Program Design Of Measurement System Based On Microcontroller And USB Interface

In recent years,With the rapid development of the computer network information and hardware industry,products used in computers and computer control systems that participate in control are also widely used in various aspects.Therefore,the requirements of data acquisition systems for related computer testing equipment have also gradually increased.At present,there are more and more PC peripherals,such as printers,scanners,SLR cameras,and MP4 devices.How are so many devices connected to personal computers? The USB interface is based on this purpose.Universal USB Interface is a fast,standardized interface for connecti ng computer-related devices.Its specifications are made by Intel,NEC,Co mpaq,DEC,IBM(International Business Machines),Microsoft,Northern T elecom Jointly developed.Compared to the traditional serial port acquisiti on process,the USB interface has many obvious advantages,Such as: sup port hot-swappable,suitable for a variety of devices,and in all system co nfiguration process is automatically completed by the system,without the user's own operation.In the original USB1.1 standard interface,the trans mission rate was 12 Mbps at a high speed,and the USB2.0 interface is m ore common nowadays,His high-speed transfer rate is 480 Mbps,which i s much higher than the normal serial interface,And the USB interface c hip cost is relatively low,which is very conducive to the development an d application of the USB interface,As of now,high-speed synchronous data acquisition is still in full swing.This article briefly introduces the main components,principles and h ardware direction of the USB interface data acquisition system,It mainly introduces the program control of the entire USB interface data acquisiti on,including the control system program of the SCM,the A/D signal pr ocessing acquisition program,the connection and communication between the SCM and the computer,and the selection of materials for each part.Through the program control of the software direction,the hardware circu it is added to form the entire acquisition system.The control program is the key part of the entire system and is also an important core part.