RE: SPIM

hmolesworth — Tue, 05 May 2026 17:23:15 GMT

Maybe try disabling SPIM before setting up the pins:

  // Manual says disable SPI before changing pins, but actually doesn't matter
  NRF_DAC0->ENABLE = 0;               // disable SPI
  
  // Set up pins here
  
  NRF_DAC0->ENABLE = 7;               // enable SPI

Also use an actual pin for CSN (if using SPIM to drive CSN) and be sure to set pin output mode:

This won't work:
  SPI_DAC->PSEL.CSN = NRF_SPIM_PIN_NOT_CONNECTED;
  
  Maybe try something like:
  NRF_GPIO->PIN_CNF[CSPIN]   = 0x301;  // output, high drive high and low H0H1
  NRF_GPIO->PIN_CNF[SCKPIN]  = 0x301;  // output, high drive high and low H0H1
  NRF_GPIO->PIN_CNF[MOSIPIN] = 1;      // output, standard drive S0S1
  SPI_DAC->PSEL.CSN = CSPIN;
  SPI_DAC->PSEL.SCK = NRF_GPIO_PIN_MAP(0, 29);
  SPI_DAC->PSEL.MOSI = NRF_GPIO_PIN_MAP(1, 10);

RE: SPIM

Petar02 — Tue, 05 May 2026 12:58:55 GMT

Sorry same problem stil.