cpu/nrf53: setup XL1/XL2 pins for using external 32K osc if needed

Signed-off-by: Dylan Laduranty <dylan.laduranty@mesotic.com>
RIOT-OS · Jul 7, 2023 · f9c5571 · f9c5571
1 parent 653ea3a
commit f9c5571
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/cpu/nrf53/cpu.c b/cpu/nrf53/cpu.c
@@ -61,6 +61,13 @@ static_assert((CLOCK_CORECLOCK == MHZ(128)) || CLOCK_CORECLOCK == MHZ(64));
     /* For now, disable the unused network core */
     NRF_RESET_S->NETWORK.FORCEOFF = 1;
 
+#if defined(MODULE_PERIPH_RTT) && (CLOCK_LFCLK==CLOCK_LFCLKSRC_SRC_LFXO)
+    /* Enable P0.00 and P0.01 as XL1/XL2 if LXFO is selected */
+    NRF_P0_S->PIN_CNF[0] &= ~GPIO_PIN_CNF_MCUSEL_Msk;
+    NRF_P0_S->PIN_CNF[0] |= GPIO_PIN_CNF_MCUSEL_Peripheral << GPIO_PIN_CNF_MCUSEL_Pos;
+    NRF_P0_S->PIN_CNF[1] &= ~GPIO_PIN_CNF_MCUSEL_Msk;
+    NRF_P0_S->PIN_CNF[1] |= GPIO_PIN_CNF_MCUSEL_Peripheral << GPIO_PIN_CNF_MCUSEL_Pos;
+#endif
     /* call cortexm default initialization */
     cortexm_init();