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Tuesday, November 16, 2010

Pinguino CDC and Processing

Hi guys,

On linux, we have some problems to use the Serial object to communicate with Pinguino CDC.
Unfortunately, the RXTXbin module of JAVA don't recognize the /dev/ttyACM0 port.
I found a solution to fix this problem, and a simple working example is detailed here.

Create a symbolic link from /dev/ttyACM0 to a more popular name for a serial device ( i chose /dev/ttyS20 )

sudo ln -s /dev/ttyACM0 /dev/ttyS20

Now the Pinguino side of my fantastic application !!
// Pinguino cdc with processing
// Jean-Pierre Mandon 2010

unsigned char i;

void setup()
{
for (i=0;i<4;i++)
{
pinMode(i,OUTPUT);
digitalWrite(i,LOW);
}
}

unsigned char receivedbyte;
unsigned char rxstr[64];

void loop()
{
// Use the run led to check if a terminal is connected
if (CONTROL_LINE) PORTAbits.RA4=1;
else PORTAbits.RA4=0;

// receive a string from the USB uart and send it on the uart
receivedbyte=CDC.read(rxstr);
if (receivedbyte>0)
{
rxstr[receivedbyte]=0; // to make received character(s) a string
switch (rxstr[0])
{
case 'S':switch(rxstr[1]) // SET
{
case '0': digitalWrite(0,HIGH); // Pin 0 ON
break;
case '1': digitalWrite(1,HIGH); // Pin 1 ON
break;
case '2': digitalWrite(2,HIGH); // Pin 2 ON
break;
case '3': digitalWrite(3,HIGH); // Pin 3 ON
break;
}
break;
case 'R':switch(rxstr[1]) // RESET
{
case '0': digitalWrite(0,LOW); // Pin 0 OFF
break;
case '1': digitalWrite(1,LOW); // Pin 1 OFF
break;
case '2': digitalWrite(2,LOW); // Pin 2 OFF
break;
case '3': digitalWrite(3,LOW); // Pin 3 OFF
break;
}
break;
}
}
}
The processing side assume that /dev/ttyS20 is used as the first serial port:
import processing.serial.*;

Serial myPort;
String port[];
int i;

void setup()
{
port=Serial.list();
println(port[0]);
myPort=new Serial(this,port[0],115200);
}

void draw()
{
for (i=0;i<4;i++)
{
myPort.write("S"+str(i));
delay(50);
myPort.write("R"+str(i));
delay(50);
}
}

void stop()
{
myPort.stop();
}

And now the schematic:


Have fun
Jean-Pierre

4 comments:

Juan Pablo Toledo said...

Excelente, cuando vuelva a casa estaré dándole una prueba. Gracias por ese ejemplo. Salud!

Henrik said...

Was having the same problem, the solution was so simple :)

David Mendez said...

It works!!!, but I have the same problem in Windows, does anyone knows how to resolve it ?

ricardo lara said...

hello, and look what the library could do with hypermedia http://www.youtube.com/watch?v=fDDPt6Aa1Q4 , but I wanted to control servos and could not, I need help, thank you very much.