[ts-7000] Re: decode can massage - TSCAN1

[Joel Morgan <>]

On Dec 14, 2011 2:40 AM, "Zhang Jing" <> wrote:
>
>  
>
> hi, Joel,
>  
> I have read the read() and write() API, meanwhile I read readburst.c. If I wanna read the message from the userspace, I must call read() like:
> struct canmsg_t &readmsg;
> ret=read(fd,&readmsg,sizeof(can_msg));
> if(readmsg.id==0x305){
>     for(i=0;i<readmsg.length,i++)
>        can_data[i] = readmsg.data[i];}
>  
> My destination is: you know a model is running in the EP9302, then I wanna transfer the 8 byte data to the model and then make some computations, after that, send some data back to the can bus. Is my saying write?
>  

Rod said it much better than I could have.

Just one thing to add: Be careful about queue overflows on the sja1100. It has 8 receive and send buffers I think. First, design (or use) a good higher protocol that doesn't flood the bus with useless messages and fill the queues before you can empty them. Second, use the filters on the sja1100 if possible. Lastly, in busoff you can still write() and eventually fill the transmit buffer.

Regards,
-joel

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