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SOLVED: FT231X: CTS?

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NivagSwerdna:
I'm using a FT231X for the first time and having a bit of trouble  ;)

From the PC side connecting into the FT231X all is good and I can run FT-PROG etc.  If I connect realterm I can send in characters and get one of the LEDs to flash (I think the labels are the wrong way around but that is not a big deal), however on the other side if I generate characters at the PIC side I do not get an LED flash and neither do characters appear at the terminal.

I did not need hardware handshake so I left pins 19, 6, 18,  4, 5 & 2 disconnected.

I'm starting to wonder if pin 19 or 6 should not have been left floating?

ni.st:
The unused pins may be left floating.

But this reset connection with C20 in series looks a bit strange to me. How is it connected to the uC?

Are you sure the uC is working correctly, have you hooked up a scope or LA?

Dave:
I've dealt with this type of problem before.
Lesson learned: Read the errata.  :palm:

Try configuring one CBUS pin as a #Keep_Awake through FT-PROG and short that pin to ground.

NivagSwerdna:

--- Quote from: ni.st on May 27, 2020, 11:27:18 am ---The unused pins may be left floating.

--- End quote ---
Good news

--- Quote from: ni.st on May 27, 2020, 11:27:18 am ---But this reset connection with C20 in series looks a bit strange to me. How is it connected to the uC?

--- End quote ---
I think that is OK

--- Quote from: ni.st on May 27, 2020, 11:27:18 am ---Are you sure the uC is working correctly, have you hooked up a scope or LA?
--- End quote ---
I did yesterday.  Looks OK.

There are things that I cannot see.. specifically under the QFN.... so I was doubting myself.

NivagSwerdna:

--- Quote from: Dave on May 27, 2020, 12:06:55 pm ---I've dealt with this type of problem before.
Lesson learned: Read the errata.  :palm:

Try configuring one CBUS pin as a #Keep_Awake through FT-PROG and short that pin to ground.

--- End quote ---
That's interesting.  I will explore that.

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