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eclipse-threadx / usbx

Eclipse ThreadX - USBX is a high-performance USB host, device, and on-the-go (OTG) embedded stack, that is fully integrated with Eclipse ThreadX RTOS
https://github.com/eclipse-threadx/rtos-docs/blob/main/rtos-docs/usbx/index.md
MIT License
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Example of device MSD+CDC #46

Closed maxkunes closed 2 years ago

maxkunes commented 2 years ago

I have an embedded device that I currently run a USB slave MSD on to access the internal filesystem. I would also like to have a serial communication so that I can use teraterm to talk and see output from this device on that same port. I know USBX supports both of these functionalities (I've tried both and they work), but I'm not skilled enough to develop a composite descriptor for this use case as it gets complicated when you have multiple interfaces with IADs (I think mixed in). It also seems that USBX only supports one device "port" at once, so I cannot just use two USB ports for this function.

Is there any way someone could show what a composite descriptor would look like for a USB device that has MSD and CDC? And if possible how this can be initialized on the USBx stack side?

xiaocq2001 commented 2 years ago

Here is example for your reference: there is one configuration for the high speed device; there are 3 interfaces in the configuration; interface 0 and 1 for CDC, uses endpoint 0x81, 0x02, 0x83; interface 3 for storage, uses endpoint 0x04 and 0x85.

