18F258 with 25050

[victor moreno]

Dear PCM programmer,

When I try to send a message from PIC18F258 to MCP25050, so, when I load the transmit buffer (TXBnEIDH, TXBnEIDL, TXBnSIDH, TXBnSIDL, TXBnDLC and TXBnDm) and after I request for sending a message (TXBnCON |= 0x08), TEC counter arrives at 128 and TXBnCON passes to 0x18 (CAN Error Bus), CANSTAT passes to 0x02 (Error interrupt) and PIR3 passes to 0xA0 (Invalid message flag and CAN module error flag).



I tried to load the transmit buffer in both modes (Normal and Config) but nothing



I work with 50Kbps. SJW=1, Prop=1, PhSeg1=3, PhSeg2=3, Wake-up filter disabled, Sample point 1x



My 25050 node is configured in Normal mode (OPTREG1.CMREQ=0), Receive Overflow (OPTREG2.CAEN=0), No Transmit on error, Sleep disable, Mesage type RTR for IRM (OPTREG2.MTYPE=0) –I think this is enough to receive messages in 25050 RXF0 (IRM) or in 25050 RXF1 (IM)-.



I have no problems to receive a message from 25050 to 258, so I think that hardware is ok. My transceiver in both nodes is MCP2551 and I test with and without 120 termination in both ends with the same result.



I’m using PIC 18 CAN routines (AN738) with correct TRISB and CIOCON.





Where it could be my problemm?





Thanks,





Victor Moreno

Lausanne


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This message was ported from CCS's old forum
Original Post ID: 13654

[PCM programmer]

:=Dear PCM programmer,
:=
:=When I try to send a message from PIC18F258 to MCP25050, so, when I load the transmit buffer (TXBnEIDH, TXBnEIDL, TXBnSIDH, TXBnSIDL, TXBnDLC and TXBnDm)
---------------------------------------------------------
I can't really help you, because I don't use the PCH compiler
or the CAN chip.
___________________________
This message was ported from CCS's old forum
Original Post ID: 13662