AT89C5132-ROTIL datasheet(17/33 Pages) ATMEL

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4256B–USB–03/06

AT89C5132

Device State

This request solicits a report about the state of the device. The state reported is the current state

of the device with no change in state upon transmission of the response. The values specified in

the bState field are identical to those reported in DFU_GETSTATUS.

DFU_ABORT Request

The DFU_ABORT request enables the device to exit from certain states and return to the

DFU_IDLE state. The device sets the OK status on receipt of this request. For more information,

see the corresponding state transition summary.

Programming the

Flash

The firmware image is downloaded via control-write transfers initiated by the DFU_DNLOAD

class-specific request. The host sends between bMaxPacketSize0 and wTransferSize bytes to

the device in a control-write transfer. Following each downloaded block, the host solicits the

device status with the DFU_GETSTATUS request.

As described in the USB DFU Specification, Firmware images for specific devices are, by defini-

tion, vendor specific. It is therefore required that target addresses, record sizes, and all other

information relative to supporting an upgrade are encapsulated within the firmware image file. It

is the responsibility of the device manufacturer and the firmware developer to ensure that their

devices can consume these encapsulated data. With the exception of the DFU file suffix, the

content of the firmware image file is irrelevant to the host.

Firmware image:

•

32 bytes: Command

•

X bytes: X is the number of byte (00h) added before the first significative byte of the

firmware. The X number is calculated to align the beginning of the firmware with the Flash

page. X = start_address [32]. For example, if the start address is 00AFh (175d), X = 175 [32]

= 15.

•

The firmware

•

The DFU Suffix on 16 Bytes

bmRequestType

bRequest

wValue

wIndex

wLength

Data

1010 0001b

DFU_GETSTATE (5)

Zero

Interface (4)

State

bmRequestType

bRequest

wValue

wIndex

wLength

Data

1010 0001b

DFU_ABORT (6)

Zero

Interface (4)

None

Table 16. DFU File Suffix

Offset

Field

Size

Value

Description

- 0

dwCRC

Number

The CRC of the entire file, excluding dwCRC

- 4

bLength

The length of this DFU suffix including dwCRC

- 5

ucDfuSignature

5: 44h

6: 46h

7: 55h

The unique DFU signature field

- 8

bcdDFU

BCD

0100h

DFU specification number

- 10

idVendor

The vendor ID associated with this file. Either FFFFh

or must match device’s vendor ID

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