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Cw308 stm32f.jpg
Target Device ST STM32F
Target Architecture Cortex M0,M3,M4
Hardware Crypto Possible
Purchase Hardware

Webstore, F0

Webstore, F1

Webstore, F3

Webstore, F4

Webstore PCB
Design Files

GITHub Link

Supported Apps Simple Serial Enc/Auth
Programmer ST-LINK/V2
Status Released

Supported Devices

The STM32F board supports several STM32F devices in the TQFP-64 package. Various solder jumpers need to bet set to either the "A" or "B" position to select appropriate VCC supply for the different series. The following table summarizes examples of suitable devices:

STM32F Series Package Device Hardware AES Tested Jumper Flash SRAM NAE P/N
F0 TQFP-64 STM32F071RBT6 No Yes B 128KB 16KB NAE-CW308T-STM32F0
F1 TQFP-64 STM32F100RBT6B No Yes B 128KB 8KB NAE-CW308T-STM32F1
F2 TQFP-64 STM32F215RET6 Yes Yes A 512KB 132KB NAE-CW308T-STM32F2HWC
F3 TQFP-64 STM32F303RCT7 No Yes B 256KB 40KB NAE-CW308T-STM32F3
F4 TQFP-64 STM32F415RGT6 Yes Yes A 1MB 192KB NAE-CW308T-STM32F4HWC
F4 TQFP-64 STM32F405RGT6 No Yes A 1MB 192KB NAE-CW308T-STM32F4

VCC-Int Supply

Several devices (F2, F4) have internal core voltage regulators. By default the CW308 board attempts to provide power for these pins, but the voltage may not be high enough to cause the internal regulator to disable itself. In this case you can use the VADJ regulator to ensure the internal regulator is disabled. See Targets with Internal Regulators for details.

Pin-outs across TQFP Devices

The following shows differences in pinouts between three groups of devices. The left-most is the STM32F051RB, which uses the same 3.3V VCORE as the STM32F1/F3. It has fewer VCC pins, so the I/O occupying that are VCC/GND pins on the STM32F1 (such as PF6/PF7) are tied to GND/VCC. The right-most part is the pinout of the STM32F2/F4. It has an internal regulator, where the VCAP pins are the output of this regulator (and input to the internal core logic).

Power diffstm32.png

Note for the devices with a 3.3V VCORE, you should not mount decoupling capacitors C5/C6/C7/C8. You will still get some leakage with those capacitors mounted, but a stronger signal is present without them.

Hardware AES

The STM32F21x, and STM32F41x/43x have hardware crypto modules (AES, DES, TDES) along with hardware hash (SHA1, MD5).

Programming Connection

ChipWhisperer Programmer via Bootloader

See further down this wiki page for details.

JTAG Programmer

The 20-pin JTAG port (J6 on CW308 Board) can be used with the ST-LINK/V2 which is a low-cost JTAG programmer.

It is also possible to use other JTAG programmers such as OpenOCD. The following command worked with an Olimex OpenOCD programmer and their OpenOCD for Windows software:

  -f path/to/board/files/cw308.cfg 
  -c init 
  -c targets 
  -c "halt" 
  -c "flash write_image erase path/to/firmware.hex"       
  -c "verify_image path/to/firmware.hex"        
  -c "reset run" 
  -c shutdown

where the contents of cw308.cfg are

source [find interface/olimex-arm-usb-ocd-h.cfg]
source [find target/stm32f4x.cfg]
reset_config srst_only

Example Projects

SimpleSerial builds for each of the STM32Fx Devices. Each device is a separate HAL. These HAL modules have been copied from ST's HAL (not the CUBE) and greatly reduced in size by deleting unused files (such as headers for unused devices), and combining several C-source files into a single low-level C-file.

Building ST Example on Command Line

The regular firmware build process works with the STM32 devices. For example, to build `simpleserial-aes`, navigate to the folder `chipwhisperer\hardware\victims\firmware\simpleserial-aes` and run the following command on the command line:


If all goes well, this command will finish by printing the output file size and the platform:


Programming via ChipWhisperer Bootloader

The STM32Fx devices have a built-in bootloader, and the ChipWhisperer software as of 3.5.2 includes support for this bootloader.

