Hi,
If you're reading this - thank you!
I'm having problems getting any communication between PC and 28X/40X protoboard AXE022P (which I bought from techsupplies pre-assembled).
I'm using a new 40X1 part inserted the right way round. The only thing added to the protoboard are a few turned pin headers on the in/out ports.
It must be something simple - I hope
Tests done already as follows:
Software latest version - ok. Ver 5.2.0
Reset pressed and released 1sec after download - ok. Still no comms.
5V - ok. less than 10mV pk-pk ripple from Melcher switchmode PSU.
Power jumper position on protoboard - ok. set for external psu.
0,+V on board - ok. 0V/5V at correct positions on protoboard.
PC comport connections - ok. level changes visible on download cable on scope.
Xtal oscillation - ok. Visible on scope.
It may be that the next step (when time permits) is to put the 40X1 on a breadboard with minimal circuit and see if it communicates.
Any comments/suggestions would be much appreciated.
Regards
Michael
If you're reading this - thank you!
I'm having problems getting any communication between PC and 28X/40X protoboard AXE022P (which I bought from techsupplies pre-assembled).
I'm using a new 40X1 part inserted the right way round. The only thing added to the protoboard are a few turned pin headers on the in/out ports.
It must be something simple - I hope
Tests done already as follows:
Software latest version - ok. Ver 5.2.0
Reset pressed and released 1sec after download - ok. Still no comms.
5V - ok. less than 10mV pk-pk ripple from Melcher switchmode PSU.
Power jumper position on protoboard - ok. set for external psu.
0,+V on board - ok. 0V/5V at correct positions on protoboard.
PC comport connections - ok. level changes visible on download cable on scope.
Xtal oscillation - ok. Visible on scope.
It may be that the next step (when time permits) is to put the 40X1 on a breadboard with minimal circuit and see if it communicates.
Any comments/suggestions would be much appreciated.
Regards
Michael