USB connection Failing for olimex SAM7EX256 board

Hi All,

I recently bought Olimex SAM7EX256 board. When I connect it to the USB
port, it is not getting recognized by the WinXP. If I start SAM-BA
v2.6 and try to connect to \usb\ARM0, it says 'Failed to open Connection'.

I tried Erasing Flash by ERASE pin as per this tutorial
http://www.sparkfun.com/datasheets/DevTools/SAM7/Your%20Atmel%20Board%20May%20Not%20Be%20Dead.pdf
and also TST pin setting. What could be wrong? I tried to use serial
port connection through USB to serial adapter with board powered by
USB. This also is giving the same message 'Failed to open Connection'.

Any clues will be appreciated. Thanks in advance.

Kishor

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It doesn't work when powered from USB, you need to use an external power supply.

1. Switch the board's power supply jumper from "USB" to "EXT".
2. Apply power to the board
3. Connect the "erase" jumper and leave it connected for a second or two.
4. Disconnect the "erase" jumper
5. Insert the USB cable
6. Press RESET.

This sequence always does it for me.

On Mon, Jun 2, 2008 at 7:58 PM, skillgames2004 wrote:
> Hi All,
>
> I recently bought Olimex SAM7EX256 board. When I connect it to the USB
> port, it is not getting recognized by the WinXP. If I start SAM-BA
> v2.6 and try to connect to \usb\ARM0, it says 'Failed to open Connection'.
>
> I tried Erasing Flash by ERASE pin as per this tutorial
> http://www.sparkfun.com/datasheets/DevTools/SAM7/Your%20Atmel%20Board%20May%20Not%20Be%20Dead.pdf
> and also TST pin setting. What could be wrong? I tried to use serial
> port connection through USB to serial adapter with board powered by
> USB. This also is giving the same message 'Failed to open Connection'.
>
> Any clues will be appreciated. Thanks in advance.
>
> Kishor

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Hi,

Thanks for replying.I tried changing to external power supply, but
there is no change. SAM-BA still gives the same message 'Failed to
open connection'.
Is there anyway to debug using serial port or otherwise?

--- In A..., "Bogdan Marinescu"
wrote:
>
> It doesn't work when powered from USB, you need to use an external
power supply.
>
> 1. Switch the board's power supply jumper from "USB" to "EXT".
> 2. Apply power to the board
> 3. Connect the "erase" jumper and leave it connected for a second or
two.
> 4. Disconnect the "erase" jumper
> 5. Insert the USB cable
> 6. Press RESET.
>
> This sequence always does it for me.
>

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I got it working. I think the problem was with JTAGSel jumper. Once I removed that jumper, Windows recognised the board as Atmel and I am able to connect to it through USB from SAM-BA.

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