Can-Bus problem

[truf9]

Posted on February 15, 2008 at 10:35

Can-Bus problem

[truf9]

Posted on May 17, 2011 at 09:49

Hello,

I use the STR91x library for can-bus communication. The receiving messages are handled in the CAN-interrupt. The transmission is made in the main-program. I have following messages: 1) Transmit messages (for example ID 581) 1) Receive messages (for example ID 601) 3) message for the remote frame is configured as receive-message for guarding (for example ID 701) The request of remote frame runs over 1000000 messages without lost of a message. Now the problem: If a receive message (601) came short before remote frame , the receive message (601) is requested with the related transmit message (581), but it could be, that the transmit-message for the remote frame isn't on the bus. I included counters for receving and transmitting remote frame. The message is not on the bus, but the sendmessage-routine is executed without errors. The counters are correct. I don't know how to solve this problem. I work with Keil uVision. Best Regards, TRuf

[truf9]

Posted on May 17, 2011 at 09:49

Hello,

I have downloaded the new ST-Library V2.0. The problem decscribed at 11.02.08 is solved. But now I have a problem with the data of sendmessage. I toggle the transmitted data for CanOpen-Guarding. With the new STR91x.lib sendmessage transmit the old data in the message-buffer and not with the toggled Bit from software. I think thats's a problem of the library. In the old library CAN_SendMessage handles allways Message-object[0] and CAN_ReceiveMessage allways Message-object[1]. In the V2.0 of STR91x.lib CAN_SendMessage calls CAN_UpdateMsgObj() and CAN_TransmitRequest(). CAN_UpdateMsgObj() writes the data of the message in Message-object[0]. CAN_TransmitRequest() calls msg_if = GetFreeIF() and transmit the data of Message-object[msg_if]. If msg_if=1 the false data are transmitted. Could this the problem for false data with sendmessage??? Best Regards