本文根据A/D转换和ARM处理器SPI接口的特点,设计了一种简单、实用的信号采集系统。文中给出了系统的硬件设计电路图,以及在嵌入式操作系统Windows CE下,用EVC编写的详细信号采集和数据传输控制程序。实验结果表明,采集的数据无误码、精度高、采集速度达400KHz,完全可以满足一般工业设备的要求。 According to the characteristics of A / D conversion and ARM processor SPI interface, this paper designs a simple and practical signal acquisition system. The paper gives the hardware circuit diagram of the system, and detailed signal acquisition and data transmission control program written in EVC under the embedded operating system Windows CE. The experimental results show that the collected data is error-free and high precision, and the acquisition speed can reach 400KHz, which can meet the requirements of general industrial equipment.