I want to use ESP32 as USB to UART converter and I think USBSerial example project can be used for that. Project is located under ESP32 Dev Module examples. I only pressed the 'verify' button and I've got the following error: 'USBCDC' does not name a type
I suppose it's a library problem, but as it's a project example I'm wondering why this error is happening. I also added USBHost library just in case but the problem is not resolved. I'm using Arduino 1.8.19 version.
I included USBHost library using Library Manager but error persists. Do you know the exact name of library to set in the #include? I searched on internet but I didn't find anything.
Anyway, I don't know why this project is not working from the beginning as it's an Arduino example and I didn't modify it:
Looking at USB.H file, there is #include: "USBCDC.h (line 21) which I suppose it contains the USBCDC class. Unfortunately, I can't access to that library trhough the project so I think it's not included when it should.
// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include "sdkconfig.h"
#if CONFIG_TINYUSB_ENABLED
#include "esp_event.h"
#include "USBCDC.h"
#define ARDUINO_USB_ON_BOOT (ARDUINO_USB_CDC_ON_BOOT|ARDUINO_USB_MSC_ON_BOOT|ARDUINO_USB_DFU_ON_BOOT)
ESP_EVENT_DECLARE_BASE(ARDUINO_USB_EVENTS);
typedef enum {
ARDUINO_USB_ANY_EVENT = ESP_EVENT_ANY_ID,
ARDUINO_USB_STARTED_EVENT = 0,
ARDUINO_USB_STOPPED_EVENT,
ARDUINO_USB_SUSPEND_EVENT,
ARDUINO_USB_RESUME_EVENT,
ARDUINO_USB_MAX_EVENT,
} arduino_usb_event_t;
typedef union {
struct {
bool remote_wakeup_en;
} suspend;
} arduino_usb_event_data_t;
class ESPUSB {
public:
ESPUSB(size_t event_task_stack_size=2048, uint8_t event_task_priority=5);
~ESPUSB();
void onEvent(esp_event_handler_t callback);
void onEvent(arduino_usb_event_t event, esp_event_handler_t callback);
bool VID(uint16_t v);
uint16_t VID(void);
bool PID(uint16_t p);
uint16_t PID(void);
bool firmwareVersion(uint16_t version);
uint16_t firmwareVersion(void);
bool usbVersion(uint16_t version);
uint16_t usbVersion(void);
bool usbPower(uint16_t mA);
uint16_t usbPower(void);
bool usbClass(uint8_t _class);
uint8_t usbClass(void);
bool usbSubClass(uint8_t subClass);
uint8_t usbSubClass(void);
bool usbProtocol(uint8_t protocol);
uint8_t usbProtocol(void);
bool usbAttributes(uint8_t attr);
uint8_t usbAttributes(void);
bool webUSB(bool enabled);
bool webUSB(void);
bool productName(const char * name);
const char * productName(void);
bool manufacturerName(const char * name);
const char * manufacturerName(void);
bool serialNumber(const char * name);
const char * serialNumber(void);
bool webUSBURL(const char * name);
const char * webUSBURL(void);
bool enableDFU();
bool begin();
operator bool() const;
private:
uint16_t vid;
uint16_t pid;
String product_name;
String manufacturer_name;
String serial_number;
uint16_t fw_version;
uint16_t usb_version;
uint8_t usb_class;
uint8_t usb_subclass;
uint8_t usb_protocol;
uint8_t usb_attributes;
uint16_t usb_power_ma;
bool webusb_enabled;
String webusb_url;
bool _started;
size_t _task_stack_size;
uint8_t _event_task_priority;
};
extern ESPUSB USB;
#endif /* CONFIG_TINYUSB_ENABLED */
As my goal is to make ESP32 works as a USB to UART converter in order to flash a custom board, I saw on Internet that it can be done just connecting TX and RX signals properly and pressing ESP32 enable button. Am I right?
