Re: [ECOS] UART communication

["Dave Airlie" <airlied@parthus.com>]

With eCos on the ARM AEB you cannot choose 57600, I up came against
something similiar a while back.. check the return from
cyg_io_set_config I found it by tracing the code ...

I think you can use a different clock multiplier to get 57600 but it
involves changing eCos code...

Dave.


On Tue, 5 Sep 2000 Andreas.Karlsson@combitechsystems.com wrote:

> Hi,
> 
> While receiving several bytes on the UART0 port on my AEB-board the
> eCos-serialdriver says it only received 1 byte with the value of 0.
> 
> The incoming data looks very nice on an oscilloscope. 
> 
> Just to be sure that I hadn't messed something up in my receiver-thread I
> connected the TX and the RX pin and sent 4 bytes, the packet was received
> just as it should.
> 
> 
> 
> I compiled the ser0 with a baud rate of 57600 since that's the only one I
> can use. The other settings are 1 stop bit, no parity, wordsize=8 and
> CTS/RTS enabled.
> 
> I noticed that the baudrate of 57600 wasn't supported in aeb_serial.h but
> what happens when I make this selection in the configuration?
> 
> To be able to enable CTS/RTS I had to modify the select_baud-array in
> aeb_serial.h. This because I should be able to set all fields in the
> cyg_serial_info_t struct. I added the value of 26 on the bauddivisor for
> 57600, maybe this is the problem.
> 
> I really don't know what could be wrong so if anybody has a clue...
> 
> /Andreas
> 

-- 
      David Airlie, Software Engineer, Parthus Technologies plc.,
       Mary Rosse Centre, National Tech Park, Limerick, Ireland.
   t: +353-61-508116 / f: +353-61-508101 / David.Airlie@parthus.com