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flexcan_remote_request

flexcan_remote_request#

Overview#

The flexcan_remote_request example shows how to use remote request feature by SDK driver.

In this example, 2 boards are connected through CAN bus.

Board A send a remote frame to request message from board B.
After successful request, board A will receive response message with same mailbox as transmit mailbox.
Board A will block until response message is received.

Board B receive remote frame and send response message automatically, but do not save remote frame.
After successful response, board B will update response message and wait for next remote request.

Supported Boards#

MIMXRT1060-EVKB
Hardware requirements

  • Mini/micro USB cable

  • MIMXRT1060-EVKB board

  • Personal Computer

Board settings

The example requires 2 sets of boards, each of them are mounted with the base board. Using a male to male CAN cable to connect the CAN2 instance (J42) between the 2 base boards.

Prepare the Demo

  1. Connect a USB cable between the PC host and the OpenSDA USB on the board.

  2. Open a serial terminal on PC for OpenSDA serial device with these settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  3. Download the program to the target board.

  4. Either press the reset button on your board or launch the debugger in your IDE to begin running the example.

Running the demo

After connecting the two boards, these instructions display on each terminal window. One board must be chosen as node A and the other board as node B. (Note: Node B should start first) Data is sent continuously between the node A and the node B.

This message displays on the node A terminal:

******* FLEXCAN Remote Request EXAMPLE *******
    Message format: Standard (11 bit id)
    Message buffer 8 used for Request.
    Message buffer 8 used for Response.
    Interrupt Mode: Enabled
**********************************************

Please select local node as A or B:
Note: Node B should start first.
Node:a
Press any key to trigger one-shot remote request

Remote request complete!
Response message word0: 0x0, word1: 0x55
Response message Timestamp: 17487

Remote request complete!
Response message word0: 0x1, word1: 0x55
Response message Timestamp: 9324

Remote request complete!
Response message word0: 0x2, word1: 0x55
Response message Timestamp: 33419


This message displays on the node B terminal:

******* FLEXCAN Remote Request EXAMPLE *******
    Message format: Standard (11 bit id)
    Message buffer 8 used for Request.
    Message buffer 8 used for Response.
    Interrupt Mode: Enabled
**********************************************

Please select local node as A or B:
Note: Node B should start first.
Node:b
Start to wait request from Node A

Remote response complete!
Update next response message.

Remote response complete!
Update next response message.

Remote response complete!
Update next response message.

Note: This case will be blocked when transferring data on armgcc debug/sdram_debug target. This issue has been fixed in later release by open ERR005829 feature.

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