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fix(usb): release the interface on VBUS removal

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A device-side cable yank often skips the DTR=0 line-state change, so the
companion stayed stuck on the USB interface and rejected every BLE
connection until reboot. Treat USBD_MSG_VBUS_REMOVED as a DTR drop.
This commit is contained in:
liquidraver
2026-05-31 15:36:46 +02:00
parent ec982ca15f
commit e445e97fc3
1 changed files with 14 additions and 0 deletions
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zephcore/adapters/usb/ZephyrUSBCDC.cpp
+14
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@@ -134,6 +134,20 @@ static void usbd_msg_callback(struct usbd_context *const ctx,
if (s_dtr_cb) {
s_dtr_cb(dtr_now);
}
} else if (msg->type == USBD_MSG_VBUS_REMOVED) {
/* Physical unplug — VBUS lost. On a device-side cable yank the
* host often never sends a clean DTR=0 line-state change, so the
* CONTROL_LINE_STATE release above won't fire and the companion
* would stay stuck on the USB interface (rejecting every BLE
* connection until reboot). Treat VBUS loss as a DTR drop so the
* interface is handed back to BLE. */
LOG_INF("CDC ACM: VBUS removed (device unplug)");
if (s_dtr_active) {
s_dtr_active = false;
if (s_dtr_cb) {
s_dtr_cb(false);
}
}
}
}