Android Question GPIO under Basic4Android

[Drew75]

Hi everybody!!!

I have purchased a A20 Olinuxino MICRO board with GPIO.
I want to use GPIO under Basic4Android but I cant how to do that.

Olimex Help say:
*) GPIO using Android SDK
Basicly you should read and write to the filesys. Make sure that
your app is running as root, or else nothing will happen.
The demo program toggle LED1 on every button press.
All read/write methods are realized in GPIO.java file.

is posssible read/write filesys from Basic4Android???
This is GPIO.java code:

package olimex.a10s.toogleled;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;



public class GPIO{
   
    public String port;
    public String ext;
    public int pin;   
   
   
    public boolean output(int value) {
        String command = String.format("echo %d > /sys/class/gpio_sw/%s/data", value, port);       
        try {
            Runtime.getRuntime().exec(new String[] {"su", "-c", command});
            return true;
        } catch (IOException e) {
            return false;
        }
    }
    public String readinput(){
        Process p;
        String command = String.format("cat /sys/class/gpio_sw/%s/data", port);
        try {
            p = Runtime.getRuntime().exec(new String[] {"su", "-c", command});
            BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
            StringBuilder text = new StringBuilder();
            String line;
            while((line = reader.readLine()) != null){
                text.append(line);
                text.append("\n");
            }
            return text.toString();
        } catch (IOException e) {
            return "";
        }       
    }
    public boolean setcfg(int cfg){
        String command = String.format("echo %d > /sys/class/gpio_sw/%s/mul_sel", cfg, port);       
        try {
            Runtime.getRuntime().exec(new String[] {"su", "-c", command});
            return true;
        } catch (IOException e) {
            return false;
        }
    }
    public String readcfg(){
        Process p;
        String command = String.format("cat /sys/class/gpio_sw/%s/mul_sel", port);
        try {
            p = Runtime.getRuntime().exec(new String[] {"su", "-c", command});
            BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));
            StringBuilder text = new StringBuilder();
            String line;
            while((line = reader.readLine()) != null){
                text.append(line);
                text.append("\n");
            }
            return text.toString();
        } catch (IOException e) {
            return "";
        }
    }
    public int input(){       
        char ch;
        String cfg;
       
        cfg = readinput();
       
        if(cfg.isEmpty())
            return -1;
        else{
            ch = cfg.charAt(0);       
            if(Character.isDigit(ch))
                return Character.getNumericValue(ch);           
            else
                return -1;
        }   
    }
   
    public int getcfg(){
        char ch;
        String cfg;
       
        cfg = readcfg();
        if(cfg.isEmpty())
            return -1;
        else{
            ch = cfg.charAt(0);
            if(Character.isDigit(ch))
                return Character.getNumericValue(ch);           
            else
                return -1;
        }
    }
   
   
    //Constructor
    public GPIO(String port, String ext, int pin){
        this.port = port;
        this.ext = ext;
        this.pin = pin;
    }
       
}

If someone can help me with this...really I would appreciate it.
Andres

 

[Erel]

See this link: Running shell commands as SuperUser

 

[arge06]

Hi Drew75, did you manage to use gpio's ? Many years ago, in old qbasic, we were using peek and poke commands to read and write memory adresses. there must be something like this for gpio's.