PROGRAMING_EEPROM_FTDI.pdf

Future Technology Devices International Ltd.

Application Note AN_105

FTDI Device EEPROM Programming

Using a Vinculum VNC1L

Document Reference No.: FT_000078

Version 1.00

Issue Date: 2008-09-23

This document describes a C application that uses the VNC1L to program the EEPROM of an

FTDI peripheral device.

Future Technology Devices International Limited (FTDI)

373 Scotland Street, Glasgow G5 8QB United Kingdom

Tel.: +44 (0) 141 429 2777 Fax: + 44 (0) 141 429 2758

EMail (Support): vinculum.support@ftdichip.com Web: http://www.ftdichip.com

Document Reference No.: FT_000078

FTDI Device EEPROM Programming Using a Vinculum VNC1L Application Note AN_105

Version 1.00

Clearance No.: FTDI# 59

Table of Contents

1 Introduction............................................................................................ 2

1.1 Conventions ......................................................................................................... 2

1.2 Acronyms and Abbreviations ............................................................................. 3

2 Project Setup ......................................................................................... 4

2.1 Hardware Setup ................................................................................................... 4

2.2 Software Setup .................................................................................................... 5

2.2.1 TTL-232R-3V3 Drivers ............................................................................................................ 5

2.2.2 VNC1L Firmware ..................................................................................................................... 5

2.2.3 Alternative Application Code ................................................................................................... 5

3 EEPROM Firmware Commands ............................................................ 6

3.1 FTDI Erase EEPROM (FEE) ................................................................................. 6

3.2 Write EEPROM (FEW) .......................................................................................... 6

3.3 Read EEPROM (FER) ........................................................................................... 6

4 Application Code ................................................................................... 7

4.1 Subroutines for Setting up and Connecting to the TTL-232R-3V3 .................. 7

4.2 Subroutines for Setting up the VNC1L .............................................................. 7

4.2.1 Queue Status ........................................................................................................................... 8

4.2.2 Read Responses from VNC1L ................................................................................................ 8

4.2.3 Write Firmware commands to VNC1L ..................................................................................... 9

4.2.4 Shortened Command Set command (SCS) .......................................................................... 10

4.2.5 Firmware Version command (FWV) ...................................................................................... 10

4.2.6 Query Port command (QP) .................................................................................................... 10

4.2.7 Select Interface command (SC) ............................................................................................ 11

4.2.8 Query Device command (QD) ............................................................................................... 11

4.3 Subroutines for Reading and Writing to the EEPROM ................................... 13

4.3.1 Reading from an EEPROM (FER) ......................................................................................... 13

4.3.2 Writing to an EEPROM (FEW) .............................................................................................. 14

4.3.3 Writing to the EEPROM of an FTxxxR chip ........................................................................... 15

4.3.4 Checksum .............................................................................................................................. 17

5 Contact Information............................................................................. 18

Appendix A - References .......................................................................... 19

Appendix B - Revision History .................................................................. 20

Document Reference No.: FT_000078

FTDI Device EEPROM Programming Using a Vinculum VNC1L Application Note AN_105

Version 1.00

Clearance No.: FTDI# 59

1 Introduction

The VNC1L is a USB host controller IC which allows data to be transferred via USB to an FTDI peripheral

device (FTxxx). The FTDI devices may use an EEPROM to store USB device descriptors that can be

programmed over the USB. Programming is commonly done by connecting the FTDI device to a PC,

installing the required FTDI drivers and using the driver API functions to program the EEPROM of the

device. This application note describes how to configure the VNC1L to program the EEPROM of an FTDI

device.

Firmware available for the VNC1L allows the user to read, write and erase the EEPROM of an FTDI device.

These firmware commands can be used to reprogram the VID, PID, serial number, manufacturer string

and description string within the EEPROM of all existing FTDI peripheral devices connected to the VNC1L.

This can be achieved using a C application on a PC. The example code for Microsoft ® Visual Studio ® 2008

is available by request under NDA. Contact support1@ftdichip.com .

Any software code examples given in this document are for information only. The examples are not

guaranteed and are not supported by FTDI.

