CAN bus accidentally swapped TX and RX is it possible to solve (in firmware) without board rework

N

newbie_hs

Advanced Member level 4
Joined
Mar 4, 2023
Messages
113
Helped
1
Reputation
2
Reaction score
1
Trophy points
18
Activity points
892
I am interfacing an isolated can transceiver with my microcontroller.My schematic is given below.


Accidently TXD is connected to RXD of microcontroller and RXD is connected to TXD of the microcontroller.


My question can I solve this issue without any rework in the board?

May I know firmware persons can help us by doing some changes in thier code and making this interface up.

Is it possible to swap MCU CAN RX and TX in firmware.
 

Solution
Refer to S32K148_IO_Signal_Description_Input_Multiplexing.xlsx (Reference manual attachment), it gives a complete list of available multiplex settings for peripheral connection. Swapping CAN RX and TX isn't provided.
Sort by date Sort by votes
Not without reworking the board No. But quite conveniently Removing R353, R352 will disconnect/break the txd and rxd to allow you to use a axial resistor to cross the lines over without significant rework
 
Upvote 1 Downvote
I don't know what microcontroller you are using or if the serial routines use interrupts.
You can sometimes use serial bit bang routines to communicate with the controller while changing the TX and RX pins in the software.
 

Upvote 1 Downvote
Refer to S32K148_IO_Signal_Description_Input_Multiplexing.xlsx (Reference manual attachment), it gives a complete list of available multiplex settings for peripheral connection. Swapping CAN RX and TX isn't provided.
 

Upvote 0 Downvote
Solution
You must log in or register to reply here.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…