//使用默认配置即可/ L w5 I& }7 s& `" v! h2 ?
- /* Configure the system clock */+ h" L& e/ l/ a# {, j
- SystemClock_Config();% z( L( P% p0 B/ b V3 P1 Z4 H0 p. K) I
- /* Initialize all configured peripherals */8 U/ P" ]& h4 T3 m3 E& x% a
- MX_GPIO_Init();
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复制代码 (1)时钟设置" j# M% M7 e. c6 t% r
这里我使用的内部时钟源HSI = 16MHz;配置HCLK = PCLK1 = PCLK2 = 80MHz。
1 x- x" O# Q+ v: x% g- void SystemClock_Config(void)& {; D3 D% U) Z' `$ |* x9 t8 Z O
- {
: }; X) \; i1 y+ b - RCC_OscInitTypeDef RCC_OscInitStruct = {0};
' L+ H* X @9 e ^( v' C. T - RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
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% O/ k. T( \% y* W6 C- /** Configure the main internal regulator output voltage 5 O- @1 y! _* D/ _. A m5 |7 T( |0 p
- */
/ {; K' o: i# n& x1 N& | - HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);0 O, x! z( b; S; J
- /** Initializes the CPU, AHB and APB busses clocks - Q+ @3 U) K. R9 D( X
- */
+ N' G6 X# M2 f) f - RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
$ T; b" T ?6 B' | - RCC_OscInitStruct.HSIState = RCC_HSI_ON;9 s. L3 I+ F4 y \
- RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
- Q# p7 v1 c1 T. g - RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
- r* e( K. Y+ ?% v C4 b H - RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
; q; t6 \8 D0 Y; i" _ V2 ?# j6 [5 l% X - RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV2;7 r5 t+ d! X' M* H# |
- RCC_OscInitStruct.PLL.PLLN = 20;* p8 e! D( b: S: G
- RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;; h2 V! U ~; z1 l: f: A* l$ Z( ?
- RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
& r% G i$ A4 v; d& o+ @9 S' g4 C - RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;1 p6 N4 O2 M% j( \6 B' A- ~
- if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)7 B+ G% ` M7 B! Y# g5 G
- {
+ M0 a: P1 H! ~/ J - Error_Handler();+ A6 v" m |+ f5 J& w/ O* m1 q
- }
1 x- j K3 f/ }4 U. ~9 i, Z& ?) N - /** Initializes the CPU, AHB and APB busses clocks * _- U2 s# a* l; {! g" Q8 X2 K, U
- */
+ d* l% m2 m* [1 d - RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK1 l' I" v1 X0 `" p: z# m
- |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;( @6 g2 l* {+ X4 t. }% s
- RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;. b$ t( o( d# v& ]! }+ g
- RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;. e y- r7 @; E8 I' I! R- i
- RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
: I+ [1 L9 H7 B - RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
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; } ]& p2 r1 {) ~# j, t$ i- if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)3 d1 Q# f% S! ~9 k6 F2 ?7 e
- {
0 i- _2 a6 a7 Y& F - Error_Handler();1 H" ]$ {% V! ?) i7 q, W
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复制代码 (2)GPIO初始化
* e5 E1 H4 q$ }3 a- static void MX_GPIO_Init(void)
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- GPIO_InitTypeDef GPIO_InitStruct = {0};
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- /* GPIO Ports Clock Enable */
