M5Stack/examples/Unit/KEY/KEY-DEMO2/KEY-DEMO2.ino

/*
*******************************************************************************
* Copyright (c) 2022 by M5Stack
*                  Equipped with M5Core sample source code
*                          配套  M5Core 示例源代码
* Visit the website for more information:
* 获取更多资料请访问:
*
* Please follow the steps below to add FastLED library:
* - Arduino menu --> Manage Libraries... --> FastLED --> install
* 在烧录前请按以下步骤添加 FastLED 库:
* - Arduino menu --> Manage Libraries... --> FastLED --> install
*
* describe: KEY.  按键.
* date: 2022/6/1
*******************************************************************************
*/

#include <M5Stack.h>
#include <FastLED.h>

uint8_t ledColor = 0;

#define KEY_PIN  22  // Define Key Pin.  定义Key引脚
#define DATA_PIN 21  // Define LED pin.  定义LED引脚.
CRGB leds[1];        // Define the array of leds.  定义LED阵列.

void LED(void *parameter);
void changeLedColor();

void setup() {
    M5.begin();  // Init M5Stack  初始化M5Stack
    M5.Lcd.setTextSize(3);
    M5.Lcd.print(("\n UNIT-KEY Example\n\n    Key State:"));

    pinMode(KEY_PIN, INPUT_PULLUP);  // Init Key pin.  初始化Key引脚.

    FastLED.addLeds<SK6812, DATA_PIN, GRB>(leds, 1);  // Init FastLED.  初始化FastLED.

    xTaskCreate(
        LED, "led", 1000, NULL, 0,
        NULL);  // Create a thread for breathing LED. 创建一个线程用于LED呼吸灯.
}

void loop() {
    if (!digitalRead(KEY_PIN)) {  // If Key was pressed.  如果按键按下.
        M5.Lcd.setCursor(75, 130);
        M5.Lcd.print(("Pressed "));
        changeLedColor();  // Change LED color.  更换LED呼吸灯颜色.
        while (!digitalRead(KEY_PIN))  // Hold until the key released.  在松开按键前保持状态.
            ;
    } else {
        M5.Lcd.setCursor(75, 130);
        M5.Lcd.println(("Released"));
    }
    delay(100);
}

void LED(void *parameter) {
    leds[0] = CRGB::Red;
    for (;;) {
        for (int i = 0; i < 255; i++) {  // Set LED brightness from 0 to 255.  设置LED亮度从0到255.
            FastLED.setBrightness(i);
            FastLED.show();
            delay(5);
        }
        for (int i = 255; i > 0; i--) {  // Set LED brightness from 255 to 0.  设置LED亮度从255到0.
            FastLED.setBrightness(i);
            FastLED.show();
            delay(5);
        }
    }
    vTaskDelete(NULL);
}

void changeLedColor() {
    ledColor++;
    if (ledColor > 2) ledColor = 0;
    switch (ledColor) {  // Change LED colors between R,G,B.  在红绿蓝中切换LED颜色.
        case 0:
            leds[0] = CRGB::Red;
            break;
        case 1:
            leds[0] = CRGB::Green;
            break;
        case 2:
            leds[0] = CRGB::Blue;
            break;
        default:
            break;
    }
}