uart_send("  DYNPD - Enable dynamic payload lengths for six pipes (address 0x");
  uart_send_hex(DYNPD);
  uart_send("; current value 0x");
  reg = nrf_getreg(DYNPD);
  uart_send_hex(reg);
  uart_sendl(")");

  uart_send("    DPL_P0:  ");
  uart_sendl(reg & 1<<DPL_P0 ? 1 : 0);
  uart_send("    DPL_P1:  ");
  uart_sendl(reg & 1<<DPL_P1 ? 1 : 0);
  uart_send("    DPL_P2:  ");
  uart_sendl(reg & 1<<DPL_P2 ? 1 : 0);
  uart_send("    DPL_P3:  ");
  uart_sendl(reg & 1<<DPL_P3 ? 1 : 0);
  uart_send("    DPL_P4:  ");
  uart_sendl(reg & 1<<DPL_P4 ? 1 : 0);
  uart_send("    DPL_P5:  ");
  uart_sendl(reg & 1<<DPL_P5 ? 1 : 0);
  uart_sendl("");