Problems using "Process" while communicating with Python script

Official Hardware Classic Yún
1

I am using a Python script on the Linino to read an image using PIL and just dumping the values to the 32u4.

The PIL function makes the entire image into a one-dimensional list, which I then print (to be returned to me in the 32u4) using a for loop. However I can't seem to be able to do that, and I believe it is because either the buffer is getting full and is unable to handle the rate at which the Linino end is pumping out data.

How best can I fix this ?

2

Sounds identical to the problem I had: FileIO in binary mode and Process oddities - Arduino Yún - Arduino Forum

It does indeed appear to be a buffering bug in Process.

3

Hmm, maybe. I am sending 16x8x3 (384) bytes though, so I am not even reaching the 65k byte limit. I think it might be because the Atheros processor is sending data much much faster than the 32u4 is receiving..

4

How are you reading the print out from your python script on the 32u4?

5

Process readvalues;
readvalues.runCommand("python script.py");
while (readvalues.available())>0)
{
char c = readvalues.read();
Serial.println(c);
}
delay(5000);

6

ankitdaf:
Process readvalues;
readvalues.runCommand("python script.py");
while (readvalues.available())>0)
{
char c = readvalues.read();
Serial.println(c);
}
delay(5000);

you have syntax error there, should be:

while (readvalues.available() > 0)