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adcor
Joined: 21 Feb 2008
Posts: 31
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| PWM for PIC24FJ128GC006 and CCS 5.077 |
 Posted: Mon Jun 18, 2018 1:18 am |
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I cannot get the PWM working using the code below, maybe someone will spot the issue:
| Code: |
#include <24FJ128GC006.h>
#DEVICE CONST=READ_ONLY
#device ADC=12
#FUSES FRC_PLL, PLL2, NOPROTECT, NOWDT, NOWRT, NODEBUG
#USE delay(internal=8MHz, clock=32Mhz)
#pin_select OC1 = PIN_B4 // PWM out 4khz
void main()
{
setup_compare( 1, COMPARE_PWM_EDGE | COMPARE_TRIG_SYNC_TIMER3 | COMPARE_TIMER3 );
setup_timer3(TMR_INTERNAL | TMR_DIV_BY_8, 500);//250uS
set_pwm_duty(1,251);
while (TRUE);
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thanks |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19215
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| Posted: Mon Jun 18, 2018 3:51 am |
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One reason, and a comment:
Reason: COMPARE_CONT_PULSE needed.
Comment:
You do realise on these you don't have to use a timer?.
These have an internal timer on each channel that can be used instead. Use 'COMPARE_SYSTEM_CLOCK', and setting the RS register (set_compare_time). No prescaler though. However does mean you can save lots of timers!...  |
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adcor
Joined: 21 Feb 2008
Posts: 31
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| Posted: Mon Jun 18, 2018 5:24 am |
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thanks for your answer. I tried both suggestion but no luck yet. (even COMPARE_TOGGLE)
| Code: |
setup_compare(1,COMPARE_CONT_PULSE | COMPARE_TRIG_SYNC_TIMER3 | COMPARE_TIMER3 );
setup_timer3(TMR_INTERNAL | TMR_DIV_BY_8, 500);//250uS
set_pwm_duty(1,251);
//Second option
setup_compare(1,COMPARE_CONT_PULSE | COMPARE_SYSTEM_CLOCK );
set_compare_time(1, 1819);
set_pwm_duty(1,900); // set 50% duty |
You also helped me a few days ago with a CN24 compiler error for this processor....I am having doubts about this PIC/compiler combo.
thanks |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19215
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| Posted: Mon Jun 18, 2018 7:56 am |
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Are you sure your CPU is clocking?.
Having 'CLOCK', set to a different frequency than 'INTERNAL' is very odd. Using:
| Code: |
#include <24FJ128GC006.h>
#DEVICE CONST=READ_ONLY
#device ADC=12
#FUSES FRC_PLL, PLL2, NOPROTECT, NOWDT, NOWRT, NODEBUG
#USE delay(internal=32MHZ)
#pin_select OC1 = PIN_B4 // PWM out 4khz
void main()
{
setup_compare( 1, COMPARE_FAULT_CLEAR);
setup_compare( 1, COMPARE_PWM_EDGE | COMPARE_TRIG_SYNC_TIMER3 | COMPARE_CONT_PULSE | COMPARE_TIMER3 );
setup_timer3(TMR_INTERNAL | TMR_DIV_BY_8,499);//250uS
set_pwm_duty(1,249);
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It is merrily outputting a pulse for me |
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adcor
Joined: 21 Feb 2008
Posts: 31
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| SOLVED! PWM for PIC24FJ128GC006 and CCS 5.077 |
| Posted: Mon Jun 18, 2018 4:08 pm |
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| Thank you, it worked! |
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