danielkucera commented on issue #2393:
URL: https://github.com/apache/mynewt-core/issues/2393#issuecomment-712887159
following seems to fix the issue with latest master
```
diff --git a/hw/mcu/nordic/nrf52xxx/src/hal_system.c
b/hw/mcu/nordic/nrf52xxx/src/hal_system.c
index bc390883b..8157e092d 100644
--- a/hw/mcu/nordic/nrf52xxx/src/hal_system.c
+++ b/hw/mcu/nordic/nrf52xxx/src/hal_system.c
@@ -69,6 +69,7 @@ hal_debugger_connected(void)
void
hal_system_clock_start(void)
{
+ NRF_CLOCK->TASKS_HFCLKSTOP=1;
#if MYNEWT_VAL(MCU_LFCLK_SOURCE)
uint32_t regmsk;
uint32_t regval;
diff --git a/hw/mcu/nordic/nrf52xxx/src/hal_timer.c
b/hw/mcu/nordic/nrf52xxx/src/hal_timer.c
index b3730f0e5..5ae77adcf 100644
--- a/hw/mcu/nordic/nrf52xxx/src/hal_timer.c
+++ b/hw/mcu/nordic/nrf52xxx/src/hal_timer.c
@@ -652,6 +652,7 @@ hal_timer_config(int timer_num, uint32_t freq_hz)
#if MYNEWT_VAL_CHOICE(MCU_HFCLK_SOURCE, HFXO)
/* Make sure HFXO is started */
+ /*
if ((NRF_CLOCK->HFCLKSTAT &
(CLOCK_HFCLKSTAT_SRC_Msk | CLOCK_HFCLKSTAT_STATE_Msk)) !=
(CLOCK_HFCLKSTAT_SRC_Msk | CLOCK_HFCLKSTAT_STATE_Msk)) {
@@ -663,6 +664,7 @@ hal_timer_config(int timer_num, uint32_t freq_hz)
}
}
}
+ */
#endif
hwtimer = bsptimer->tmr_reg;
```
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