Classic CAN using mcan in LPC546xx

[hemanthvasista]

Hello ,

Are there any sample code/example for usage of classic CAN in LPC54628?

regards,

Hemanth

[Alice_Yang]

Hello Hemanth S,

There is CAN demo under MCUXpresso SDK for lpc54628, it support MCUXpresso IDE,

keil and IAR, you can download from:

https://mcuxpresso.nxp.com/en/select   

Regards,

Alice

[williamcarlisle]

Yeah, those SDK examples are worthless. They use function macros that you cannot follow into the code to find out why the example does NOT work.

[hemanthvasista]

Hello Alice,

The both example in SDK are mostly CAN FD based.

Are any sample code for Classc CAN and not CAN FD?

regards,

Hemanth

[Alice_Yang · Accepted solution]

Hello Hemanth,

Just change the definition to 0:

#define USE_CANFD (0U)

Hope it helps,

Alice

[hemanthvasista]

Hello Alice,

Thanks for your inputs.

I had more queries regarding the CAN usage:

1. Which is the recommended work flow for Receiving the CAN messages?
CAN Bus-> RX FIFO -> Application Buffer
CAN Bus-> RX Buffer -> Application Buffer

2. I am able to receive messages based on CAN filter configuration.
But when I tried to read the received message ID from the structure "mcan_rx_buffer_frame_t",

it show some value which is not the same which I configured to receive.
The CAN RAM location also seem to contain this value.

e.g. for msg ID 0x11 (STD ID) -> 0x00464022 (R0 bits figure 133 in manual)
       for msg ID 0x21 (STD ID) -> 0x00864042 (R0 bits figure 133 in manual)

So even tough the message are correctly received in FIFO/Buffer,

I am unable to read-back the message ID from the structure.

regards,

Hemanth

[Alice_Yang]

Hello Hemanth,

Why do you think "it show some value which is not the same which I configured to receive.",

what value do you read ?

There is no problem about the ID in below:

e.g. for msg ID 0x11 (STD ID) -> 0x00464022 (R0 bits figure 133 in manual)
       for msg ID 0x21 (STD ID) -> 0x00864042 (R0 bits figure 133 in manual)

Regards,

Alice

[hemanthvasista]

Hello Alice,

Thanks for you inputs, I was looking in wrong bits (11:0)

any inputs for other question?

[Alice_Yang]

Hello Hemanth，

“

1. Which is the recommended work flow for Receiving the CAN messages?
CAN Bus-> RX FIFO -> Application Buffer
CAN Bus-> RX Buffer -> Application Buffer

”

I think both can ok, recommend you refer to demo, thanks.

Regards,

Alice