Check the entropy source

nRF54LS05B Datasheet

  1. Apply software reset
  2. Write the CONTROL register ensuring that none of the health tests are bypassed and set the ENABLE bit.
  3. Wait until the STATE is not Reset, Startup or Error. When this is the case, all start-up tests have passed and the entropy source is working correctly.
  4. If the state is Error, select different values for SAMPLINGPERIOD and WARMUPPERIOD and go back to 1.