Application Note
AN_380
AN_380 FT900 Bootloader DFU
Usage
Version 1.0
Issue Date: 2015-10-13
This application note describes how to utilize the USB DFU feature found in
the FT900 bootloader to flash programs via USB.
Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and the
user agrees to defend, indemnify and hold FTDI harmless from any and all damages, claims, suits
or expense resulting from such use.
Future Technology Devices International Limited (FTDI)
Unit 1, 2 Seaward Place, Glasgow G41 1HH, United Kingdom
Tel.: +44 (0) 141 429 2777 Fax: + 44 (0) 141 429 2758
Web Site: http://ftdichip.com
Copyright © 2015 Future Technology Devices International Limited
Application Note
AN_380 FT900 Bootloader DFU Usage
Version 1.0
Document Reference No. FT_001197
Clearance No.: FTDI# 472
Table of Contents
1 Introduction .............................................................. 3
1.1 Overview .............................................................................3
1.2 Scope ..................................................................................3
2 Package Contents ...................................................... 4
2.1 Required Hardware .............................................................4
3 Building and installation of dfu-util ........................... 5
3.1 Installation of MinGW and MSYS .........................................5
3.2 Compiling libusb and dfu-util ..............................................5
3.2.1
Compiling libusb ............................................................................................. 5
3.2.2
Compiling dfu-util ........................................................................................... 5
4 FT900 Board Setup .................................................... 7
5 Flashing the Bootloader on to FT900 ......................... 8
6 dfu-util ...................................................................... 9
6.1 Windows Driver Signature Enforcement ............................ 10
6.2 WinUSB driver installation ................................................ 10
6.3 Downloading Firmware to the FT900 .................................14
6.4 DFU_application.bin .......................................................... 14
6.5 Preparation for DFU download .......................................... 16
6.5.1
Padding and Checksum Addition ..................................................................... 16
6.5.2
DFU Suffix ................................................................................................... 17
7 Customizing the Bootloader..................................... 18
8 Source Code ............................................................ 19
8.1 DFU_Application.bin (DFU_application.c) .......................... 19
8.2 DFU.h ................................................................................ 20
9 Tera Term Configuration .......................................... 22
10 Contact Information .............................................. 25
Appendix A................................................................... 26
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Document References ............................................................... 26
Acronyms and Abbreviations..................................................... 26
Appendix B – List of Tables & Figures .......................... 27
List of Figures ........................................................................... 27
List of Tables............................................................................. 27
Appendix C – Revision History ..................................... 28
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1 Introduction
USB Device Firmware Upgrade (DFU) is an official USB device class specification of the USB
Implementers Forum. It specifies a vendor and device independent way of updating the firmware
of a USB device. The idea is to have only one vendor-independent firmware update tool as part of
the operating system, which can then (given a particular firmware image) be downloaded into the
device. In addition to firmware download, it also specifies firmware upload, i.e. loading the
currently installed device firmware to the USB Host. The FT900 boot loader supports DFU based
flashing of programs and this application note describes the steps necessary to achieve it.
dfu-util.exe is a popular open source implementation of a host side implementation of the DFU 1.0
and DFU 1.1 specifications of the USB forum. Using dfu-util.exe users may download and upload
firmware to/from devices connected over USB.
1.1 Overview
In order to use DFU programming, the user has to have a DFU programmer utility. dfu-util.exe is
one such application and it is used in this application note. dfu-util.exe relies on libusb which is an
open source C library that gives applications easy access to the USB devices in the system. Libusb
in turn relies on WinUSB, which is a generic driver for USB devices that was developed
concurrently with the Windows Driver Frameworks (WDF) for Windows XP with SP2. The WinUSB
architecture consists of a kernel-mode driver (WinUSB.sys) and a user-mode dynamic link library
(WinUSB.dll) that exposes WinUSB functions.