) {: D' H. J) ?4 N7 [$ y1 D0 S - __HAL_RCC_GPIOC_CLK_ENABLE();# c {+ S0 ^7 ?# S# o) r2 u
- __HAL_RCC_GPIOF_CLK_ENABLE();1 G5 c7 l( z3 Q, v/ r
- __HAL_RCC_GPIOA_CLK_ENABLE();
; A) e- N' l9 L3 T) M( g4 Z0 l" h" J - __HAL_RCC_GPIOB_CLK_ENABLE();
m- r7 \* u8 p6 A4 ]7 t9 P5 d - __HAL_RCC_GPIOD_CLK_ENABLE();
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( P1 ^, n3 z( B) n: W- /*Configure GPIO pin Output Level */; w% D" F! X: C0 T9 C- @" ]
- HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8
3 T. l7 q+ \+ l' A, `9 H( b, L - |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12, GPIO_PIN_RESET);% t& K" ~: w5 d% @# }
+ K7 ^, v7 Q$ y9 |- z' t- /*Configure GPIO pin Output Level */
+ \- `4 x2 w9 f) c8 c - HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);
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- /*Configure GPIO pins : PC13 PC14 PC15 PC8
) S2 B8 v. \: W* p - PC9 PC10 PC11 PC12 */
9 i8 q, h. x& o4 \3 f" N - GPIO_InitStruct.Pin = GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_8 4 Y6 R* e0 `) p; j
- |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12;0 t+ v: x6 m7 Y, F% U1 `" @
- GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;8 W+ r6 H$ A7 M/ J: ]
- GPIO_InitStruct.Pull = GPIO_NOPULL;" J: l) U( y8 ?# x% e/ T! U" {! W
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;; J/ W" {/ a0 L$ }( g, t1 a" ]
- HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
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; W8 s5 T% I% Q9 u- /*Configure GPIO pin : PA0 */
6 A6 ^% b5 a! _" ?5 b - GPIO_InitStruct.Pin = GPIO_PIN_0;# U Z, c1 B( k2 E, o3 y
- GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
! B C, H; w* q. f - GPIO_InitStruct.Pull = GPIO_NOPULL;
3 ^* i& j6 g) N' U( s8 G2 ^9 d - HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);( j# r' [8 x6 S: j5 M+ ?5 G' i
. g; d0 b; P, X% E, \- /*Configure GPIO pins : PB0 PB1 PB2 */' l2 R1 ~* @0 K( [( Y9 [
- GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2;5 k$ A( L$ o/ [4 L' F; A
- GPIO_InitStruct.Mode = GPIO_MODE_INPUT;: @$ Q5 z; C5 u* d& H1 `
- GPIO_InitStruct.Pull = GPIO_NOPULL;8 o9 K3 p Q3 Y
- HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);* I2 d4 e' ^6 T6 z
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- /*Configure GPIO pin : PD2 *// i, y2 W! n4 a4 ~1 t) B
- GPIO_InitStruct.Pin = GPIO_PIN_2;
- f u" _5 o. r+ f _ - GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
7 o( C! l+ ?+ u! X4 y - GPIO_InitStruct.Pull = GPIO_NOPULL;( {/ ]- G( G b& I/ X) X* a
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
( ~! j% O* `4 F/ {! u - HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);! |1 y. e- T8 e2 b
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复制代码 二、按键模块的驱动层实现 } S; c4 J; z: H. Z, J
1. 硬件框图
( U6 P! @. n4 U q4 g在这里插入图片描述
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避坑点:
- r* f6 v3 k U! Y短按:按键释放时判断时间
: r' D' W# P/ B. R长按:直接判断时间1 j# J0 B3 t% U4 s* ]
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2. 按键驱动层代码实现
( i l F7 a3 w: Y0 G4 P$ l, Q下面直接上C代码:
