Questions tagged [serial-communication]
Process of sending data one bit at a time, sequentially, over a communication channel or computer bus. Most of the computer systems, and especially embedded systems, have such communication port.
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Reverse engineering of firmware update files for Crumar Mojo Classic
Hello all, The Crumar Mojo Classic is a type of organ (the musical kind, not the body kind) that tries to emulate the old Hammond/B3 organ sounds that are well known from Rock, Jazz et cetera as ...
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Encrypted UART communication protocol
I'm currently analyzing the communication protocol between an ultrasonic cartridge and the machine it operates with. The cartridge is a consumable, and my goal is to virtually recharge it. From what I ...
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Reverse engineering communication between an ultrasonic machine and its cartridge?
I'm reverse engineering the communication between an ultrasonic machine and its cartridge. I've successfully documented the communication of other machines, knowing all the information it exchanged ...
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What is the checksum algorithm for these messages?
I am attempting to reverse engineer a motor with an unknown CRC algorithm. I've used a logic analyzer to find these bytes, and I would like to send my own bytes back to the motor. Unfortunately, I can'...
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1 answer
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Help me find how the RFID copier writes the values in the tag
At first it may seems that it uses ascii but the values don't match. The numbers 1-15 seem to written in the first nibble(without knowing what the rest bits mean) For higher values i don't have a clue....
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1 vote
1 answer
230 views
Reverse engineering RS-232 motor controller
I have a motor controller and I'd like to communicate with it using Arduino. I can communicate with the controller using a software and I used it to sniff some data from RS-232 commnunication and ...
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1 vote
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Finding JTAG/UART Connections on smart doorbell
Trying to dump firmware of this device. I can't find the UART/JTAG connections. I've searched over it for awhile now; I feel like I must just be missing something.
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2 votes
2 answers
165 views
Reverse Engineer an ultrasonic cartridge communication with the station to bypass remaining uses
I Have an ultrasonic machine that has a cartridge with a set amount of uses. When that value gets to 0, the cartridge has to be disposed, and a new one bought. The thing is that with some maintenance ...
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1 vote
1 answer
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Microchip ATSAME70Q21-CN unable to connect with JTAG or SWD
First time delving into hardware reverse engineering and can't seem to connect using JTAG nor SWD. I found two identical devices that I'm trying to understand how they work and see if I can extract ...
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1 vote
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Reading/writing flash ROM connected to OMAP L138 without JTAG
I have a product that uses an OMAP L138 with a flash rom. There are a couple different models of this product available, but they all share the same hardware with the only difference being the ...
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3 votes
1 answer
272 views
Reverse Engineer 16 Bit error checking byte calculation
Hello =) I am attempting to reverse engineer a communications protocol to some obsolete equipment. Communication happens on an RS485 line. I have captured several exchanges and seem to have figured ...
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3 votes
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684 views
How can I disable watchdog in U-boot using mw command
So I have DVR with 2*Hi3511RBC CPU: ARM926EJ-Sid(wb) [41069265] revision 5 (ARMv5TEJ) and when I enter U-boot (how do I know that I'm in U-boot ? ) well over UART I get following message U-Boot 1.1.4 (...
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Greenpacket OH-735 onboard header
I got myself a Greenpacket OH-735 LTE outdoor unit. On the outside it has a SIM slot and an ethernet interface. Access to the web interface is pretty restricted, not much to set and it is branded with ...
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Reverse engineering what seems to be a checksum used for RS232 packets
I will try to be as concise as possible: the issue is, I'm trying to develop a custom application for a dielectric tester. I have access to the original program, which was made some 20 years ago or ...
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1 vote
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479 views
Getting rid of a custom Shell on a LiteOS based outdoor camera
I started reversing this camera in order to get rid of the unwanted traffic it constantly does towards Chinese servers. I have a serial access to it thanks to an obvious UART port (bottom left in the ...
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