Multi-level operation menu display system design
In the design of a single-chip microcontroller system, it is common to implement a multi-level menu interface on the display. Each level of the menu contains several items, each associated with specific key operations and corresponding processing routines. Traditional approaches often use function pointers as structural elements to represent the entire menu structure as an array of structures that include all menu items. However, this method integrates menu data directly into the functions, making it difficult to modify or update the menu content without altering the code itself. This lack of separation limits the flexibility and maintainability of the program.
Some references have attempted to improve upon this by adding display text and button labels to the structure, which increases its size and reduces flexibility. Additionally, the text is often stored in EEPROM, making it hard to change dynamically. Another approach involves using a window and message mechanism under the Windows system, but this introduces complexity such as managing stacks, message queues, and timers, which is not suitable for embedded systems.
This paper presents a lightweight, efficient method for implementing a multi-level menu on a single-chip microcontroller. The goal is to reduce system resource usage while maintaining simplicity and ease of development. To achieve this, the menu is divided into two independent modules: the menu window module and the keyboard processing module.
The menu window module is responsible for real-time display control based on the menu switching mechanism. It includes a switching mechanism that allows navigation between different windows and scrolling within the same level of menu items. Two key structures are used: `MenuState` and `MenuItems`. `MenuState` manages global transitions between windows, storing current and target indices for navigation actions like "up," "down," and "back." `MenuItems` holds the display information for each item in the current window, enabling dynamic updates during transitions.
The keyboard processing module handles user input from buttons, which are often multiplexed across different menu levels. The module parses button presses and maps them to the appropriate functions based on the current window context. This ensures accurate response to user interactions, even when the same physical button has different meanings in different menus.
An example application using the AT89C52 microcontroller and a graphic dot matrix LCD demonstrates the practical implementation of this approach. The system successfully supports multiple menu layers with minimal resource consumption and high modularity.
In conclusion, the proposed menu design offers a compact, modular solution for embedded systems. It separates data from functionality, enhances maintainability, and supports team-based development. Its low overhead and flexible structure make it ideal for a wide range of applications.
72V Lithium Battery,Lithium polymer battery pack factory,polymer battery cell,Rechargeable Lithium Polymer Battery
Shenzhen Jentc Technology Co., LTD , https://www.phenyee.com