Questions tagged [can]
CAN stands for Controller Area Network and is a bus often used in automotive applications. It is a two-wire differential protocol and works on baud rates from 10 kbits/sec to 1 Mbits/sec.
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Some questions about CAN transceivers
I bought different type of CAN transceivers: Two with an CJMCU2551 (left in the picture below). and four with TJA1050 (right in the picture below).
CJMCU2551 (left) has pins: VCC, GND, CTX, CRX, CANH,...
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Interfacing CANSPI with problems
I am running a PIC18F with an HS oscillator of 40 MHz. The hardware is not the problem and all the connections are properly done. The microcontroller is connected to the MCP2510 (with a parallel ...
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Multiplexed CAN Bus
I have a need to mux the CANH/CANL lines from a single MCU controller/transceiver to multiple pins on an existing connector series. The flow I am looking at would be something like:
MCU <--> Xcvr ...
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CAN bus on bread board without 120 ohm terminating resistors?
I have developed a CAN bus between two STM32s on two breadboards. My transceivers are MCP2551 ICs. I have faced something weird, the transfer of data becomes possible only when I remove two 120 Ohm ...
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Understanding ISO-TP, Flow Control and Blocksize
I am currently trying to understand can communication using the ISO 15765-2 (ISO-TP) and Unified Diagnostic Services (UDS) Protocols using can.
At this point I have a question about the Flow Control ...
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ESP32 TWAI/CANBus bus errors cause bus off state
I have multiple devices using ESP32-WROOM-32E and TWAI (CAN). There was an issue where they would have bus errors and then fail to recover via twai_initiate_recovery(). I solved the recovery issue by ...
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CANBUS troubleshooting
I'm currently having some trouble communicating my motors to a Speedgoat real-time target machine.
Setup:
My current setup includes the Speedgoat IO691 (CANBUS) module (https://www.speedgoat.com/...
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STM32 FDCAN Duplicate Messages
I'm working with the STM32L552ZEQ, and I'm noticing that it is sending duplicate CAN transmissions.
I have two threads, one that adds transmissions to a FreeRTOS queue, and one that spins and ...
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MCP2551 sending with 4V differential voltage
I'm working on a CAN Bus Module with ATMEGA328P, MCP2515 and MCP2551. In my test setup, I have the module connected to a Raspberry Pi with a CAN hat.
The communication works in general - both nodes ...
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Hooking up a device which is powered externally, to the OBD port of a car
I have a device called AutoPi (https://www.autopi.io) which is simply a Raspberry Pi Zero aggregated with a couple of more components.
The device takes it's power from the OBD port.
I want to make ...
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What are the types of ports used in Engine Control Module?
What are the connection ports associated with a real life Engine Control Module? I mean what does a CAN bus and related port look like once implemented?
I know the theory of CAN and its electrical ...
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