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Status abfrage ergänzt und Source Code kommentiert (englisch).

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Alex Volkmann 2019-03-11 17:14:42 +01:00
parent 0b6932317f
commit a5d6ef930c
2 changed files with 241 additions and 204 deletions
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204
gpio_java.java
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@ -1,204 +0,0 @@
/**
* @author Alex Volkmann
* @date 18.02.2019
* @function Das programm steuert ein relle an und macht es an oder aus
*/
import java.io.IOException;
import java.util.Arrays;
import java.util.concurrent.TimeUnit;
// todo: add Dokumentation
public class gpio_java
{
public static String rel_map [][] = {
{"rel1","14"},
{"rel2","15"},
{"rel3","18"},
{"rel4","23"},
{"rel5","24"},
{"rel6","25"},
{"rel7","8"},
{"rel8","7"}
};
public static String [] action = {"on", "off", "status"};
/** Die main-Methode ruft die Funktionen in der gegebenen Reihnfolge auf,
* und gibt die @param args weiter.
* @param args Commandline argument der main funktion
*/
public static void main (String [] args)
{
// Zum checken der Anzahl der Argumente
checkargs(args);
// todo: initialisiere alle acht ports (outputs)
init_gpio();
// setze gpio (gemaes der parameter)
gpio_getport(args[0]);
gpio_cmdhandler(args[0], args[1]);
return;
}
/** Die checkargs-Methode prüft ob zwei korrekte Argumente eingetragen wurden.
* @param argumens - Commandline argument
*/
public static void checkargs(String[] argumens)
{
int laenge = argumens.length;
String [] h = {"-h"};
int idx;
boolean parameter1 = false;
boolean parameter2 = false;
//Prüft ob zwei args angegeben wurden.
if (laenge == 2)
{
//Prüft ob ein richtiges erstes args angegeben wurde.
for (idx = 0; idx<8 ; idx++)
{
if (argumens[0].equals(rel_map[idx][0]))
{
parameter1 = true;
break;
}
}
//Prüft ob ein richtiges zweites args angegeben wurde.
for (idx = 0; idx<3 ; idx++)
{
if (argumens[1].equals(action[idx]))
{
parameter2 = true;
break;
}
}
}
// Wenn es nicht zwei Args sind dann wird getestet ob ein h drin ist.
// Wenn ja führt die Funktion show_usage aus.
else if (Arrays.equals (argumens, h) == true)
{
show_usage();
System.exit(0);
}
//Wenn Kein h drin steht und es kein der beiden args enthält kommt eine Fehlermeldung
else
{
System.out.println("Error. If you need help, type the command -h");
System.exit(0);
}
}
/** Die init_gpio-Methode ist eine schleife die alle rel als output definiert.*/
public static void init_gpio()
{
int idx;
String port;
String cmd;
for(idx = 0; idx<8 ; idx++)
{
port = rel_map[idx][1];
cmd = "/usr/bin/gpio -g mode " + port + " out";
launchcmd(cmd);
}
return;
}
/** Die gpio_getport-Methode vergleicht im rel_map welcher port gesucht ist
* @param port - erster eingabe Wert der CMD Zeile
* @return idx - gibt den idx Wert aus rel_map zurück
* @return -1 - Fehler ausgabe
* */
public static int gpio_getport(String port)
{
int idx;
for(idx = 0; idx<8 ; idx++)
{
if(port.equals(rel_map[idx][0]))
{
return idx;
}
}
return -1;
}
/** Die gpio_cmdhandler-Methode schaltet die Relais an oder aus.
* @param port Relais(1-8)
* @param cmd Aktion (on/off/status)
* */
public static void gpio_cmdhandler(String port, String cmd)
{
int idx_port;
idx_port = gpio_getport(port);
if (cmd.equals(action [0]))
{
//Schalte on
cmd = "/usr/bin/gpio -g write " + rel_map[idx_port][1] + " 1";
launchcmd(cmd);
}
else if (cmd.equals(action [1]))
{
//Schalte off
cmd = "/usr/bin/gpio -g write " + rel_map[idx_port][1] + " 0";
launchcmd(cmd);
}
/*if (cmd.equals(action [2]))
{
//Stats geben
cmd = "/usr/bin/gpio -g write " + port + status();
launchcmd(cmd);
}*/
return;
}
/** Die show_usage-Methode gibt eine Hilfestellung bei falscher Eingabe*/
public static void show_usage()
{
System.out.println("You have to enter exactly 2 arguments.");
System.out.println("Example: java gpio_java Argument1 Argument2");
System.out.println("Argument1: rel1, rel2, rel3, ..., rel8");
System.out.println("Argument2: on,off or status");
}
/** Die launchcmd-Methode führt den Prozess aus.
