基于USB数据采集系统的设计+源程序
关键词：数据采集；USB；单片机；固件
USB data acquisition system design
Abstract: With the advent of the information age, data acquisition and storage of information has gradually developed. Along with the industrial areas of data acquisition increasingly high demand for traditional data acquisition card due to some problems can no longer meet the requirements of the contemporary data acquisition, high-speed data transmission upgrade of the entire system has a lot of sense. In recent years, the Universal Serial Bus (USB), its fast, plug and play, easy installation gradually become the development trend of modern data transmission, so the USB applied to the data acquisition system has great value. In this paper, design, complete USB-based data acquisition system, the system includes both hardware and software parts, hardware device selection, software including the host application software, microcontroller firmware and drivers of three parts. The hardware includes a selection of microcontroller devices, A / D conversion module, USB bus interface circuit, the paper presents the implementation process of the hardware circuit module, and the kind of system hardware design and debug.
Keyword：Data acquisition; USB; MCU; firmware
1 绪论 1
1.1 本课题研究意义 1
1.2 课题背景 1
1.3 USB的优点 1
1.4 国内外研究现状 2
1.4 课题研究内容 3
2 USB协议与规范 4
2.1 USB发展过程 4
2.2 体系结构概述 4
2.2.1 USB系统描述 4
2.2.2 物理接口 5
2.3 USB设备 5
2.3.1 设备接口 6
2.3.2 USB逻辑设备 6
2.3.3 功能单元 7
2.4 USB数据传输 7
2.4.1控制传输 7
2.4.2同步传输 7
2.4.3中断传输 8
2.4.4批量传输 8
2.4.5 四种传输类型总结 8
3 系统硬件设计 9
3.1实际应用系统设计 9
3.2 USB控制电路 9
3.2.1 USB控制芯片的选型 9
3.2.2 PDIUSBD12 9
3.2.3 USB模块电路设计 13
3.3 STC89C51单片机结构与特点 14
3.3.1 STC89C51封装及引脚说明 15
3.3.2 单片机模块电路设计 17
3.3.3 STC89C51内置USB控制器 17
3.4 A/D转换电路设计 19
3.4.1 A/D转换器 19
3.4.2 A/D转换器接口电路 21
4．系统软件实现 23
4.1 固件程序任务 23
4.1.1 固件程序任务 23