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AN39: USB Interface Description

4.2 Composite Device Enumeration for “Mdm“ Variant

HC15_USB_Interface_v02 Page 25 of 28 2007-04-05

Confidential / Preliminary

Endpoint Descriptor

4.2.2.3 Interface 1 (MODEM port: CDC ACM Data)

Endpoint Descriptor

Table 30: MDM\Configuration Descriptor\Interface0\Endpoint Descriptor

Name Value Dec Hex

bFunctionLength Valid 7 0x07

bDescriptorType ENDPOINT 5 0x05

bEndpointAddress 1 IN

Given endpoint address is an example and can be changed without notice.

129 0x81

bmAttributes.TransferType Interrupt 3 0x03

wMaxPacketSize 16 16 0x0010

bInterval 32 frames (32ms)

Given interval is an example and can be changed without notice.

32 0x20

Table 31: MDM\Configuration Descriptor\Interface1

Name Value Dec Hex

bLength Valid 9 0x09

bDescriptorType INTERFACE 4 0x04

bInterfaceNumber 1 1 0x01

bAlternateSetting 0 0 0x00

bNumEndpoints 2 2 0x02

bInterfaceClass Communication Data 10 0x0A

bInterfaceSubClass 0 0x00

bInterfaceProtocol None 0 0x00

iInterface 3 3 0x03

Table 32: MDM\Configuration Descriptor\Interface1\Endpoint Descriptor

Name Value Dec Hex

bFunctionLength Valid 7 0x07

bDescriptorType ENDPOINT 5 0x05

bEndpointAddress 2 IN

Given endpoint address is an example and can be changed without notice.

130 0x82

bmAttributes.TransferType Bulk 2 0x02

wMaxPacketSize 64 64 0x0040

bInterval 0 0x00

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Siemens HC15 Manuel d'utilisateur Page 25