serval-dna/overlay_packetradio.c

#include "serval.h"
#include "conf.h"
#include <termios.h>

int overlay_packetradio_setup_port(overlay_interface *interface)
{
  struct termios t;

  tcgetattr(interface->alarm.poll.fd, &t);
  cfsetspeed(&t, interface->uartbps);

  // 8N1
  t.c_cflag &= ~PARENB;
  t.c_cflag &= ~CSTOPB;
  t.c_cflag &= ~CSIZE;
  t.c_cflag |= CS8;

  t.c_lflag &= ~(ICANON | ISIG | IEXTEN | ECHO | ECHOE);
  /* Noncanonical mode, disable signals, extended
   input processing, and software flow control and echoing */
  
  t.c_iflag &= ~(BRKINT | ICRNL | IGNBRK | IGNCR | INLCR |
		 INPCK | ISTRIP | IXON | IXOFF | IXANY | PARMRK);
  /* Disable special handling of CR, NL, and BREAK.
   No 8th-bit stripping or parity error handling.
   Disable START/STOP output flow control. */
  
  // Enable/disable CTS/RTS flow control
#ifndef CNEW_RTSCTS
  if (interface->ctsrts) t.c_cflag |= CRTSCTS;
  else t.c_cflag &= ~CRTSCTS;
#else
  if (interface->ctsrts) t.c_cflag |= CNEW_RTSCTS;
  else t.c_cflag &= ~CNEW_RTSCTS;
#endif

  // no output processing
  t.c_oflag &= ~OPOST;

  tcsetattr(interface->alarm.poll.fd, TCSANOW, &t);
  
  // Ask radio to report RSSI
  (void)write_all(interface->alarm.poll.fd,"\r",1);
  usleep(1200000);
  (void)write_all(interface->alarm.poll.fd,"+++",3);
  usleep(1200000);
  (void)write_all(interface->alarm.poll.fd,"\rAT&T\rAT&T=RSSI\rATO\r",20);
  if (config.debug.packetradio) {
    tcgetattr(interface->alarm.poll.fd, &t);
    int in_speed=cfgetispeed(&t);
    int out_speed=cfgetospeed(&t);

    DEBUGF("Enabled RSSI reporting for RFD900 radios");
    DEBUGF("Sent ATO to make sure we are in on-line mode");
    DEBUGF("uart speed reported as %d/%d",in_speed,out_speed);
  }
  
  if (0){
    // dummy write of all possible ascii values
    char buff[256];
    int i;
    for (i=0;i<sizeof buff;i++)
      buff[i]=i;
    (void)write_all(interface->alarm.poll.fd,buff,sizeof buff);
  }
  
  set_nonblock(interface->alarm.poll.fd);

  return 0;
}