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nrf5x: request HFCLK in USB_EVT_READY to fix post-SoftDevice deadlock #3633

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Merged
hathach merged 1 commit into from
May 8, 2026
+6 −0
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nrf5x: request HFCLK in USB_EVT_READY to fix post-SoftDevice deadlock #3633

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6 changes: 6 additions & 0 deletions src/portable/nordic/nrf5x/dcd_nrf5x.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1049,6 +1049,12 @@ void tusb_hal_nrf_power_event(uint32_t event) {
NVIC_EnableIRQ(USBD_IRQn);
}

// Ensure HFCLK is requested in the current context. The hfclk_enable() in
// USB_EVT_DETECTED may have been pre-SoftDevice. After Softdevice is
// enabled, HFXO is physically off again. So any caller that fires
// USB_EVT_READY post-SD would hang here.
hfclk_enable();

// Wait for HFCLK
while (!hfclk_running()) {}

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