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18f4580 PWM config

 
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Lemosek



Joined: 15 Oct 2011
Posts: 36

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18f4580 PWM config
PostPosted: Sun Dec 16, 2012 8:20 am     Reply with quote

Hello,
I need a PWM on pin P1A(RD4). This is output ECCP.
I don't know how I must configure this module.

I tried something like this:
Code:

// TImer2 used for system ticks
// post = 4, period = 250*4*5* 0.2 us = 1 ms

#define T2CON_CONST     T2_DIV_BY_4       
#define PR2_CONST       (250-1)     
#define T2POST_CONST    5

setup_timer_2(T2CON_CONST, PR2_CONST, T2POST_CONST);

SETUP_CCP1(CCP_PWM_H_H);

SET_PWM1_DUTY(100);


But not working.

Best regards
R.L.
Ttelmah



Joined: 11 Mar 2010
Posts: 19535

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PostPosted: Sun Dec 16, 2012 10:13 am     Reply with quote

The ECCP is reverse compatible. To use the default pin, just use:

SETUP_CCP1(CCP_PWM);

Key thing is though, you must have turned off the PSP port:

SETUP_PSP(PSP_DISABLED);

or this will have control of the port pins.

Best Wishes
Lemosek



Joined: 15 Oct 2011
Posts: 36

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PostPosted: Sun Dec 16, 2012 11:37 am     Reply with quote

Hello,
Thank You Ttelmah now it's working but I must also change CCP1 to CCP2.

Best regards
R.L.
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