Serial port issues

[Sebastian Huber]

On 07/08/2019 23:13, Michel Macena wrote:
> just to update, I've tried different ways to get something from the 
> serial port.
> when  i use open (from unistd.h) to open the serial port it returns "-1".I
> also tried the getchark() function from 
> https://github.com/RTEMS/rtems/tree/master/cpukit/libcsupport/src
> repository but it also returns "-1". I forgot to say before but I'am 
> using a board that was that
> has two UART channels, Channel A for console e and Channel B for debugging.
> I load the programs and send the command to execute through GDB connect 
> to the port B.
> I get the board responses in the channel A. I can make the board print 
> properly in console (ch A) but when
> I ask to getc(), getchark(),fgets() or scanf() it does not get the 
> character or string.

The problem is that the console driver uses the polled mode. If no char 
is available it calls rtems_task_wake_after(). This function never 
returns since you disabled the clock driver. Try to use this:

#define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER

RTEMS without a clock driver is a very unusual configuration.

-- 
Sebastian Huber, embedded brains GmbH

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