esp32-C3 usb serial/jtag for flashing AND serial console output

[pataga]

I'm using PlatformIO with Arduino framework in Visual Studio Code on Ubuntu 22.04.

I'm able to flash my ESP32-C3 module using the built-in serial/jtag module (it shows up as /dev/ttyACMx) while monitoring serial debug prints on the uart0 pins (with usb-uart adapter, appears as /dev/ttyUSBx).

However I'm unable to redirect serial prints to the USB CDC peripheral. That makes it pointless as I don't have extra pins for both USB and UART0 in my actual application.

As per
https://docs.espressif.com/projects/esp ... nsole-uart

In ESP-IDF, menuconfig has an option for selecting USB CDC for the serial console for chips with the serial/jtag peripheral.

Is there any way to select this option in the Arduino framework ?

cheers

[michalk]

I'm using the S3, so these options may help:
in your platformio.ini:
build_flags=
-DARDUINO_USB_MODE=1
-DSERIALCONS=USBSerial

Depending on my target SERIALCONS changes, but in my code, I use SERIALCONS and place I would normally use Serial.

I'm also including these, but not sure if they are needed for you:
#include "USB.h"
#include "driver/usb_serial_jtag.h"
#include "esp_vfs_usb_serial_jtag.h"
#include "esp_vfs_dev.h"

[lbernstone]

You don't need all the extra, just the define flags:

Code: Select all

-DARDUINO_USB_MODE=1
-DARDUINO_USB_CDC_ON_BOOT=1

[pataga]

You don't need all the extra, just the define flags:
CODE: SELECT ALL

-DARDUINO_USB_MODE=1
-DARDUINO_USB_CDC_ON_BOOT=1

Thanks for the response guys, this was all that was needed for the C3. My test code :

Code: Select all

#include <Arduino.h>

uint32_t chipId = 0;
void setup() {
	Serial.begin();
	}

void loop() {
	for(int i=0; i<17; i=i+8) {
		chipId |= ((ESP.getEfuseMac() >> (40 - i)) & 0xff) << i;
		}
	Serial.printf("ESP32 Chip model = %s Rev %d\n", ESP.getChipModel(), ESP.getChipRevision());
	Serial.printf("This chip has %d cores\n", ESP.getChipCores());
 	Serial.print("Chip ID: "); Serial.println(chipId);
	delay(3000);
	}