基于DMA的连续脉宽数据采集装置  

A Data Acquisition Device for Continuous Pulse Width Based on DMA

作　　者：员玉良[1] 冯强 杨丽丽[1] 王方艳[1] YUN Yuliang;FENG Qiang;YANG Lili;WANG Fangyan(College of Mechanical and Electrical Engineering,Qingdao Agricultural University,Qingdao 266109,Shandong,China)

机构地区：[1]青岛农业大学机电工程学院,山东青岛266109

出　　处：《实验室研究与探索》2020年第2期60-63,共4页Research and Exploration In Laboratory

基　　金：国家自然科学基金项目(51775290);山东省重点研发计划项目(2019GNC106140);青岛农业大学教学研究项目重点建设项目(2017D01.20)。

摘　　要：提出了一种基于DMA的连续脉宽数据采集装置。该装置以STM32F767ZI单片机作为主控CPU,利用DMA的快速数据搬运能力,在无CPU干预的情况下,将定时器在输入捕获模式下测得的连续脉宽数据快速转运至内存存储,提高CPU的指令执行效率,实现较宽频率范围内的多通道连续脉宽参数的等精度获取。对连续脉宽数据采集装置进行标定。结果显示:该方法在高频段测量时,精度优于传统测量方法,测量频率范围宽,有效避免传统方法存在数据漏采漏读的弊端,具有较高的实用价值。A data acquisition device for continuous pulse width based on DMA was proposed. Using STM32F767ZI as the main controller,the device utilizes the fast data handling capability of the DMA to quickly transfer the continuous pulse width data measured by the timer in the input capture mode to the memory storage without CPU intervention. It improves the execution efficiency of the CPU and achieves a wider frequency range. Equally accurate acquisition of multi-channel continuous pulse width parameters is realized. The data acquisition device for continuous pulse width is calibrated. The results show that it is superior to the traditional measurement methods when measuring in the high frequency band,and the measurement frequency range is wide,effectively avoids the drawbacks of traditional methods for data leakage and missing reading. The device has strong practical application value.

关 键 词：直接存储器存取 数据采集 连续脉宽 

分 类 号：TP368.1[自动化与计算机技术—计算机系统结构]