usb host test app

main.c

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "usb/usb_host.h"

usb_host_client_handle_t client_hdl;
uint8_t dev_addr = 2; 
usb_device_handle_t dev_hdl;
TaskHandle_t async_task_handle;

void client_event_callback(const usb_host_client_event_msg_t *event_msg, void *arg)
{
    if (event_msg->event == USB_HOST_CLIENT_EVENT_NEW_DEV)
    {
        ESP_LOGI("", "client event: %d, address: %d", event_msg->event, event_msg->new_dev.address);
    } else {
        ESP_LOGI("", "USB_HOST_CLIENT_EVENT_DEV_GONE");
        usb_host_device_close(client_hdl, dev_hdl);
    }
}

void app_main(void)
{
    do{

        const usb_host_config_t config = {
            .intr_flags = ESP_INTR_FLAG_LEVEL1,
        };
        esp_err_t err = usb_host_install(&config);
        ESP_LOGI("", "install status: %d", err);

        const usb_host_client_config_t client_config = {
            .async = {
                .client_event_callback = client_event_callback,
                .callback_arg = NULL,
            },
            .max_num_event_msg = 5
        };

        err = usb_host_client_register(&client_config, &client_hdl);
        ESP_LOGI("", "client register status: %d", err);

        while (1)
        {
            uint32_t event_flags;
            if (ESP_OK == usb_host_lib_handle_events(1, &event_flags))
            {
                printf("usb_host_lib_handle_events event_flags: %d\n", event_flags & 0xff);
                usb_host_client_handle_events(client_hdl, 0);
                if (event_flags & USB_HOST_LIB_EVENT_FLAGS_NO_CLIENTS)
                {
                    printf("No more clients\n");
                    do{
                        if(usb_host_device_free_all() != ESP_ERR_NOT_FINISHED) break;
                    }while(1);
                    break;
                }
                if (event_flags & USB_HOST_LIB_EVENT_FLAGS_ALL_FREE)
                {
                    printf("USB_HOST_LIB_EVENT_FLAGS_ALL_FREE\n");
                    usb_host_client_deregister(client_hdl);
                }
            }
            
        }
        usb_host_uninstall();
    }while(1);
}