bpm节拍计数器算法求解

2016-05-15 02:33:04 1.2k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

避开这些坑！在Quartus II里用Verilog驱动蜂鸣器播放音乐的5个常见错误本文详细解析了在Quartus II环境下使用Verilog驱动蜂鸣器播放音乐时常见的5个技术陷阱，包括系统时钟计算、音符持续时间设计、PWM占空比影响等，并提供了实用的解决方案和调试技巧，帮助开发者避免常见错误，提升FPGA音乐播放项目的成功率。阅读详情

如下图，运行出来的窗口，不管怎么点击，计数值都没有反应



import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.util.Date;



/**

 * Created by admin on 2016/5/8.

 * 创建一个按钮，触发时获取当前时间

 * 计算几次时间间隔的平均数，转换输出为bpm值

 */

public class Bpm extends Frame implements ActionListener {

    private JButton beat;

    private TextField bpm;

    



    public Bpm() {



        super("BPM计算");

        this.setSize(200, 200);

        this.setLocation(300, 240);

        this.setBackground(Color.lightGray);

        this.setLayout(new FlowLayout());



        bpm = new TextField("0", 4);

        this.add(bpm);

        beat = new JButton("咚！");

        this.add(beat);

        beat.addActionListener(this);

        this.addWindowListener(new WinClose());

        this.setVisible(true);





    }



    public static void main(String args[]) {

        new Bpm();

    }



    class WinClose implements WindowListener {

        public void windowClosing(WindowEvent ev) {

            System.exit(0);

        }



        public void windowOpened(WindowEvent ev) {

        }



        public void windowActivated(WindowEvent ev) {

        }



        public void windowDeactivated(WindowEvent ev) {

        }



        public void windowClosed(WindowEvent ev) {

        }



        public void windowIconified(WindowEvent ev) {

        }



        public void windowDeiconified(WindowEvent ev) {

        }

    }



    public void actionPerformed(ActionEvent ev) {

        Date[] date = new Date[180];

        int i = 0;

        long sum = 0;

        if (ev.getSource() == beat) {

            date[i] = new Date();

            i++;

            for (int j = 1; j < i; j++) {

                long time = date[j].getTime() - date[j - 1].getTime();

                sum = sum + time;

            }



            bpm.setText(String.valueOf(sum / i));//为什么这里无法使用j？



        }

    }

}