We need a can bus communication. I’ve tested the GHI example (NETFM 4.1 SDK) with 2 USBizi – and 2 SN65HVD235 transceivers. The write example runs on USBizi 1 and the read example on USBizi 2. To differentiate the two, the LED went on each time if data was sent. No errors occurred, but there didnt arrive any data if I set the breakpoint in the read event. In the next step I measured the voltage on CAN1 TD during data send. There is a constant voltage of 3.3 V, no peaks. The same procedure works in the SPI example on pin 11 and 13. Is it a normal state on CAN bus?
Hi,
can you please send us a minimal configuration (hardware wiring) and software (the sample program in the user manual?) that can be used to put messages on the CAN bus and read these messages with another module from the same bus?
At the moment we think that there is a problem with your CAN implementation because we are unable to send and receive messages even with the Fez Domino evaluation board.
Has anyone used the CAN library successfully?
thanks
Sincerely
Holger
However the transceiver may be connected or even not connected…
If the CAN software is installed correctly and you make a periodical write command you should measure on the Port Pins P0.0 and P0.1 of LPC2388 some traffic.
Am I right?
Not really, if the RX is in “dominant state” then nothing will happen on the bus. Also, many errors on the bus causes CAN to go into “bus off” condition, where it is basically off.
We tried to communicate via CAN between 2 FEZ Domino Boards. We use the transceivers SN65HVD235.
But I am sure that there must be any traffic (data frames) at TX (P0.1 respectively pin 7 of the connector of the board) at least at the very beginning. But there is nothing at all that could be measured!