PIC18F452 problem with Port A I/O

[jseidmann]

I am using a board that has a PIC18F452 and I am trying to be able to change the value of RA4. In the code, the value of that pin is toggled every minute, and the value of tris is:

set_tris_a(0b00001111);

In the code, it also says:

setup_adc_ports(RA0_RA1_ANALOG_RA3_REF);
setup_adc(ADC_CLOCK_DIV_32);
set_adc_channel(0);

I am wondering how I can have Pin 4 be an output and actually be able to toggle its value. I have kind of inherited this code and I'm not sure what to do. The TRIS value seems to set RA4 as an output, but I can't get it to output anything, and on startup I have the line "output_high(PIN_A4)".

Does anyone have any ideas of what I can do??

Thanks,

Seidleroni

[PCM programmer]

http://pw2.netcom.com/~fastfwd/answers.html#PIC00085
http://www.piclist.com/techref/microchip/portpins.htm

[jseidmann]

To switch between open collector and tri-state, can I control that functionality like a regular pin using the output_low(PIN_RA4) and output_high(RA4) to switch between the two?

The reason I'm asking is this: I want to use this pin to toggle an LED (it has to be this pin, i've inherited the hardware) The LED is positioned in such a way that it always has 5V on one terminal (with a resistor in series of course) and then going into pin RA4. Is it possible to toggle the LED by switching between tri-state and open drain? If so, can I do this using the I/O commands I stated in the first paragraph?

Thanks! You guys on this forum have been a HUGE help to me. Your help is mucho appreciated.

[PCM programmer]