#nrf52840: create 2 PWMs with different pulse width using single instance by direct register access

[vikrant8051]

As per #nrf52840 datasheet

  NRF_P0->DIR |= 0x0001E000;
  NRF_P0->OUT |= 0x0001E000;


  uint16_t pwm_seq[4]= {160 , 3200};

  NRF_PWM0->PSEL.OUT[0] = 0;
  NRF_PWM0->PSEL.OUT[0] = 13 ;

  NRF_PWM0->PSEL.OUT[1] = 0 ;
  NRF_PWM0->PSEL.OUT[1] = 14 ;

  NRF_PWM0->ENABLE = 0x00000001;
 
  NRF_PWM0->MODE = 0x00000000;

  NRF_PWM0->PRESCALER = 0x00000000; //16Mhz

  NRF_PWM0->COUNTERTOP = 16000; // PWM_Freq = 1000 Hz

  //NRF_PWM0->LOOP = 0x00000000;

  //NRF_PWM0->DECODER = 0x00000002;
 
  NRF_PWM0->SEQ[0].PTR = (uint32_t)(pwm_seq);
 
  NRF_PWM0->SEQ[0].CNT = 2;
 
  NRF_PWM0->SEQ[0].REFRESH = 0;
 
  NRF_PWM0->SEQ[0].ENDDELAY = 0;
 
  NRF_PWM0->TASKS_SEQSTART[0] = 1;

I've configured PWM0 registers as mentioned above. But with this setting both LED1 & LED2 are showing same intensity that means both channels set to common pulse width.

How to edit this configuration so that both channels will set to different pulse width ?

If I set NRF_PWM0->DECODER = 0x00000002; I didn't observe anything on two channels.

How to update pulse width dynamically after these initial configuration ?

Thank You !!