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Results tagged with can
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user 56411
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.
8
votes
What is the limiting factor for a CAN bus to exceed 1Mbps bandwidth?
It can. Meet CAN-FD.
Why was a new protocol needed? CAN is a multi-master bus with arbitration and error reporting. … That, along with backwards compatibility requirements, led to CAN-FD.
Classic CAN at 1 Mbps is limited to a 40-meter bus length. (In practice, I think it's lower due to stray capacitance.) …
- 22.3k
3
votes
CAN- "Messages have ID's not nodes"
For example, if you have a temperature sensor broadcasting data, you can assign an ID number to mean "temperature data from sensor #1". Then any node that cares about temperature data can receive it. … CAN controllers can easily send and receive multiple IDs, so it often doesn't make sense to say that a node has only one ID. …
- 22.3k
0
votes
Does STM32F0-ecosystem always need at least 2 controllers for CAN transmit to work?
Standard CAN requires two nodes so that ACKs will be sent. Nodes don't ACK themselves. If you only have one node, you can get a CAN adapter for a PC to act as a second node. …
- 22.3k
16
votes
Accepted
How to deal with signed int overflows
In C, you can do it by starting with unsigned values and using bitwise operators, like this:
uint16_t highbyte, lowbyte, data;
highbyte = get_can_byte(); //Do whatever you normally do to get the bytes … Things like bitwise operators can behave differently or produce undefined behavior when used on signed values. In general, whenever you're doing bit manipulation, use unsigned values. …
- 22.3k
1
vote
CAN bus simulation (automotive purpose) - tried Arduino and SparkFun
You can get one with an OBD-2 connector if that's what you need. …
- 22.3k