This note describes how to build dfu-util.exe and libusb.dll and install the WinUSB DLL and device
drivers. On the device side, it also describes how to prepare a program for DFU download and
customize the bootloader to match the user’s USB device identification.
dfu-util.exe and dfu-util are used interchangeably in this document. C:\ is used as the example
pathname in cmd.exe prompts. The software that is used in this application note is packaged in
DFU_util_package.zip and is described in 2 Package Contents.
1.2 Scope
This application note covers DFU programming using dfu-util.exe built for a Windows system and
does not cover Linux or MAC versions of dfu-util.exe
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2 Package Contents
The package may be obtained from this link - DFU_util_package.zip. It contains the items listed
below:
Item
Description
1
dfu-util.exe
Windows DFU binary which is used for listing DFU devices connected
to the system and flashing binary to device when the device is in
DFU-mode
2
DFU_application.bin
First demo application executable
3
FT900ProgGUI.jar*
Programming utility which is used to prepare firmware for DFU
download
4
FT900 WinUSB
Driver Package
WinUSB device-driver software for FT900 DFU device
5
MinGW-5.1.3.exe
Executable to install MinGW libraries required for dfu-util and libusb
compilation
6
MSYS-1.0.10.exe
Executable to install MSYS. Required by dfu-util.exe and libusb-1.0.dll
7
libusb-1.0.dll
USB library file to support WinUSB driver
8
teraterm-4.86.exe
An open source terminal emulator software used for serial
communications
Table 1 Package Contents
*Refer to the Toolchain Installation executable for the programming utility file. This file is available
as part of .\FTDI\FT90x Toolchain\Toolchain\programmer\dist\
2.1 Required Hardware
Item
Description
1
MM900EVxA
FT900 MCU Evaluation Module, x=1,2, or 3
2
UMFTPD2A
FT900 Programmer Board – uses One-wire programming to recover
the MM900EVxA if the device corrupts and the DFU becomes
unserviceable.
3
Micro USB Cables
For attaching MM900EVxA and UMFTPD2A to PC
4
USB-Serial Cable
For serial communication between MM900EVxA and PC such as TTL232R-3V3.
Table 2 Hardware Required
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3 Building and installation of dfu-util
dfu-util.exe (Release 0.8) and libusb-1.0.dll (Release 1.0.19) are pre-built and provided in binary
form in the package. The following sections show how to build them from source.
1. Extract the contents of the “DFU_util_package.zip” package.
2. Copy folders dfu-util-0.8 and libusb-1.0.19 to the desired location. For simplicity, this
application note assumes the folders are copied to the C: directory, i.e. “C:\DFU”. It is
important that the two folders are at the same folder level, for example, C:\DFU\dfu-util0.8 and C:\DFU\libusb-1.0.19.
Note
Windows platform need MinGW and MSYS for the
compilation of dfu-util and libusb.
3.1 Installation of MinGW and MSYS
1. From the package run MinGW-5.1.3.exe. MinGW-5.1.3.exe is an installer which connects to
the internet to download and install the MinGW toolchain.
2. From the package run MSYS-1.0.10.exe which guides the user through the installation
procedure of MSYS
3. The above installations require an Internet connection.
3.2 Compiling libusb and dfu-util
1. Open a MinGW terminal:
a. Start -> All Programs ->MinGW -> MSYS -> msys
b. msys provides a Unix like shell environment suitable for dfu-util and libusb
compilation.
2. Switch to the folder containing dfu-util-0.8 and libusb-1.0.19 and run the following
commands In the supplied example, it is C:\DFU
3.2.1
Compiling libusb
cd libusb-1.0.19
./configure --prefix=$HOME
# WINVER workaround needed for 1.0.19 only
# MKDIR_P setting should not really be needed...
make CFLAGS="-DWINVER=0x0501" MKDIR_P="mkdir -p"
make install
cd ..
3.2.2
Compiling dfu-util
cd dfu-util-0.8
./configure USB_CFLAGS="-I$HOME/include/libusb-1.0" \
USB_LIBS="-L $HOME/lib -lusb-1.0" PKG_CONFIG=true
make
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make install
cd ..
make LDFLAGS=-static
The built executables (and DLL) will now be under /usr/local/bin.
