Hi All,
Is it possible to communicate to Linno directly from outside web client without going through a Sketch ? Is this possible in current Yun Architecture ?
Added to this, Is it possible to perform Restart, Pause and Stop the ATmega32U4 processor from Linnio.
Please direct me to documentation on this.
Thanks in Advance.
Regards,
BREL
HI
you can controll all IO's on the 32u4 side from the linino side via bridge.
i do this in my project.
You can do it with php, phyton ........
And with linino as webserver you can route it to the world 
Hi OttoF,
Thanks for the reply.
From your example,
Understanding is that YunServer is running from the Sketch ( it is initiated inside sketch). Most of Bridge communication is from Sketch Atmeg32U4 to Linino.
But I want an example of Linino talking to Sketch code or Atmega32U4
Is there an example of Bridge.Trasfer() API from linino to Atmega
Thanks
Regards
BREL
you can use the bridgeclient for php
download from here
this php script reads a sql database it runs every minute
and send the commands for io to 32u4
<?php
include_once ("bridgeclient.class.php");
$client = new bridgeclient();
if ($client->get("modus") == "a")
{
$db=new SQLite3("/www/sd/Aqarium/Aquarium.db");
$SQL = "select * from sollwertelicht order by Schaltzeit_ts";
$resultSollwerteLicht = $db->query($SQL);
$Sollwerte[10];
$Dimmzeiten[10];
for ($i = 1; $i <= 9; $i++) {
$Sollwerte[$i] = 0;
$Dimmzeiten[$i] = 0;
}
date_default_timezone_set('Europe/Berlin');
//echo "Uhrzeit ".Date('H:i:s')." TS = ";
$TS = Date('H') * 3600;
$TS = $TS + (Date('i') * 60);
$TS = $TS + Date('s');
while ($SollwerteLicht = $resultSollwerteLicht->fetchArray()){
if ($TS >= $SollwerteLicht[Schaltzeit_ts])
{
$Sollwerte[$SollwerteLicht[Kanalnummer]] = round($SollwerteLicht[Sollwert]*2.54);
$Dimmzeiten[$SollwerteLicht[Kanalnummer]]= $SollwerteLicht[Dimmzeit];
}
}
for ($i = 1; $i <= 9; $i++) {
$Senden = $Senden.$i."#".$Senden.str_pad($Sollwerte[$i], 3, "0", STR_PAD_LEFT)."#".str_pad($Dimmzeiten[$i], 3, "0", STR_PAD_LEFT)."#";
$client->put("command",$Senden);
$Senden = "";
usleep(100000); // 100000 µsec = 100 ms
}
}
?>
and here my code from 32u4 to work with the datas from linino side
see the bridge.get and bridge.put commands
#include <Bridge.h>
#include <string.h>
#include <Process.h>
char data_r[11];
String Dummy = String(11);
String puffer = String(11);
int Kanal;
int datenlaenge;
int Fehlerzaehler;
int p_datenlaenge;
String istwerte;
String last_istwerte;
String Wert[10];
String Dimmzeit[10];
float Sollwert[10];
float LetzterSollwert[10];
float DiffSollwert[10];
float Regelwert[10];
float Dimmfaktor[10];
int KanalPin[8];
int SDimmzeit;
float FDimmzeit;
unsigned long time1;
unsigned long time2;
boolean sekundenimpuls;
void setup() {
KanalPin[1] = 3;
KanalPin[2] = 5;
KanalPin[3] = 6;
KanalPin[4] = 9;
KanalPin[5] = 10;
KanalPin[6] = 11;
KanalPin[7] = 13;
pinMode(13,OUTPUT);
pinMode(11,OUTPUT);
pinMode(10,OUTPUT);
pinMode(9,OUTPUT);
pinMode(6,OUTPUT);
pinMode(5,OUTPUT);
pinMode(3,OUTPUT);
pinMode(A0, INPUT_PULLUP);
pinMode(A1, OUTPUT);
pinMode(A2, OUTPUT);
pinMode(A3, OUTPUT);
pinMode(A4, OUTPUT);
pinMode(A5, OUTPUT);
