Post by thread:Software-CAN?

Hi Has anybody tried to write a CAN communication layer on a small PIC? The planned CAN controller is much too big for simple applications... Regards -- 4L GmbH Tel: +41 62 867 4000 Martin Schmid Fax: +41 62 876 3111 Oberzeiherstr. 1 > new e-mail address < CH-5079 Zeihen spam_OUTmschmidTakeThisOuTdatacomm.ch is obsolete

Hi Martin, I think that CAN spec is a bit too resource greedy to work well on little PICs, perhaps you could try a small Alterra part using a CAN design note (probably in their CDROM) , these are a sophisticated programable logic part. regards, Graham Daniel Martin Schmid wrote: {Quote hidden}> > Hi > > Has anybody tried to write a CAN communication layer on a small PIC? > The planned CAN controller is much too big for simple applications... > > Regards > > -- > 4L GmbH Tel: +41 62 867 4000 > Martin Schmid Fax: +41 62 876 3111 > Oberzeiherstr. 1 > new e-mail address < > CH-5079 Zeihen .....mschmidKILLspam@spam@datacomm.ch is obsolete

Well I have been thinking about doing it for a long time but I havn't done anything yet :). The obivious restriction would that it would have to run pretty slowly. I think 50 pkts/sec should be easily doable on a '84. This corresponds to 5000kbits/sec (assuming 100bit packets - all 8 bytes full). I would probably use RS485 as a physical layer (with my data out connected to the control pin of the transciever). So, I think implementing the protocol is doable, just so long as you don't want to connect it to real CAN devices. MD On Fri, 24 Jul 1998, Martin Schmid wrote: {Quote hidden}> Hi > > Has anybody tried to write a CAN communication layer on a small PIC? > The planned CAN controller is much too big for simple applications... > > Regards > > > -- > 4L GmbH Tel: +41 62 867 4000 > Martin Schmid Fax: +41 62 876 3111 > Oberzeiherstr. 1 > new e-mail address < > CH-5079 Zeihen mschmidKILLspamdatacomm.ch is obsolete >

We have a CAN to RS232 that uses a PIC16C66. Look at it at; http://www.emicros.com Martin Schmid wrote: {Quote hidden}> > Hi > > Has anybody tried to write a CAN communication layer on a small PIC? > The planned CAN controller is much too big for simple applications... > > Regards > > -- > 4L GmbH Tel: +41 62 867 4000 > Martin Schmid Fax: +41 62 876 3111 > Oberzeiherstr. 1 > new e-mail address < > CH-5079 Zeihen .....mschmidKILLspam.....datacomm.ch is obsolete -- From: Ron Russ EMICROS - Embedded Micro Software (http://www.emicros.com) CANPORT - Lowest cost PC to Controller Area Network Adapter (http://www.emicros.com/canport.htm) CANTEC11 - 68HC11 SBC with Controller Area Network (http://www.emicros.com/cantec11.htm)