[Bluez-devel] ttyS0 problem

["davidgchen" <gangchen@mobilesoft.com.cn>]

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Hi marcel,

I want to write some commands to the uart(ttyS0), but it fails. The steps are as follows:

1. hciattach ttyS0 texas
2. Open ttyS0 device again and get a fd, init ttyS0 with speed, flow_ctl and so on,then write a command(0x30) to the fd but return 0; That is nothing is written to ttyS0.

If I write the same command  in the  function texas(int fd, struct uart_t *u, struct termios *ti), it succeeds.
From bluez-utiles I see the following code which maybe the reason why I can't write the command to ttyS0 after running hciattach ttyS0 texas.

/* Set TTY to N_HCI line discipline */
 i = N_HCI;
 if (ioctl(fd, TIOCSETD, &i) < 0) {
  perror("Can't set line discipline");
  return -1;
 }

It seems the codes is very important ,because if I delete these codes, the following codes can't run any more.

Is there any method that I can write the command to the ttyS0 successfully after step 1?

regurds,

David

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