[ECOS] Runtime changing of serial port baud rate

[ECOS] Runtime changing of serial port baud rate

[Ho Shui Choy Stanley PS03B NCS]

Does eCos support runtime changing of serial port baud rate?

Thanks
Stanley
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Re: [ECOS] Runtime changing of serial port baud rate

[Jesper Skov]

>>>>> "Jonathan" == Jonathan Larmour <jlarmour@redhat.com> writes:

Jonathan> Jesper, I'd be interested in what
Jonathan> CYGACC_CALL_IF_SET_SERIAL_BAUD() is for in the case. Just
Jonathan> "legacy" CygMon stuff and should be ignored?

Yes, exactly. We should weed out the unused legacy entries as we
decided back in Jan but since it doesn't really break anything it's
been on the backburner...

Jesper

Re: [ECOS] Runtime changing of serial port baud rate

[Jonathan Larmour]

rob.wj.jansen@philips.com wrote:
> 
> Stanley,
> 
> > Does eCos support runtime changing of serial port baud rate?
> >
> > Thanks
> > Stanley
> 
> Yes, but only if you use the serial driver instead of the diagnostics I/O.
> Look at the chapters 11 and 12 in the eCos Reference Manual.

In a small number of cases it's also true for the diagnostic I/O. Gary
Thomas recently added this for sa11x0 diag. You would need to include
<cyg/hal/hal_if.h> and use CYGACC_COMM_IF_CONTROL(). You can see an example
in redboot/current/src/main.c:set_console_baud_rate().

Jesper, I'd be interested in what CYGACC_CALL_IF_SET_SERIAL_BAUD() is for
in the case. Just "legacy" CygMon stuff and should be ignored?

Jifl
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Re: [ECOS] Runtime changing of serial port baud rate

[rob.wj.jansen]

Stanley,

> Does eCos support runtime changing of serial port baud rate?
>
> Thanks
> Stanley

Yes, but only if you use the serial driver instead of the diagnostics I/O.
Look at the chapters 11 and 12 in the eCos Reference Manual.

Setting the baudrate involves some magic with the cyg_io_***_config functions:

    cyg_io_handle_t      ser_handle;
    cyg_io_serial_info_t ser_info;

    cyg_io_lookup("/dev/ser1", &ser_handle);
    cyg_io_get_config(ser_handle, CYG_IO_GET_CONFIG_SERIAL_INFO, &ser_info, sizeof(ser_info));

    ser_info.baud        = CYGNUM_SERIAL_BAUD_110;
    ser_info.word_length = CYGNUM_SERIAL_WORD_LENGTH_7;

    cyg_io_set_config(ser_handle, CYG_IO_SET_CONFIG_SERIAL_INFO, &ser_info, sizeof(ser_info));

You might want to add the obvious #include lines, checks for the error values returned and
maybe some other baudrate figures (but these ones enable you to use your old mechanical TTY ;-)

Cheers,

	Rob