5
votes
Accepted
Hex timestamp decode
import sys
import os
if(len(sys.argv) != 2):
sys.exit("usage %s 0xdead" % os.path.basename(sys.argv[0]))
if((sys.argv[1].startswith("0x")!=True) or (len(sys.argv[1])!=6 )):
sys.exit("0x ...
- 16.7k
4
votes
Accepted
Need help with a USB gaming mouse
my understanding of USB is very low at best (even if I do develop some simple USB devices for a living) so read this with major prejudice...
Your driver class and configuration must match the USB (...
- 1,384
4
votes
Accepted
Reverse engineering serial communication CRC algorithm
This question seems simpler than you might expect.
Since as OP noted, the code is irrelevant to validation mechanism used in the discussed system, I shall ignore it. It is indeed irrelevant as will ...
- 11.8k
4
votes
Accepted
Reverse engineering the IBM BSC (Bisync) protocol
SOLUTION
I got help from a guy named Peter. He gave me a piece of test code in C. The CRC algorithm looked pretty similar to the ones I already tried. But what was important was that he pointed out ...
- 71
4
votes
Reverse engineering the IBM BSC (Bisync) protocol
If you have known data and a known CRC, and an unknown value (like the initial CRC value or the final XOR value), you can always loop through all possible values and find those that give you the ...
- 343
3
votes
Why can't I decode this UART signal?
Answering my own question: just figured out that the board that the CP2102 decoder was mounted on had a LED wired to the RXD line. It happens that this board was poorly designed, and this LED was set ...
3
votes
Reverse engineering USB peripheral driver
Well, your question is a bit broad as it stands, but let's take it one by one. Typically (but not always) drivers for printers these days are user mode drivers (UMDF), which means you're looking for a ...
3
votes
Accepted
2byte checksum for serial traffic
It is a CRC-A checksum. 16bits.
Preface: From my research this is the crc for that standard.
Its calculated from start of packet up to checksum
https://crccalc.com
Put 8209 and check the result: ...
- 178
2
votes
Decoding proprietary 485 comms
I managed to decode the protocol on XYE connection. My findings are here https://codeberg.org/xye/xye
The XYE connection is the bus between a central controller and the indoor units. The bus from the ...
- 21
2
votes
Reverse engineering checksum from RS-485 device
The protocol spec clearly does not apply to your device, so don't bother trying to use its checksum calculation. However it may be similar enough to provide some clues to the actual protocol.
The ...
- 226
2
votes
Sniffing serial Bluetooth traffic on Android
According to this StackOverflow answer, Android has a setting in Developer Options from 4.4 onwards. You first need to enable Developer Settings (if you have not done so already), then enable “Enable ...
- 171
2
votes
UE Megaboom serial protocol
If the device doesn’t respond to unsolicited traffic, it probably needs some specific commands to return results. You could try bruteforcing it by sending random data but it’s a chancy business.
A ...
- 36.9k
2
votes
Identifying a toner chip and its communication protocol to re-program it
If you have a Brother printer you can use these instructions I found on Amazon on how to reset your cartridge chip, it worked for me.
"I was able to reset my toner cartridges for this model by using ...
- 21
2
votes
Finding JTAG/UART Connections
In the second picture on the bottom there is an nonpupulated connector, whose pins are labeled RX and TX. Thats at least one of maybe more uart interfaces.
You should additionaly check the traces on ...
- 131
2
votes
Accepted
Decipher variable length serial protocol
I understand your Arduino serves as a relay in the middle between the controller and the LCD. What you could do (not extremely exciting, but you did not mention whether you made similar experiments ...
- 1,974
2
votes
Help decoding this UART serial signal
Every UART packets contains a start bit what is always 0 and 1 or 2 stop bit(s) what is/are always 1. If you check the middle of your trace there are single 1 bits with some spaces between them. Every ...
- 98
2
votes
Accepted
Reverse engineering 12-byte serial packets from doorbell
Based on how you have laid it out, you look to have it mostly mapped out correctly,
The preamble (control device wake up) would be a general broadcast message to all units on the data bus, (The pull ...
- 136
2
votes
Wrong keyboard strokes sent to serial in putty
You have probably tried already but other baud rates?
9600, 1200, 2400, 57600
Seems like 8,N,1 is common?
8 DATA, No parity, and 1 STOP bit
Maybe helpful?
https://stackoverflow.com/questions/...
- 188
2
votes
Reverse UART communication protocol
From my question:
It seems to work :)
Is the message length
more or less ;)
See procedure bellow
Still wondering if it's a "common/standard protocol"?
Procedure
I have removed the module ...
- 141
2
votes
Accepted
determine proprietary 16-bit floating-point format
Maybe it is the temperature in Kelvin: 311 - 80/2 = 217K = -2.15°C
Or the offset is different than 80/2. A 16-bit floating-poitn format, especially a different one from IEEE-754 is highly unlikely. ...
- 136
2
votes
Reverse Engineer 16 Bit error checking byte calculation
So, after reviewing This following Stack Overflow Question
I opened up an excel and made some tests and effectively
Sum of all bytes is the calculation
Hex ff 00 00 04 00 00 00 00 00 13 00 ...
- 151
2
votes
Accepted
Reverse Engineer an ultrasonic cartridge communication with the station to bypass remaining uses
I think its pretty obvious it is my first time doing this.
Example: FB 05 01 03 86 00 8E BF
FB: Opens comm
05 01 03: Cartridge model
86 00: The actual number. 86 = a, a = X/150, 00 = b, b = X%150, ...
- 41
1
vote
Reverse Engineering RS232 protocol misterious last byte
Without access to the code it’s hard to say for sure but I think it’s some kind of sequence number. I’d suggest trying to record as many sequences as you can and try sending the replay on your own to ...
- 36.9k
1
vote
Can a secondary UART be used to access the MCU?
I see the following possibilities:
intercept Bluetooth communication and inject bogus packets to crash the CPU firmware and hopefully achieve code execution. This is very difficult to do blindly ...
- 36.9k
1
vote
Accepted
id the HW port and protocol
It seems CSB is Chip select, and MISO (Master in/Slave out) is a typical name for an SPI pin.
- 36.9k
1
vote
Help determining pinout for communications port
I think the pinout is the following according to Server Back-Up PC Board manual:
- 11
1
vote
How to identify SWD (Serial Wire Debug) pinout?
Not aware of any similar software tools for SWD, but:
If you can see or infer the chip part number, look at the data sheet.
Look for test points (or connectors) that may be used in factory ...
- 55
1
vote
Reverse engineering USB peripheral driver
Answers to this question deal with generic reversing of USB devices, but if you want to start from the driver files, find the printer in Device Manager, go to properties, then Driver tab-Driver ...
- 36.9k
1
vote
Reverse engineering USB peripheral driver
I am more familiar with linux but some steps are similar. To find where is your driver, I believe that if you plug your device and go in the Device Manager, click right on the device then properties, ...
- 226
1
vote
Accepted
What process should I follow to sniff USB serial packets and then replicate them?
Well for starters you are going to want an in Kernel USB monitor like Linux has, a pass through USB analyzer (more expensive, but more flexible) or something like a logic analyzer.
Here is a video ...
- 2,330
Only top scored, non community-wiki answers of a minimum length are eligible