Important notes before we begin:

  • You MUST setup a clock and the serial lines for the chip. This is easily done by selecting a start-up script such as the "AES SimpleSerial on XMEGA" startup script.
  • On the STM32F1, you MUST adjust the clock frequency to by 8MHz. The bootloader does not work with our usual 7.37 MHz clock frequency.

To access the bootloader you can perform these steps:

  1. Select the
    Arm programmer.png
  2. Mount a jumper between the H1/H2 pins on the UFO board:
  3. Reset the ARM device either by pressing the reset button (newer UFO boards only), or by toggling power:
    Arm togglepower.png
  4. Select the hex-file and press the "Program/Verify" button.
  5. The device should program, it may take a moment to fully program/verify on larger devices:
    Arm programmed.png
  6. Remove the jumper between the H1/H2 pins.
  7. Reset the ARM device either by pressing the reset button (newer UFO boards only), or by toggling power:
    Arm togglepower.png

If you get verify errors, it's possible the shunt resistor is causing power to dip too low. This can be solved by mounting a jumper between the "SH-" and "SH+" pins at J16 (to the left of the SMA connector) on the UFO board. Retry programming with the jumper mounted.

Running ST Example with ST-Link

If instead of using the bootloader, you want to use a ST-Link you can instead plug your programmer into the 20 pin JTAG connector (J6 on the UFO board):


Then, the details of this step will depend on your programmer. If you're using an ST-Link programmer, open the ST-Link utility and connect to the device:


Load your `.hex` file and program the device with the Program and Verify button:


After this, you're ready to go - you can use the ChipWhisperer terminal to talk to your target. You might need to reset the target before you do anything else.

Building and Debugging via ST's System Workbench

It's also possible to work on the example projects using ST's System Workbench IDE. This IDE also supports debugging, which is helpful for working out all the kinks in your firmware.

To build the ChipWhisperer examples in System Workbench:

1. Create a Makefile Project with Existing Code and enter the firmware's location in Existing Code Location:


2. Link the external files into the project. To do this, under File > Import, select File System. In the `chipwhisperer\hardware\victims\firmware` directory, select all of the relevant files and folders (Makefile in base folder, Makefile in HAL folder, STM32Fx HAL folder). Ensure that make links to these files (instead of directly importing them):


3. Set up the build command. In File > Properties, go to C/C++ Build and deselect 'Use default build command'. Enter the command you would normally enter on the command line:


4. Build the project and confirm that the build works from the output in the IDE console.

Then, if you want to set up debugging:

1. Find ST's list of debugging targets (check around `C:\STMicro\Ac6\SystemWorkbench\plugins\fr.ac6.mcu.debug_1.12.1.201703061527\resources\openocd\scripts\board`). Make a config file for your target. This file's contents should be something like (adjust for your board):

# This is an CW308T_STM32F0 board with a single STM32F071R8Tx chip.
# Generated by System Workbench for STM32

source [find ../interface/stlink-v2-1.cfg]

transport select "hla_swd"


source [find ../target/stm32f0x_stlink.cfg]

# use hardware reset, connect under reset
reset_config srst_only srst_nogate

2. In Run > Debug Configurations, make a new Ac6 STM32 Debugging configuration. Under the 'Debugger' tab, select Use local script and select your custom script:


3. Enter debugging mode.

Caveat: the I/O register map in the debugger appears to use the last known device (ie: if you debugged an STM32F4 project before your Makefile project, it sticks with F4's registers). Check that the registers' addresses are correct before you trust them!


The following variants are possible, see the table above for SRAM/FLASH/HW-Crypto status:

Variant U1 R3 (VCC-Shunt) R4 (Clock)
F0 STM32F071RBT6  33-ohm 120-ohm
F1 STM32F100RBT6 22-ohm 51-ohm
F3 STM32F303RCT7 12-ohm 51-ohm
F4 STM32F405RGT6 10-ohm 51-ohm

CW308T STM32F 02.png