digitalWrite(A5,HIGH);
Bridge.begin();
digitalWrite(A5,LOW);
delay(1000);
Bridge.put("handshake", "Bridge ok");
delay(500);
time1 = millis();
time2 = time1;
Process p;
p.runShellCommand("/usr/bin/php-cli /www/sd/Aqarium/Automatik_cron.php");
}
void loop() {
time1 = millis();
if(time1 < time2){time2 = time1;}
if ((time1 - time2) > 1000){sekundenimpuls = true; time2 = time1;}
digitalWrite(A5,LOW);
p_datenlaenge = Bridge.get("command",data_r,11); // kommt von Automatik_cron.php oder Manuell.php
delay(10);
digitalWrite(A5,HIGH);
puffer = data_r;
datenlaenge = puffer.length();
if (datenlaenge > 0 && datenlaenge != 10)
{
Fehlerzaehler = Fehlerzaehler + 1;
Bridge.put("handshake", puffer + " Laenge " + String(datenlaenge) + " Fehlerx " + String(Fehlerzaehler) + " millis " + String(time1));
delay(10);
}
if (datenlaenge == 10 ) // Neue Sollwerte übernehmen
{
Dummy = strtok(data_r,"#");
Kanal = stringTOint(Dummy);
Dummy = strtok(NULL,"#");
Wert[Kanal] = Dummy;
Dummy = strtok(NULL,"#");
Dimmzeit[Kanal] = Dummy;
LetzterSollwert[Kanal] = Sollwert[Kanal];
Sollwert[Kanal] = stringTOint(Wert[Kanal]);
if(LetzterSollwert[Kanal] > Sollwert[Kanal])
{
DiffSollwert[Kanal] = LetzterSollwert[Kanal] - Sollwert[Kanal];
}
if(LetzterSollwert[Kanal] < Sollwert[Kanal])
{
DiffSollwert[Kanal] = Sollwert[Kanal] - LetzterSollwert[Kanal];
}
SDimmzeit = stringTOint(Dimmzeit[Kanal]);
FDimmzeit = float(SDimmzeit);
if (SDimmzeit > 0)
{
Dimmfaktor[Kanal] = DiffSollwert[Kanal] / (FDimmzeit * 60);
}else{
Regelwert[Kanal] = Sollwert[Kanal];
}
Bridge.put("command","");
delay(10);
}
// Regelung PWM
if (sekundenimpuls)
{
for(int i = 1; i <=7; i++)
{
if (Regelwert[i] < Sollwert[i])
{
if (Regelwert[i] + Dimmfaktor[i] > Sollwert[i])
{
Regelwert[i] = Sollwert[i];
}else{
Regelwert[i] = Regelwert[i] + Dimmfaktor[i];
}
}
if (Regelwert[i] > Sollwert[i])
{
if (Regelwert[i] - Dimmfaktor[i] < Sollwert[i])
{
Regelwert[i] = Sollwert[i];
}else{
Regelwert[i] = Regelwert[i] - Dimmfaktor[i];
}
}
analogWrite(KanalPin[i],int(Regelwert[i]));
}
}
// Netzteile ein für Regelkanäle
if (int(Regelwert[1]) > 0 || int(Regelwert[2]) > 0 || int(Regelwert[3]) > 0)
{digitalWrite(A1,HIGH);}else{digitalWrite(A1,LOW);}
if (int(Regelwert[4]) > 0 || int(Regelwert[5]) > 0 || int(Regelwert[6]) > 0 || int(Regelwert[7]) > 0)
{digitalWrite(A2,HIGH);}else{digitalWrite(A2,LOW);}
// Schaltkanäle
if (int(Sollwert[8]) > 0 )
{digitalWrite(A3,HIGH);}else{digitalWrite(A3,LOW);}
if (int(Sollwert[9]) > 0 )
{digitalWrite(A4,HIGH);}else{digitalWrite(A4,LOW);}
// Istwertausgabe
istwerte = "";
for(int i = 1; i <=9; i++)
{
istwerte = istwerte + String(map(Regelwert[i],0,254,0,100))+ "#";
}
if (last_istwerte != istwerte)
{
last_istwerte = istwerte;
Bridge.put("istwerte",istwerte);
delay(10);
}
/*
if(p_datenlaenge > 0)
{
Bridge.put("datenlaenge",String(p_datenlaenge));
delay(10);
}
*/
sekundenimpuls = false;
}
// +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
int stringTOint(String wert)
{
char carray[wert.length() + 1]; //determine size of the array
wert.toCharArray(carray, sizeof(carray)); //put Stringinto an array
int erg = atoi(carray); //convert the array into an Integer
return erg;
}
Super.
