基于ARM嵌入式Linux的数据采集系统设计

Design of a Data Acquisition System Based on ARM Embedded Linux

摘要:

针对传统数据采集系统的不足,文中介绍了一种基于ARM9的数据采集系统的设计原理和实现方法；以微处理器S3C2440A为核心,外扩高精度A/D芯片AD7606,设计了数据采集硬件电路,分析了AD7606和PWM定时器的基本工作原理,借助于移植的嵌入式Linux操作系统,实现了基于PWM和GPIO口的ADC驱动及相应的数据缓冲与软件抗干扰；测试结果表明,由ARM和Linux组成的数据采集系统具有操作方便、采集精度高和测量结果准确等优点。

Abstract:

According to the deficiency of the traditional data acquisition system, this paper introduces the basic principle and implementation of a ARM9-based data acquisition system. The hardware circuit for data acquisition is designed with the microprocessor S3C2440A as the core and a high-precision, low drift AD7606 chip as a peripheral device. Basic operating principle of the AD7606 and PWM timers are described. By means of transplanting Linux system on ARM, device drivers for ADC using PWM intermediary conversion and GPIO port and the corresponding data buffer as well as anti-interference program are designed and implemented. The test results show that the data acquisition system composed of ARM and Linux is easy to operate and provides accurate measurements with high precision.