PIC16F1779 settings for EUSART

[tumbleweed]

If you look at Table 12-1 Port Selection and Table 12-2 Available Ports For Output you'll find that the EUSART can't be mapped to PORTD, only PORTB and PORTC.

There are restrictions like this in many of the devices... the PPS matrix isn't a full x-y mux and you usually only get a choice of two ports to pick from.

[Ioannis]

Ooops...

Thanks,
Ioannis

[mpgmike]

If I may make a suggestion; I noticed when you were trying to use PORTD for UART, you initialized your TX Pin low (LATD = 0). I initialize my UART TX Pin high, as that is the idle state. Secondly, your WPUD didn't take advantage of the ability to bias your RX Pin high as well. You may get a false Start of Signal reading when your companion device initializes. Using a Weak Pull-Up on RX reduces that chance.

[Ioannis]

Thank you Mike for the suggestions. Indeed this is the proper way to initialize the ports. At the moment that was the least of the problems.

The important thing is to read carefully the datasheet and as tumbleweed noted, I was setting UART on wrong ports.

Now that I paid more attention and am really awake(!), it works as it should and all is fine.

The people in this forum are one of a kind. Thank you all.

Ioannis