| Traditional laser marking system is achieved by PC. Universal Serial Bus featuring high speed, bidirectional transmission, synchronization, and low cost,dynamical connection has developed into a new criteria for computer interface and a new generation of protocol for the communication between the computer and its Peripherals. It is designed for eliminating the conflict between all kinds of peripherals and avoiding the reconfiguration step when installing a new peripheral. This thesis present you a design of controlled card for laser marking based on the USB master/slave architecture.In the laser marking controller introduced in this paper, a USB processor CY7C68013 together with a data and a program memory which work with lower voltage and lower power consumer at high speed are applied as the core part, meanwhile the USB bus with good ability of data transmission at high speed and complex programmable logic device (CPLD) with less time delay which assures better data processing capacity of a system at high speed are extended here. SL811 was implemented here to control the read and write function of u disk, and solve the problem concerning the storage of a marking file. Particularly this design has a good human-computer interface which display in Chinese windows menu. It has achieved the function such as input, display, modify and store of the parameters of a marking file. The firmware programmed in C51 is reasonably designed that Host/Slave development personnel can work independently or corporately for its characteristics of opening, transplanting and expansion. Improvement of the hardware design is proposed here based on the analysis of samples of laser marking, moreover, the flow charts of the frameworks of the firmware program and of all function modules are particularly described.In the practical test, this card which introduced in the paper has achieved these functions such as data buffer, analog output, time pulse output and digital input and digital output. |
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