ESP32 Forum

Posted: **Tue Oct 03, 2023 11:35 am**

Hi,

I know this USB networking feature is work in progress.

I found this example in the master branch https://github.com/espressif/esp-idf/tr ... e/tusb_ncm

I'm trying to run USB audio and this implementation of the USB NCM at the same time and I have it running and working, but at a random time it stops passing data between the network stack and tinyusb.

I get:

Code: Select all

E (663508) tusb_ncm: Failed to send buffer to USB!

From this function:

Code: Select all

static esp_err_t netif_transmit (void *h, void *buffer, size_t len)
{
    if (usb_ncm_send(buffer, len, NULL) != ESP_OK) {
        ESP_LOGE(TAG, "Failed to send buffer to USB!");
    }
    return ESP_OK;
}

My best guess is that there is a bug in the driver (I'm using the synopsis/dwc2 driver)

Do anyone have a suggestion as to how I can debug this issue that sometimes takes over an hour before it shows up, and also sometimes 2 minutes.

Thanks!
Kasper

ESP32 Forum

usb-ncm

usb-ncm