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4 FT900 Board Setup
1. Connect the MM900EVxA evaluation module and the UMFTPD2A programmer board to the
PC via USB.
Figure 1 FT900 Board Setup
2. Connect the UMFTPD2A module to the MM900EVxA via a ribbon cable. Attach one end of
the ribbon cable to CN3 (connector number 3) on UMFTPD2A to CN7 (connector number 7)
on MM900EVxA. This module acts as the programmer for FT900.
3. Connect the FT900 UART port to the PC via a TTL UART cable. Minimum connections are
CN3 pin 2 (GND), pin 4 (UART0_TXD) and pin 6 (UART0_RXD). The sample application
(DFU_application.bin) uses serial communication to display information on a terminal (such
as Tera Term).
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5 Flashing the Bootloader on to FT900
The bootloader is flashed using the FT900 Programmer. By default, the bootloader enumerates
with idVendor=0x0403, idProduct=0x0FDE and bcdDevice is set to 2300. These values may be
customized in the Bootloader tab of FT900ProgGUI.jar to match the end product requirement. See
Section 7 Customizing the Bootloader for more details.
1.
2.
3.
4.
5.
6.
Run the FT900ProgGUI.jar
Switch to the Bootloader tab.
Update the idVendor, idProduct and bcdDevice fields. Leave the ‘Timeout’ field as 250ms.
Press the “Start” button to initiate flashing the bootoloader
In this application note, the bootloader is flashed with the default values.
Once programming is complete, reset the MM900EVxA module.
Figure 2 Flashing bootloader to FT900
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6 dfu-util
After flashing the bootloader and resetting the MM900EVxA module, the bootloader detects that
there is no valid application and enters DFU mode. In DFU mode, the bootloader initializes the USB
device interface and enumerates itself as a USB DFU device. dfu-util may be used to confirm that
the bootloader is in DFU mode.
1. Run the following command. The path C:\ is for example and may be different in the user’s
system.
C:\> dfu-util.exe -l
Figure 3 List DFU capable devices
The default idVendor and idProduct reported by the bootloader during USB enumeration are
0x0403 and 0x0FDE respectively. The output listing from dfu-util indicates “Cannot open DFU
device 0403:0fde” as shown in Figure 3. This confirms that the bootloader is indeed in DFU mode.
Other DFU capable devices may also be listed by dfu-util and the user shall look for the correct
Vendor and Device IDs.
The “error” message from dfu-util confirms that the bootloader is waiting in DFU mode. The error
is reported because WinUSB is required by libusb-1.0.dll to “open” the USB device.
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6.1 Windows Driver Signature Enforcement
On 64-bit Windows 7 and on Windows 8.x machines, driver signature check enforcement is
enabled by default. Any unsigned driver (without a valid certificate) installations are rejected by
these operating systems. Windows signature check enforcement has to be bypassed to install
WinUSB. Following is a helpful link that shows how driver enforcement may be bypassed:
http://www.ftdichip.com/Support/Documents/TechnicalNotes/TN_129_Driver%20Release%20Signi
ng.pdf
6.2 WinUSB driver installation
Open Device Manager from the Control Panel. Look for “Unknown device”. Right click on the
“Unknown device” and select Properties. Figure 4 and Figure 5 illustrate these.
Figure 4 Device Manager and Unknown device
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Figure 5 Right-click and select Properties
Figure 6 shows how to locate the FT900 USB Device. On the “Properties” page, select the “Details”
tab
and
select
“Hardware
Ids”
property.
The
“Value”
display
should
show
USB\VID_0403&PID_0FDE&REV_2300. If the value does not match, then select another
“Unknown device” to check the “Hardware Ids”.
Figure 6 Locating FT900 USB Device
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Once the “Unknown device” is confirmed to be an FT900 USB device, switch back to the device
manager and right-click on the chosen “Unknown devices” and select “Update Driver Software”.
