PWM Waveform

[GENADI MANOILENKO]

Hello there.

I am wondering if PWM peripheral in waveform is able to generate a following sequence:

The idea, as you may see, is to generate a sequence with the same Duty Cycle (50%) and different Periods.

Best Regards, Genadi.

[Kaja]

Hi,


you can have a look at our example, 

note to do different periods you need to restart PWM... 

But you can have a look at the wave counter, this might help you. 

Best regards,
Kaja

[hmolesworth]

This might help:

#define CYCLE_A  (2*1000)   // Some arbitrary number of clock cycles to match required resolution
#define CYCLE_B  (2*2000)	// More clock cycles gets wider
#define CYCLE_C  (2*3000)
#define CYCLE_D  (2*4000)

nrf_pwm_values_wave_form_t pecularSequence[] = {
  //   Index     Normal pin          Inverted     (Spare)  Top Value
  //   =====     =================== ==========   =======  =========
  { /*   0  */   0x8000|(CYCLE_A/2), (CYCLE_A/2), 0,       CYCLE_A  },
  { /*   1  */   0x8000|(CYCLE_B/2), (CYCLE_B/2), 0,       CYCLE_B  },
  { /*   2  */   0x8000|(CYCLE_C/2), (CYCLE_C/2), 0,       CYCLE_C  },
  { /*   3  */   0x8000|(CYCLE_D/2), (CYCLE_D/2), 0,       CYCLE_D  },
};
#define NUM_PWM_ITERATIONS  ( sizeof(pecularSequence)/sizeof(pecularSequence[0].channel_0) )
#define NUM_PWM_TABLE_LINES ( sizeof(pecularSequence)/sizeof(pecularSequence[0]) )
STATIC_ASSERT(sizeof(nrf_pwm_values_wave_form_t) == sizeof(pecularSequence[0]), "pecularSequence line size");

//  NUM_PWM_ITERATIONS WaveLength (.CNT) is 15-bit Amount of values (duty cycles) in this sequence