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(1)key.c u# o- F% }! V6 W# @3 j
- extern unsigned int keyCount;9 a) w. Z0 K$ t& {6 `8 X# o
- extern uint8_t keyValue;; [& H5 S) ^8 N9 Y2 ^ `
- uint8_t keyflag = 0;
3 I) x9 M4 X* U* `( ]0 c) G - void Key_Scan(void)
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- //keyState 按键状态;
: K. P* `# `! g: r5 ?' L. B. O - //keyPass 记录哪一个按键被按下; a" ^6 z: w2 u3 X% n
- //keyCount 记录按键按下时间
8 M4 y c$ B2 J - //keyflag 开始计数标志位,方便在Systick中断中进行计时# z* w2 w+ T4 x0 M& d7 H
- //keyValue 返回给应用层的键值,用于判断处理相应的事件' ~. @! P1 A! J' Q
- //ShoutKeyx和LongKeyx是两个宏,为了区分短按和长按; l* M/ e8 k$ k7 r+ N
- //ShoutKeyx 短按x键值,
2 i- @( [& g- _2 X: T' ?2 P) v - //LongKeyx 长按x键值' z+ W2 F4 ]( Z$ p' ]9 r1 h- E W
- static uint8_t keyState = 0,keyPass = 0;
1 O$ U8 v4 [! U - switch(keyState)
2 U# I- e9 C/ g' ~/ l - {
3 X, l* J1 M( m2 n1 i* M+ G - case 0:if(KEYB_1==0||KEYB_2==0||KEYB_3==0||KEYB_4==0)
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- HAL_Delay(100);//消抖
1 G! p( x$ g& Y# V, l2 {- {5 H - keyState = 1;1 x+ f# u% X' l
- keyPass = 0xff; //初始化按键1 c/ o8 }! w; X; p- f
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- break;
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- case 1: if(KEYB_1==0||KEYB_2==0||KEYB_3==0||KEYB_4==0)" d/ X: l8 ?! W! Y9 C9 l: \7 S
- {
' d' Y4 b! x, |# m - keyState = 2;
3 r2 n+ w6 D M9 ` - keyflag = 1;//开始计数
, X s: O! Y+ V: n- ^ Z& N9 Z, N - if(KEYB_1==0){
% F- L+ O3 ?3 o% e U2 _ - keyPass = 1;//返回对应键值
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- else if(KEYB_2==0)keyPass = 2;& E: Z1 A6 b4 m( N
- else if(KEYB_3==0)keyPass = 3;
9 V% d) t% l) m6 o. t9 Y - else if(KEYB_4==0)keyPass = 4;% E9 v/ J' U6 p) K2 x+ n* R
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- else keyState = 0;//返回检测按键 $ W0 H& ]5 `+ E6 _/ z
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- break;- D) a! p: h# V4 x
- case 2:
8 H! ` V( `$ w: V" G% B5 Z& D - switch(keyPass)
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- case 1:if(KEYB_1!=0) //判断是否释放按键
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- ^. X( o H1 F' N! ^ - if((10 < keyCount)&&(keyCount < 800))//短按; _3 B7 _) ^9 |, ]* ?' f6 R) R
- {
! H6 z+ W& {# b9 m - keyCount = 0;
- H% ?) U0 r0 r4 V$ F0 Q - keyflag = 0;, F$ j+ N& a/ I: }/ j
- keyValue = ShoutKey1;
: M1 N4 w( q" M: X - keyState = 0;% a. l$ u- |3 Y5 {4 n0 X
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- break;
7 @+ s- c& [6 H& \% |0 X. |0 B. ` - case 2:if(KEYB_2!=0)
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- if((10 < keyCount)&&(keyCount < 800))//短按5 y" v8 b, `$ r8 h
- {
8 G8 J, G9 u+ Z4 S \; x1 G# ~ - keyCount = 0;! e) X) Q! n0 `, ]% b
- keyflag = 0;
5 O3 w7 T) V' b% e+ ^ - keyValue = ShoutKey2; * R- w( ]2 w1 v- k) l Y8 X
- keyState = 0;( w7 l, F: M( p: O! p) D
- }
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- break;+ N0 L! K- ~+ r/ i) L9 R
- case 3:if(KEYB_3!=0)3 M4 m6 F* T+ Z. }& `
- {
* J% }4 e0 h/ W: M* @% c - if((10 < keyCount) && (keyCount < 800))//短按$ a1 F3 ], A, w; C
- {
