Firmware Update

Please remember it is always wise to make FAT disk backups periodically and especially before any update.

The latest firmware version is available at https://technical.swissmicros.com/{webdir}/firmware/

For quick update instructions, please follow Quick Update Guide.

The preferred firmware update method is by copying firmware file to calculator FAT disk. See Quick Update Guide for update procedure.

Firmware update from FAT disk is implemented in main firmware, so it could be unavailable if the main firmware is corrupted. In such a case, another method of update based on internal CPU flashing routine should be used. This method requires the calculator to be switched in so called 'Bootloader mode'. Once activated, the internal bootloader exposes standard DFU interface and can be programmed by any DFU programming software.

Following sections cover the use of two programs able to use this DFU interface:

GUI based dm_tool,
command line utility dfu-util.

Availability of the particular update method on mainstream operating systems outlines following table:

	FAT disk^[1]	dm_tool	dfu-util^[2]
Windows	✓	✓	✓
Linux i686	✓	✓	✓
Linux x86_64	✓	✓	✓
macOS	✓		✓

FAT disk^[1]

dm_tool

dfu-util^[2]

Windows

✓

Linux i686

✓

Linux x86_64

✓

macOS

✓

[1] FAT disk update was made available starting with DMCP version 3.5; therefore, a calculator with an earlier firmware version must be updated with one of the other methods.

[2] macOS users can get dfu-util via Homebrew.

Quick Update Guide (FAT disk update)

Prerequisites: {fwtmpl} - Complete {platform} firmware file e.g. {fwfile}

Steps

Activate USB disk from SETUP → File → Activate USB Disk or alternatively from DMCP System menu.
Connect USB cable from {platform} to PC/Mac computer.
Copy the {fwtmpl} file from the PC/Mac computer to root folder of calculator disk.
Eject (safely remove) the calculator disk from PC/Mac computer. Please, be patient this can take some time. Do not unplug the cable, even after the calculator’s USB disk has been successfully ejected by the OS, as USB power is required for the rest of the procedure.
If calculator does not detect OS ejection, shut down USB connection by pressing btn:[C]. New firmware file is detected and the calculator prompts for update. Confirm it immediately with btn:[ENTER] or cancel by pressing btn:[EXIT] to activate flashing process later using Flash firmware from FAT either from {platform} program SETUP → System or directly from DMCP System menu Enter System Menu.
Flash progress is displayed from 0 to 100%. An automatic verification pass follows.
Once finished, the calculator resets and should restart to updated {platform}.

Any State which hasn’t been saved to a Statefile prior to updating is lost.

Bootloader mode activation

Bootloader mode can be activated from main Setup menu: SETUP → System → Bootloader or by using RESET and PGM button.

The sequence of entering bootloader mode using RESET and PGM button is:

Press and hold PGM button
Press and release the RESET button
Release the PGM button

FW Update Using dm_tool

The latest version of dm_tool can be downloaded from the Tools web page.

Prerequisites for Windows

Install libusb driver as described here: http://technical.swissmicros.com/doc/libusb_install/libusb_install.html.

Prerequisites for Linux

USB device access rights: this configuration is optional.

Allow access to the DFU device for users in plugdev group by running as root:

cd /etc/udev/rules.d/
cat << OI > 49-stm32-dfuse.rules
# This is udev rules file (place in /etc/udev/rules.d)
# Makes STM32 DfuSe device accessible to the "plugdev" group

ACTION=="add", SUBSYSTEM=="usb", ATTRS{idVendor}=="0483", ATTRS{idProduct}=="df11", MODE="664", GROUP="plugdev"
OI
udevadm control --reload-rules

Then add users to plugdev group.

Launching dm_tool

Switch the calculator to bootloader mode: From menu or by RESET+PGM buttons (see Bootloader mode activation).
Connect the calculator to the PC: Be sure the libusb driver is installed if used in Windows (http://technical.swissmicros.com/doc/libusb_install/libusb_install.html).
Launch dm_tool: It can be launched by clicking on the exe file or from command line with firmware filename as argument.

