Rainbow-electronics AT89C5132 Manual do Utilizador descarregar pdf (Página 17)

AT89C5132

4256A–USB–06/03

Answers from Bootloader After each program request, the Host can request the device state and status by send-

ing a DFU_GETSTATUS message.

If the device status indicates an error, the host can send a DFU_CLRSTATUS request

to the device.

Reading the Flash The flow described below allows the user to read data in the Flash memory. A blank

check command on the Flash memory is possible with this flow.

This operation is performed in 2 steps:

1. DFU_DNLOAD request with the read command (6 bytes)

2. DFU_UPLOAD request which correspond to the immediate previous command.

First Request from Host The Host sends a DFU Download request with a Display command in the data field.

Second Request from Host The Host sends a DFU Upload request.

Answers from the Device The device send to the Host the firmware from the specified start address to the end

address.

Command

Identifier data[0] data[1] data[2] data[3] data[4] Description

Id_display_data

03h

00h

start_address end_address

Display Flash Data

01h Blank Check in Flash

OUT

Display_Data (6 bytes)

SETUP

DFU_DNLOAD

ZLP

IN Firmware Packet 1

Firmware Packet 2

Firmware Packet n

OUT

ZLP

SETUP

DFU_UPLOAD

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 30 31

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