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dmendesf
Joined: 31 Dec 2005
Posts: 32
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| Problem with PWM and PIC16F1619 |
 Posted: Thu Jan 05, 2017 8:26 am |
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Hi, i´m trying to setup PWM with this PIC. It uses PIN MUX and I think I made some mistake. My CCS version is 5.066
I´m running from internal oscillator at 16MHz:
| Code: | | #use delay(internal=16000000,restart_wdt) |
Selected PIN_C0 as PWM output:
| Code: | | #pin_select CCP1OUT = PIN_C0 |
I´ve chosen CCP1:
| Code: |
setup_timer_2(T2_DIV_BY_4,63,1); //51,2 us overflow, 51,2 us interrupt
setup_ccp1(CCP_PWM|CCP_TIMER2);
set_pwm1_duty(131); |
And... pin stays at 1 :(
Any ideas? |
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temtronic
Joined: 01 Jul 2010
Posts: 9243
Location: Greensville,Ontario
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| Posted: Thu Jan 05, 2017 8:39 am |
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lots... but please post your COMPLETE program, it's necessary as our crystal balls all got busted on New Years Eve.
Rule #1 on this forum is to post a small, compilable,cutandpasteable program showing your problem. That way we can quickly cut/paste/compile/test on our systems and get back to you fast!
Jay |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19539
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| Posted: Thu Jan 05, 2017 9:04 am |
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However:
set_pwm1_duty(131L);
Note the 'L'. Otherwise you are running the PWM in 8bit mode, and the output will be permanently on with this value.... |
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dmendesf
Joined: 31 Dec 2005
Posts: 32
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| Posted: Thu Jan 05, 2017 9:15 am |
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Hi Jay.... here´s a sample program... main.c:
| Code: | #include <main.h>
void main()
{
setup_timer_2(T2_DIV_BY_4,63,1); //51,2 us overflow, 51,2 us interrupt
setup_ccp1(CCP_PWM|CCP_TIMER2);
set_pwm1_duty(131L);
while(TRUE)
{
}
} |
and main.h:
| Code: | #include <16F1619.h>
#fuses NOBROWNOUT,NOCLKOUT,NOIESO,NODEBUG,NOLVP,NOWDT,INTRC_IO
#use delay(internal=16000000,restart_wdt)
#pin_select CCP1OUT = PIN_C0 |
I already fixed the "L" issue but the problem persists. Thanks for your help. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19539
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| Posted: Thu Jan 05, 2017 10:29 am |
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Though not the problem, your period is not what you think.
16Mhz/4 = peripheral clock
4MHz/4 = Timer2 clock
1Mhz/64 = PWM frequency = 15625Hz
64uSec period.
Hopefully you don't intend to try to use the interrupt at this sort of frequency. If so, around 1/4 of your processor's time will be used just getting into and out of the interrupt. You'll be interrupting every 256 instructions... |
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dmendesf
Joined: 31 Dec 2005
Posts: 32
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| Posted: Thu Jan 05, 2017 10:32 am |
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Seems I found it. setup_ccp1 appears not to be working on this chip. I changed
| Code: | | setup_ccp1(CCP_PWM|CCP_TIMER2); |
to:
| Code: | #pin_select CCP1OUT = PIN_C6
#byte CCP1CON = 0x293
#byte CCPTMRS = 0x29e
SET_TRIS_C( 0x00 );
CCP1CON = 0x8c;
CCPTMRS = 0x00; |
And now I have a working PWM at pin_c6 (i´ll change now to pin_c0 and see if it keeps working). How can I report back this to CCS? I´ve chosen this processor because it´s used in the curiosity board so in my mind it would be well debugged... :(
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dmendesf
Joined: 31 Dec 2005
Posts: 32
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| Posted: Thu Jan 05, 2017 10:49 am |
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| Hi Ttelmah, thanks for this reminder. I plan to use the PID Math Accelerator to control the PWM duty (I´ll probably do the debug of this entire chip to CCS :D ) I also tried my code with PIN_C0 and it worked... so PIN MUX is working. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Jan 05, 2017 12:01 pm |
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| Quote: | | How can I report back this to CCS ? |
At the top of this forum, it says:
| Quote: | CCS does not monitor this forum on a regular basis.
Please do not post bug Reports on this forum. Send them to [email protected] |
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dmendesf
Joined: 31 Dec 2005
Posts: 32
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| Posted: Thu Jan 05, 2017 12:07 pm |
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Done.... let´s see how fast they fix it.
| PCM programmer wrote: | | Quote: | | How can I report back this to CCS ? |
At the top of this forum, it says:
| Quote: | CCS does not monitor this forum on a regular basis.
Please do not post bug Reports on this forum. Send them to [email protected] |
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