CYAPI bulk传输问题

for (int i=1; i<eptCount; i++)
        {
            bool bIn = ((USBDevice->EndPoints[i]->Address & 0x80) == 0x80);
            bool bBulk = (USBDevice->EndPoints[i]->Attributes == 2);
            if (bBulk && bIn) BulkInEpt = (CCyBulkEndPoint *) USBDevice->EndPoints[i];
            if (bBulk && !bIn) BulkOutEpt = (CCyBulkEndPoint *) USBDevice->EndPoints[i];
        }

请问以上四句话代表什么意思？希望能详细点

1. bool bIn = ((USBDevice->EndPoints[i]->Address & 0x80) == 0x80);
   判断usb设备的端点的地址第7位是不是1

2. bool bBulk = (USBDevice->EndPoints[i]->Attributes == 2);
   判断usb设备的端点的属性是不是等时传输

3. if (bBulk && bIn) BulkInEpt = (CCyBulkEndPoint *) USBDevice->EndPoints[i];
   如果地址第7位是1，且是等时传输，那么把设备端点指针赋给 BulkInEpt

4. if (bBulk && !bIn) BulkOutEpt = (CCyBulkEndPoint *) USBDevice->EndPoints[i];
   如果地址第7位不是1，且是等时传输，那么把设备端点指针赋给 BulkOutEpt

如果把enfpoint 0X80换成0X02，是不是就以0X02作为写入通道？