[ECOS] polled serial

[ECOS] polled serial

[Andy Simpkins]

Hi there,

Assuming that I have understood things properly, cyg_io_read is a blocking
function, i.e. once called it will only return when characters have been
received from the serial port.   Is there another function available to
either return the amount of data currently held in the receive buffer (the
eCos serial buffer NOT that of the UART) or a non blocking read function
(i.e. returns NULL if there is nothing currently in the serial buffer)?

Kind regards

Andy

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Re: [ECOS] polled serial

[Andrew Lunn]

On Fri, Jun 01, 2001 at 12:33:23PM +0100, Andy Simpkins wrote:
> Hi there,
> 
> Assuming that I have understood things properly, cyg_io_read is a blocking
> function, i.e. once called it will only return when characters have been
> received from the serial port.   Is there another function available to
> either return the amount of data currently held in the receive buffer 

Try this


{
  cyg_serial_buf_info_t bufinfo;
  cyg_uint32 len;
  
  len = sizeof(bufinfo);  
  cyg_io_get_config(port_handle, CYG_IO_GET_CONFIG_SERIAL_BUFFER_INFO, 
                    &bufinfo, &len); 
      
  return bufinfo.rx_count;
} 

        Andrew

Re: [ECOS] polled serial

[Jesper Skov]

>>>>> "Andy" == Andy Simpkins <Andy.Simpkins@TardisMobile.com> writes:

Andy> Hi there, Assuming that I have understood things properly,
Andy> cyg_io_read is a blocking function, i.e. once called it will
Andy> only return when characters have been received from the serial
Andy> port.  Is there another function available to either return the
Andy> amount of data currently held in the receive buffer (the eCos
Andy> serial buffer NOT that of the UART) or a non blocking read
Andy> function (i.e. returns NULL if there is nothing currently in the
Andy> serial buffer)?

Set the non-blocking property of the device. See the serial tests for
examples, or consult the documentation...

Jesper

RE: [ECOS] polled serial

[Andy Simpkins]

Jesper,
Looking in both the documentation and the serial tests I am afraid I can not
find any
reference to the non-blocking property.

The tests I am looking at are serial1.c through serial5.c, tty1.c & tty2.c
in packages\io\serial\v1_3_1\tests
The documentation I searched was 'eCos 1.3.1 Documentation'

Can please point me to where I should be looking?

Andy

> -----Original Message-----
> From: jskov@thinktwice.zoftcorp.adsl.dk
> [ mailto:jskov@thinktwice.zoftcorp.adsl.dk]On Behalf Of Jesper Skov
> Sent: 01 June 2001 13:06
> To: Andy.Simpkins@TardisMobile.com
> Cc: eCos Disuss
> Subject: Re: [ECOS] polled serial
>
>
> >>>>> "Andy" == Andy Simpkins <Andy.Simpkins@TardisMobile.com> writes:
>
> Andy> Hi there, Assuming that I have understood things properly,
> Andy> cyg_io_read is a blocking function, i.e. once called it will
> Andy> only return when characters have been received from the serial
> Andy> port.  Is there another function available to either return the
> Andy> amount of data currently held in the receive buffer (the eCos
> Andy> serial buffer NOT that of the UART) or a non blocking read
> Andy> function (i.e. returns NULL if there is nothing currently in the
> Andy> serial buffer)?
>
> Set the non-blocking property of the device. See the serial tests for
> examples, or consult the documentation...
>
> Jesper
>

RE: [ECOS] polled serial

[Jesper Skov]

>>>>> "Andy" == Andy Simpkins <Andy.Simpkins@TardisMobile.com> writes:

Andy> Jesper, Looking in both the documentation and the serial tests I
Andy> am afraid I can not find any reference to the non-blocking
Andy> property.

Andy> The tests I am looking at are serial1.c through serial5.c,
Andy> tty1.c & tty2.c in packages\io\serial\v1_3_1\tests The
Andy> documentation I searched was 'eCos 1.3.1 Documentation'

Andy> Can please point me to where I should be looking?

Ah, sorry. This is a feature only available in the CVS sources (and
online documentation).

Jesper

RE: [ECOS] polled serial

[Andy Simpkins]

Hi there Andrew
ummm, looks like I am using a greatly outdated version of eCOS,
cyg_serial_info_t is not found anywhere on my machine!

NT 4, cygwin, eCos 1.3.1
Custom Hardware, ARM7TDMI Core

Andy

> -----Original Message-----
> From: Andrew Lunn [ mailto:andrew.lunn@ascom.ch ]
> Sent: 01 June 2001 12:43
> To: Andy Simpkins
> Cc: eCos Disuss
> Subject: Re: [ECOS] polled serial
>
>
> On Fri, Jun 01, 2001 at 12:33:23PM +0100, Andy Simpkins wrote:
> > Hi there,
> >
> > Assuming that I have understood things properly, cyg_io_read is
> a blocking
> > function, i.e. once called it will only return when characters have been
> > received from the serial port.   Is there another function available to
> > either return the amount of data currently held in the receive buffer
>
> Try this
>
>
> {
>   cyg_serial_buf_info_t bufinfo;
>   cyg_uint32 len;
>
>   len = sizeof(bufinfo);
>   cyg_io_get_config(port_handle, CYG_IO_GET_CONFIG_SERIAL_BUFFER_INFO,
>                     &bufinfo, &len);
>
>   return bufinfo.rx_count;
> }
>
>         Andrew
>