! L Q) b6 b8 r: h/ j2 q7 G7 { - keyCount = 0;& q6 [' Y* J+ @' r; C, }. I% w
- keyflag = 0;
4 c6 i6 {/ l, C' z - keyValue = ShoutKey3;
, y" N+ o W5 j6 I$ Q. R, v - keyState = 0;
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- break;* `2 a0 j* |) d6 H% ~
- case 4:if(KEYB_4!=0)
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- if((10 < keyCount)&&(keyCount < 800))//短按: }) w2 ^' n) M: O
- {: X0 ]7 K9 q! n" D' V# ]
- keyCount = 0;8 I* R& _0 b- F5 \
- keyflag = 0;5 d' ~1 h/ x! T0 {) P. y4 c1 k
- keyValue = ShoutKey4;
' q% M3 @" E6 d( u/ Z% g - keyState = 0;. z% F9 F1 k9 g1 @+ ^
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- break;
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- if(keyCount > 800)//长按
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- if(KEYB_1==0)keyValue = LongKey1; " ]& g! @; d3 r3 Z9 K
- else if(KEYB_2==0)keyValue = LongKey2;
( L1 \3 Y0 i/ p" T& S/ H$ R2 Z - else if(KEYB_3==0)keyValue = LongKey3;
9 x5 o M- C, @+ l - else if(KEYB_4==0)keyValue = LongKey4;2 m1 h. M( o2 A2 `
+ `- X" Q6 u9 o9 B" X0 Z- keyState = 3;$ \4 t5 E: @, E* \
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- break;& a1 f) `& B: l3 q0 [. w' y! |) o
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- case 3: if(KEYB_1==1&&KEYB_2==1&&KEYB_3==1&&KEYB_4==1)' v% `% }1 _/ K5 G! C$ s u$ J: C/ \
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- keyCount = 0;
1 d+ S( g, |; `: i: u - keyflag = 0;1 Q; Q0 b, M; X
- keyState = 0;
2 C0 Q% D/ i# T- n3 ~ - 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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6 K0 _ n; K o9 ?( O% S8 }3 l7 p& G - break;
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- }
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复制代码 (2)key.h& {) G' Y9 V- ]5 y8 l
- #ifndef __KEY_H
# l( u) F! Q) w5 v: F - #define __KEY_H, R& R9 O4 M% w1 C ?9 D# a" q
- #include "stm32g4xx_hal.h" ^4 w8 \, H: _2 P$ k/ S
- #define KEYB_1 HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) //PB0
( ?/ a/ B2 ?: g! O' M& v - #define KEYB_2 HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) //PB13 b* I6 V. A/ u0 X0 I
- #define KEYB_3 HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2)//PB2. G* B! K( R. C
- #define KEYB_4 HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0)//PA0' Z* p! ^/ D0 R
- #define ShoutKey1 19 J! `; z& H: s( ?0 q; Z
- #define ShoutKey2 2
4 K! x6 U( A1 t( z - #define ShoutKey3 3! {2 T) m" I3 n$ l P
- #define ShoutKey4 4
$ n& Q8 j' Q# |) I6 W" W - #define LongKey1 5
' }& s" F9 f" I; ~; | - #define LongKey2 6
$ v- V/ {+ X- I5 u& a0 `- G - #define LongKey3 7
1 a3 z2 q+ B' H; d# l - #define LongKey4 8
. @" J8 F- X3 Z6 E - void Key_Scan(void);; c( U; J E- u; L7 _2 {
- #endif
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复制代码 3. 计时操作
" I2 n( `- w% j" N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。( S9 [5 C# K/ S- n6 J
下面直接来看看Systick的中断服务函数叭,很简单,就这么几句~1 Z5 M4 t4 x( v
- extern uint8_t keyflag;
* L! D: o9 g9 E0 {. L' U - unsigned int keyCount = 0;# ?1 y0 i0 h: y8 `: w
- void SysTick_Handler(void)6 ]( a* ]7 T& A- A7 K6 s