If everything works well and the calculator was connected before launching dm_tool, then the message on the right side of [Program] button should show device number. If it shows "No DFU capable devices found (Click to refresh)" try to click at the message and it should display the ID of connected device after refresh and

Memory layout:
    0x8000000-0x80fffff:  size 1024kB = 512*2kB pages

in the text area.

If the message "No DFU capable devices found" still remains there something is wrong with libusb driver installation or connection to the calculator or the calculator isn’t in bootloader mode.

Finally press the [Program] button to flash new firmware. When the update is completed, you can close dm_tool, then Press [ON] to launch the new f/w.

FW Update Using dfu-util

macOS users can get dfu-util via Homebrew

Linux users (and possibly macOS users too) can avoid sudo use by setting appropriate user rights for DFU interface, see user rights configuration for Linux.

Note that dfu-util is command line utility launched from a terminal application and controlled by commands from the console. For new users, here are some tutorials on how to use command-line interfaces:

Proceed with the following steps:

Switch the calculator to bootloader mode

From menu or by RESET+PGM buttons (see Bootloader mode activation).

Connect the calculator to the computer

List information about connected DFU device using console command sudo dfu-util -l

Sample output of this command (from macOS)

$ sudo dfu-util -l
Password:
dfu-util 0.9

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

Deducing device DFU version from functional descriptor length
Found Runtime: [05ac:828b] ver=0149, devnum=6, cfg=1, intf=3, path="29-1.8.1.3", alt=0, name="UNKNOWN", serial="UNKNOWN"
Found DFU: [0483:df11] ver=2200, devnum=14, cfg=1, intf=0, path="20-4", alt=2, name="@OTP Memory /0x1FFF7000/01*0001Ke", serial="207B35994E34"
Found DFU: [0483:df11] ver=2200, devnum=14, cfg=1, intf=0, path="20-4", alt=1, name="@Option Bytes  /0x1FFF7800/01*040 e/0x1FFFF800/01*040 e", serial="207B35994E34"
Found DFU: [0483:df11] ver=2200, devnum=14, cfg=1, intf=0, path="20-4", alt=0, name="@Internal Flash  /0x08000000/512*0002Kg", serial="207B35994E34"

Where lines Found DFU: [0483:df11] indicate that calculator is correctly connected to the computer and switched into bootloader mode.

Prepare firmware file

Download the latest firmware file from https://technical.swissmicros.com/{webdir}/firmware/ and ensure it is accessible from current directory in console e.g. by ls -l {fwfile}.

Alternatively, download firmware file directly to current directory using command (edit to use correct firmware file name according to before-mentioned page)

curl -O https://technical.swissmicros.com/{webdir}/firmware/{fwfile}

Launch dfu-util command

Start flashing using command (edit to use correct firmware file name)

sudo dfu-util -D {fwfile} -d 0483:df11 -a "@Internal Flash  /0x08000000/512*0002Kg" -s 0x8000000

Please, be patient, as the operation takes some time (up to a few minutes).

Press RESET button after dfu-util finishes the flashing.

Example output of dfu-util

$ dfu-util -D {fwfile} -d 0483:df11 -a "@Internal Flash  /0x08000000/512*0002Kg" -s 0x8000000
dfu-util 0.9

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

dfu-util: Invalid DFU suffix signature
dfu-util: A valid DFU suffix will be required in a future dfu-util release!!!
Opening DFU capable USB device...
ID 0483:df11
Run-time device DFU version 011a
Claiming USB DFU Interface...
Setting Alternate Setting # 0 ...
Determining device status: state = dfuERROR, status = 10
dfuERROR, clearing status
Determining device status: state = dfuIDLE, status = 0
dfuIDLE, continuing
DFU mode device DFU version 011a
Device returned transfer size 2048
DfuSe interface name: "Internal Flash  "
Downloading to address = 0x08000000, size = 756288
Download	[=========================] 100%       756288 bytes
Download done.
File downloaded successfully

real	1m55.929s
user	0m0.044s
sys	0m0.048s