2009-08-24 04:21:35     SPORT emulated UART -> How to send a Break

2009-08-24 04:21:35     SPORT emulated UART -> How to send a Break

Claudio Cunha (SWITZERLAND)

Message: 79151   

Hi All,

I'm using a BF533-Ezkit board and Linux blackfin with a SPORT0 emulated UART for transmiting and receiving hex values to a board.

My Kernel version is :

kernel:    Linux release 2.6.28.9-ADI-2009R1-pre-gb4ee7d3-dirty, build #38 Tue Jul 14 15:13:31 CEST 2009

toolchain: bfin-linux-uclibc-gcc release gcc version 4.1.2 (ADI svn)

user-dist: release 2008R1, build #12 Thu Jul 9 13:53:31 CEST 2009

And my values are sent  in  /dev/ttySS0.

How can I send a break over the sport emulated uart port ???

Because  function sport_break_ctl is empty  -> See under :

static void sport_break_ctl(struct uart_port *port, int break_state)

{

    pr_debug("%s enter\n", __func__);

}

Let me know your suggestions how can I resolve this problem.

Thanks a lot.

With Regards,

Claudio Cunha

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2009-08-24 04:24:09     Re: SPORT emulated UART -> How to send a Break

Claudio Cunha (SWITZERLAND)

Message: 79152   

A Uart Break is frame that  all the bits are at low level  (the start bit, the frame, and the stop bit) . It's 10bits at low level...

Thanks,

Claudio

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2009-08-24 04:42:38     Re: SPORT emulated UART -> How to send a Break

Sonic Zhang (CHINA)

Message: 79153   

BREAK is not implemented in sport_uart.c yet. You can do it by keeping feeding zero to sport TX fifo.

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2009-08-24 05:13:28     Re: SPORT emulated UART -> How to send a Break

Claudio Cunha (SWITZERLAND)

Message: 79155   

Thanks Sonic to respond me!

But how can I make to keeping feeding zero to sport TX fifo ?  What function do I change it for that?

Thanks a lot !

Best regards,

Claudio

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2009-08-24 05:32:35     Re: SPORT emulated UART -> How to send a Break

Sonic Zhang (CHINA)

Message: 79157   

You have to

1. add a break_state flag into struct sport_uart_port.

2. add a function tx_one_break to write 0s and end word 0xffff to sport tx fifo.

3. start first break 0 and set proper break_state flag in function break_ctl.