output via serial com1

[Joel Sherrill]

http://www.rtems.org/onlinedocs/doc-current/share/rtems/html/c_user/c_user00424.html

|CONFIGURE_LIBIO_MAXIMUM_FILE_DESCRIPTORS| is set to the maximum number 
of files that can be concurrently open. Libio requires a Classic RTEMS 
semaphore for each file descriptor as well as one global one. The 
default value is 3 file descriptors which is enough to support standard 
input, output, and error output.

This is a common user oversight.  To conserve resources, the default is 
very low.

--joel

Simon Clubley wrote:
> On 30/06/2009, lee <funnyvoice at tlabs.ac.za> wrote:
>   
>> Hi... Im trying to output my screen "output" to console via serial cable
>>  on com1.
>>
>>  Here is my Code:
>>
>>  void testCom1(void) {
>>   char buffer[256];
>>
>>   printf("*** Simple COM1 Test (9600 8N1) ***\n");
>>
>>   int fd = open("/dev/ttyS1", O_RDWR | O_NOCTTY | _FNDELAY);
>>
>>     
>
> That's COM2, not COM1. Try /dev/ttyS0.
>
> Simon.
>
>