Re: [beagleboard] New BBB and FTDI USB-to-TTL adapters: framing errors

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Gerald Coley

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May 3, 2013, 12:28:02 PM5/3/13
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Well, we use the serial port to test the board in production so I can only assume it is good, otherwise it would have failed. 

Are you setting it to the correct baud rate?

 I have not tested that device, so it is not on approved list. This one is however https://www.sparkfun.com/products/9717

Did you check the list of cables before you bought it?



Gerald



On Fri, May 3, 2013 at 11:21 AM, Florin Iucha <florin...@gmail.com> wrote:
Just got my beagle bone black.  Before powering it on, I connected a Sparkfun FTDI USB-to-TTL adapter [1] to pins 1, 4 and 5 and fired up putty in serial console mode (115,200/8/N/1).  The display was all garbled. Closing putty and trying out Realterm, I get lots of "framing error" messages.

Is there a problem with the serial port on my board? I have revision A5A.  The FTDI adapter works fine on my other embedded boards.

Thanks,
florin

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Florin Iucha

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May 3, 2013, 12:53:56 PM5/3/13
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Hi Gerald,

On Friday, May 3, 2013 11:28:02 AM UTC-5, Gerald wrote:
Well, we use the serial port to test the board in production so I can only assume it is good, otherwise it would have failed. 

Are you setting it to the correct baud rate?

Yes, I'm using 115200, 8 bits, No parity, 1 bit stop, No flow control as documented in http://circuitco.com/support/index.php?title=BeagleBone_Black_Accessories

 I have not tested that device, so it is not on approved list. This one is however https://www.sparkfun.com/products/9717

It is the same FTDI 232 chip, just in a different form factor.  Since only the ground, rx and tx pins are used, it should make no difference.
 
Did you check the list of cables before you bought it?

Yes, but since I have similar parts laying around from other projects, I did not found it productive to spend another $20 on a cable.
 

Interestingly enough, hooking up a logic analyzer captured the "- Boot SPL 2013.04-rc1-14237-g90639fe..." text, so the pin seems to be sending the right message...

It is interesting - I tried two different FTDI adapters (the sparkfun and OSEPP-FTDI) and both behaved in the same way: junk on the screen, framing errors...

florin

Gerald Coley

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May 3, 2013, 12:56:38 PM5/3/13
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Sometime the terminal emulators loose their mind. It happens to me often when plugging in the cable. I suggest you plug in the cable and restart the terminal emulator and see if it clears up..

Gerald


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