PIC 18f4680 DIGITAL INPUTS

[MadAl]

Melanie,

I followed your register tutorial and ran into the following snag:

I use HSEROUT on port C6 (the hardware Tx pin) and all works fine.
However when I issue a SEROUT2 command on that pin, the pin remains silent (no activity on that pin using the oscilloscope). The very same SEROUT2 command on port A1 gives activity on the scope screen.
I assume the same applies to the SERIN2 on port C7.
What am I missing here?

[skimask]

I use HSEROUT on port C6 (the hardware Tx pin) and all works fine.
However when I issue a SEROUT2 command on that pin, the pin remains silent (no activity on that pin using the oscilloscope). The very same SEROUT2 command on port A1 gives activity on the scope screen.
I assume the same applies to the SERIN2 on port C7.
What am I missing here?

If the port is still set up to use the hardware serial port, SERIN/SEROUT won't work. The port has to be set up for normal, general purpose I/O to work with SERIN/SEROUT.

[MadAl]

Hi,

I thought about that. I removed the hardware serial defines at the start of the program, and the problem remains.
Or is there another way to disable HW serial?
Btw I tried the same with a 16F877 and also there the same issue exists.

[Bruce]

Try this;

DEFINE HSER_BAUD 9600

Main:
    HSEROUT ["HSER",13,10]
    PAUSE 500
    SEROUT2 PORTC.6,84,["WITH RCSTA.7=1",13,10]
    PAUSE 500
    RCSTA.7=0
    SEROUT2 PORTC.6,84,["WITH RCSTA.7=0",13,10]
    PAUSE 500
    RCSTA.7=1
    
    GOTO Main

You should get this;

HSER
WITH RCSTA.7=0
HSER
WITH RCSTA.7=0

With RCSTA.7 set the USART takes over these pins.

[MadAl]

Excellent, will try that.
I'm convinced it'll work.
thanks