/* Device Descriptor */
0x12,       /* bLength : 18 */
0x01,       /* bDescriptorType */
0x00, 0x02, /* bcdUSB : 0x0200 : USB 2.0 */
0xef,       /* bDeviceClass : 0xEF : MISC */
0x02,       /* bDeviceSubClass : 0x02 */
0x01,       /* bDeviceProtocol : 0x01 */
0x40,       /* bMaxPacketSize0 : 64 : 64 */
0x84, 0x84, /* idVendor : 0x8484 : Express Logic */
0x00, 0x00, /* idProduct */
0x00, 0x01, /* bcdDevice */
0x01,       /* iManufacturer */
0x02,       /* iProduct */
0x03,       /* iSerialNumber */
0x01,       /* bNumConfigurations */
  /* Device_Qualifier Descriptor */
  0x0a,       /* bLength */
  0x06,       /* bDescriptorType */
  0x00, 0x02, /* bcdUSB : 0x0200 : USB 2.0 */
  0x02,       /* bDeviceClass : 0x02 */
  0x00,       /* bDeviceSubClass : 0x00 : Reset */
  0x00,       /* bDeviceProtocol : 0x00 : Reset */
  0x40,       /* bMaxPacketSize0 : 64 : 64 */
  0x01,       /* bNumConfigurations */
  0x00,       /* bReserved */
  /* Configuration Descriptor, total 98 */
  0x09,       /* bLength */
  0x02,       /* bDescriptorType */
  0x62, 0x00, /* wTotalLength : 98 */
  0x03,       /* bNumInterfaces */
  0x01,       /* bConfigurationValue */
  0x00,       /* iConfiguration */
  0x40,       /* bmAttributes */
              /* D6 : 0x1 : Self-powered */
              /* D5, Remote Wakeup : 0x0 : Not supported */
  0x00,       /* bMaxPower : 0 : 0mA */
    /* Interface Association Descriptor */
    0x08,       /* bLength */
    0x0b,       /* bDescriptorType */
    0x00,       /* bFirstInterface */
    0x02,       /* bInterfaceCount */
    0x02,       /* bFunctionClass : 0x02 */
    0x02,       /* bFunctionSubClass : 0x02 */
    0x00,       /* bFunctionProtocol : 0x00 : Reset */
    0x00,       /* iFunction */
      /* Interface Descriptor */
      0x09,       /* bLength */
      0x04,       /* bDescriptorType */
      0x00,       /* bInterfaceNumber */
      0x00,       /* bAlternateSetting */
      0x01,       /* bNumEndpoints */
      0x02,       /* bInterfaceClass : 0x02 : CDC Control */
      0x02,       /* bInterfaceSubClass : 0x02 */
      0x01,       /* bInterfaceProtocol : 0x01 */
      0x00,       /* iInterface */
        /* CDC Header Functional Descriptor */
        0x05,       /* bLength */
        0x24,       /* bDescriptorType */
        0x00,       /* bDescriptorSubtype */
        0x10, 0x01, /* bcdCDC : 0x0110 : CDC 1.1 */
          /* CDC Abstract Control Management Functional Descriptor */
          0x04,       /* bLength */
          0x24,       /* bDescriptorType */
          0x02,       /* bDescriptorSubtype */
          0x0e,       /* bmCapabilities */
                      /* D3, notification Network_Connection : 0x1 : Supported */
                      /* D2, request Send_Break : 0x1 : Supported */
                      /* D1, request Set_Line_Coding Set_Control_Line_State Get_Line_Coding and notification Serial_State : 0x1 : Supported */
                      /* D0, request Set_Comm_Feature Clear_Comm_Feature and Get_Comm_Feature : 0x0 : Not supported */
          /* CDC Union Functional Descriptor (1 slave interface) */
          0x05,       /* bLength */
          0x24,       /* bDescriptorType */
          0x06,       /* bDescriptorSubtype */
          0x00,       /* bMasterInterface */
          0x01,       /* bSlaveInterface0 */
          /* CDC Call Management Functional Descriptor */
          0x05,       /* bLength */
          0x24,       /* bDescriptorType */
          0x01,       /* bDescriptorSubtype */
          0x00,       /* bmCapabilities */
                      /* D1 : 0x0 : Send/receive call management over COMM Class interface */
                      /* D0 : 0x0 : Do not handle call management itself */
          0x01,       /* bDataInterface */
        /* Endpoint Descriptor */
        0x07,       /* bLength */
        0x05,       /* bDescriptorType */
        0x83,       /* bEndpointAddress */
                    /* D7, Direction : 0x01 */
                    /* D3..0, Endpoint number : 3 */
        0x03,       /* bmAttributes */
                    /* D1..0, Trasfer Type : 0x3 : Interrupt */
                    /* D3..2, Synchronization Type : 0x0 : No Synchronization */
                    /* D5..4, Usage Type : 0x0 : Data endpoint */
        0x08, 0x00, /* wMaxPacketSize : 8 */
                    /* D10..0, Max Packet Size : 8 */
                    /* D12..11, Additional transactions : 0x00 */
        0xff,       /* bInterval : 255 */
      /* Interface Descriptor */
      0x09,       /* bLength */
      0x04,       /* bDescriptorType */
      0x01,       /* bInterfaceNumber */
      0x00,       /* bAlternateSetting */
      0x02,       /* bNumEndpoints */
      0x0a,       /* bInterfaceClass : 0x0A : CDC Data */
      0x00,       /* bInterfaceSubClass : 0x00 : Undefined */
      0x00,       /* bInterfaceProtocol : 0x00 : Undefined */
      0x00,       /* iInterface */
        /* Endpoint Descriptor */
        0x07,       /* bLength */
        0x05,       /* bDescriptorType */
        0x02,       /* bEndpointAddress */
                    /* D7, Direction : 0x00 */
                    /* D3..0, Endpoint number : 2 */
        0x02,       /* bmAttributes */
                    /* D1..0, Trasfer Type : 0x2 : Bulk */
                    /* D3..2, Synchronization Type : 0x0 : No Synchronization */
                    /* D5..4, Usage Type : 0x0 : Data endpoint */
        0x00, 0x02, /* wMaxPacketSize : 512 */
                    /* D10..0, Max Packet Size : 512 */
                    /* D12..11, Additional transactions : 0x00 */
        0x00,       /* bInterval : 0 : 0 */
        /* Endpoint Descriptor */
        0x07,       /* bLength */
        0x05,       /* bDescriptorType */
        0x81,       /* bEndpointAddress */
                    /* D7, Direction : 0x01 */
                    /* D3..0, Endpoint number : 1 */
        0x02,       /* bmAttributes */
                    /* D1..0, Trasfer Type : 0x2 : Bulk */
                    /* D3..2, Synchronization Type : 0x0 : No Synchronization */
                    /* D5..4, Usage Type : 0x0 : Data endpoint */
        0x00, 0x02, /* wMaxPacketSize : 512 */
                    /* D10..0, Max Packet Size : 512 */
                    /* D12..11, Additional transactions : 0x00 */
        0x00,       /* bInterval : 0 : 0 */
    /* Interface Descriptor */
    0x09,       /* bLength */
    0x04,       /* bDescriptorType */
    0x02,       /* bInterfaceNumber */
    0x00,       /* bAlternateSetting */
    0x02,       /* bNumEndpoints */
    0x08,       /* bInterfaceClass : 0x08 : Mass Storage */
    0x06,       /* bInterfaceSubClass : 0x06 */
    0x50,       /* bInterfaceProtocol : 0x50 */
    0x00,       /* iInterface */
      /* Endpoint Descriptor */
      0x07,       /* bLength */
      0x05,       /* bDescriptorType */
      0x04,       /* bEndpointAddress */
                  /* D7, Direction : 0x00 */
                  /* D3..0, Endpoint number : 4 */
      0x02,       /* bmAttributes */
                  /* D1..0, Transfer Type : 0x2 : Bulk */
                  /* D3..2, Synchronization Type : 0x0 : No Synchronization */
                  /* D5..4, Usage Type : 0x0 : Data endpoint */
      0x00, 0x02, /* wMaxPacketSize : 512 */
                  /* D10..0, Max Packet Size : 512 */
                  /* D12..11, Additional transactions : 0x00 */
      0x00,       /* bInterval : 0 : 0 */
      /* Endpoint Descriptor */
      0x07,       /* bLength */
      0x05,       /* bDescriptorType */
      0x85,       /* bEndpointAddress */
                  /* D7, Direction : 0x01 */
                  /* D3..0, Endpoint number : 5 */
      0x02,       /* bmAttributes */
                  /* D1..0, Trasfer Type : 0x2 : Bulk */
                  /* D3..2, Synchronization Type : 0x0 : No Synchronization */
                  /* D5..4, Usage Type : 0x0 : Data endpoint */
      0x00, 0x02, /* wMaxPacketSize : 512 */
                  /* D10..0, Max Packet Size : 512 */
                  /* D12..11, Additional transactions : 0x00 */
      0x00,       /* bInterval : 0 : 0 */

