DEBUG SERIAL HEADER
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- mike808
- Posts: 74
- Joined: Sat May 25, 2013 10:22 pm
DEBUG SERIAL HEADER
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)
- adafruit_support_mike
- Posts: 67446
- Joined: Thu Feb 11, 2010 2:51 pm
Re: DEBUG SERIAL HEADER
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.
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.
- mike808
- Posts: 74
- Joined: Sat May 25, 2013 10:22 pm
Re: DEBUG SERIAL HEADER
Thanks for the reply. You mentioned RasPi, but is the BBB the same? I wanted to know about the BBB.
- jgotthardt
- Posts: 33
- Joined: Mon Dec 03, 2007 11:58 am
Re: DEBUG SERIAL HEADER
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
John
- adafruit_support_mike
- Posts: 67446
- Joined: Thu Feb 11, 2010 2:51 pm
Re: DEBUG SERIAL HEADER
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.mike808 wrote:Thanks for the reply. You mentioned RasPi, but is the BBB the same? I wanted to know about the BBB.
A BBB would be just the same. The FTDI Friend's signals are already 3.3v, and you can leave the 5v line disconnected.
- nandub
- Posts: 2
- Joined: Thu Jun 20, 2013 12:10 am
Re: DEBUG SERIAL HEADER
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.
Any help appreciated.
- adafruit_support_mike
- Posts: 67446
- Joined: Thu Feb 11, 2010 2:51 pm
Re: DEBUG SERIAL HEADER
Sounds like a baudrate mismatch.
I think the BBB defaults to 115200.. what speed are you using?
I think the BBB defaults to 115200.. what speed are you using?
- nandub
- Posts: 2
- Joined: Thu Jun 20, 2013 12:10 am
Re: DEBUG SERIAL HEADER
I used 115200, 9600 to no avail.
- adafruit_support_mike
- Posts: 67446
- Joined: Thu Feb 11, 2010 2:51 pm
Re: DEBUG SERIAL HEADER
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.
http://elinux.org/Beagleboard:BeagleBone_Black_Serial
the defaults are 115200, 8 bits, no parity bit, 1 stop bit, no handshake.
Please be positive and constructive with your questions and comments.