1.1 Conventions

The following conventions are used in this document:

Convention

Description

Monospaced type

Indicates input or output from the monitor.

Boldface monospaced type

Indicates input supplied by the user.

Italic monospaced type

Indicates binary characters (ASCII values of

characters).

Important

Signals that the information supplied is

important.

Note

Provide additional information about a topic.

Warning

Indicate potential damage to equipment or

loss of data.

Is used to show a range. For instance, a

range of bits 15:9 is bits 15 to 9 (inclusive)

of a binary value.

VNC1L

Indicated information specific to the VNC1L.

carriage return (0x0D).

space (0x20).

Represents a single decimal character (0 to

9).

Represents a single hexadecimal character

(0 to 9 and A to F).

Represents a binary character (0x00 to

0xFF).

<sp>

space

Document Reference No.: FT_000078

FTDI Device EEPROM Programming Using a Vinculum VNC1L Application Note AN_105

Version 1.00

Clearance No.: FTDI# 59

1.2 Acronyms and Abbreviations

Terms

Description

VID

USB Vendor ID

PID

USB Product ID

EEPROM

Electrically Erasable Programmable ReadOnly Memory

UART

Universal Asynchronous Receiver/Transmitter

TTL

Voltage levels between 0V and 5V

Connection between two pins

ROM

Read Only Memory

FTD

Reflash file extension

Monitor

Command line interface which allows instructions to be given to the VNC1L and

responses to be returned.

LSB

Least Significant Byte is shown first when representing a multibyte number as a

sequence of bytes. For example, the number 0x55AAFF00 is stored or specified

as 4 bytes 0x00, 0xFF, 0xAA, and 0x55.

MSB

Most Significant Byte is shown first when representing a multibyte number as a

sequence of bytes. For example, the number 0x55AAFF00 is stored or specified

as 4 bytes 0x55, 0xAA, 0xFF, and 0x00.

FTxxx

Refers to the FT232R, FT245R, FT232B, FT245B and FT2232D/L/C chips.

DLL

Dynamically Linked Library

NDA

Nondisclosure Agreement

Table 1.1 Acronyms and Abbreviations

Document Reference No.: FT_000078

FTDI Device EEPROM Programming Using a Vinculum VNC1L Application Note AN_105

Version 1.00

Clearance No.: FTDI# 59

2 Project Setup

2.1 Hardware Setup

The hardware required in this application is an FTDI VDIP1 development module and an FTDI TTL232R

3V3 cable. The VDIP1 module contains a VNC1L. A PC is used to communicate with the VNC1L on the

VDIP1 via the TTL2323V3 cable. The cable connects to the USB port of a PC and converts USB

signalling to a serial UART interface (at TTL levels). The serial UART signals connect to the VDIP1 module

via a six way header. The pin out for the six way header is described in Table 2.1 and Figure 2.1. The

monitor port of the VDIP1 must be configured in UART mode by setting the jumper links J3 and J4 on the

VDIP1 module as shown in Figure 2.1.

Figure 2.1 Jumper Configuration and TTL-232R-3V3 Connection on VDIP1

TTL Cable Header

Pin Number

TTL Cable

Header Pin Name

VDIP1 Pin Name VDIP1 Pin Number

Pin 1 (Black)

GND

Pin 7

Pin 2 (Brown)

CTS#

ADBUS2 (RTS#) Pin 9

Pin 3 (Red)

VCC

Pin 1

Pin 4 (Orange)

TXD

ADBUS1 (RXD) Pin 8

Pin 5 (Yellow)

RXD

ADBUS0 (TXD) Pin 6

Pin 6 (Green)

RTS#

ADBUS3 (CTS#) Pin 10

Table 2.1 Pin Connections Between VDIP1 and TTL-232R-3V3

An alternative setup would be to attach a MCU or FPGA to the monitor port of the VDIP1 instead of the PC

and TTL232R3V3 cable.

To program the EEPROM of an FTxxx peripheral device, connect the USB socket of the FTxxx device into

the USB host port on the VDIP1 and then run the C application on the PC.

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