基于SPI通信方式的多通道信号采集器设计

文档编号:JD870  附开题报告,任务书,外文翻译,文档字数:12091,页数:29

摘要：在测量与控制系统中往往需要采集模拟量电信号，输入的信道数有时较多，需要分时采集。电信号的采集过程其实是计算机控制A/D芯片进行模数转换的过程，采集的结果为数字量，读入计算机后进行处理。如何快速、准确、可靠地进行信号采集，对于一个测控系统来说无疑是很重要的环节。
文中介绍一种以微控制器为核心，采用基于SPI通信方式的8路A/D转换芯片的电压测量、显示的电压采集系统设计，包括硬件电路和主要软件程序的编写。
关键字：SPI；LED显示；多路电压采集；单片机

Abstract: In the measurement and control systems often need to capture analog signals, sometimes the number of input channels is large, so need time-sharing in collection.signal acquisition process is the same as computer-controlled A/D chip for analog-digital conversion process, collecting the results of digital reading to the computer for processing.A term no doubt that it’s a very important aspect for measurement and control system that how to collect fast, accurate and reliable.
The design is completed acquisition system to gather voltage. The system kernel-based on microcontroller, using SPI communicate mode. 8-channel A / D conversion chip voltage measurements, showed that the voltage acquisition system. Including design the hardware circuit and the writing of main software procedure.
Keyword: SPI; LED display; Multi-voltage collection; Single-chip Mcro-computer

目录
1 绪言 1
1.1 课题背景 1
1.2 电信号采集的发展及意义 1
1.3 设计的主要内容 2
2 方案分析 2
2.1 几种串行总线的比较 2
2.1.1  I2C bus串行接口标准 2
2.1.2 MICR0WIRE及MICROWIRE/ PLUS串行接口总线 4
2.1.3 SPI简介 5
2. 2 设计任务的主要技术要求 6
2.3 系统总体结构 6
2.4 系统结构 7
3 硬件介绍 7
3.1  单片机系统的应用 7
3.2 基于SPI总线的MCP3208介绍 10
3.3  LED显示电路 14
3.4  RS-232数据传送 18
4  软件系统设计 20
4.1 开发平台介绍 20
4.2 MCP3208运行软件设计 20
4.3  8位LED显示 20
5 总 结 21
致 谢 23
参 考 文 献 24
附 录 25

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