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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CAN Protocol traced routed with 90 ohm characteristic impedance
I am using ISO1042BDWV in my board. The schematic is given below. I know that the characteristic impedance of the CAN bus is 120 ohm.
The layout team routed CANH and CANL as 90 Ω differential. The CAN ...
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CAN communication with ACK bit
I'm new when it comes to CAN communication and the embedded world. I'm working with a TC322 microcontroller and am trying to configure a CAN controller.
As per my understanding:
If the receiving node ...
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Powering LED from a CAN bus signal
I am looking for a can it be done and, if someone is willing, a how to.
I am building an OBD2 breakout box for easily scoping automotive computer data lines and want to add LEDs as a quick visual of ...
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MCP25625 loopback mode reponse
In the loopback mode of the CAN MCP25625, if we load and send data on the TXB0 buffer, are we supposed to receive a RXB0 buffer ready and filled with data in the TXB0 buffer?
If yes, the following are ...
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AT32F403AVGT7 how to set CAN baud rate for this controller
I am using AT32F403AVGT7 controller but I am not getting any CAN response due to incorrect baud rate. Does anyone know how to set baud rate for this controller? I will share my code below:
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Most efficient way to handle addressing / termination in a daisy-chained CAN bus?
I'm working on some devices that will talk to each other over CAN. The simple idea is to daisy chain essential signals between each device: power (+12V and ground), enable and CAN high / low.
Now, ...
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CAN-FD bit stuffing worst case standard identifier arbitration phase
This question arises from another one where the bit stuffing in data phase was under discussion.
I replicate the computation performed in this document, but according to my computation the stuff bits ...
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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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Convert RS232 signal to I2C/CAN/MAVLink signal
I have an airspeed sensor that outputs a RS232 signal: https://www.aeroprobe.com/micro-air-data-system/. I want to connect this sensor to the Pixhawk in order to use the data for my controller ...
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What can cause these CAN signal distortions?
I occasionally observe signal distortions on CAN H, CAN L, and so also the differential signal. It is causing the microcontroller (dsPIC33) to report so-called Invalid Message Receive (IVR) errors. ...
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CAN Bus sniffing on ECU System
I'm working on designing a communication interface for a poorly documented system that has a proprietary CANbus system.
I want to monitor/listen to the CANbus traffic during system operation to ...
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Logging CAN bus load over time
I have used CANKing, which displays the bus load in real-time. However, I would like to do some long-term monitoring to see what the load looks like over time.
This site claims to have free software ...
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Debugging CAN bus
My Ford S-Max 2014 seems to have issues with the CAN bus, and refuses to start. When hooked up to Fords own diagnostic tools, it complains that the engine ECU doesn't reply. The ECU gets power, and ...
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RS485 to CAN converter
I want to design where a RS485 Device Sensor reads inputs and the information it reads and sends is converted to CAN (Arduino UNO R4 Minima with CAN built in, or ESP32 with CAN built in)
Is this ...
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Is there any way to get a smaller SPI clock speed specifically to only one SPI slave?
I have 3 modules connected by SPI through an ATMEGA328P MCU as shown in the circuit and I have some doubts over the clock speed of the bus.
I have a 8Mhz clock on the MCU which I am assuming sets the ...
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