DEBUG SERIAL HEADER

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mike808
 
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DEBUG SERIAL HEADER

Post by mike808 »

Can the FTDI Friend (https://www.adafruit.com/products/284) plug directly into the BBB debug headers? Looks like it lines up nicely, but was wondering more about the 5V for power wire. Can BBB handle that or does it need to be 3.3V (ie. need to change the jumper settings on the FTDI friend)

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adafruit_support_mike
 
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Re: DEBUG SERIAL HEADER

Post by adafruit_support_mike »

If you want to power the RasPi from the cable, leave the FTDI Friend at its 5v setting and plug that into the 5v pin on the GPIO header.

If you want to power the RasPi some other way (through the micro-USB port), don't connect the FTDI Friend's VCC line at all. Just leave it floating. All you need in that case is a GND connection so both devices have a common reference voltage.

The signals default to 3.3v, which will work with a RasPi and all but the most finicky of 5v systems.

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mike808
 
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Re: DEBUG SERIAL HEADER

Post by mike808 »

Thanks for the reply. You mentioned RasPi, but is the BBB the same? I wanted to know about the BBB.

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jgotthardt
 
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Re: DEBUG SERIAL HEADER

Post by jgotthardt »

According to the BeagleBone Black Rev C schematic only pins 1, 4, and 5 are connected to the board so the FTDI Friend will work fine as long as the jumpers are set for 3.3 volt logic.

John

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adafruit_support_mike
 
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Re: DEBUG SERIAL HEADER

Post by adafruit_support_mike »

mike808 wrote:Thanks for the reply. You mentioned RasPi, but is the BBB the same? I wanted to know about the BBB.
Ugh.. had my brain on the wrong setting. I use a console cable to power my RasPi on an almost daily basis, so that train of thought has worn the rails pretty smooth.

A BBB would be just the same. The FTDI Friend's signals are already 3.3v, and you can leave the 5v line disconnected.

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nandub
 
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Re: DEBUG SERIAL HEADER

Post by nandub »

I have a BBB A6A, when I plugged the FTDI Friend to the board I only see garbage coming from the serial console. I see the same using screen, picocom, and minicom.

Any help appreciated.

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adafruit_support_mike
 
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Re: DEBUG SERIAL HEADER

Post by adafruit_support_mike »

Sounds like a baudrate mismatch.

I think the BBB defaults to 115200.. what speed are you using?

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nandub
 
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Re: DEBUG SERIAL HEADER

Post by nandub »

I used 115200, 9600 to no avail.

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adafruit_support_mike
 
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Re: DEBUG SERIAL HEADER

Post by adafruit_support_mike »

Hmm.. double check your other connection settings. According to this page:

http://elinux.org/Beagleboard:BeagleBone_Black_Serial

the defaults are 115200, 8 bits, no parity bit, 1 stop bit, no handshake.

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