High speed portable scanner based on DPS

Abstract

The scanner is composed of scanning head and control circuit. The character is that DSP digital signal processor is utilized. The storage unit includes DSP supplied 18 bits address line and 16 bits data line connected to 18 bits address line and 16 bits data line of flash memory Am29F400B. Buffer 74HC244 reshapes electrical level of signal unit of the scanning head. Serial CCD image signal of reshaped output is sent to BDR0 multichannel-buffered serial receiving pins. DSP converts the said serial signal to 16 bits parallel signal, which is received in DMA mode and temporary stored in RAM. Finally, data in the RAM are sent to data bus D0-D15. The invented scanner can complete scanning operation independently without computer, and features high adaptability, and high quality.

Description

Technical field: [0001] The present invention relates to scanners, and more particularly, to a scanner as an input device for a computer. Background technique: [0002] As an input device for images, graphics and text, scanners are becoming more and more common and become the third generation of microcomputer input devices after keyboards and mice. But all kinds of scanners on the market must be connected to the computer before they can be put into use. This brings great inconvenience to the use of scanners in some specific occasions such as traveling, visiting or field operations. [0003] The applicant proposed a portable scanner in the utility model patent with the patent No. ZL00261731.5, but because it uses a single-chip microcomputer, that is, INTEL's 8051 series, many aspects such as sampling rate, communication speed and cost cannot be achieved. As you wish. Invention content: [0004] The technical problem to be solved by the present invention is to avoid the d...

AI Technical Summary

Problems solved by technology

However, all kinds of scanners on the market must be connected to the computer before they can be put into use.

This brings great inconvenience to the use of scanners in some specific occasions such as travel, visits or field operations.

[0003] The applicant proposed a portable scanner in the utility model patent with the patent No. ZL00261731.5, but because it adopts a single-chip microcomputer, that is, INTEL's 8051 series, many aspects such as sampling rate, communication speed and cost cannot be achieved. Satisfactory

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