40 kHz wave

[mister_e]

Nop! HPWM will not do the job in this case... look in the PBP manual for the specific limitation on different crystal speed.

in your case you must write directly to the internal register related by the PWM module. look section 11 of the datasheet and look to the Milestag's example. I'm not a fan of HPWM myself too.

555's are not as this bad.. it's working great but it's still a RC oscillator ... like the PIC internal one. So both will shift a litlle bit with the temperature variation.

There's still some easy circuit to build with some CMOS inverter OR Route the CLKOUT of the PIC to a frequency divider OR.... OR...

[RUBiksCUbe]

How do you write stuff to the internal registers? I've tried to set up my PIC as a counter before but I didn't know how to, and the COUNT command didn't really work too well. I'm looking through my PICs datasheet (12F683) and I don't understand what it's talking about. What is the CCP1CON register? It mentions it a lot in the PWM section.

It says that in order to set the PWM period I need to the PR2 register. How/What do I write?

[milestag]

Read my earlier post again. I already showed you exactly how to write to those registers, and the values you need for 40KHz.

Just make sure that those are the identical register names.

[RUBiksCUbe]

I tried your code (the register names are the same) but it didn't work. The datasheet tells me to "Make the CCP1 pin an output by clearing the
TRISIO<2> bit." and your code didn't do that. How do I clear a bit?

[mister_e]

clear bit n => bit n=0
set bit n => bit n=1

clear bit 2 of TRISIO => TRISIO.2=1

the Register value will be different for each crystal speed. You can run the F683 with the internal 8 MHZ or lower, 4MHZ is rthe default speed. Refer to the OSCCON table

[RUBiksCUbe]

I think it really helps when making writing code for a PIC when the PIC actually works. >:0. I was using a dead PIC. When I saw that A.0 was putting out a constant .5 volts and A.1 was putting out around 4 I realized that it might be the PICs fault. I tried a simple blinking program and the PIC is indeed dead. I'm switching over to the more powerfull (and faster) 18F252 running at 20 MHz.

[milestag]

I think it really helps when making writing code for a PIC when the PIC actually works. >:0. I was using a dead PIC. When I saw that A.0 was putting out a constant .5 volts and A.1 was putting out around 4 I realized that it might be the PICs fault. I tried a simple blinking program and the PIC is indeed dead. I'm switching over to the more powerfull (and faster) 18F252 running at 20 MHz.

I am using the 18F2525 at 8MHz, so you will have to change some of those Timer2 values. The formula for calculating the values is in the PIC datasheet. Otherwise it should work. Don't let those formulas scare you off, it's really pretty simple.

good luck

Jim