Hi,

I am developing the firmware for an AT89C5131 and have problems with the enumeration process.
I took the example code from ATMEL Website (HID Keyboard example) and wanted to adjust this for my needs.
I don't understand the CONF_LENGTH value in the configuration descriptor. According to the usb spec this is the sum of all the descriptors, that belong to one configuration. So I concluded that sizeof(struct USB_Config_Data) instead of CONF_LENGTH would work. But it doesn't.
Instead CONF_LENGTH is defined as 0x2200 in another header file. But I counted just 93 Bytes at most that are stored in USB_Config_Data.

struct USB_Config_Data
{ struct usb_st_configuration_descriptor cfg;
struct usb_st_interface_descriptor ifc;
struct usb_st_hid_descriptor hid ;
struct usb_st_endpoint_descriptor ep1 ;
unsigned char rep[SIZE_OF_REPORT] ;
};
code struct USB_Config_Data usb_configuration =
{
{ sizeof(struct usb_st_configuration_descriptor), CONFIGURATION, CONF_LENGTH, NB_INTERFACE, CONF_NB,
CONF_INDEX, CONF_ATTRIBUTES, MAX_POWER},
{ sizeof(struct usb_st_interface_descriptor), INTERFACE, INTERFACE_NB, ALTERNATE, NB_ENDPOINT, INTERFACE_CLASS,
INTERFACE_SUB_CLASS, INTERFACE_PROTOCOL, INTERFACE_INDEX },
{ 9, HID, 0x1101, 8, 1, REPORT, 0x3B00 },
{ sizeof(struct usb_st_endpoint_descriptor), ENDPOINT, ENDPOINT_NB_1, EP_ATTRIBUTES_1, EP_SIZE_1, EP_INTERVAL_1 },
{ 0x05,0x01, /* Usage Page (Generic Desktop) */
0x09,0x06, /* Usage (Keyboard) */
...
}
}

I hope anybody can help me.

Thank you in advance.
Sebastian.