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Re: AT91 EB40(A) board serial port issues?
- From: Scott Dattalo <scott at dattalo dot com>
- Cc: ecos-discuss at sources dot redhat dot com
- Date: Mon, 17 Jun 2002 08:16:59 -0700 (PDT)
- Subject: Re: [ECOS] AT91 EB40(A) board serial port issues?
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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