FlexCAN's Mailbox and Message Buffers

[symplesky]

I am reading the manual, but I am a bit confused about the relationship between Mailbox and Message Buffers. Are they the same thing?

微信图片_20210830124405.png

[Senlent]

Hi@symplesky

S32K-RM 55.5 Functional description:

      The mailbox system is composed of a set of message buffers (MB) that store configuration and control data, time stamp, message ID, and data (see Message buffer structure).

Message Buffer Structure.

Senlent_3-1630302439653.png

BR!

     Jim.

[symplesky]

Thank you for your reply, Jim. There are totally 32 Message Buffers in CAN1, when I set the Mailbox number with 16, dose it means every Mailbox have 2 Message Buffers? 

[Senlent · Accepted solution]

理解的不对，

参考上一个回答图片中的内容，每个MB的大小是可以配置的，所有的MB处于RAM的一段连续空间，当你使用信箱的时候，你需要先选择MB的大小（16，24，40，72）,当然这个大小和CAN标准有关（CAN2.0或者CAN FD）。如果配置为FIFO，又有些区别。