Would you please tell me how to use the nrf52832 PWM interface to implement differential output to spkr?
Here is my PWM interface configuration code:
NRF_PWM0->PSEL.OUT[0] = (PWM_IO << PWM_PSEL_OUT_PIN_Pos) | (PWM_PSEL_OUT_CONNECT_Connected << PWM_PSEL_OUT_CONNECT_Pos);
NRF_PWM0->PSEL.OUT[1] = (0 << PWM_PSEL_OUT_PIN_Pos) | (PWM_PSEL_OUT_CONNECT_Disconnected << PWM_PSEL_OUT_CONNECT_Pos);
NRF_PWM0->PSEL.OUT[2] = (1 << PWM_PSEL_OUT_PIN_Pos) | (PWM_PSEL_OUT_CONNECT_Disconnected << PWM_PSEL_OUT_CONNECT_Pos);
NRF_PWM0->PSEL.OUT[3] = (2 << PWM_PSEL_OUT_PIN_Pos) | (PWM_PSEL_OUT_CONNECT_Disconnected << 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 = (256/*16000*/ << PWM_COUNTERTOP_COUNTERTOP_Pos);
NRF_PWM0->DECODER = (PWM_DECODER_LOAD_Common << PWM_DECODER_LOAD_Pos) | (PWM_DECODER_MODE_RefreshCount << PWM_DECODER_MODE_Pos);
NRF_PWM0->SHORTS = (PWM_SHORTS_LOOPSDONE_SEQSTART0_Disabled << PWM_SHORTS_LOOPSDONE_SEQSTART0_Pos);
Here is my PWM audio output code:
NRF_PWM0->SEQ[0].PTR = ((uint32_t)(pwmdata) << PWM_SEQ_PTR_PTR_Pos);
NRF_PWM0->SEQ[0].CNT = ((sizeof(pwmdata) / sizeof(uint16_t)) << PWM_SEQ_CNT_CNT_Pos);
NRF_PWM0->SEQ[0].REFRESH = REFRESHBD;
NRF_PWM0->SEQ[0].ENDDELAY = REFRESHBD * ((HALFLOOPPERIOD / REFRESHBD) - ((sizeof(pwmdata) / sizeof(uint16_t))));
NRF_PWM0->LOOP = (0 << PWM_LOOP_CNT_Pos);
NRF_PWM0->TASKS_SEQSTART[0] = 1;
Is it possible to achieve PWM differential output?
Thanks!
