用C语言写一个状态机识别按键的短按、长按、连续短按等操作

好的，以下是一个用C语言写的状态机，用于识别按键的短按、长按、连续短按等操作：

// 定义状态常量
typedef enum {
    IDLE_STATE = 0,
    SHORT_PRESS_STATE,
    SHORT_PRESS_DONE_STATE,
    LONG_PRESS_STATE,
    LONG_PRESS_DONE_STATE,
    CONTINUOUS_SHORT_PRESS_STATE
} buttonState_t;

// 定义全局变量
buttonState_t currentState = IDLE_STATE;
buttonState_t prevState = IDLE_STATE;
bool buttonPressed = false;
bool buttonReleased = false;
int buttonHoldTime = 0;
const int shortPressTime = 50; // 短按时间阈值
const int longPressTime = 1000; // 长按时间阈值
const int debounceTime = 10; // 消除抖动的时间

// 检测按键状态
void checkButtonState() {
    if (buttonIsPressed()) {
        buttonPressed = true;
        buttonReleased = false;
    } else if (buttonIsReleased()) {
        buttonReleased = true;
        buttonPressed = false;
    }
}

// 消除抖动
void debounceButton() {
    if (debounceTime > 0) {
        delay(debounceTime);
        debounceTime = 0;
    }
}

// 更新按键持续时间
void updateButtonHoldTime() {
    if (buttonPressed) {
        buttonHoldTime++;
    } else {
        buttonHoldTime = 0;
    }
}

// 状态转移
void transitionButtonState() {
    if (currentState == IDLE_STATE) {
        if (buttonPressed) {
            currentState = SHORT_PRESS_STATE;
        }
    } else if (currentState == SHORT_PRESS_STATE) {
        if (buttonReleased && buttonHoldTime < shortPressTime) {
            currentState = SHORT_PRESS_DONE_STATE;
        } else if (buttonHoldTime >= longPressTime) {
            currentState = LONG_PRESS_STATE;
        }
    } else if (currentState == SHORT_PRESS_DONE_STATE) {
        if (prevState == SHORT_PRESS_STATE && buttonPressed) {
            currentState = DOUBLE_PRESS_STATE;
        } else if (prevState == LONG_PRESS_STATE && buttonPressed) {
            currentState = LONG_PRESS_DONE_STATE;
        }
    } else if (currentState == LONG_PRESS_STATE) {
        if (buttonReleased) {
            currentState = LONG_PRESS_DONE_STATE;
        }
    } else if (currentState == LONG_PRESS_DONE_STATE) {
        if (prevState == SHORT_PRESS_STATE && buttonPressed) {
            currentState = SHORT_PRESS_STATE;
        } else if (buttonHoldTime >= shortPressTime) {
            currentState = CONTINUOUS_SHORT_PRESS_STATE;
        }
    } else if (currentState == CONTINUOUS_SHORT_PRESS_STATE) {
        if (buttonReleased) {
            currentState = IDLE_STATE;
        }
    }
}

// 状态处理
void handleButtonState() {
    if (currentState != prevState) {
        prevState = currentState;
        if (currentState == SHORT_PRESS_DONE_STATE) {
            onShortPressDone();
        } else if (currentState == LONG_PRESS_STATE) {
            onLongPress();
        } else if (currentState == LONG_PRESS_DONE_STATE) {
            onLongPressDone();
        } else if (currentState == DOUBLE_PRESS_STATE) {
            onDoublePress();
        } else if (currentState == CONTINUOUS_SHORT_PRESS_STATE) {
            onContinuousShortPress();
        } else if (currentState == IDLE_STATE) {
            onIdle();
        }
    }
}

// 主函数
int main() {
    while(1) {
        // 检测按键状态
        checkButtonState();
        // 消除抖动
        debounceButton();
        // 更新按键持续时间
        updateButtonHoldTime();
        // 状态转移
        transitionButtonState();
        // 状态处理
        handleButtonState();
    }
    return 0;
}

以上代码是一个基本的按键状态机，包含了处理短按、长按、连续短按等操作的状态。你可以根据具体的需求进行修改和优化。请确保 `buttonIsPressed()` 和 `buttonIsReleased()` 函数能够正确检测按键状态，`delay()` 函数能够正确实现延时。