When registering classes, you can refer to following code for CDC and storage:

/* Register class for configuration value 1, interface 0 and 1 (CDC-ACM).  */
    status =  ux_device_stack_class_register(_ux_system_slave_class_cdc_acm_name, ux_device_class_cdc_acm_entry,
                                             1, 0, &cdc_acm_parameter);
/* Register class for configuration value 1, interface 2 (storage).  */
    status =  ux_device_stack_class_register(_ux_system_slave_class_storage_name, ux_device_class_storage_entry, 
                                                1, 2, (VOID *)&storage_parameter);
maxkunes commented 2 years ago

Hmm, that setup doesn't seem to work for me. Windows doesn't seem to like it and the device keeps mounting and unmounting a serial port, but I never see the MSC device.

I've recorded a pcap file of the issues, in this dump, the relevant filter to see the USB transactions are "usb.src == "2.46.0".

Here is a screenshot: image

Here is the file: https://easyupload.io/wbo0so (can't attach directly to this issue because of the file type)

I'll note that it seems the system spends quite a lot of time in this code (mcimx6_endpoint_flush.c) while these issues are occurring :

        /* The flushing of the endpoint may take a while. We need to wait for the operation to be completed.  */
        do
        {
            /* Read the EPFLUSH register.  */
            mcimx6_register = _ux_dcd_mcimx6_register_read(dcd_mcimx6, UX_DCD_MCIMX6_32BIT_REG, UX_DCD_MCIMX6_EPFLUSH);

        } while (mcimx6_register != 0);

My initialization code looks like this:

UINT status =
            _ux_device_stack_initialize(usb_cdc_msc_framework, sizeof(usb_cdc_msc_framework), usb_cdc_msc_framework, sizeof(usb_cdc_msc_framework),
                                        usbfs_string_framework, sizeof(usbfs_string_framework), usbfs_language_id_framework, sizeof(usbfs_language_id_framework), nullptr);

        if (status != UX_SUCCESS)
            return false;

        parameter.ux_slave_class_cdc_acm_instance_activate = cb_ux_slave_class_cdc_acm_instance_activate;
        parameter.ux_slave_class_cdc_acm_instance_deactivate = cb_ux_slave_class_cdc_acm_instance_deactivate;
        parameter.ux_slave_class_cdc_acm_parameter_change = cb_ux_slave_class_cdc_acm_parameter_change;

        /* Initilize the device storage class. The class is connected with interface
         * 0 on configuration 1. */
        status = _ux_device_stack_class_register(_ux_system_slave_class_cdc_acm_name, ux_device_class_cdc_acm_entry, 1, 0, (VOID *)&parameter);

        if (status != UX_SUCCESS)
            return false;

        usbfs_storage_parameter.ux_slave_class_storage_parameter_number_lun = 1;

