`` 本帖最后由 zpzdd 于 2017-8-20 11:17 编辑
菜单设计是嵌入式中不可或缺的一部分，有的简单粗暴的，有的细致复杂。 关于菜单设计的方案也很多，专业问题大家可以参考下相关文献，这里我选择了一种结构鲜明、易于维护，实现简单的方法。 一般来说，多级菜单的逻辑结构都是多叉树的拓扑结构： 像这种：
在编程中，与之对应的可以用链表来组织。 首先确定一个菜单项需要具备的属性：本页菜单数量、显示内容、执行函数、上级菜单、下级菜单。
- struct MenuItem //
- { unsigned char MenuCount; //
- const char *DisplayString; //
- unsigned char (*Subs)(); //
- struct MenuItem *ChildrenMenus; //
- struct MenuItem *ParentMenus; //
- };
例如一页菜单中有5项，可以这样组织：
- struct MenuItem MainMenu[5] = //
- {
- {5,"1.SysTem Set ",&fun1,SysTemSet,NULL},
- {5,"2.EquipmenT ID ",NULL, EquipmenT, NULL},
- {5,"3.BaudRatE ",NULL, BaudRatE, NULL},
- {5,"4.System Infor ",NULL, NULL, NULL},
- {5,"5.System Haha ",NULL, NULL, NULL},
- };
下级菜单同理：
- struct MenuItem SysTemSet[5] = //
- {
- {5,"1.DatA Set ",NULL,NULL,MainMenu},
- {5,"2.timE Set ",NULL,NULL,MainMenu},
- {5,"3.AlARM Set ",NULL,NULL,MainMenu},
- {5,"4.BacKLed Set ",NULL,NULL,MainMenu},
- {5,"5.Password Set ",NULL,NULL, NULL},
- };
- struct MenuItem BaudRatE[7] = //
- {
- {7,"1.2400 ",NULL,NULL,MainMenu},
- {7,"2.4800 ",NULL,NULL,MainMenu},
- {7,"3.9600 ",NULL,NULL,MainMenu},
- {7,"4.19200 ",NULL,NULL,MainMenu},
- {7,"5.38400 ",NULL,NULL,MainMenu},
- {7,"6.57600 ",NULL,NULL,MainMenu},
- {7,"7.115200 ",NULL,NULL,MainMenu},
- };
- struct MenuItem EquipmenT[4] = //
- {
- {4,"1.No.01 ",NULL,NULL,MainMenu},
- {4,"2.No.02 ",NULL,NULL,MainMenu},
- {4,"3.NO.03 ",NULL,NULL,MainMenu},
- {4,"4.No.04 ",NULL,NULL,MainMenu},
- };
接下根据输入操作来改变指针指向的菜单结构体就可以了。 我这里只有2个按键，定义功能为：点击0键：上，点击1键：下， 短按0键：后退，短按1键：进入， 每次改变光标位置后后，由show_cursor()函数刷新光标位置。 翻页或切换新菜单后，由show_current_menu()函数刷新显示菜单。
- struct MenuItem* ptrMenu = MainMenu;
- u8 select_num = 0;
- u8 page = 0;
- show_current_menu(ptrMenu, select_num/LCD_MAX_DISP_LINES);
- while(1)
- {
- static u8 key_num = 0;
- while(key_num == 0)
- {
- key_num = get_key_value();
- }
- if(key1_cilck == key_num)//plus
- {
- select_num = (select_num + 1)%ptrMenu->MenuCount;
- show_cursor(select_num%LCD_MAX_DISP_LINES);
- if(select_num/LCD_MAX_DISP_LINES != page)
- {
- show_current_menu(ptrMenu, select_num/LCD_MAX_DISP_LINES);
- page = select_num/LCD_MAX_DISP_LINES;
- }
- }
- if(key0_cilck == key_num)//minus
- {
- if(select_num > 0)select_num--;
- show_cursor(select_num%LCD_MAX_DISP_LINES);
- if(select_num/LCD_MAX_DISP_LINES != page)
- {
- show_current_menu(ptrMenu, select_num/LCD_MAX_DISP_LINES);
- page = select_num/LCD_MAX_DISP_LINES;
- }
- }
- if(key1_short == key_num)//enter
- {
- if((ptrMenu+select_num)->ChildrenMenus!=NULL)
- ptrMenu = (ptrMenu+select_num)->ChildrenMenus;
- show_current_menu(ptrMenu, select_num/LCD_MAX_DISP_LINES);
- select_num = 0;
- show_cursor(select_num%LCD_MAX_DISP_LINES);
- }
- if(key0_short == key_num)//esc
- {
- if((ptrMenu+select_num)->ParentMenus!=NULL)
- ptrMenu = (ptrMenu+select_num)->ParentMenus;
- show_current_menu(ptrMenu, select_num/LCD_MAX_DISP_LINES);
- select_num = 0;
- show_cursor(select_num%LCD_MAX_DISP_LINES);
- }
- key_num = 0;
- }
``
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