diff --git a/cores/esp32/HWCDC.cpp b/cores/esp32/HWCDC.cpp
index cc0202f65..5dcc1b4b5 100644
--- a/cores/esp32/HWCDC.cpp
+++ b/cores/esp32/HWCDC.cpp
@@ -173,9 +173,18 @@ void HWCDC::begin(unsigned long baud)
     if(tx_lock == NULL) {
         tx_lock = xSemaphoreCreateMutex();
     }
-    setRxBufferSize(256);//default if not preset
-    setTxBufferSize(256);//default if not preset
-
+    //RX Buffer default has 256 bytes if not preset
+    if(rx_queue == NULL) {
+        if (!setRxBufferSize(256)) {
+            log_e("HW CDC RX Buffer error");
+        }
+    }
+    //TX Buffer default has 256 bytes if not preset
+    if (tx_ring_buf == NULL) {
+        if (!setTxBufferSize(256)) {
+            log_e("HW CDC TX Buffer error");
+        }    
+    }
     usb_serial_jtag_ll_disable_intr_mask(USB_SERIAL_JTAG_LL_INTR_MASK);
     usb_serial_jtag_ll_clr_intsts_mask(USB_SERIAL_JTAG_LL_INTR_MASK);
     usb_serial_jtag_ll_ena_intr_mask(USB_SERIAL_JTAG_INTR_SERIAL_IN_EMPTY | USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT | USB_SERIAL_JTAG_INTR_BUS_RESET);
diff --git a/cores/esp32/esp32-hal-bt.c b/cores/esp32/esp32-hal-bt.c
index 7b6a54e1a..b4c381aa1 100644
--- a/cores/esp32/esp32-hal-bt.c
+++ b/cores/esp32/esp32-hal-bt.c
@@ -16,8 +16,12 @@
 
 #ifdef CONFIG_BT_ENABLED
 
+#if CONFIG_IDF_TARGET_ESP32
+bool btInUse(){ return true; }
+#else
 // user may want to change it to free resources
 __attribute__((weak)) bool btInUse(){ return true; }
+#endif
 
 #include "esp_bt.h"
 
diff --git a/cores/esp32/esp32-hal-misc.c b/cores/esp32/esp32-hal-misc.c
index 9bc1b3a3a..835cce6f0 100644
--- a/cores/esp32/esp32-hal-misc.c
+++ b/cores/esp32/esp32-hal-misc.c
@@ -209,9 +209,15 @@ bool verifyRollbackLater() { return false; }
 #endif
 
 #ifdef CONFIG_BT_ENABLED
+#if CONFIG_IDF_TARGET_ESP32
+//overwritten in esp32-hal-bt.c
+bool btInUse() __attribute__((weak));
+bool btInUse(){ return false; }
+#else
 //from esp32-hal-bt.c
 extern bool btInUse();
 #endif
+#endif
 
 void initArduino()
 {