ESP32 Forum

Posted: **Mon Jul 08, 2024 2:02 pm**

Hi,

For my application I'd like to send data over the USB-serial port. However, I cannot find a way of enabling the USB-UART bridge without also enabling logging over this port. Ideally, I'd like to have the following sdkconfig fields to completely disable the ESP_LOGx functions logging to UART/USB.

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CONFIG_ESP_CONSOLE_NONE=y
CONFIG_ESP_CONSOLE_SECONDARY_NONE=y

But, when I am in this mode I seem unable to init the driver/usb_serial_jtag peripheral to manually send data over the USB-serial bridge. Is there a way of doing this? This is my current code to initialize and send data over the usb_serial_jtag driver.

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printf("Configuring USB\n");

usb_serial_jtag_driver_config_t usbConfig = USB_SERIAL_JTAG_DRIVER_CONFIG_DEFAULT();
esp_err_t usbRet = usb_serial_jtag_driver_install(&usbConfig);

printf("USB Configured: %d\n", usbRet);

const char* prompt = "1234567890abcdef\n";
int s = usb_serial_jtag_write_bytes((uint8_t*)prompt, strlen(prompt), portMAX_DELAY);
printf("Bytes send: %d\n", s);

Which outputs:

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Configuring USB
USB Configured: 0
Bytes send: 17

Any help or pointers would be appreciated!

Thanks in advance,
Niels

Posted: **Tue Jul 09, 2024 2:49 am**

FWIW, on latest master this works just fine, including the sdkconfig you want to set. What ESP-IDF version are you on?

Posted: **Wed Jul 10, 2024 3:25 pm**

This is ESP-IDF v5.2.1.

However, I found that if I call `usb_serial_jtag_ll_txfifo_flush` (from `hal/usb_serial_jtag_ll.h`) it also works.

But thanks for checking anyway!

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