[ECOS] read com0 on e7t

Bob Koninckx bob.koninckx@mech.kuleuven.ac.be
Fri May 16 12:28:00 GMT 2003


Where does it block ? Isn't it just "waiting" for input to come in on
the serial interface, 'cause that would be normal behaviour. What
happens when data effectively comes in ?

Bob


On Fri, 2003-05-16 at 14:18, F.T.Nilsson@hw.ac.uk wrote:
> Hi,
> 
> I have an application which reads on com0 on e7t and eventhoughthe message 
> is a bit strang it works. However I want to poll com0 until a message is 
> sent so I put the cyg_io_read(..) in a loop but the program hangs when 
> entering this function (due to the loop).
> 
> can anyone help me?
> 
> cheers
> 
> Fred
> 
> static void poll_com0(CYG_ADDRESS data)//
> {
>    Cyg_ErrNo err;
>    printf("in poll_com0");
> 	
>     char mybuff[100];
>     cyg_uint32 len2 = strlen(mybuff);	
>     
> while(len2 == 0)
> {
>     err= cyg_io_read(handle_ser0, mybuff , &len2 );
>     len2 = strlen(mybuff);
> }	
> 	
>   if (ENOERR == err) {
>     printf(" read on ser0\n");
>     printf("Mybyff = %s\n", mybuff[0]);
>   }
> 
> }
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ir. Bob Koninckx
Katholieke Universiteit Leuven       
Division Production Engineering,                   tel.  +32 16 322535
Machine Design and Automation                      fax.  +32 16 322987
Celestijnenlaan 300B                  bob.koninckx@mech.kuleuven.ac.be
B-3001 Leuven Belgium               http://www.mech.kuleuven.ac.be/pma
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