Bit Banging input to output on PIC16F876A

[Bruce]

Melanie,

I would love to see an example of how this works. It would be really nice for sending IR serial
data modulated at 38-40kHz.

[Melanie]

Give me a couple of days Bruce to find some spare time and throw an example together - I'll post it here... watch this space...

[mister_e]

7 days a week, 24 hours a day, you only work 120 hours a week... so you still have spare time huh?

I see what's you're cooking. I've used something like that in the past... before i lost everything on my hard drive

I remember that i also modified SEROUT routine... and it also remember me something that Darrel already did here... i'll search for it now.

[Bruce]

I've tried what Melanie mentioned, but could never get it to work properly when changing
Vref with another I/O-pin.

[mister_e]

Probably where...

... and almost no software overhead...

came from.

2 diodes, 1 resistor build a cheap AND gate... without code overhead.

<hr>
EDIT: smells like the comparator input change, then within the ISR you perform the AND function.

[Dave]

Bronurstomp, Why even involve hardware as the ccp module inside the pic can do the work for you. Just set the period and pwm of the ccp module at 38khz. and set the ccpl value to 50 % or 0%. I have been doing this for the last 5 years in the development of the tire pressure lf transmissions at 125 khz...

Dave Purola,
N8NTA

[Bronurstomp]

I guess I wasn't very clear about what I want to know. I'm holding back some info because this circuit may be very valuable.
Presently, I have the 2 HPWM outputs going to a quad 2-input AND gate with the other 4 digital outputs used for "steering" the 2 PWMs to 2 places each. They are the forward and reverse speed control of two motor control H-Bridges. PWM ANDED.JPG
This circuit works fine. I want to eliminate the 4 AND gates, thus the chip and caps from my PCB. See Un ANDED PIC.JPG
The question is about the PICBASIC PRO syntax.
PORTB.6 = PORTA.2 AND PORTB.2
Will this syntax work assuming the PIC is producing 2 varying duty cycle PWMs at 3KHZ, hard wire connected to general purpose digital inputs?
PORTA.2 tied to HPWM1, and PORTA.3 tied to HPWM2 (Pin 12-4 and Pin 13-5)
I get no errors when compiling, but I have no way to test the hardware.

Thanks!