Freertos用状态机写按键控制3个LED

好的，我可以为您提供一个简单的思路，您可以根据这个思路实现您的需求。

1. 首先需要定义三个LED的GPIO引脚和按键的GPIO引脚，以及它们的输入输出模式，可以使用FreeRTOS提供的GPIO驱动库。

2. 然后需要定义三个LED的状态，可以使用枚举类型或者宏定义，比如：

#define LED_ON 1
#define LED_OFF 0

typedef enum {
    LED1_STATE,
    LED2_STATE,
    LED3_STATE
} led_state_t;

3. 接着可以定义一个状态机，用于处理按键事件，比如：

typedef enum {
    IDLE_STATE,
    PRESS_STATE,
    RELEASE_STATE
} key_state_t;

key_state_t key_state = IDLE_STATE;

4. 然后在任务中循环检测按键状态，如果按键被按下，则将状态机切换到PRESS_STATE，如果按键被松开，则将状态机切换到RELEASE_STATE。

void task_button(void *pvParameters)
{
    gpio_config_t io_conf;
    io_conf.intr_type = GPIO_INTR_ANYEDGE;
    io_conf.mode = GPIO_MODE_INPUT;
    io_conf.pin_bit_mask = (1ULL<<BUTTON_GPIO);
    io_conf.pull_down_en = 0;
    io_conf.pull_up_en = 1;
    gpio_config(&io_conf);

    uint32_t button_state = 0;
    while(1) {
        button_state = gpio_get_level(BUTTON_GPIO);
        switch(key_state) {
            case IDLE_STATE:
                if (button_state == BUTTON_PRESSED) {
                    key_state = PRESS_STATE;
                }
                break;
            case PRESS_STATE:
                if (button_state == BUTTON_RELEASED) {
                    key_state = RELEASE_STATE;
                }
                break;
            case RELEASE_STATE:
                if (button_state == BUTTON_PRESSED) {
                    key_state = PRESS_STATE;
                } else {
                    key_state = IDLE_STATE;
                }
                break;
            default:
                break;
        }
        vTaskDelay(10 / portTICK_PERIOD_MS);
    }
}

5. 最后在任务中根据按键状态控制LED的状态，比如：

void task_led(void *pvParameters)
{
    led_state_t led_state[3] = {LED_OFF, LED_OFF, LED_OFF};

    while(1) {
        switch(key_state) {
            case IDLE_STATE:
                break;
            case PRESS_STATE:
                if (led_state[LED1_STATE] == LED_OFF) {
                    led_state[LED1_STATE] = LED_ON;
                } else {
                    led_state[LED1_STATE] = LED_OFF;
                }
                break;
            case RELEASE_STATE:
                if (led_state[LED1_STATE] == LED_ON) {
                    led_state[LED2_STATE] = LED_ON;
                } else {
                    led_state[LED2_STATE] = LED_OFF;
                }
                led_state[LED3_STATE] = LED_ON;
                break;
            default:
                break;
        }
        gpio_set_level(LED1_GPIO, led_state[LED1_STATE]);
        gpio_set_level(LED2_GPIO, led_state[LED2_STATE]);
        gpio_set_level(LED3_GPIO, led_state[LED3_STATE]);
        vTaskDelay(10 / portTICK_PERIOD_MS);
    }
}

以上是一个简单的示例代码，您可以根据您的具体需求进行修改和优化。