CW312T-RP2350¶

This board supports the Raspberry Pi RP2350 microcontroller. It especially lets you experiment with features such as power analysis or fault injection, including testing the glitch detectors.

Specifications¶

Feature	Notes/Range
Target Device	RP2350
Target Architecture	Arm & RISC-V
Vcc	1.0V (on-board LDO)
Programming	Bootloader
Hardware Crypto	No
Availability	Standalone
Status	Released
Shunt	TBD

Power Supply¶

The RP2350 has an internal regulator. This regulator is not used in the board, instead power for the core is supplied by an external LDO on the board.

Programming¶

The USB bootloader can be used by enabling the 12 MHz clock source. To program, do the following:

Run scope.default_setup()
Set scope.clock.clkgen_freq = 12E6
Set PDIC low and time.sleep(0.5)
Set NRST low and time.sleep(0.5)
Set NRST to high-z (scope.io.nrst = None) and time.sleep(0.5)
Set PDIC to high-z

Following this, a removable drive should appear, after which your generated UF2 file can be copied over. Your RP2350 will reboot and run your firmware.

The drive can be found in Python via the following code, requiring the wmi package on Windows:

def get_windows_drive_letter(self):
    import wmi
    letter = None
    c = wmi.WMI()
    for drive in c.Win32_LogicalDisk():
        # uncomment to print info of all connected drives
        #print(str(drive))
        #print(str(drive.Caption) + str(drive.VolumeName) + str(drive.DriveType))
        if drive.VolumeName == "RP2350":
            letter = drive.Caption
    return letter

def linux_get_rpi_path(self):
    import subprocess
    result = subprocess.run(['blkid', '-l', '-o', 'device', '-t', 
                            'LABEL=RP2350', '-c', '/dev/null'],
                            capture_output=True)
    mnt = result.stdout.decode().strip()
    result = subprocess.run(['findmnt', mnt, '-no', 'TARGET'], capture_output=True)
    return result.stdout.decode().strip()

Troubleshooting¶

Drive appears, then disappears before programming¶

Try increasing the time.sleep() delays

Schematic¶

The schematic is available here.

Board Layout¶

See GIT Repo for gerber files.