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PWM (for sine wave )

 
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pandi



Joined: 17 Sep 2007
Posts: 9
Location: Chennai-India

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PWM (for sine wave )
PostPosted: Thu Sep 20, 2007 1:28 am     Reply with quote
hi...

I sent some sine wave index(99 values for one half cycle). I need for sent index value equal to 10ms

this my program

for (index =0; index<99; index++)
{
set_pwm1_duty( pwmtab[index] );
set_pwm2_duty( pwmtab[index] );

if ( index == 98 )
{
index = 0;
}
}


I need for sent all index values equal to 10msec time.

pls help me sir
libor



Joined: 14 Dec 2004
Posts: 288
Location: Hungary

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PostPosted: Thu Sep 20, 2007 1:39 am     Reply with quote
If you include a delay_ms(10); instruction in your loop then each value will be active for 10 ms.
Guest
Re: PWM (for sine wave )
PostPosted: Thu Sep 20, 2007 1:23 pm     Reply with quote
pandi wrote:
hi...

i sent some sine wave index(99 values for one half cycle) . i need for sent index value equal to 10ms

this my program

for (index =0; index<99; index++)
{
set_pwm1_duty( pwmtab[index] );
set_pwm2_duty( pwmtab[index] );

if ( index == 98 )
{
index = 0;
}
}


i need for sent all index values equal to 10msec time

pl help me sir

Set up a timer to interrupt every 10mS ... Then in the Timer ISR just set a flag. Don;t make the mistake of trying to do too much stuff in the ISR.
monitor the flag and when it's set output the next value, then clear the flag and wait for the next.
I posted a rough outlie of the code in a previous posting...
ELCouz



Joined: 18 Jul 2007
Posts: 427
Location: Montreal,Quebec

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PostPosted: Fri Sep 21, 2007 2:50 am     Reply with quote
double post... http://ccsinfo.com/forum/viewtopic.php?t=32134
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