用STM32触发捕捉实现高速高精度测频

介绍利用STM32F103单片机实现高速、高精度测频的原理及方法。利用16位定时器4(TIM4)产生1s的溢出触发脉冲复位定时器2(TIM2),同时清零前的计数值被捕捉到通道1的捕捉比较寄存器TIM2_CCR1中。为了提高整个程序的效率,可及时响应各个中断,采用了消息驱动的方式,当1s溢出中断时,投递消息完成对显示器缓冲区的定时刷新。该测频系统最高频率可测到288MHz,最低可测到4Hz,性能稳定。

High Speed High Precision Frequency Measurement Based on STM32 Capture Trigger Function

The paper uses STM32F103 microcontroller to achieve high-speed, high-precision frequency measurement principles and meth- ods. The design adopts 16-bits timer 4（TIM4） to generate ls overflow trigger pulse to reset timer 2（TIM2）, and cleared before the count value are captured to channel l＇s capture compare register TIM2 CCR1. In order to improve efficiency of the entire program, time ly responding to each interrupt ,and it takes the message-driven way when the ls overflow interrupt, the delivery messages completes timing refresh of the display buffer. The highest frequency of the frequency measurement system can he measured to 288 MHz, the min- imum can be measured to 4 Hz, and the system has stable performance.