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PWM Timer Calculations Spreadsheet

 
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jgschmidt



Joined: 03 Dec 2008
Posts: 167
Location: San Antonio, TX

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PWM Timer Calculations Spreadsheet
PostPosted: Sat Jun 12, 2010 3:34 pm     Reply with quote

While working on a PWM application I struggled with datasheets, application notes and forum topics to arrive at the correct parameters for the CCS statements that control the PWM hardware. I also wanted to capture what I learned since I would probably forget it by the time I needed it again, so I developed a spreadsheet that produces the actual statements you need to include in your program. This was featured in the June 2010 issue of Servo Magazine. The article and spreadsheet are on my website at www.jgscraft.com/ledpwm.

Here is an example of the code the spreadsheet produces for a PWM frequency of 16KHz on a midrange PIC running at 8MHz.
Code:
setup_timer_2(T2_DIV_1, 124, 1 );
setup_ccp1( CCP_PWM );
set_pwm1_duty( 250L ); // square wave output - 50% duty

The spreadsheet assumes 4 clocks per instruction cycle.

Enjoy.
TYSCSTOM



Joined: 03 Jun 2010
Posts: 8
Location: Houston

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PostPosted: Sat Jul 03, 2010 10:13 am     Reply with quote

Great work!
I plan on using this for several projects in the future.
Having run through several scenario, it looks accurate to me.
jgschmidt



Joined: 03 Dec 2008
Posts: 167
Location: San Antonio, TX

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PostPosted: Sat Jul 03, 2010 5:14 pm     Reply with quote

Thanks for the feedback.
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