USB开发是不是只要实现读取端点数据和写端点数据就可以？

#include "../src/lusb0_usb.h"

#include <stdio.h>



// Enables this example to work with a device running the

// libusb-win32 PIC Benchmark Firmware.

//#define BENCHMARK_DEVICE



//////////////////////////////////////////////////////////////////////////////

// TEST SETUP (User configurable)



// Issues a Set configuration request

#define TEST_SET_CONFIGURATION



// Issues a claim interface request

#define TEST_CLAIM_INTERFACE

#define TEST_BULK_WRITE

// Attempts one bulk read.

#define TEST_BULK_READ



// Attempts one bulk write.

// #define TEST_BULK_WRITE



//////////////////////////////////////////////////////////////////////////////

// DEVICE SETUP (User configurable)



// Device vendor and product id.

#define MY_VID 0x04B4

#define MY_PID 0x1104



// Device configuration and interface id.

#define MY_CONFIG 1

#define MY_INTF 0



// Device endpoint(s)

#define EP_IN 0x86

#define EP_OUT 0x02



// Device of bytes to transfer.

#define BUF_SIZE 2048





usb_dev_handle *open_dev(void)

{

        struct usb_bus *bus;

        struct usb_device *dev;



        for (bus = usb_get_busses(); bus; bus = bus->next)

        {

                for (dev = bus->devices; dev; dev = dev->next)

                {

                        if (dev->descriptor.idVendor == MY_VID

                                && dev->descriptor.idProduct == MY_PID)

                        {

                                return usb_open(dev);

                        }

                }

        }

        return NULL;

}



int main(void)

{

        usb_dev_handle *dev = NULL; /* the device handle */

        unsigned char tmpwrite[BUF_SIZE] = "hello world\n";

        unsigned char tmpread[BUF_SIZE] = {0};

        for (int i = 0; i < BUF_SIZE;i++)

        {

                tmpread[i] = 0;

        }

        int ret;

        void* async_read_context = NULL;

        void* async_write_context = NULL;



        usb_init(); /* initialize the library */

        usb_find_busses(); /* find all busses */

        usb_find_devices(); /* find all connected devices */





        if (!(dev = open_dev()))

        {

                printf("error opening device: \n%s\n", usb_strerror());

                return 0;

        }

        else

        {

                printf("success: device %04X:%04X opened\n", MY_VID, MY_PID);

        }



#ifdef TEST_SET_CONFIGURATION

        if (usb_set_configuration(dev, MY_CONFIG) < 0)

        {

                printf("error setting config #%d: %s\n", MY_CONFIG, usb_strerror());

                usb_close(dev);

                return 0;

        }

        else

        {

                printf("success: set configuration #%d\n", MY_CONFIG);

        }

#endif



#ifdef TEST_CLAIM_INTERFACE

        if (usb_claim_interface(dev, 0) < 0)

        {

                printf("error claiming interface #%d:\n%s\n", MY_INTF, usb_strerror());

                usb_close(dev);

                return 0;

        }

        else

        {

                printf("success: claim_interface #%d\n", MY_INTF);

        }

#endif



#ifdef TEST_BULK_WRITE





#ifdef TEST_ASYNC

        // Running an async write test

        ret = transfer_bulk_async(dev, EP_OUT, tmp, sizeof(tmp), 5000);

#else

        // Running a sync write test

        ret = usb_bulk_write(dev, EP_OUT, (char *)tmpwrite, 2045, 5000);

#endif

        if (ret < 0)

        {

                printf("error writing:\n%s\n", usb_strerror());

        }

        else

        {

                printf("success: bulk write %d bytes\n", ret);

        }

#endif



#ifdef TEST_BULK_READ





        // Running a sync read test

        ret = usb_bulk_read(dev, EP_IN, (char *)tmpread, sizeof(tmpwrite), 4);

        if (ret < 0)

        {

                printf("error reading:\n%s\n", usb_strerror());

        }

        else

        {

                printf("success: bulk read %d bytes\n", ret);

        }

#endif



#ifdef TEST_CLAIM_INTERFACE

        usb_release_interface(dev, 0);

#endif



        if (dev)

        {

                usb_close(dev);

        }

        printf("Done.\n");

        printf((char *)tmpread);

        system("pause");



        return 0;

}