Refer to Figure 5. This will bring up the next screen. Select “Browse my computer for driver
software”.
Figure 7 – Installing WinUSB
Within the DFU_util_package, browse for the WinUSB installation files. The relative path is at
“.\FT900 WinUSB Driver Package\DriverInstallation\installer”. After navigating to the correct
folder, click on next to begin the installation. During installation, Windows Security will warn that it
can’t verify the publisher of the software. Choose “Install this driver software anyway” to continue
the installation.
Figure 8 – Windows Security warning
Once driver installation is complete, the following display is shown:
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Figure 9 – Successful Installation of WinUSB
Switch back to the command prompt box used to run dfu-util.exe (Figure 3 List DFU capable
devices) or open a new command prompt box (cmd.exe). Repeat the listing of DFU devices
command to confirm that the FT900 USB DFU device is now accessible by dfu-util.
C:\> dfu-util.exe –l
Figure 10 Confirm FT900 USB DFU device
This time, the listing will display all the DFU capable devices that are found (red circle in Figure 10
Confirm FT900 USB DFU device).
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6.3 Downloading Firmware to the FT900
When a FT900 is first flashed with the bootloader executable, it does not contain any application
program. The bootloader detects that no valid application is present and enters DFU mode waiting
for firmware to be downloaded.
Firmware is downloaded using the following command:
C:/> dfu-util.exe -d 0403:0fde -vRD DFU_application.bin
Note that any other application .bin file can also be programmed, but refer to Section 6.5
Preparation for DFU download for additional requirements.
Figure 11 Downloading firmware on FT900
Figure 11 Downloading firmware on FT900, shows the download command execution and upon
download completion, dfu-util reports 100% download completion.
Though dfu-util reports “Resetting USB to switch back to runtime mode”, no USB reset is issued
and FT900 remains in DFU mode and a manual reset has to be performed (press reset button or
remove and insert the USB cable to the FT900). After reset, the bootloader executes the new
firmware.
6.4 DFU_application.bin
DFU_application.bin is a simple demo application that shows how a user application may be
upgraded via DFU. In order to enter DFU mode, an application is required to call into a function in
the bootloader and DFU_application.bin shows how this is done.
At application startup, DFU_application.bin displays a message as shown in Figure 12 Startup
message from DFU_application.bin. It waits for the user to press the ENTER key. Once the ENTER
key is pressed, the application jumps into DFU mode and stops responding to further keystrokes
from the terminal. While the application executes, dfu-util is not able to find the FT900 DFU device
because the DFU mode is inactive. However, after the ENTER key is pressed, the application enters
DFU mode and dfu-util is able to find the FT900 DFU device again.
See Section 9 Tera Term Configuration for terminal setup.
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Figure 12 Startup message from DFU_application.bin
Once the ENTER key is pressed, the application displays “Switching to DFU” and enters DFU mode.
This is shown in Figure 13 Switching from application mode to DFU mode.
Figure 13 Switching from application mode to DFU mode
After switching to DFU mode, dfu-util is able to find and list the device. This is shown in Figure 14
Confirming DFU mode switch.
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Note: The dfu-util listing command has to be issued a few times before the
device is successfully reported as “Found”. The delay is caused by USB Bus
enumeration and/or re-enumeration requested by dfu-util.
Figure 14 Confirming DFU mode switch
Now that the device is once again in DFU-Mode, the firmware may be upgraded via DFU.
6.5 Preparation for DFU download
When an application is compiled and linked, the toolchain produces the executable and the
corresponding binary file. This file is not ready for DFU download and needs to be prepared first.
The DFU_application.bin used in the previous section had already been prepared. The next
sections describe the preparation step.
6.5.1
Padding and Checksum Addition
Before the firmware is upgraded via DFU, it needs to be appropriately prepared. The application
build outputs an executable which is automatically converted, in the toolchain, to a binary file
suitable for firmware download via the one-wire programmer.
