Don,
The diagrams you presented were very clear on everything. Unfortunately, the vfd still does not respond after wiring it up exactly as illustrated.
I'm using only the programs with 8 bit mode programs, in particular the two entitled 'YES' and 'DON', 12.5.3 and 12.5.4 resp.
I know you mentioned your non-use of voltage measurements, but when nothing came on, I checked the voltages on the pins on the connector at the back of the display. Noticed active high voltages when I had r/s and en from the display going to digpins 8 and 10, according to your earlier post for PortB pin positions, and the code for #definitions for the 'YES' sketch. Now, all pins, (except vcc ofcourse) including r/s are active low with the new wiring scheme.
The super reinstalled the original CIODIO-48 back into the computer he used to run his program; even his program did not get it to work, although on disconnecting the vfd and checking the scope for the appropriate high/low signals for the write part of the instruction set, his program appears to be at fault, which does not yet rule out the unit; he’s working on that.
Have analyzed this last post you sent and changed the clock speed 16MHz for the desired delays.
I’m trying to come up with a function to address the timing issue as far as sending data and commands, to work that into the code.
Will let you know what I come up with. Apologize for not responding sooner.
Dave.