/* * Copyright (c) 2010, University of Luebeck, Germany. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Author: Carlo Alberto Boano <cboano@iti.uni-luebeck.de>, Joakim Eriksson, <joakime@sics.se> * */ import javax.swing.*; import java.awt.*; import java.io.*; public class ViewRSSI extends JPanel{ // Constants public static int TOTAL = 86; // Number of channel of 1 MHz sampled public static int DECREASE_RSSI = 2; // How many dBm the grey RSSI falls each sample public static int RSSI_MAX_VALUE = 100; // Maximum value obtainable from RSSI readings of CC2420. public static int MARGIN_BOTTOM = 20; // Margin from the bottom public static int MARGIN_RIGHT = 75; // Margin from the right public static int MARGIN_TOP = 12; // Margin from the top public static int INTERFERED_CHANNEL = 24; // Interfered channel public InputStream inputstr; private int[] rssi = new int[TOTAL]; // Array of current Noise floor values (black line) private int[] rssiMax = new int[TOTAL]; // Array with past Noise floor values (grey line) public ViewRSSI() { } public void paint(Graphics g) { Graphics2D g2 = (Graphics2D) g; int h = getHeight(); int w = getWidth(); double factor = (h - (MARGIN_BOTTOM*1.0)) / RSSI_MAX_VALUE; double sSpacing = (w - MARGIN_RIGHT) / (TOTAL*1.0); int sWidth = (int) (sSpacing - 1); if (sWidth == 0) sWidth = 1; // Set white background in the plot g.setColor(Color.white); g.fillRect(0, 0, w, h); // Gradient example (ytics background) GradientPaint greytowhite = new GradientPaint(w-MARGIN_RIGHT,0,Color.WHITE,w, 0,Color.lightGray, false); g2.setPaint(greytowhite); g2.fillRect(w-MARGIN_RIGHT, 0, w, h); // Draw the light grey channels from 11 to 26 double xpos = 10; for(int i=4;i<TOTAL-4;i++){ if (i==4+5*(INTERFERED_CHANNEL-11)) g.setColor(Color.cyan); else g.setColor(Color.lightGray); g.fillRect((int) (xpos+i*sSpacing), 0, (int) (sSpacing*3), h-MARGIN_BOTTOM); i = i + 4; g.setColor(Color.blue); g.drawString(String.valueOf(((i-8)/5)+11), (int) (xpos+(i-4)*sSpacing), MARGIN_TOP); } g.drawString(String.valueOf("Channel"), (int) (w-MARGIN_RIGHT+20), MARGIN_TOP); // Write the y-axis with dBm int base_dBm = -100; // The bottom corresponds to -100 dBm int ytics = 10; // How many tics on the y-axis for(int i=-ytics;i<=0;i++){ g.setColor(Color.red); g.drawString(String.valueOf(((ytics+i)*(base_dBm/ytics))+"dBm"), (int) (w-MARGIN_RIGHT+20), (int) (h+i*(h/ytics))-MARGIN_BOTTOM); // Dashed line for the ytics final float dash1[] = {10.0f}; final BasicStroke dashed = new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, dash1, 0.0f); g2.setStroke(dashed); g2.drawLine(0, (int) (h+i*(h/ytics))-MARGIN_BOTTOM, (int) (w-MARGIN_RIGHT+7), (int) (h+i*(h/ytics))-MARGIN_BOTTOM); } // Write the x-axis with MHz g.setColor(Color.blue); int start_x_axis = 4; g.drawString(String.valueOf(2400+"MHz"), (int) xpos, (int) h-start_x_axis); g.drawString(String.valueOf(2442.5+"MHz"), (w-119)/2, (int) h-start_x_axis); g.drawString(String.valueOf(2485+"MHz"), w-119, (int) h-start_x_axis); // Draw the old RSSI in each MHz channel (grey) g.setColor(Color.gray); double xposition = xpos; for (int i = 0, n = rssi.length; i < n; i++) { int rssi = (int) (rssiMax[i] * factor); g.fillRect((int) xposition, h - MARGIN_BOTTOM - rssi, sWidth, rssi + 1); xposition += sSpacing; } // Draw the current RSSI in each MHz channel (black) g.setColor(Color.black); xposition = xpos; for (int i = 0, n = rssi.length; i < n; i++) { int rssiVal = (int) (rssi[i] * factor); g.fillRect((int) xposition, h - MARGIN_BOTTOM - rssiVal, sWidth, rssiVal + 1); xposition += sSpacing; } } public void handleInput() throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); while(true) { String line = reader.readLine(); if (line.startsWith("RSSI:")) { try { String[] parts = line.substring(5).split(" "); for (int i = 0, n = parts.length; i < n; i++) { rssi[i] = Integer.parseInt(parts[i]); // An RSSI=0 corresponds to -100 dBm, an RSSI=100 corresponds to 0 dBm if (rssi[i] > rssiMax[i]) rssiMax[i] = rssi[i]; else if (rssiMax[i] > 0) rssiMax[i] = rssiMax[i] - DECREASE_RSSI; } } catch (Exception e) { e.printStackTrace(); /* Report error, but do not fail... */ } repaint(); } } } public static void main(String[] args) throws IOException { JFrame win = new JFrame("RSSI Viewer"); ViewRSSI panel; win.setBounds(10, 10, 590, 590); win.getContentPane().add(panel = new ViewRSSI()); win.setVisible(true); win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); panel.handleInput(); } }