The CAN Bus monitor reads each packet on the bus and displays it on a colour TFT 240×135 display. For each packet the following information is displayed:
No: The packet number since monitoring started, displayed in decimal.
PacketID: The packet ID; an 11-bit identifier for standard packets, or a 29-bit identifier for extended packets, displayed in hexadecimal.
Data Hexadecimal: Up to eight bytes of data, displayed in hexadecimal.
Data ASCII: The same data shown in ASCII.
I tested the CAN Bus Monitor using an Adafruit Feather M4 CAN Express  to generate packets, by running a test program based on their feather_m4can_tx example. It uses the Adafruit CAN Library, which is based on Sandeep Mistry’s library.
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