How do I setup Flexcan fifo on k64?

[ahmedsobhy]

I have the Flexcan module on the K64 setup to receive data from the CAN bus using Message Buffers. I setup each Message buffer with a specific ID to listen to and receive the info from the bus.

Everytime a message is received the module causes an Interrupt. I then read the data from the message buffer and so on. I would like to know if there is a better implementation using FIFO buffers for example, that would not cause any messages to be dropped and at the same time reduce the workload on the MCU.

Thank you,

Ahmed.

[ahmedsobhy]

Thank you Fang. I am using one of the example projects actually as a template. What I am interested in is the receiving not transmitting. I have made some modification to my code since that time is that I setup several MBs on the flexcan module to the IDs I want to recieve on the bus, then since I know that the message are gonna be sent as a burst and in order I interrupt only once when the last message is received and this is how I reduce the number of times the MCU has to context switch to run the interrupt and store then data.

[miduo]

Hi,

Please make reference from the FlexCAN project that was released for the Kinetis K6X. You can find the project in the KINETIS_SC.zip file on NXP website. There is a "can_loopback_node" project included that has example CAN driver code. Thre is an ISR that can handle transmit included. The FlexCAN_Poll_TxMBs() function in the can.c file is probably of the most interest to you. The function references polling, but it is called by the MB isr function.