After reseting the firmware the USB device is not found anymore

#1

My ChipWhisperer-Lite stoped working so I tried to reset its firmware by shorting JP2 while the Lite was on. After shorting the pins, I unplugged and replugged the USB connector and now ,I can see D2 and D9 diodes lit dimly everytime I connect it to my PC.

However the USB is not recognized anymore. When I use the next commands:

import chipwhisperer as cw
scope = cw.scope()

I get the error:

OSError Traceback (most recent call last)
in
1 import chipwhisperer as cw
----> 2 scope = cw.scope()

c:\users\asizu\chipwh~1\git\home\portable\chipwhisperer\software\chipwhisperer_init_.py in scope(scope_type, sn)
226 from chipwhisperer.common.utils.util import get_cw_type
227 if scope_type is None:
–> 228 scope_type = get_cw_type(sn)
229 scope = scope_type()
230 try:

c:\users\asizu\chipwh~1\git\home\portable\chipwhisperer\software\chipwhisperer\common\utils\util.py in get_cw_type(sn)
501 name = “”
502 if len(possible_sn) == 0:
–> 503 raise OSError(“USB Device not found. Did you connect it first?”)
504
505 if (len(possible_sn) > 1):

OSError: USB Device not found. Did you connect it first?

How can I solve this? I tried to uninstall from the device manager and the right drivers for windows are installed also. I have no clue of what is happening.

#2

Hi,

You’ll need to program new firmware onto your Lite before you can connect to it again.

Try the following code:

import chipwhisperer as cw
def program_sam_firmware(hardware_type=None):
    at91_ports = cw.get_at91_ports()
    if len(at91_ports) == 0:
        raise OSError("Could not find bootloader serial port, please see https://chipwhisperer.readthedocs.io/en/latest/firmware.html")
    if len(at91_ports) > 1:
        raise OSError("Found multiple bootloaders, please specify com port. See https://chipwhisperer.readthedocs.io/en/latest/firmware.html")

    serial_port = at91_ports[0]
    print("Found {}".format(serial_port))
    prog = cw.SAMFWLoader(None)
    prog.program(serial_port, hardware_type=hardware_type)

program_sam_firmware("cwlite")

Alex

#3

Hi, thanks for the answer. I tried to run your code, but I got the next error:

AttributeError Traceback (most recent call last)
in
12 prog.program(serial_port, hardware_type=hardware_type)
13
—> 14 program_sam_firmware(“cwlite”)

in program_sam_firmware(hardware_type)
1 import chipwhisperer as cw
2 def program_sam_firmware(hardware_type=None):
----> 3 at91_ports = cw.get_at91_ports()
4 if len(at91_ports) == 0:
5 raise OSError(“Could not find bootloader serial port, please see https://chipwhisperer.readthedocs.io/en/latest/firmware.html”)

AttributeError: module ‘chipwhisperer’ has no attribute ‘get_at91_ports’

#4

Whoops, sorry, that function is on an upcoming update. Try this:

def get_at91_ports():
    from serial.tools import list_ports

    at91_ports = [port.device for port in list_ports.comports() if (port.vid, port.pid) == (0x03EB, 0x6124)]
    return at91_ports

import chipwhisperer as cw
def program_sam_firmware(hardware_type=None):
    at91_ports = get_at91_ports()
    if len(at91_ports) == 0:
        raise OSError("Could not find bootloader serial port, please see https://chipwhisperer.readthedocs.io/en/latest/firmware.html")
    if len(at91_ports) > 1:
        raise OSError("Found multiple bootloaders, please specify com port. See https://chipwhisperer.readthedocs.io/en/latest/firmware.html")

    serial_port = at91_ports[0]
    print("Found {}".format(serial_port))
    prog = cw.SAMFWLoader(None)
    prog.program(serial_port, hardware_type=hardware_type)

program_sam_firmware("cwlite")
#5

It worked! Thank you so much really :slight_smile:

#6

Happy to help :slight_smile:

Alex

#7

hello, i used this code but it doesn’t work. Can you help me.
I always had these errors: raise OSError(“Could not find bootloader serial port, please see https://chipwhisperer.readthedocs.io/en/latest/firmware.html”)

#8

What OS are you running? Are you running a VM?