Thank you very much OttoF
Regards
BREL
As far as restart, stop and start control the documentation is the schematic for the Yun which is here:
Combined with some info on how to use the gpio's which I found here:
WARNING This is low level stuff, there are few if any protections if you do stupid things with gpio's. For instance I don't know what would happen if you set a gpio to output when it is wired as a input. It is quite possible you would burn it out if you set it low on the software side while it was held high by the connected hardware. The AR9331 datasheet might give this information. Don't go blindly monkeying around with the gpio's
So, we know that gpio18 is hooked to the 32U4 reset line. To set it up for output you need to:
echo 18 > /sys/class/gpio/export
echo out>/sys/class/gpio/gpio18
To stop the 32U4, pull the reset high
echo 1>/sys/class/gpio/gpio18
To start it again, pull the reset low
echo 0>/sys/class/gpio/gpio18
and a restart would be a stop and start combined
echo 1>/sys/class/gpio/gpio18
echo 0>sys/class/gpio/gpio18
If you are going to be doing this much you would probably want to make scripts to perform these functions.
I don't see a mechanism to pause/continue.
Cool.
Thank you very much NoblePepper.
Much appreciated
Kind Regards
Srini Murthy
You can also reset the mcu from the linino side with the reset-mcu command.
I should have remembered that, it would have saved me some research on how to make gpio's work, duh.
It's a premade script to do what I did the hard way:
#!/bin/sh
echo 18 > /sys/class/gpio/export
echo "high" > /sys/class/gpio/gpio18/direction
echo 1 > /sys/class/gpio/gpio18/value
echo 0 > /sys/class/gpio/gpio18/value
echo 18 > /sys/class/gpio/unexport
Hi NoblePepper and Newline,
Thank you very much for the reply
I donot see gpio18 directory under /sys/class/gpio/. All I have is : export, gpio21, gpio22, gpio23, gpiochip0, and unexport directories. Am I missing some thing here. ( kindly see the image attached)
similar to reset-mcu: Is there a command for just stop and pause.
Thanks and Regards
BREL
Hi NoblePepper and Newline,
Sorry, I did not read the first line
echo 18 > /sys/class/gpio/export. This creates gpio18 directory.
Regarding reset-mcu is there a one for stop
Thanks
BREL
Hi NoblePepper,
You mentioned these commands :
echo 1>/sys/class/gpio/gpio18
echo 0>sys/class/gpio/gpio18
You meant these right
echo 1>/sys/class/gpio/gpio18/value
echo 0>sys/class/gpio/gpio18/value
Please confirm
Thanks
BREL
Yes, the proper commands are
echo 1>/sys/class/gpio/gpio18/value
echo 0>sys/class/gpio/gpio18/value
, bad/lazy typing on my part.
For the script, I'll call it stop-mcu, start a console session on the Yun use either PuTTY on windows or picocom on linux.
Once you are in do this:
cd /usr/bin
cp reset-mcu stop-mcu
vim stop-mcu
delete the line that starts with echo 0 and save the file
If you aren't familiar with vim a lot of people find nano easier to work with, just opkg install nano and use it.
I think to "pause" a running sketch on the Leonardo side you need to get into the world of hardware debuggers using JTAG.
NoblePepper,
Thank you so much for all your help.
I am truly grateful,
regards
BREL