按下KEY0后，LED0亮度由亮变暗再由暗变亮（呼吸灯效果）；按下KEY1后灯熄灭的函数代码如何编写？

以下是按下KEY0后，LED0呼吸灯效果的函数代码：

#include <stdio.h>
#include <wiringPi.h>

#define LED_PIN 0
#define KEY_PIN 1

void breathLED() {
    int brightness = 0;
    int fadeAmount = 5;

    while (1) {
        analogWrite(LED_PIN, brightness);

        brightness += fadeAmount;
        if (brightness == 0 || brightness == 255) {
            fadeAmount = -fadeAmount;
        }

        delay(30);

        if (digitalRead(KEY_PIN) == LOW) {
            break;
        }
    }
}

void turnOffLED() {
    digitalWrite(LED_PIN, LOW);
}

int main() {
    wiringPiSetup();
    pinMode(LED_PIN, PWM_OUTPUT);
    pinMode(KEY_PIN, INPUT);

    while (1) {
        if (digitalRead(KEY_PIN) == HIGH) {
            breathLED();
        } else {
            turnOffLED();
        }
    }

    return 0;
}

以下是按下KEY1后灯熄灭的函数代码：

#include <stdio.h>
#include <wiringPi.h>

#define LED_PIN 0
#define KEY_PIN 1

void turnOffLED() {
    digitalWrite(LED_PIN, LOW);
}

int main() {
    wiringPiSetup();
    pinMode(LED_PIN, OUTPUT);
    pinMode(KEY_PIN, INPUT);

    while (1) {
        if (digitalRead(KEY_PIN) == HIGH) {
            turnOffLED();
        }
    }

    return 0;
}