According to ARM's LCD touch screen system design strategy

Low-power LCD touch screen. Heat a small, low cost, slim lightweight, small size, easy to install. Using the LCD touch screen input and output of industrial equipment can achieve visual equipment requirements, facilitate on-site operation, but also reduce the cost of the product.
This design interactive interface based on S3C44BOX is a customizable, easy to use, excellent performance, general-purpose man-machine interface, can solve these problems.
System includes three parts, namely, PC,, S3C4480X microprocessor and lcd module touch screen
The system of industrial devices based on S3C44BOX interactive interface, through the system of industrial equipment can provide a visual user interface. Customized from the PC, good interface information is stored in the FLASH memory ARM. In the application which, when the microprocessor receives information touch screen buttons on the control of industrial equipment. At the same time the microprocessor interface also refresh the LCD, so to complete the human-computer interaction.
LCD touch screen module OCMJ15x20D Introduction
In text mode, can receive the standard Chinese characters in Chinese internal code displayed directly without the need to enter the graphics mode to graphics depicting Chinese, Chinese to enhance the efficiency of liquid crystal display. The module integrates a number of useful interfaces, including built-in 10-Bit ADC. Provide touch-screen interface.
Module FM7843 is a four-wire resistive touch screen input control chip. It is a synchronous serial interface with 12-bit sampling ADC.
System works
OCMJ15x20D LCD module built-in controller, and LCD touch screen installed in the liquid product screen, the corresponding control circuit designed LCD and touch screen controls. When the user operating the touch screen, the module FM7843 control chip to detect the touch point and send the detected information into the corresponding coordinates for S3C44BOX processor read.
System Software
Users can control the system practical application needs and control system and interactive interface of the agreement, through the PC, HMI visualization of custom software, customize the interface of good information. Good interface customization information then downloaded to the ARM's Flash, you can easily realize the human-machine interface customization. In the applications, ARM processor through direct operations I / O port and man-machine interface system interact, read, touch-screen information. Read the information and then perform the appropriate action. Part of the system's software by the user guide and application form. System running, the user interface to guide the implementation of the decision procedure to update the information or normal operation. If the implementation of the updated interface information, the system interface customization through the correlation function of the information received and stored in Flash, and then read through the local interface customization information to establish a new network list; if the normal operation of the local ditch taken directly from the old interface customization information to establish the network list. Applications to implement features include touch-screen display of input processing and interface. Users of the system and software for industrial equipment of all relevant parameters to be configured.
Custom interface and display
Interface customization foot by way of a network linked to achieve. The network after building a good list into the application phase, the system enters normal operation. Set the current screen by the system pointer, the current entry list pointer and networks have been constructed to achieve the man-machine interface operation.
Constitute the same screen two-way circular list of items, links, constitute one-way screen circular list. Approaches: first, to screen for the unit to establish bi-lateral per-screen circular list; and then traverse the doubly linked list of the screen, the screen is a link between the items, and then form a list network. By traversing the current screen to the horizontal two-way circular list of items one by one display screen. The towel on the treatment of various items as follows: ① When the screen is a text entry directly read and display. ② When the screen item is an integer, floating-point time. Obtained through the control system and display its value. ③ When the screen items to enumerate, through the control system to obtain its value, and then read the corresponding value of the string and displayed.