NRF52810-QFAA-R datasheet(260/483 Pages) NORDIC

260 / 483 page

Peripherals

between last period on sequence 0 and the first period on sequence 1. Since SEQ[1].ENDDELAY=0 there

is no delay 1, so SEQ[0] would be started immediately after the end of SEQ[1]. However, as LOOP.CNT is

one, the playback stops after having played only once SEQ[1], and both SEQEND[1] and LOOPSDONE are

generated (their order is not guaranteed in this case).

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

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);

NRF_PWM0->SEQ[0].PTR = ((uint32_t)(seq0_ram) << PWM_SEQ_PTR_PTR_Pos);

NRF_PWM0->SEQ[0].CNT = ((sizeof(seq0_ram) / sizeof(uint16_t)) <<

PWM_SEQ_CNT_CNT_Pos);

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

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

NRF_PWM0->SEQ[1].PTR = ((uint32_t)(seq1_ram) << PWM_SEQ_PTR_PTR_Pos);

NRF_PWM0->SEQ[1].CNT = ((sizeof(seq1_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[0] = 1;

COMPARE

SEQ[0].PTR

SEQ[0].CNT=2, SEQ[1].CNT=3, SEQ[0].REFRESH=1, SEQ[1].REFRESH=0, SEQ[0].ENDDELAY=1, SEQ[1].ENDDELAY=0, LOOP.CNT=1

PWM Clock Period

COMPARE

LOOPSDONE

SEQEND[0]

SEQSTARTED[0]

SEQSTART[0]

Event/Tasks

SEQ[1].PTR

COMPARE

Event/Tasks

1 PWM period

SEQ[0].ENDDELAY=1

PWM Generation maintains

last played value

(continuation)

(continued below)

SEQEND[1]

SEQSTARTED[1]

Figure 52: Example using two sequences

4430_161 v1.0

260

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