Help with pwm!

[karimpain]

Hello everyone!
This is my first time here in this forum. I'm a mechatronics engineering student going to build my own quadcopter, so I need 4 pwm or ccp in my microcontroller pic. In fact I am so confused about the kind and number of PIC I'm gonna use!! So can anyone help me with a tutorial on how I program the pwm of a pic using the pwm pin (not the ccp because I know about it).
Thanks for reading this.

[Ttelmah]

Not possible....
We can't talk about the PWM, without the CCP. Guess what the last 'P' in CCP means?.

The CCP _is_ the PWM module. The module has three different modes of operation 'capture' (records a count when an event occurs). 'Compare' (performs some event when a count matches a value), and 'PWM'. Generate a waveform with a programmed period and pulse width.

Now the first key thing is to distinguish PWM pins, from modules. A single CCP module, can only develop one 'timing' (width/period), but may be able to drive several outputs (simple single pulse train, full bridge, and half bridge typically), so may drive up to four pins. For four separate motors with four distinct speeds, you need four actual timing modules. A chip like perhaps the PIC18F25K80 (five modules), is about the smallest.

Then the basic code is the same for all modules. You have to set the timer to generate the frequency you want (will depend on the capacitances on the input pins of the FET's used for the drive, inductance's of the motors, how good your actual drivers are, etc. etc.), and then just setup the CCP to use CCP_PWM, and set the required duty cycle.
So: