samples: Fix mpsl/timeslot sample on nRF54H20

On this board, the high frequency crystal oscillator is required
or timeslot requests will not be serviced in a timely manner.

Signed-off-by: Gordon Klaus <[email protected]>

Author: gordonklaus

samples/mpsl/timeslot/README.rst

@@ -40,6 +40,9 @@ The timeslot session is closed when any key is pressed in the terminal.
    For the nRF54L Series ``mpsl_timer0`` is the ``timer10`` instance.
    For the nRF54H Series ``mpsl_timer0`` is the ``timer020`` instance.
 
+.. note::
+   For the nRF54H20, if you want to use ``MPSL_TIMESLOT_HFCLK_CFG_NO_GUARANTEE`` then you must request the HFXO earlier using the :c:func:`mpsl_clock_hfclk_request` function.
+
 Building and running
 ********************
 

samples/mpsl/timeslot/src/main.c

@@ -50,17 +50,23 @@ enum mpsl_timeslot_call {
 	CLOSE_SESSION,
 };
 
+#if defined(CONFIG_SOC_SERIES_NRF54HX)
+	#define HFCLK_CFG MPSL_TIMESLOT_HFCLK_CFG_XTAL_GUARANTEED
+#else
+	#define HFCLK_CFG MPSL_TIMESLOT_HFCLK_CFG_NO_GUARANTEE
+#endif /* CONFIG_SOC_SERIES_NRF54HX */
+
 /* Timeslot requests */
 static mpsl_timeslot_request_t timeslot_request_earliest = {
 	.request_type = MPSL_TIMESLOT_REQ_TYPE_EARLIEST,
-	.params.earliest.hfclk = MPSL_TIMESLOT_HFCLK_CFG_NO_GUARANTEE,
+	.params.earliest.hfclk = HFCLK_CFG,
 	.params.earliest.priority = MPSL_TIMESLOT_PRIORITY_NORMAL,
 	.params.earliest.length_us = TIMESLOT_LENGTH_US,
 	.params.earliest.timeout_us = 1000000
 };
 static mpsl_timeslot_request_t timeslot_request_normal = {
 	.request_type = MPSL_TIMESLOT_REQ_TYPE_NORMAL,
-	.params.normal.hfclk = MPSL_TIMESLOT_HFCLK_CFG_NO_GUARANTEE,
+	.params.normal.hfclk = HFCLK_CFG,
 	.params.normal.priority = MPSL_TIMESLOT_PRIORITY_NORMAL,
 	.params.normal.distance_us = TIMESLOT_REQUEST_DISTANCE_US,
 	.params.normal.length_us = TIMESLOT_LENGTH_US