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GTK+ and IC-7410 (4)

Now the callback function is modified to include the lines for sending a command that relates to the button clicked.

void callback( GtkWidget *widget, gpointer   data ) {
  static char output[128];
  int outputcount;
  static char command_cw    [7] = {0xfe, 0xfe, 0x80, 0xe0, 0x06, 0x03, 0xfd}; /* set mode to CW */
  static char command_cw-rev[7] = {0xfe, 0xfe, 0x80, 0xe0, 0x06, 0x07, 0xfd}; /* set mode to CW-REV */

  if(g_strcmp0((char *) data, "CW") == 0) {
   outputcount = 7; /* command length */
   write(fd, &command_cw, outputcount);
  }
  if(g_strcmp0((char *) data, "CW-REV") == 0) {
   outputcount = 7; /* command length */
  write(fd, &command_cw-rev, outputcount);
  }
}

The above code is not complete, but you can see what I am trying to do.

#define MYRIG "/dev/ttyUSB0"
#define  BAUDRATE B19200

void serial_init(void) {
  struct termios tio;
  memset(&tio, 0, sizeof(tio));
  tio.c_cflag     = CS8 | CLOCAL | CREAD;
  tio.c_cc[VTIME] = 0;
  tio.c_cc[VEOL ] = 0xfd; /* IC-7410 postamble */
  tio.c_lflag     = ICANON;
  tio.c_iflag     = IGNPAR | ICRNL;
  cfsetispeed(&tio, BAUDRATE);
  cfsetospeed(&tio, BAUDRATE);
  tcsetattr  (fd, TCSANOW, &tio);
}
/* main() */
    fd = open(MYRIG, O_RDWR | O_NOCTTY);
    serial_init();

You also need to add the above lines before talking to IC-7410. Lines for error check are omitted for clarity. See CW Keyboard (2) for an complete example.

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Some scale widgets are added.