        /* Initialize the storage class parameters for reading/writing to the Flash
         * Disk. */
        usbfs_storage_parameter.ux_slave_class_storage_parameter_lun[0].ux_slave_class_storage_media_last_lba = USBFS_LAST_BLOCK_INDEX;
        usbfs_storage_parameter.ux_slave_class_storage_parameter_lun[0].ux_slave_class_storage_media_block_length = USBFS_BLOCK_SIZE; // needs to be 512, not sure if this needs to match
        // filessytem
        usbfs_storage_parameter.ux_slave_class_storage_parameter_lun[0].ux_slave_class_storage_media_type = 0;
        usbfs_storage_parameter.ux_slave_class_storage_parameter_lun[0].ux_slave_class_storage_media_removable_flag = 0x80;
        usbfs_storage_parameter.ux_slave_class_storage_parameter_lun[0].ux_slave_class_storage_media_read = usbfs_media_read;
        usbfs_storage_parameter.ux_slave_class_storage_parameter_lun[0].ux_slave_class_storage_media_write = usbfs_media_write;
        usbfs_storage_parameter.ux_slave_class_storage_parameter_lun[0].ux_slave_class_storage_media_status = usbfs_media_status;
        usbfs_storage_parameter.ux_slave_class_storage_parameter_lun[0].ux_slave_class_storage_media_flush = usbfs_media_flush;

        /* Initilize the device storage class. The class is connected with interface
         * 0 on configuration 1. */
        status = _ux_device_stack_class_register(_ux_system_slave_class_storage_name, _ux_device_class_storage_entry, 1, 2, (VOID *)&usbfs_storage_parameter);

        if (status != UX_SUCCESS)
            return false;

        /* Register the K64 USB device controllers available in this system */
        _ux_dcd_mcimx6_initialize(usb_device_base());

        /* Init the USB interrupt. */
        usb_device_interrupt_setup(USB_DEVICE_INTERRUPT_PRIORITY);

and the frameworks:


UCHAR usb_cdc_msc_framework[] = {
        /* Device Descriptor */
        0x12,       /* bLength : 18 */
        0x01,       /* bDescriptorType */
        0x00, 0x02, /* bcdUSB : 0x0200 : USB 2.0 */
        0xef,       /* bDeviceClass : 0xEF : MISC */
        0x02,       /* bDeviceSubClass : 0x02 */
        0x01,       /* bDeviceProtocol : 0x01 */
        0x40,       /* bMaxPacketSize0 : 64 : 64 */
        0x84, 0x84, /* idVendor : 0x8484 : Express Logic */
        0x00, 0x00, /* idProduct */
        0x00, 0x01, /* bcdDevice */
        0x01,       /* iManufacturer */
        0x02,       /* iProduct */
        0x03,       /* iSerialNumber */
        0x01,       /* bNumConfigurations */
          /* Device_Qualifier Descriptor */
          0x0a,       /* bLength */
          0x06,       /* bDescriptorType */
          0x00, 0x02, /* bcdUSB : 0x0200 : USB 2.0 */
          0x02,       /* bDeviceClass : 0x02 */
          0x00,       /* bDeviceSubClass : 0x00 : Reset */
          0x00,       /* bDeviceProtocol : 0x00 : Reset */
          0x40,       /* bMaxPacketSize0 : 64 : 64 */
          0x01,       /* bNumConfigurations */
          0x00,       /* bReserved */
          /* Configuration Descriptor, total 98 */
          0x09,       /* bLength */
          0x02,       /* bDescriptorType */
          0x62, 0x00, /* wTotalLength : 98 */
          0x03,       /* bNumInterfaces */
          0x01,       /* bConfigurationValue */
          0x00,       /* iConfiguration */
          0x40,       /* bmAttributes */
                      /* D6 : 0x1 : Self-powered */
                      /* D5, Remote Wakeup : 0x0 : Not supported */
          0x00,       /* bMaxPower : 0 : 0mA */
            /* Interface Association Descriptor */
            0x08,       /* bLength */
            0x0b,       /* bDescriptorType */
            0x00,       /* bFirstInterface */
            0x02,       /* bInterfaceCount */
            0x02,       /* bFunctionClass : 0x02 */
            0x02,       /* bFunctionSubClass : 0x02 */
            0x00,       /* bFunctionProtocol : 0x00 : Reset */
            0x00,       /* iFunction */
              /* Interface Descriptor */
              0x09,       /* bLength */
              0x04,       /* bDescriptorType */
              0x00,       /* bInterfaceNumber */
              0x00,       /* bAlternateSetting */
              0x01,       /* bNumEndpoints */
              0x02,       /* bInterfaceClass : 0x02 : CDC Control */
              0x02,       /* bInterfaceSubClass : 0x02 */
              0x01,       /* bInterfaceProtocol : 0x01 */
              0x00,       /* iInterface */
                /* CDC Header Functional Descriptor */
                0x05,       /* bLength */
                0x24,       /* bDescriptorType */
                0x00,       /* bDescriptorSubtype */
                0x10, 0x01, /* bcdCDC : 0x0110 : CDC 1.1 */
                  /* CDC Abstract Control Management Functional Descriptor */
                  0x04,       /* bLength */
                  0x24,       /* bDescriptorType */
                  0x02,       /* bDescriptorSubtype */
                  0x0e,       /* bmCapabilities */
                              /* D3, notification Network_Connection : 0x1 : Supported */
                              /* D2, request Send_Break : 0x1 : Supported */
                              /* D1, request Set_Line_Coding Set_Control_Line_State Get_Line_Coding and notification Serial_State : 0x1 : Supported */
                              /* D0, request Set_Comm_Feature Clear_Comm_Feature and Get_Comm_Feature : 0x0 : Not supported */
                  /* CDC Union Functional Descriptor (1 slave interface) */
                  0x05,       /* bLength */
                  0x24,       /* bDescriptorType */
                  0x06,       /* bDescriptorSubtype */
                  0x00,       /* bMasterInterface */
                  0x01,       /* bSlaveInterface0 */
                  /* CDC Call Management Functional Descriptor */
                  0x05,       /* bLength */
                  0x24,       /* bDescriptorType */
                  0x01,       /* bDescriptorSubtype */
                  0x00,       /* bmCapabilities */
                              /* D1 : 0x0 : Send/receive call management over COMM Class interface */
                              /* D0 : 0x0 : Do not handle call management itself */
                  0x01,       /* bDataInterface */
                /* Endpoint Descriptor */
                0x07,       /* bLength */
                0x05,       /* bDescriptorType */
                0x83,       /* bEndpointAddress */
                            /* D7, Direction : 0x01 */
                            /* D3..0, Endpoint number : 3 */
                0x03,       /* bmAttributes */
                            /* D1..0, Trasfer Type : 0x3 : Interrupt */
                            /* D3..2, Synchronization Type : 0x0 : No Synchronization */
                            /* D5..4, Usage Type : 0x0 : Data endpoint */
                0x08, 0x00, /* wMaxPacketSize : 8 */
                            /* D10..0, Max Packet Size : 8 */
                            /* D12..11, Additional transactions : 0x00 */
                0xff,       /* bInterval : 255 */
              /* Interface Descriptor */
              0x09,       /* bLength */
              0x04,       /* bDescriptorType */
              0x01,       /* bInterfaceNumber */
              0x00,       /* bAlternateSetting */
              0x02,       /* bNumEndpoints */
              0x0a,       /* bInterfaceClass : 0x0A : CDC Data */
              0x00,       /* bInterfaceSubClass : 0x00 : Undefined */
              0x00,       /* bInterfaceProtocol : 0x00 : Undefined */
              0x00,       /* iInterface */
                /* Endpoint Descriptor */
                0x07,       /* bLength */
                0x05,       /* bDescriptorType */
                0x02,       /* bEndpointAddress */
                            /* D7, Direction : 0x00 */
                            /* D3..0, Endpoint number : 2 */
                0x02,       /* bmAttributes */
                            /* D1..0, Trasfer Type : 0x2 : Bulk */
                            /* D3..2, Synchronization Type : 0x0 : No Synchronization */
                            /* D5..4, Usage Type : 0x0 : Data endpoint */
                0x00, 0x02, /* wMaxPacketSize : 512 */
                            /* D10..0, Max Packet Size : 512 */
                            /* D12..11, Additional transactions : 0x00 */
                0x00,       /* bInterval : 0 : 0 */
                /* Endpoint Descriptor */
                0x07,       /* bLength */
                0x05,       /* bDescriptorType */
                0x81,       /* bEndpointAddress */
                            /* D7, Direction : 0x01 */
                            /* D3..0, Endpoint number : 1 */
                0x02,       /* bmAttributes */
                            /* D1..0, Trasfer Type : 0x2 : Bulk */
                            /* D3..2, Synchronization Type : 0x0 : No Synchronization */
                            /* D5..4, Usage Type : 0x0 : Data endpoint */
                0x00, 0x02, /* wMaxPacketSize : 512 */
                            /* D10..0, Max Packet Size : 512 */
                            /* D12..11, Additional transactions : 0x00 */
                0x00,       /* bInterval : 0 : 0 */
            /* Interface Descriptor */
            0x09,       /* bLength */
            0x04,       /* bDescriptorType */
            0x02,       /* bInterfaceNumber */
            0x00,       /* bAlternateSetting */
            0x02,       /* bNumEndpoints */
            0x08,       /* bInterfaceClass : 0x08 : Mass Storage */
            0x06,       /* bInterfaceSubClass : 0x06 */
            0x50,       /* bInterfaceProtocol : 0x50 */
            0x00,       /* iInterface */
              /* Endpoint Descriptor */
              0x07,       /* bLength */
              0x05,       /* bDescriptorType */
              0x04,       /* bEndpointAddress */
                          /* D7, Direction : 0x00 */
                          /* D3..0, Endpoint number : 4 */
              0x02,       /* bmAttributes */
                          /* D1..0, Transfer Type : 0x2 : Bulk */
                          /* D3..2, Synchronization Type : 0x0 : No Synchronization */
                          /* D5..4, Usage Type : 0x0 : Data endpoint */
              0x00, 0x02, /* wMaxPacketSize : 512 */
                          /* D10..0, Max Packet Size : 512 */
                          /* D12..11, Additional transactions : 0x00 */
              0x00,       /* bInterval : 0 : 0 */
              /* Endpoint Descriptor */
              0x07,       /* bLength */
              0x05,       /* bDescriptorType */
              0x85,       /* bEndpointAddress */
                          /* D7, Direction : 0x01 */
                          /* D3..0, Endpoint number : 5 */
              0x02,       /* bmAttributes */
                          /* D1..0, Trasfer Type : 0x2 : Bulk */
                          /* D3..2, Synchronization Type : 0x0 : No Synchronization */
                          /* D5..4, Usage Type : 0x0 : Data endpoint */
              0x00, 0x02, /* wMaxPacketSize : 512 */
                          /* D10..0, Max Packet Size : 512 */
                          /* D12..11, Additional transactions : 0x00 */
              0x00       /* bInterval : 0 : 0 */
};