Alex

#9

hello
I use the debian OS. i’m installed the chipwhisperer in my debian machine.

#10

What do your udev rules look like? Is there an entry for the atmel bootloader? This is present in the current 50-newae.rules, but wasn’t present in older versions.

Alex

#11

I am getting the same error. My full error message is:
import chipwhisperer as cw
scope = cw.scope()

OSError Traceback (most recent call last)
Input In [1], in
1 import chipwhisperer as cw
----> 2 scope = cw.scope()

File e:\chipwhisperer\software\chipwhisperer_init_.py:335, in scope(scope_type, name, sn, idProduct, bitstream, force, prog_speed, **kwargs)
332 raise ValueError
334 if scope_type is None:
→ 335 scope_type = get_cw_type(**kwargs)
336 rtn : scopes.ScopeTypes = scope_type()
337 try:

File e:\chipwhisperer\software\chipwhisperer\common\utils\util.py:520, in get_cw_type(sn, idProduct, hw_location, **kwargs)
517 possible_ids = [0xace0, 0xace2, 0xace3, 0xace5]
519 cwusb = NAEUSB_Backend()
→ 520 device = cwusb.find(serial_number=sn, idProduct=possible_ids, hw_location=hw_location)
521 name = device.getProduct()
522 cwusb.usb_ctx.close()

File e:\chipwhisperer\software\chipwhisperer\hardware\naeusb\naeusb.py:329, in NAEUSB_Backend.find(self, serial_number, idProduct, hw_location)
327 dev_list = self.get_possible_devices(idProduct, attempt_access=(not hw_location))
328 if len(dev_list) == 0:
→ 329 raise OSError(“Could not find ChipWhisperer. Is it connected?”)
331 # if more than one CW, we require a serial number
332 if hw_location:

OSError: Could not find ChipWhisperer. Is it connected?

When I try and run the following in python, I get the error:
import chipwhisperer as cw
cw.program_sam_firmware(hardware_type=‘cwlite’)

Traceback (most recent call last):
File “”, line 1, in
File “e:\chipwhisperer\software\chipwhisperer_init_.py”, line 96, in program_sam_firmware
raise OSError(“Could not find bootloader serial port, please see Updating Firmware — ChipWhisperer 5.6.1 documentation”)
OSError: Could not find bootloader serial port, please see Updating Firmware — ChipWhisperer 5.6.1 documentation

When I use your code (both versions) I get an invalid syntax error on the last line.

This is on native Win10.

My CW has the dim blue and red lights. This all occurred after I attempted to run:
import chipwhisperer as cw
scope = cw.scope()
scope.upgrade_firmware()

I have been unable to use any commands to flash new firmware on the device. When I use scope = cw.scope() it asks me if the chipwhisperer is plugged in now.

Any help would be greatly appreciated.

#12

Hi,

If you open Device Manager, do you see a section called Ports (COM & LPT)? If so, do you see a device called AT91 USB to Serial Converter? It should look something like this:

image

Alex

#13

I do not. There is nothing between my network adaptors and my Print Queuer.

#14

Do you have your ChipWhisperer attached directly to the PC (i.e. through a USB hub or similar)? Also, if you’ve got another USB cable lying around, can you try switching the cables out?

Alex

#15

Alex,

I have it connected directly to the PC using the USB cable. I have tried two cables now. When I plug it in my computer does not indicate that anything has been connected and the indicator lights stay dimly lit red and blue.

#16

Do you remember how you deleted the firmware in the first place? Was it by trying to do scope.upgrade_firmware(), you did you short the erase pins on the device? If you haven’t shorted
the erase pins yet, try plugging in the ChipWhisperer and doing that, then unplugging+replugging.

Alex

#17

It was by using scope.upgrade_firmware(). I will try the erase pins now. Do you have a proper page that lists the instructions for that? I have been clicking links for about 20 minutes now trying to find the instructions but I cannot seem to find them.

#18

We’ve got CW1173 ChipWhisperer-Lite - NewAE Hardware Product Documentation. All you need to do is have those pins shorted when it’s plugged in, then do an unplug+replug.

#19

Thank you. I also faced this issue. Now it has cleared.