Arduino 上手教程
2. 设备开发 & 案例程序
3. M5Unified
5. 拓展模块 & 案例
Atom DTU
Hat
StickC Button 按键
read
函数原型:
uint8_t read();功能说明:
- 读取按键状态
传入参数:
- null
返回值:
- uint8_t:
- 1:按下
- 0:释放
案例程序:
cpp
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#include <M5StickC.h> void setup() { M5.begin(); M5.Lcd.println("Please pressed Button A.");} void loop() { M5.Lcd.setCursor(0, 0); M5.Lcd.printf("Button A Status: %d ",M5.BtnA.read());}lastChange
函数原型:
uint32_t lastChange();功能说明:
- 获取上一次状态更新的时间
传入参数:
- null
返回值:
- uint32_t: 上一次状态更新的时间ms
案例程序:
cpp
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#include <M5StickC.h> void setup() { M5.begin(); M5.Lcd.println("Please pressed Button A.");} void loop() { M5.update(); M5.Lcd.setCursor(0, 0); M5.Lcd.printf("The last change at %d ms /n",M5.BtnA.lastChange());}isPressed
函数原型:
uint8_t isPressed();功能说明:
- 判断按键是否按下
传入参数:
- null
返回值:
- uint8_t:
- 1: 按键处于按下状态
- 0: 按键不处于按下状态
案例程序:
cpp
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#include <M5StickC.h> void setup() { M5.begin(); M5.Lcd.println("Please pressed Button A.");} void loop() { M5.update(); M5.Lcd.setCursor(0, 0); if (M5.BtnA.isPressed()) { M5.Lcd.println("Button is Pressed."); }else{ M5.Lcd.println("Button is Released."); } delay(20);}wasPressed
函数原型:
uint8_t wasPressed();功能说明:
- 判断按键由释放状态, 变化为按下状态
传入参数:
- null
返回值:
- uint8_t:
- 1: 触发按键由释放状态变化为按下状态
- 0: 未触发按键由释放状态变化为按下状态
案例程序:
cpp
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#include <M5StickC.h> void setup() { M5.begin(); M5.Lcd.println("Please pressed Button A.");} void loop() { M5.update(); if (M5.BtnA.wasPressed()) { M5.Lcd.println("Button is pressed."); } delay(20);}pressedFor
函数原型:
uint8_t pressedFor(uint32_t ms);功能说明:
- 判断按键是否按下超过指定超时时间
传入参数:
- uint32_t ms：
- 按键按下超时时间ms
返回值:
- uint8_t:
- 1: 触发按键释放超过超时时间
- 0: 未触发
案例程序:
cpp
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#include <M5StickC.h> void setup() { M5.begin(); M5.Lcd.println("Please pressed Button A.");} void loop() { M5.update(); if (M5.BtnA.pressedFor(2000)) { M5.Lcd.println("Button A was pressed for more than 2 seconds."); delay(1000); }}isReleased
函数原型:
uint8_t isPressed();功能说明:
- 判断按键是否处于释放状态
传入参数:
- null
返回值:
- uint8_t:
- 1: 按键处于释放状态
- 0: 按键不处于释放状态
案例程序:
cpp
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#include <M5StickC.h> void setup() { M5.begin();} void loop() { M5.update(); if (M5.BtnA.isReleased()) { M5.Lcd.println("Button is released."); }else{ M5.Lcd.println("Button is Pressed ."); } delay(20);}releasedFor
函数原型:
uint8_t releasedFor(uint32_t ms);功能说明:
- 判断按键释放超时时间
传入参数:
- uint32_t ms：
- 按键释放超时时间ms
返回值:
- uint8_t:
- 1: 触发按键释放超过超时时间
- 0: 未触发
案例程序:
cpp
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#include <M5StickC.h> void setup() { M5.begin();} void loop() { M5.update(); M5.Lcd.setCursor(0, 0); if (M5.BtnA.releasedFor(2000)) { M5.Lcd.println("Button A was released for more than 2 seconds."); delay(1000); }else{ M5.Lcd.println("Button A is pressed "); }}wasReleased
函数原型:
uint8_t wasReleased();功能说明:
- 判断按键由按下状态, 变化为释放状态
传入参数:
- null
返回值:
- uint8_t:
- 1: 触发按键由按下状态变化为释放状态
- 0: 未触发按键由按下状态变化为释放状态
案例程序:
cpp
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#include <M5StickC.h> void setup() { M5.begin(); M5.Lcd.println("Please pressed Button A.");} void loop() { M5.update(); if(M5.BtnA.wasReleased()) { M5.Lcd.println("Button is Released."); } delay(20);}wasReleasefor
函数原型:
uint8_t wasReleasefor(uint32_t ms);功能说明:
- 判断按键是否按下超过指定超时时间, 释放后触发
传入参数:
- uint32_t ms：
- 按键释放超时时间ms
返回值:
- uint8_t:
- 1: 触发按键释放超过超时时间
- 0: 未触发
案例程序:
cpp
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#include <M5StickC.h> void setup() { M5.begin(); M5.Lcd.println("Please pressed Button A.");} void loop() { M5.update(); if (M5.BtnA.wasReleasefor(3000)) { M5.Lcd.println("OK"); }}