feat(tinyusb_cdc): avoid infinite loop when TinyUSB CDC layer hangs (#11904)

* feat(tinyusb_cdc): write timeout Added a timeout check to prevent locking during CDC writes. * fix(usb_cdc): better timeout calculation Co-authored-by: Copilot <[email protected]> * ci(pre-commit): Apply automatic fixes --------- Co-authored-by: Copilot <[email protected]> Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>

Author: 3 people

cores/esp32/USBCDC.cpp

@@ -405,8 +405,11 @@ size_t USBCDC::write(const uint8_t *buffer, size_t size){
 return0;
  }
 size_t to_send = size, so_far = 0;
+// writeTimeout will prevent that TinyUSB failure locks the while(to_send) loop
+uint32_t writeTimeout = millis() + tx_timeout_ms;
 while (to_send){
-if (!tud_cdc_n_connected(itf)){
+if (!tud_cdc_n_connected(itf) || (int32_t)(millis() - writeTimeout) >= 0){
+log_e("USB is disconnected or CDC writing has timed out.");
  size = so_far;
 break;
  }