UCHAR usbfs_string_framework[] = {
    /* Manufacturer string descriptor : Index 1 */
    0x09, 0x04, 0x01, 0x0c, 0x45, 0x78, 0x70, 0x72, 0x65, 0x73, 0x20, 0x4c, 0x6f, 0x67, 0x69, 0x63,

    /* Product string descriptor : Index 2 */
    0x09, 0x04, 0x02, 0x0a, 0x46, 0x6c, 0x61, 0x73, 0x68, 0x20, 0x44, 0x69, 0x73, 0x6b,

    /* Serial Number string descriptor : Index 3 */
    0x09, 0x04, 0x03, 0x04, 0x30, 0x30, 0x30, 0x31};

UCHAR usbfs_language_id_framework[] = {
    /* English. */
    0x09, 0x04};
maxkunes commented 2 years ago

Hmm, I found one issue that seems to allow everything to work.

My version of USBX had the following defines in the support files (ux_cdc_mcimx6.h) :

#define UX_DCD_MCIMX6_MAX_ED                                           8    
#define UX_DCD_MCIMX6_MAX_ED_VALUE                               4

While it seems on a newer version of the library, they are set to this: (which seems correct, 8 bidir endpoints).

#define UX_DCD_MCIMX6_MAX_ED                                           16   
#define UX_DCD_MCIMX6_MAX_ED_VALUE                               8

I didn't catch this as both files say the same version; /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */

But one of them is updated...

xiaocq2001 commented 2 years ago

Thanks for the information.

From the macros, I guess the change tried to reduce managed number of endpoints to reduce memory usage, but for composite device the number of endpoints are increased (MSC needs 2 endpoints and CDC ACM needs 3 endpoints, plus 1 control endpoint).

yuxin-azrtos commented 2 years ago

Closing.. Feel free to reopen it if you have additional questions.