propellor c USb connection

Patrick222122

I am having trouble having the propeller communicating with the pi, which is critical for my project. I have had success with transmitting from the propellor c to the pi using Libfd_serail writeStr function but cannot get the propeller to read from the pi. I have tried how it is done in the demo code but still come up empty. As always working demo code would be appriciated.

mindrobots

What are you talking to on the Pi side?

Does the demo you are using provide code for boyh sides of the connection?

Can you post the demo code?

Patrick222122

replying to the previous post here are the two programs for the usb. First the propellor c code

/*
  Blank Simple Project.c
  http://learn.parallax.com/propeller-c-tutorials 
*/
#include "simpletools.h"                      // Include simple tools
#include "simpletext.h"
#include "fdserial.h"


int main()                                    // Main function
{
  // Add startup code here.
  fdserial *term = fdserial_open(31,30,0,115200);
 char datai,datao;
int toob;
//this portion here I took from the demo program
    readStr(term, datai, 80);
    sscan(datai,"%s",datao);


writeStr(term, datao);
pause(1000);
 
}

and now the python code

import serial


ser=serial.Serial("/dev/ttyUSB0",115200)
while(True):
    inpt=raw_input("enter a number")
    ser.write(inpt)
    outpt=ser.read()
    print outpt
    

Ps: I have used this python code before when I was using spin so I know it works

FredBlais

Hi Patrick,

I've done serial communication a couple of time between Prop and Pi, using Spin and Python.
Are you sure that your serial port is on /dev/ttyUSB0 ?
I used ser = serial.Serial("/dev/ttyAMA0",115200)

jazzed

If you need fdserial.h with simple libraries, you have to play a game with the default port pointer (dport_ptr). See below.

#include "simpletools.h"                      // Include simple tools
#include "fdserial.h"

int main()                                    // Main function
{
  // Add startup code here.
  extern text_t *dport_ptr;                   // default port pointer
  char datai[80];                             // an array of char i.e. a string

  simpleterm_close();                         // close the default port
  dport_ptr = fdserial_open(31,30,0,115200);  // get a new default port pointer

  putStr("Enter some text: ");                // prompt
  getStr(datai, 80);                          // get some data
  putLine(datai);                             // print some data
  putLine("All done");                        // program over, go relax.
}