基于DSP的ADC采样校正与显示系统

为了实现传统DSP的ADC采集校正与显示功能,设计了DSPF2812开发板和参考电压电路,通过为ADC采样通道提供两路精准的参考电压,消除了DSP采样时系统本身存在的误差和漂移。对温度和湿度采样信号进行限幅数字滤波,通过OCMJ8×15D液晶进行温湿度显示,实现人机交互。实验调试结果表明:校正后采样值与实际值的误差不超过0.3%,而且系统运行稳定,弥补了传统单纯采用DSP在ADC采集方面的不足。

Temperature and Humidity Sampling Calibration and Display System Based on DSP and ADC

In order to achieve DSP''s functions of ADC sampling correction and display, both DSPF2812 development board and reference voltage circuit were designed independently;through providing ADC sampling channels with two-way precision reference voltage, both sampling error and drift of the DSP were eliminated, including having the limited digital filtering applied to the temperature and humidity sampling signals and the temperature and humidity displayed via a OCMJ8×15D LCD so as to realize human-computer interaction.Both experimental result and debugging operation shows that, the error between sampling value and actual value corrected stays below 0.3%, and this system runs stably and makes up for the traditional DSP in ADC acquisition.