However, for DFU download, the binary file has to be 252KB in size. The preparation step pads the
binary file to 252KB in size. Additionally, the signature and checksum are inserted into the binary
file. The padding and checksum are required to ensure that the bootloader is able to successfully
verify that a valid firmware image exists in flash memory.
The padding process pads the binary file to a size of 252KB. The signature and checksum takes up
4 bytes and therefore, the input binary file shall not exceed 252KB–4bytes, i.e. 258,044
bytes.
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6.5.2
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DFU Suffix
The USB DFU protocol requires that the binary file contain a DFU suffix to identify the file and its
corresponding target USB device. The suffix is described in the USB DFU specification document.
The DFU Suffix contains parameters such as the idVendor, idProduct, bcdDevice and bcdDFU.
When dfu-util downloads the firmware, it matches these parameters against the USB Device
reported parameters. If there is a mismatch, then dfu-util may not proceed with the download. In
the current version as of this writing, dfu-util is at version 0.8 and outputs a warning on a
mismatch but proceeds with the download nevertheless. In a future version, the DFU suffix check
may be enforced.
Therefore, by using the “DFU Preparation” tab, idVendor, idProduct and bcdDevice settings may be
customized to match the values programmed in the bootloader (refer to Section “Downloading
Firmware to the FT900”). bcdDfu shall always be set as 0100.
Alternatively, the idVendor, idProduct and bcdDevice settings may be left as “Default”. The default
setting is a wildcard setting of idVendor=0xFFFF, idProduct=0xFFFF. These values inform dfu-util
to ignore the DFU suffix check.
The next step shows the “DFU Preparation” tab and the “Customized” settings. Fill the input binary
file in the “Binary file” entry and the required output file in the “Output file” entry. Click “Start” to
begin the preparation and at the end, the “Output file” is produced. The output file may then be
used for DFU download.
Figure 15 DFU Preparation
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7 Customizing the Bootloader
The default bootloader that ships with MM900EVxA is programmed to enumerate as a USB DFU
device with idVendor=0x0403 and idProduct=0x0FDE. These values may be modified to match the
customer’s requirements and may be done via the FT900 Programming Utility (FT900ProgGUI.jar).
1. Launch the FT900ProgGUI.jar java executable. Refer to section 5 “Flashing the Bootloader
on to FT900”.
2. Select the Bootloader tab
3. Enter the required values in the idVendor, idProduct and bcdDevice. Leave the timeout as
250ms.
4. Press the “Start” button to program the new bootloader into the FT900 device. This
programming takes place via the One-wire programmer
Note
When the idVendor and idProduct are customized, the bootloader DFU will enumerate with
these new values. To support the customized DFU, a corresponding INF file is required so
that WinUSB driver is installed for this “new” DFU capable device. The WinUSB installation
INF file may be edited with the customized values, i.e. replace the idVendor and idProduct
values in the INF file and repeat the steps in 6.2 WinUSB driver installation to install the new
DFU device.
