hd44780-serial.c

Hello all,
I have a rather unusual setup with an XBee on /dev/ttyUSB0 connected to a
remote display which uses hd44780-serial.c as the driver.

I have noticed that the display gets messed up from time to time, as if
characters are being dropped or lost in transmission. Browsing the driver,
I notice that the return value from write is ignored, so I replaced all
calls to write with a do_write function like this:

static void do_write(int fd, const unsigned char *c, int n)
 {
  while (n > 0) {
  int wrote = write(fd, c, n);
  if (wrote > 0)
  n -= wrote;
  else {
  perror("write");
  break;
  }
  }
}

With this in place, I see a ton of EAGAIN errors which would certainly
account for the dropped characters, right?

Would the list accept a patch for this file? (I note that most drivers have
the same problem...)

Steve

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