Re: [Bluez-devel] ttyS0 problem

[Marcel Holtmann <marcel@holtmann.org>]

Hi David,

> 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?

after step 1, you  must use the HCI raw socket to send commands. What
commands do you wanna send?

Regards

Marcel




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