USB_serial.cpp

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/***********************************************************************/
#ifdef _WIN32
#include "USB_serial.h"
#include <stdint.h>
bool open_USB_serial(char *portname) {
  return false;
}
 
bool write_usb_serial(uint8_t *data, unsigned size) {
  return false;
}
 
#else
 
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <stdint.h>
#include "USB_serial.h"
 
int fd;
 
int set_interface_attribs (int fd, int speed, int parity)
{
  struct termios tty;
  if (tcgetattr (fd, &tty) != 0)
      return -1;
 
  cfsetospeed (&tty, speed);
  cfsetispeed (&tty, speed);
 
  tty.c_cflag = (tty.c_cflag & ~CSIZE) | CS8; // 8-bit symbols
  tty.c_iflag &= ~IGNBRK;
  tty.c_lflag = 0;
  tty.c_oflag = 0;
  tty.c_cc[VMIN] = 0;
  tty.c_cc[VTIME] = 5;
 
  tty.c_iflag &= ~(IXON | IXOFF | IXANY); // no XON XOFF
 
  tty.c_cflag |= (CLOCAL | CREAD);   // ignore modem controls + enable reading
  tty.c_cflag &= ~(PARENB | PARODD); // no parity
  tty.c_cflag |= parity;
  tty.c_cflag &= ~CSTOPB;
  tty.c_cflag &= ~CRTSCTS;
 
  if (tcsetattr (fd, TCSANOW, &tty) != 0)
      return -1;
  else
    return 0;
}
 
void set_blocking (int fd, int should_block)
{
  struct termios tty_settings;
  memset (&tty_settings, 0, sizeof tty_settings);
  if (tcgetattr (fd, &tty_settings) != 0)
      return;
 
  tty_settings.c_cc[VMIN] = should_block ? 1 : 0;
  tty_settings.c_cc[VTIME] = 5;    // 5 + 100ms timeout
 
  tcsetattr (fd, TCSANOW, &tty_settings);
}
 
bool open_USB_serial ( char *portname)
{
  fd = open (portname, O_RDWR | O_NOCTTY | O_SYNC);
  if (fd < 0)
      return false;
 
  set_interface_attribs (fd, B115200, 0);
  set_blocking (fd, 0);
 
  return true;
}
 
bool write_usb_serial( uint8_t * data, unsigned size)
{
  if( fd == 0)
    return 0; // silently give up
 
  return 0 == write (fd, data, size);
}
 
#endif