esp-idf/examples/peripherals/usb/tusb_console/main/tusb_console_main.c

/* USB Example

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/

// DESCRIPTION:
// This example contains minimal code to make ESP32-S2 based device
// recognizable by USB-host devices as a USB Serial Device printing output from
// the application.

#include <stdio.h>
#include <stdlib.h>
#include <sys/reent.h>
#include "esp_log.h"
#include "esp_vfs.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "tinyusb.h"
#include "tusb_cdc_acm.h"
#include "tusb_console.h"
#include "sdkconfig.h"

static const char *TAG = "example";

void app_main(void)
{
    /* Setting TinyUSB up */
    ESP_LOGI(TAG, "USB initialization");

    tinyusb_config_t tusb_cfg = { 0 }; // the configuration uses default values
    ESP_ERROR_CHECK(tinyusb_driver_install(&tusb_cfg));

    tinyusb_config_cdcacm_t acm_cfg = { 0 }; // the configuration uses default values
    ESP_ERROR_CHECK(tusb_cdc_acm_init(&acm_cfg));

    ESP_LOGI(TAG, "USB initialization DONE");
    while (1) {
        ESP_LOGI(TAG, "log -> UART");
        vTaskDelay(1000 / portTICK_PERIOD_MS);
        fprintf(stdout, "example: print -> stdout\n");
        vTaskDelay(1000 / portTICK_PERIOD_MS);
        fprintf(stderr, "example: print -> stderr\n");
        vTaskDelay(1000 / portTICK_PERIOD_MS);

        esp_tusb_init_console(TINYUSB_CDC_ACM_0); // log to usb
        ESP_LOGI(TAG, "log -> USB");
        vTaskDelay(1000 / portTICK_PERIOD_MS);
        fprintf(stdout, "example: print -> stdout\n");
        vTaskDelay(1000 / portTICK_PERIOD_MS);
        fprintf(stderr, "example: print -> stderr\n");
        vTaskDelay(1000 / portTICK_PERIOD_MS);
        esp_tusb_deinit_console(TINYUSB_CDC_ACM_0); // log to uart
    }
}