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Re: Init-problem with ecos.


On Mon, 06 Apr 2009 17:04:56 +0200, Nick Garnett <nickg@ecoscentric.com> wrote:

Robert Brusa <bob.brusa@gmail.com> writes:

Hi
I encountered problems running my app on my at91sam7x512-based board
and  the problem seems to be somewhere in the initialization of
ecos. I then  have written a little app which essentially consists of

#include <cyg/infra/diag.h>// no other includes
void cyg_user_start(void)
{
     diag_printf("\n%s started\n", thisprog);
     myjob(); // consider this a dummy routine for now
     diag_printf("\ncmyjob done\n");
}

When running this app, I get the following output:
ïïInit device '/dev/ser0'
AT91 SERIAL init - dev: fffc0000.6
Set output buffer - buf: 0x00202c80 len: 128
Set input buffer - buf: 0x00202d00 len: 128
Init device '/dev/ser1'
AT91 SERIAL init - dev: fffc4000.7
Set output buffer - buf: 0x00202d80 len: 128
Set input buffer - buf: 0x00202e00 len:
128×ÔïïïïïïïïïÉïïÍïïÉï5)55)5)ïïïïïïïïÉï'AT91 SERIAL init - dev:
fffc0000.6
Set output buffer - buf: 0x00202c80 len: 128
Set input buffer - buf: 0x00202d00 len: 128
Init device '/dev/ser1'
AT91 SERIAL init - dev: fffc4000.7<cut>.... and it repeats this

When setting a breakpoint at the call myjob() it is reached, but now
output appears on ser1. But debugging this application is tricky,
because  it does not show reproducible behaviour. What's going on here?

AT91 serial devices cannot be shared between diagnostics and the serial device driver. Both use DMA and once the device driver starts it points the DMA engine at its own buffers. The diagnostic code doesn't know this and gets thoroughly confused.

You must disable the serial driver completely on the device you want
to use for diagnostics in the configuration.


Thank you Nick. This helped indeed. I was not aware of this.
  Robert


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