Complete code needs to work in a real-time environment (specifically OROCOS) so I don't really want sleep-like function.Preface: Part 1 covered the sketch the Arduino will run for this example, and part 2 covered the resources and other people’s code I used to make sure everything works as expected. Reported one is only an excerpt of my code. Btw, waiting or usleep() is something I need to avoid. Just for a try, I've created a waiting loop until data is avaliable, but my code never exit the loop. I've tried using select() but nothing happens. I've also tried avoiding the O_NONBLOCK flag on reading, but then I only block until forever. Int USB = open( '/dev/ttyUSB0', O_RDWR| O_NONBLOCK | O_NDELAY ) #include // POSIX terminal control definitions

#include // UNIX standard function definitions Here's my code: #include // standard input / output functions Both commands and response are ASCII characters.Įverything works fine using GtkTerm but, when I switch to C programming, I encounter problems. I need to send those commands and read device's response. I'm working on Linux (Ubuntu).īasically, I am connected to a device which is listening for incoming commands.

I'm trying to send/receive data over an USB Port using FTDI, so I need to handle serial communication using C/C++. Std::cout << 'Response: ' << response << std::endl

Std::cout << 'Read nothing!' << std::endl

Std::cout << 'Error reading: ' << strerror(errno) << std::endl It was definitely not necessary to write byte per byte, also int n_written = write( USB, cmd, sizeof(cmd) -1) worked fine. Open Port int USB = open( '/dev/ttyUSB0', O_RDWR| O_NOCTTY ) I've solved my problems, so I post here the correct code in case someone needs similar stuff.

Linux c serial port example