[En-Nut-Discussion] ATCAN repeats messages on Error
hmlists at focus-sw.com
Sat Sep 16 02:04:00 CEST 2006
Uwe Bonnes wrote:
> with my CAN Setup with a long, unterminated line, I can get the Ethernut
> AT90CAN128 to repeatedly send the message, hogging the CAN Bus.
> My program definitly only sends the message once.
> I know, an unterminated line is an user error, but the Ethernut driver
> should not hog the line in such an error.
> Any ideas how to handle this error more gracefully?
Never observed this issue and the controller should go bus-off after
repeated line faults to prevent exactly this.
In case there is no other node on the bus, the unit should have an ACK
error and go error-passive after 127 failed transmissions and bus-off
I am happy to assist with the fault analysis and also to improve the
driver if we find an issue in the driver.
Can you put some debug instrumentation in your arch/avr/dev/atcan.c code
in AtCanSendMsg and AtCanOutput to see what the driver actually does?
In particular I am interested if we get a TX interrupt and also the
status of the CAN Transmit Error Counter Register - CANTEC.
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