NRF9160-SICA-R7 datasheet(171/400 Pages) NORDIC

171 / 400 page

Peripherals

100% duty cycle

New value load

Previously

loaded

duty cycle

0% duty cycle

LOOP.CNT

(LOOP.CNT - 1)

Loop counter

...

last loaded

duty cycle

maintained

Figure 50: Complex sequence (LOOP.CNT>0) starting with SEQ[1]

Note: If a sequence is in use in a simple or complex sequence, it must have a length of SEQ[n].CNT

> 0.

This example shows how the PWM module can be configured to repeat a single sequence until stopped.

NRF_PWM0->PSEL.OUT[0] = (first_pin << PWM_PSEL_OUT_PIN_Pos) |

(PWM_PSEL_OUT_CONNECT_Connected <<

PWM_PSEL_OUT_CONNECT_Pos);

NRF_PWM0->ENABLE

= (PWM_ENABLE_ENABLE_Enabled << PWM_ENABLE_ENABLE_Pos);

NRF_PWM0->MODE

= (PWM_MODE_UPDOWN_Up << PWM_MODE_UPDOWN_Pos);

NRF_PWM0->PRESCALER

= (PWM_PRESCALER_PRESCALER_DIV_1 <<

PWM_PRESCALER_PRESCALER_Pos);

NRF_PWM0->COUNTERTOP = (16000 << PWM_COUNTERTOP_COUNTERTOP_Pos); //1 msec

// Enable the shortcut from LOOPSDONE event to SEQSTART1 task for infinite loop

NRF_PWM0->SHORTS

= (PWM_SHORTS_LOOPSDONE_SEQSTART1_Enabled <<

PWM_SHORTS_LOOPSDONE_SEQSTART1_Pos);

// LOOP_CNT must be greater than 0 for the LOOPSDONE event to trigger and enable looping

NRF_PWM0->LOOP

= (1 << PWM_LOOP_CNT_Pos);

NRF_PWM0->DECODER

= (PWM_DECODER_LOAD_Common << PWM_DECODER_LOAD_Pos) |

(PWM_DECODER_MODE_RefreshCount << PWM_DECODER_MODE_Pos);

// To repeat a single sequence until stopped, it must be configured in SEQ[1]

NRF_PWM0->SEQ[1].PTR = ((uint32_t)(seq0_ram) << PWM_SEQ_PTR_PTR_Pos);

NRF_PWM0->SEQ[1].CNT = ((sizeof(seq0_ram) / sizeof(uint16_t)) <<

PWM_SEQ_CNT_CNT_Pos);

NRF_PWM0->SEQ[1].REFRESH = 0;

NRF_PWM0->SEQ[1].ENDDELAY = 0;

NRF_PWM0->TASKS_SEQSTART[1] = 1;

4418_1315 v2.0

171

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