AdamNet weirdness - Adam not responding after status request, WTF?

[tschak909]

#FujiNet #ESP32 #ColecoAdam Ok, this is genuinely weird:

 

The ESP32 is able to RX just fine on the AdamNet, we can see the bits fine on the logic analyzer, and the ESP32 is interpreting the status packet (14), and sending back the response (84), but the Adam is not responding with either an ack (24) or nak (C4) (it should happen about 160-200us later), as if it can't even hear it. It simply continues on with the next status request (15).

 

We've checked at both AdamNet ports, and can see our response packet in both places.

 

But honestly, I am at a loss as to why this is even happening.

 

We are connecting to the ESP32 through a mosfet NPN transistor, with requisite resistors (see schematic), but the output is truly puzzling.

 

 

 

Any ideas?

 

Test program https://github.com/FujiNetWIFI/Adam-Arduino-Tests/blob/main/12-boot-attempt-4/src/main.cpp

[tschak909]

Traced to the fact that the mosfet isn't sufficiently level shifting to 5v. We've fixed the problem.

 

-Thom