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TMS570LS1227: CAN message box direction configuration

Part Number: TMS570LS1227
Other Parts Discussed in Thread: HALCOGEN

Good morning sirs,

While configuring the message boxes for the TMS570LS1227 I came with a doubt.

If we check halcogen tool it seems that mailbox direction is configurable 

But looking in code generated I don't see any specific change depending on direction.

Looking in reference manual, bits referring to CAN TX IO configuration are just used in case we used the pin as GPIO.

While direction of each mailbox seems to be defined dynamically by assigning the mailbox number to IF1N (for transmit) and IF2NO (for reception). Is that right?