Can bus shield help

Using Arduino Networking, Protocols, and Devices
1

First off, let me say I have no idea the technical terms, so I do this stuff in my spare time for fun.

Ok, Im playing around with the canbus shield, and have a few issues because I just know little about it. Ive read every forum post about it, and then some.

Im wanting to set a filter mask so I only see certain traffic on it, and I can show that data on screen. I have already located the parts that I need, just no idea how to set mask for those.

Say the can data is

ID: 122, Data 80 0 FF 5C 60 C5 C A

I would like to use data "80 and 0" on one and "FF" on another

How would I set that mask?

  • set mask, set both the mask to 0x3ff <----Why 0x3ff?

*/

CAN.init_Mask(0, 0, 0x3ff); // there are 2 mask in mcp2515, you need to set both of them

CAN.init_Mask(1, 0, 0x3ff);

/*

  • set filter, we can receive id from 0x04 ~ 0x09

*/

CAN.init_Filt(0, 0, 0x04); // there are 6 filter in mcp2515

CAN.init_Filt(1, 0, 0x05); // there are 6 filter in mcp2515

CAN.init_Filt(2, 0, 0x06); // there are 6 filter in mcp2515

CAN.init_Filt(3, 0, 0x07); // there are 6 filter in mcp2515

CAN.init_Filt(4, 0, 0x08); // there are 6 filter in mcp2515

CAN.init_Filt(5, 0, 0x09); // there are 6 filter in mcp2515

2

0x03FF is the same as 1111111111 in binary, which tells tells the MCP2515 to check the first 10 bits of the CAN address. In most cases you would check 11 or 29 bits depending on the addressing scheme in use.

Is the 122 address in your example a decimal number?

3

I assume its decimal. The others are hex.

That's good info, I think I may have made a little sense of it from that. Going to try some things and see what happens