- {
$ }' B6 d0 H9 r7 I - HAL_IncTick(); //这个api是用于HAL库的延时函数HAL_Delay(uint32_t Delay). x. {# y: V7 L: L: O
- if(keyflag == 1) //若有按键按下就开始计时
$ s. J+ b7 U1 T; e - keyCount++;
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复制代码 三、应用层简单逻辑实现
8 e* m8 V& Q, o6 r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~0 |+ D7 Z6 _9 G/ F$ R! m
- HAL_GPIO_WritePin(GPIOC, GPIO_PIN_All, GPIO_PIN_SET); //关闭所有灯
6 X- ]+ Z7 v$ I+ ]: A! p - HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET); //关闭锁存器) K" Q5 D1 e2 I
- while (1)( @6 j/ L8 x* H& @
- {
6 T# k: }% x5 H& Q4 K) R, K6 R# Q2 D - Key_Scan();
4 ?" a# v1 H( P9 C - if(keyValue) //有按键按下- ?: G" E" t$ K9 o1 d% s
- {
$ l0 \. [' l( \& u& r) { - if(keyValue < 5) //短按# k- ^! b, K% N
- {
" | G+ u' j2 d( ]4 |: } - switch(keyValue)
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- case 1:- x+ B9 Y2 Q6 e- X
- keyValue = 0;" u, Y* @/ N1 n+ B" ~- L
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_8);0 |8 T M8 C" \' u. E2 S
- HAL_Delay(100);5 Z. n9 T. y& A6 G1 G" y
- break;! y' h+ Y3 b' \& d( j
- case 2:/ D/ g* N$ V4 n* R
- keyValue = 0;" T" _* W3 A9 S8 F' s9 X5 j
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_9);5 J. h/ S+ Z( y) Q. R
- HAL_Delay(100);
+ h1 r$ [7 _4 @' Y4 I$ T4 Y! A4 E - break;" ?# f7 l& W4 g, `5 G" D& z8 E) _' X
- case 3:, g' s% j9 J9 E$ w# v- C
- keyValue = 0;
+ W q H0 U6 m9 y- w( R - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_10);
' m3 n1 y. L4 n2 ^, U/ K3 R! h9 x8 ? - HAL_Delay(100);
& D( y& Q; v" K$ f8 X1 q1 Y0 T - break;
- O2 O$ f. W' y6 _; G2 f - case 4:& R, |5 L. l( `/ d4 Z5 M8 q+ S
- keyValue = 0;
# X9 k/ t5 o: q, V1 a) R) u - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_11);
- ]9 l0 z# E, Y/ P$ _) e9 Y; F1 i - HAL_Delay(100);
9 u ]' Q' a* T) w2 h& K - break;
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- }
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- {
- p' a0 T4 ?% {* f; Z0 s - switch(keyValue)
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- case 5:
1 n( V- A- [; A; x - keyValue = 0;
6 C+ u4 g. s2 [* U0 j {0 H - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_15);. U9 r7 a6 J7 K6 K
- HAL_Delay(100);1 F; k; P% n- r, l) l
- break;
) S6 W* N& ]7 f, A6 z; _( X$ ] - case 6:
/ T7 ~8 L/ R4 } - keyValue = 0;5 L# K: F1 |. B
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_14);
+ X. i4 X+ m7 F# Z - HAL_Delay(100);5 Q) `; `9 j8 \4 y" j5 a
- break;
# m4 M. i4 T+ a7 R1 n - case 7:- K# t. i/ R9 s# T; `
- keyValue = 0;1 O* B, B& ^8 G- j
- HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);* t; k" N" l! k
- HAL_Delay(100);7 Y0 M+ _! ~) Y
- break;
6 X. f6 k. Q5 ~ - case 8:
$ ?4 o9 t* G! G! a6 W4 w - keyValue = 0;
/ Y- M" S$ B) R/ j - HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_12);# R) z- l; E, K& N; e. L+ m
- HAL_Delay(100);* [# k P! y: |2 ?
- break;6 A W) }. B7 f j1 C. h
- }
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复制代码 总结! {# R& e( _9 {4 _; p
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~。
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