AT90USB128X Просмотр технического описания (PDF) - Atmel Corporation

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AT90USB128X

USB DFU Bootloader Datasheet

Atmel Corporation 

4.7.4

Answers from the Device to a Blank Check Command

The Host controller sends a GET_STATUS request to the device. Once internal blank check has

been completed, the device sends its status.

• If the device status is “OK”:

the device memory is then blank and the device waits for the next Host request.

• If the device status is “errCHECK_ERASED”:

the device memory is not blank. The device waits for an DFU_UPLOAD request to send the

first address where the byte is not 0xFF.

4.8 Reading Configuration Information or Manufacturer Information

The flow described hereafter allows the user to read the configuration or manufacturer

information.

4.8.1

Requests From Host

To start the programming operation, the Host sends DFU_DNLOAD request with the Read com-

mand in the data field (2 bytes).

SETUP

DFU_DNLOAD

OUT

IN

Read_command (2 bytes)

ZLP

4.8.2

Command Identifier data[0]

00h

Id_read_command

05h

01h

data[1]

00h

01h

02h

30h

31h

60h

61h

data[2]

data[3]

data[4]

Description

Read Bootloader Version

Read Device boot ID1

Read Device boot ID2

Read Manufacturer Code

Read Family Code

Read Product Name

Read Product Revision

Answers from Bootloader

The device has two possible answers to a DFU_GETSTATUS request:

• If the chip is protected from program access, an “err_VENDOR” status is returned to the

Host.

• Otherwise, the device status is “OK“. The Host can send a DFU_UPLOAD request to the

device in order to get the value of the requested field.

12

7618C–AVR–07/08

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