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Help on generating PWM on RB0/PWM0 pin !!

 
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daviz poh
Guest
Help on generating PWM on RB0/PWM0 pin !!
PostPosted: Wed Dec 29, 2004 4:05 am     Reply with quote
Hi,

After searching for examples in setting PWM duty cycle in CCS forum, I decide to write this to seek for help.

Currently, I am using PIC18F2331 with 16Mhz crystal.
Can someone advise me on how to write the code for output a PWM on RB0/PWM0 pin with 50% dutycycle with any frequency??

Really appreciate that someone will help me.


Thanks very much. Question
Guest
Guest
2331/2431 EPWM example
PostPosted: Wed Dec 29, 2004 5:50 am     Reply with quote
This setup is a snip from working code. Don't forget to set up the TRIS register for the PWM output you're using.

This is a rough setup - you could refine it alot!

Code:

// Registers for the EPWM

#byte DFLTCON = 0xf60
#byte CAP3CON = 0xf61
#byte CAP2CON = 0xf62
#byte CAP1CON = 0xf63
#byte CAP3BUFL = 0xf64
#byte CAP3BUFH = 0xf65
#byte CAP2BUFL = 0xf66
#byte CAP2BUFH = 0xf67
#byte CAP1BUFL = 0xf68
#byte CAP1BUFH = 0xf69
#byte OVDCONS = 0xf6a
#byte OVDCOND = 0xf6b
#byte FLTCONFIG = 0xf6c
#byte DTCON = 0xf6d
#byte PWMCON1 = 0xf6e
#byte PWMCON0 = 0xf6f
#byte SEVTCMPH = 0xf70
#byte SEVTCMPL = 0xf71
#byte PDC3H = 0xf72
#byte PDC3L = 0xf73
#byte PDC2H = 0xf74
#byte PDC2L = 0xf75
#byte PDC1H = 0xf76
#byte PDC1L = 0xf77
#byte PDC0H = 0xf78
#byte PDC0L = 0xf79
#byte PTPERH = 0xf7a
#byte PTPERL = 0xf7b
#byte PTMRH = 0xf7c
#byte PTMRL = 0xf7d
#byte PTCON1 = 0xf7e
#byte PTCON0 = 0xf7f

// Don't forget to set up TRISB!!!!!



// Set up the PWM module....

   PDC0L = 0;
   PDC0H = 0;
   PDC1L = 0;
   PDC1H = 0;
   PDC2L = 0;
   PDC2H = 0;
   
   // LOOK AT THE DATA SHEET!!!!!!!!!!!!!!!!!!! //
   
   // Set Time Base (use defaults)
   PTCON0 = 0;
   
   // Enable PWM Time Base
   
   PTCON1 = 0x80;
   
   // Set for 9.8 KHz @ 40 MHz clock
   // You can set this where you like for your clock

   PTPERL = 0xff;
   PTPERH = 0x03;
   
   // Enable three PWM generators in independent mode
   
   PWMCON0 = 0x77;
   
   // Don't need any of these features....
   
   PWMCON1 = 0x00;
   
   
   // For PWM 0
   // You have two others independently available with this setup
   
   PDC0L = 0;
   PDC0H = 0x80; // 12 bit value, set to 0x0800 or 50%

   while(1);
   
   ....


Good luck! Smile
Guest
Guest
PostPosted: Wed Dec 29, 2004 5:53 am     Reply with quote
Small typo at the end of that code...

Should be

PDC0H = 0x08;

Not enough coffee yet! Rolling Eyes
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Wed Dec 29, 2004 5:56 pm     Reply with quote
Guest wrote:
Small typo at the end of that code...

Should be

PDC0H = 0x08;

Not enough coffee yet! Rolling Eyes


Idea If you register then you can edit your post
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