S32KのトピックRe: Numbers of CAN frames stored in a Message Buffer

Numbers of CAN frames stored in a Message Buffer

KKumar — Thu, 03 Nov 2022 05:51:55 GMT

Hi NXP,

How many CAN message frames is stored in a particular Message Buffer??

This number not mentioned in RM.

Re: Numbers of CAN frames stored in a Message Buffer

Senlent — Mon, 07 Nov 2022 01:30:50 GMT

The Message buffer structure can represent standard frames (data length of 0-8 bytes) and extended frames (data length up to 64 bytes) of the CAN 2.0 protocol. Each independent MB consists of 16 or 24, 40 or 72 bytes, corresponding to 8 or 16, 32 or 64 in the number of massages;

Senlent_0-1667784559829.png

Re: Numbers of CAN frames stored in a Message Buffer

KKumar — Mon, 07 Nov 2022 03:38:27 GMT

Hi @Senlent

May be my question is not clear.

What i want to understand is deep of a particular MBs??

Suppose I configured 1st MB of CAN1 to receive only CAN ID 0x01 then how many CAN frame it store without being lost.

Thanks

Kishore

Re: Numbers of CAN frames stored in a Message Buffer

Senlent — Mon, 07 Nov 2022 06:06:19 GMT

Hi@KKumar

just one,one MB can just store one frame each time.

if a new message comes from outside, the MB's code area will tell there is free to receive or not.

you can take a look at the chapter 55.4.3 Message buffer structure(S32K-RM Rev 13)

-CODE — Message Buffer Code