* @param cmd - erster Eingabe Wert der CMD Zeile */
public static void launchcmd(String cmd)
{
// Wenn Simulation True ist kann sie auf dem PC ausfuehren
// wenn die Simulation false is auf dem Raspberry PI
boolean simulation = false;
if(simulation==true){
System.out.println(cmd);
}
else {
try{
Runtime.getRuntime().exec(cmd);
}
catch(IOException e)
{
System.out.println("process error IOException");
}
}
}
}

241
src/gpio_java.java Normal file
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/**
* @author Alex Volkmann
* @date 18.02.2019
* @function Das programm steuert ein relle an und macht es an oder aus
*/
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
public class gpio_java
{
public static String rel_map [][] = {
{"rel1","14"},
{"rel2","15"},
{"rel3","18"},
{"rel4","23"},
{"rel5","24"},
{"rel6","25"},
{"rel7","8"},
{"rel8","7"}
};
public static String [] action = {"on", "off", "status"};
/** The main method calls the functions in the given order and passes the @param args.
* @param args The passing argument in the commandline.
*/
public static void main (String [] args)
{
// To check the number of arguments
checkargs(args);
// Sets all ports to outputs
init_gpio();
// Sets Gpio (according to the parameters)
gpio_getport(args[0]);
// Turns Gpio on, off or returns status (according to the parameters)
gpio_cmdhandler(args[0], args[1]);
return;
}
/** The checkargs method checks whether two correct arguments have been entered.
* If not, an error message appears.
* @param argumens Commandline argument
*/
public static void checkargs(String[] argumens)
{
int laenge = argumens.length;
String [] h = {"-h"};
int idx;
//Checks if two arguments were given.
if (laenge == 2)
{
//Checks if the first argument is correct.
for (idx = 0; idx<8 ; idx++)
{
if (argumens[0].equals(rel_map[idx][0]))
{
break;
}
}
//Checks if the second argument is correct.
for (idx = 0; idx<3 ; idx++)
{
if (argumens[1].equals(action[idx]))
{
break;
}
}
}
//If there are not two correct arguments then it is tested whether there is an h in it.
//If so, the show_usage function executes.
else if (Arrays.equals (argumens, h) == true)
{
show_usage();
System.exit(0);
}
//If it is a wrong input, an error message will be displayed.
else
{
System.out.println("Error. If you need help, type the command -h");
System.exit(0);
}
}
/** The init_gpio method is a loop that defines all relays as output.*/
public static void init_gpio()
{
int idx;
String port;
String cmd;
for(idx = 0; idx<8 ; idx++)
{
port = rel_map[idx][1];
cmd = "/usr/bin/gpio -g mode " + port + " out";
launchcmd(cmd);
}
return;
}
/** The gpio_getport method searches in the rel_map variable for the correct port and using a loop for this.
* @param port relay(rel1-rel8)
* @return idx returns an index. The index allows access to the array rel_map. If an error occurs in the function, the value -1 is returned.
* */
public static int gpio_getport(String port)
{
int idx;
for(idx = 0; idx<8 ; idx++)
{
if(port.equals(rel_map[idx][0]))
{
return idx;
}
}
return -1;
}
/** The gpio_cmdhandler method switches the relays on, off or returns the status.
* @param port relay(rel1-rel8)
* @param cmd action (on/off/status)
* */
public static void gpio_cmdhandler(String port, String cmd)
{
int idx_port;
idx_port = gpio_getport(port);
if (cmd.equals(action [0]))
{
//Turn on
cmd = "/usr/bin/gpio -g write " + rel_map[idx_port][1] + " 1";
launchcmd(cmd);
}
else if (cmd.equals(action [1]))
{
//Turn off
cmd = "/usr/bin/gpio -g write " + rel_map[idx_port][1] + " 0";
launchcmd(cmd);
}
else
{
//Show status
gpio_read_status(port);
}
return;
}
/** The method checks the status and displays it in the command line.
* @param port the relay board*/
public static void gpio_read_status(String port)
{
int idx_port;
idx_port = gpio_getport(port);
String cmd = "/usr/bin/gpio -g read " + rel_map[idx_port][1];
String response;
response = launchcmd(cmd);
if(response.equals("1"))
{
System.out.println("on");
}
else
{
System.out.println("off");
}
return;
}
/** Die show_usage-Methode gibt eine Hilfestellung bei falscher Eingabe*/
public static void show_usage()
{
System.out.println("gpio_java allows you to control an 8 port relay board.");
System.out.println("Usage: java gpio_java port action");
System.out.println("port: the port indicates which relay is controlled(rel1, rel2, rel3, ..., rel8).");
System.out.println("action: the action indicates which operation will be performed (on = switch relay on,off = switch relay off or status = relay request status).");
System.out.println("");
System.out.println("Example : switch first relais on.");
System.out.println("java gpio_java rel1 on");
System.out.println("");
System.out.println("Example : switch first relais off.");
System.out.println("java gpio_java rel1 off");
System.out.println("");
System.out.println("Example : read status from first relais.");
System.out.println("java gpio_java rel1 status");
}
/** The launchcmd method runs the command.
* @param cmd
* @return retvalue returns a string
* */
public static String launchcmd(String cmd)
{
// If simulation is True it can run on PC
// if the simulation is false on the Raspberry PI
boolean simulation = false;
String line = null;
String retValue = "";
if(simulation==true){
System.out.println(cmd);
}
else {
try{
Process p = Runtime.getRuntime().exec(cmd);
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = in.readLine()) != null) {
retValue += line;
}
}
catch(IOException e)
{
System.out.println("process error IOException");
}
}
return retValue;
}
}