xPC Target

Example 6

The next example shows the use of the CAN acceptance filters. First the Read depth parameter of the FIFO Read block is set back to a value of 2. Then the identifier of the second standard message is changed from 114 to 188. The goal is to filter any CAN messages with an identifier larger than 127 what would mean that the receive FIFO would never contain the CAN message with identifier 188. Additionally the FIFO Filter block, filtering CAN message with identifier 114 is changed to filter the message with identifier 188.

For this the Acceptance Filters parameter of CAN port 2 in the FIFO Setup block has to be set accordingly:

• [2047-127, 0, 0, 0]
  

By rebuilding and re-executing the target application the following can be observed:

• Scope with Id 6 shows 0 for all elements of the vector leaving the corresponding FIFO Filter block. The message with identifier 188 is never received.
• Scope with Id 3 shows one of the data traces always being zero.
• Scope with Id 7 shows a value of 1 which reflects that the Read depth could be reduced to 1, because only one message per millisecond reaches the receive FIFO now.

You can display the model by typing, in the MATLAB command window, either is xpccanpcififo6.mdl or xpccan104fifo6.mdl.

Example 5

UDP I/O Support