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​ lvgl可以利用物理按键控制控件的选择和状态，演示视频如下：

单物理按键控制LVGL控件的选择和状态

移植方法如下：

• 1 在注册设备中，填写对应的变量和初始化函数。这里我们以移keypad为例，因为keypad的功能很多。
  ![请添加图片描述](https://i-blog.csdnimg.cn/direct/dee41d9aad8c42c69e955bc0ce943238.png

/* keypad */
static void keypad_init(void);
static void keypad_read(lv_indev_drv_t * indev_drv, lv_indev_data_t * data);
static uint32_t keypad_get_key(void);lv_indev_t * indev_keypad;

• 2 在lv_port_indev_init(void)函数中填写对应初始化内容
  

		/*Initialize your keypad or keyboard if you have*/keypad_init();/*Register a keypad input device*/lv_indev_drv_init(&indev_drv1);indev_drv1.type = LV_INDEV_TYPE_KEYPAD;indev_drv1.read_cb = keypad_read;indev_keypad = lv_indev_drv_register(&indev_drv1);/*Later you should create group(s) with `lv_group_t * group = lv_group_create()`,*add objects to the group with `lv_group_add_obj(group, obj)`*and assign this input device to group to navigate in it:*`lv_indev_set_group(indev_keypad, group);`*/

• 3 在这个三个函数里面填入你的设备内容
• • 1 static void keypad_init(void) //你按键初始化内容
• • 2 static void keypad_read(lv_indev_drv_t * indev_drv, lv_indev_data_t * data)//返回值控制控件的方式
• • static uint32_t keypad_get_key(void)//获取到按键对应值的函数

/*------------------* Keypad* -----------------*//*Initialize your keypad*/
static void keypad_init(void)
{/*Your code comes here*/key_gpio_config();
}/*Will be called by the library to read the mouse*/
static void keypad_read(lv_indev_drv_t * indev_drv, lv_indev_data_t * data)
{static uint32_t last_key = 0;/*Get the current x and y coordinates*/
//    mouse_get_xy(&data->point.x, &data->point.y);/*Get whether the a key is pressed and save the pressed key*/uint32_t act_key = keypad_get_key();if(act_key != 0) {data->state = LV_INDEV_STATE_PR;/*Translate the keys to LVGL control characters according to your key definitions*/switch(act_key) {case 1:act_key = LV_KEY_NEXT;break;case 2:act_key = LV_KEY_PREV;break;case 3:act_key = LV_KEY_LEFT;break;case 4:act_key = LV_KEY_RIGHT;break;case 5:act_key = LV_KEY_ENTER;break;}last_key = act_key;}else {data->state = LV_INDEV_STATE_REL;}data->key = last_key;
}/*Get the currently being pressed key.  0 if no key is pressed*/
static uint32_t keypad_get_key(void)
{/*Your code comes here*/return key_scan();
}			

• 4 创建一个组group，并将你想控制ui控件添加组，并将其与你的输入设备keypad关联起来，这样就可以控制了。

void setup_gui()
{lv_group_t * group = lv_group_create();//创建一个组// 创建屏幕对象lv_obj_t * scr = lv_disp_get_scr_act(NULL);/* 创建一个开关控件 */lv_obj_t * switch_obj = lv_switch_create(scr);lv_obj_set_pos(switch_obj, 50, 50);  // 设置位置lv_obj_set_size(switch_obj, 100, 40);  // 设置大小lv_obj_set_style_bg_color(switch_obj, lv_color_hex(0xffffff), LV_PART_INDICATOR);lv_obj_t * switch_obj1 = lv_switch_create(scr);lv_obj_set_pos(switch_obj1, 200, 50);  // 设置位置lv_obj_set_size(switch_obj1, 100, 40);  // 设置大小lv_obj_set_style_bg_color(switch_obj1, lv_color_hex(0xffffff), LV_PART_INDICATOR);lv_obj_t * switch_obj2 = lv_switch_create(scr);lv_obj_set_pos(switch_obj2, 350, 50);  // 设置位置lv_obj_set_size(switch_obj2, 100, 40);  // 设置大小lv_obj_set_style_bg_color(switch_obj2, lv_color_hex(0xffffff), LV_PART_INDICATOR);lv_obj_t * label;lv_obj_t * btn1 = lv_btn_create(scr);lv_obj_add_event_cb(btn1, event_handler, LV_EVENT_ALL, NULL);lv_obj_align(btn1, LV_ALIGN_CENTER, 0, -40);label = lv_label_create(btn1);lv_label_set_text(label, "Button");lv_obj_center(label);lv_obj_t * btn2 = lv_btn_create(scr);lv_obj_add_event_cb(btn2, event_handler, LV_EVENT_ALL, NULL);lv_obj_align(btn2, LV_ALIGN_CENTER, 0, 40);lv_obj_add_flag(btn2, LV_OBJ_FLAG_CHECKABLE);lv_obj_set_height(btn2, LV_SIZE_CONTENT);label = lv_label_create(btn2);lv_label_set_text(label, "Toggle");lv_obj_center(label);/*Create a slider in the center of the display*/lv_obj_t * slider = lv_slider_create(scr);lv_obj_align(slider, LV_ALIGN_CENTER, 0, 80);lv_obj_add_event_cb(slider, slider_event_cb, LV_EVENT_VALUE_CHANGED, NULL);/*Create a label below the slider*/slider_label = lv_label_create(scr);lv_label_set_text(slider_label, "0%");lv_obj_align_to(slider_label, slider, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);/* 将ui控件添加到组里面去 */lv_group_add_obj(group, switch_obj);lv_group_add_obj(group, switch_obj1);lv_group_add_obj(group, switch_obj2);lv_group_add_obj(group, btn1);lv_group_add_obj(group, btn2);lv_group_add_obj(group, slider);/* 将输入设备keypad关联起来 */lv_indev_set_group(indev_keypad, group);
}