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8 Source Code
8.1 DFU_Application.bin (DFU_application.c)
Sample source code takes a user input and enters into DFU mode. Look for the GO_DFU() macro
in the uartISR() function below:
/*
* DFU_application.c
*
* Created on: Apr 30, 2015
*
*/
/*
************************************************************************/
#include<uart_command.h>
#include<DFU.h>
/** CONSTANTS ................................ */
#define UART0_TXD
#define UART0_RXD
INCLUDES
(48)
(49)
/* FUNCTION DEFINITIONS .......................... */
void uart_init(void);
void myputc(void* p, char c);
void displayBanner(void);
/** CODE .......................................... */
/** Program Entry */
main()
{
uart_init();
displayBanner();
tfp_printf("\033[8;10H");
tfp_printf("Waiting");
while(1)
{
tfp_printf("\033[8;17H");
tfp_printf("
");
tfp_printf("\033[8;17H");
tfp_printf(".");
delayms(500);
tfp_printf(".");
delayms(500);
tfp_printf(".");
delayms(500);
}
}
/** displays banner to screen through uart*/
static void displayBanner()
{
tfp_printf("\033[2J");
tfp_printf("\033[4;10H");
tfp_printf("This is NEW FIRMWARE\r\n");
tfp_printf(" Hit Enter to enter DFU-mode");
tfp_printf((unsigned char *)"\n\r***************************************\n\r");
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}
/**uart interrupt handler*/
void uartISR()
{
// Check type & clear interrupt
if (uart_is_interrupted(UART0, uart_interrupt_rx))
{
tfp_printf("\r\nSwitching to DFU");
GO_DFU(0,0,0); // this is the step to switch in the bootloader DFU
}
}
/** uart initialization*/
void uart_init()
{
// Initialize local variables
uint16_t
divisor
= 0;
uint8_t
prescaler
= 0;
// Initialize UART0
sys_enable(sys_device_uart0);
gpio_function(UART0_TXD, pad_uart0_txd);
// UART0_TXD/GPIO48
gpio_function(UART0_RXD, pad_uart0_rxd);
// UART0_RXD/GPIO49
uart_open(UART0,
/* Device */
1,
/* Prescaler = 1 */
UART_DIVIDER_115200_BAUD, /* Divider = 1302 */
uart_data_bits_8,
/* No. Data Bits */
uart_parity_none,
/* Parity */
uart_stop_bits_1);
/* No. Stop Bits */
// Enable received interrupt for UART0
uart_enable_interrupt(UART0, uart_interrupt_rx);
uart_enable_interrupt(UART0, uart_interrupt_tx);
uart_enable_interrupts_globally(UART0);
interrupt_enable_globally();
init_printf(UART0,myputc);
// Attach ISR function
interrupt_attach(interrupt_uart0, (uint8_t) interrupt_uart0, uartISR);
}
void myputc(void* p, char c)
{
uart_write((ft900_uart_regs_t*)p, (uint8_t)c);
}
/* end */
8.2 DFU.h
/*
* DFU.h
*
* Created on: Apr 30, 2015
*
*/
#ifndef __FT900_DFU_H__
#define __FT900_DFU_H__
#ifdef __cplusplus
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extern "C" {
#endif /* __cplusplus */
/* TYPES
***************************************************************************/
typedef void (*__dfumain_t)(unsigned int, unsigned int) __attribute__((noreturn));
/* MACROS
**************************************************************************/
#define _GO_DFU(ID,BCD) ((__dfumain_t)0x3fff4)((ID),(BCD))
#define _concat(a,b) ((a) << 16 | (0xFFFFUL & (b)))
/** @brief macro to Jump into DFU mode
* @param v Vendor ID
* @param p Product ID
* @param b BCD devoce
*/
#define GO_DFU(v,p,b) do {\
_GO_DFU((unsigned int) _concat((v),(p)), (unsigned
int)_concat(0,(b))); \
} while(0)
#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */
#endif
//__FT900_DFU_H__
/* end */
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9 Tera Term Configuration
Tera Term is used to view UART data sent from the DFU_Application, or any other application
which uses UART0 to send and/or receive data.
Figure 16 FT900 UART Connections
1. Install Tera Term from the package
2. Attach the USB-Serial cable to the FT900 UART pins (GND/TXD/RXD). Do not yet attach
the USB-Serial cable to the PC.
3. Open Device Manager and then insert the USB-UART cable into a USB port on the PC.
4. Under “Ports (COM & LPT), verify the COM port assigned to the USB-Serial cable.
Figure 17 Device Manager – Ports (COM & LPT)
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Figure 18 USB Serial Port (COM25)
In this case, after the USB-Serial cable was inserted, a new “USB Serial Port (COM25)” entry
appeared.
Launch Tera Term.exe and select “Setup” from the menu and choose “Serial port…”.
