Hello to all,

I'm using some PICs (18f4680) with 2551 transceivers on a CAN network. I'm
using the Microchip ECAN 'C' library (with some bug corrections) compiling
with MPLAB C18.  I'm having some problems  filtering some messages on my CAN
network.

To make a long story short: I have a pack of messages with IDs 0x40 to 0x43
that should be accepted by RXB0 and another pack with ID = 0x206 that should
be accepted by RXB1.
The main problem is that the messages with ID = 0x206 are never accepted.
I'm sure that is not a hardware issue, since I re-checked everything and the
hole system (except the filtering) is working smooth.

Below it's a simplified code of my RunTimeInitialization function (I put the
register equivalency on the comments for those who doesn't use ECAN 'C'
library).

void RunTimeInitialization(void)
{

   // Enter Config mode to be able to change settings.
   ECANSetOperationMode(ECAN_OP_MODE_CONFIG);

   // Select Functional Mode 1
   ECANSetFunctionalMode(ECAN_MODE_1); // Besides selecting mode,
enable the filters: RXFCON0 = 0x03;

   // Link RXF0 to RXB0 and RXF1 to RXB1
   ECANLinkRXF0F1ToBuffer(RXB0, RXB1); //RXFBCON0 = 0x10;
   ECANLinkRXF0Thru3ToMask(ECAN_RXM0, ECAN_RXM1, ECAN_RXM0,
ECAN_RXM0); // MSEL0 = 0x04

   // **** Set filters and masks ****
   // RXB0 should accept IDs from 0x040 to 0x043
   ECANSetRXF0Value(0x040, ECAN_MSG_STD); // RXF0SIDH = 0x08; RXF0SIDL =0x00;
   ECANSetRXM0Value(0x7FC, ECAN_MSG_STD); // RXM0SIDH = 0xFF; RXF0SIDL =0x80;

   // RXB1 should accept ONLY ID 0x204
   ECANSetRXF1Value(0x204, ECAN_MSG_STD); // RXF1SIDH = 0x40; RXF1SIDL =0x80;
   ECANSetRXM1Value(0x3FF, ECAN_MSG_STD); // RXM1SIDH = 0x7F; RXF1SIDL =0xE0;

   // ********************************

   // Set 125kbps @ 18MHz
   ECANSetBaudRate(2, 4, 7, 7, 2);

   // Return to Normal mode to communicate.
   ECANSetOperationMode(ECAN_OP_MODE_NORMAL);

}


I'm sure there's a lot of people here that already worked with CAN.
Any ideas?


Regards,


*PTav*
*Computer Engineer*
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