[ECOS] AT91 EB40(A) board serial port issues?

[Scott Dattalo]

On Mon, 17 Jun 2002, Tim Drury wrote:

> 
> Okay, I inserted 'das blinkenlights' throughout the ecos hal and redboot
> and it all looks good.  The code enter's redboot's while(true) loop where
> the prompt ("redboot>") is printed to the serial port.  I forced it to print
> to the serial port on each loop iteration so I could try to see something
> in minicom.  I run it from gdb, ctrl-z out of gdb and the serial-out led is
> still steadily blinking assuring me that redboot is still pumping out prompts.
>   
> I run 'minicom -o' but all I see is garbage.  I used 8N1 with no flow control
> and tried every baud rate from 9600 to 115200.  Could the clock freq of this
> the AT91R80004 (used in the EB40A) be such that the usart freq is 'just off' 
> from what the pc can read?  I find this very unlikely.  Can anyone offer
> other suggestions to try and fix this?

Did you measure the bit timing on the RS232 lines with an oscilloscope?

Scott


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