Figure 19 Configure Serial Port in Tera Term
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Document Reference No. FT_001197
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Select the port assigned to the USB Serial cable and set the baud-rate to 19200 for communication
with DFU_application.bin and press OK.
Figure 20 Serial port setup
Tera Term is configured for communication with DFU_application.bin so the text in Section 6.4
DFU_application.bin can be seen.
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10 Contact Information
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Please visit the Sales Network page of the FTDI Web site for the contact details of our distributor(s) and sales
representative(s) in your country.
System and equipment manufacturers and designers are responsible to ensure that their systems, and any Future Technology
Devices International Ltd (FTDI) devices incorporated in their systems, meet all applicable safety, regulatory and system-level
performance requirements. All application-related information in this document (including application descriptions, suggested
FTDI devices and other materials) is provided for reference only. While FTDI has taken care to assure it is accurate, this
information is subject to customer confirmation, and FTDI disclaims all liability for system designs and for any applications
assistance provided by FTDI. Use of FTDI devices in life support and/or safety applications is entirely at the user’s risk, and the
user agrees to defend, indemnify and hold harmless FTDI from any and all damages, claims, suits or expense resulting from
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Document Reference No. FT_001197
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Appendix A
Document References
1. Universal Serial Bus, Device Class Specification for Device Firmware Upgrade, Version 1.1,
Aug 5, 2004
2. http://dfu-util.sourceforge.net/build.html
3. http://www.mingw.org/wiki/howto_install_the_mingw_gcc_compiler_suite
4. http://www.ftdichip.com/Products/ICs/FT90x.html
5. http://www.ftdichip.com/Support/FTDocuments.htm
Acronyms and Abbreviations
Terms
DFU
MinGW
MSYS
USB
USB-IF
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Description
Device Firmware Update
Minimalist GNU for Windows, formerly mingw32
MSYS is a collection of GNU utilities such as bash, make, gawk and grep
to allow building of applications and programs which depend on
traditionally UNIX tools
Universal Serial Bus
USB Implementers Forum
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AN_380 FT900 Bootloader DFU Usage
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Document Reference No. FT_001197
Clearance No.: FTDI# 472
Appendix B – List of Tables & Figures
List of Figures
Figure 1 FT900 Board Setup ................................................................................................. 7
Figure 2 Flashing bootloader to FT900 ................................................................................... 8
Figure 3 List DFU capable devices ......................................................................................... 9
Figure 4 Device Manager and Unknown device ...................................................................... 10
Figure 5 Right-click and select Properties ............................................................................. 11
Figure 6 Locating FT900 USB Device.................................................................................... 11
Figure 7 – Installing WinUSB .............................................................................................. 12
Figure 8 – Windows Security warning .................................................................................. 12
Figure 9 – Successful Installation of WinUSB ........................................................................ 13
Figure 10 Confirm FT900 USB DFU device ............................................................................ 13
Figure 11 Downloading firmware on FT900 ........................................................................... 14
Figure 12 Startup message from DFU_application.bin ............................................................ 15
Figure 13 Switching from application mode to DFU mode ....................................................... 15
Figure 14 Confirming DFU mode switch ................................................................................ 16
Figure 16 DFU Preparation ................................................................................................. 17
Figure 17 FT900 UART Connections ..................................................................................... 22
Figure 18 Device Manager – Ports (COM & LPT) .................................................................... 22
Figure 19 USB Serial Port (COM25) ..................................................................................... 23
Figure 20 Configure Serial Port in Tera Term ........................................................................ 23
Figure 21 Serial port setup ................................................................................................. 24
List of Tables
Table 1 Package Contents .................................................................................................... 4
Table 2 Hardware Required .................................................................................................. 4
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Appendix C – Revision History
Document Title:
AN_380 FT900 Bootloader DFU Usage
Document Reference No.:
FT_001197
Clearance No.:
FTDI# 472
Product Page:
http://www.ftdichip.com/FTProducts.htm
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Send Feedback
Revision
1.0
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Initial Release
Date
2015-10-13
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