Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Keil/AT32F405xx_v2/CAN1/BTMG#0x0
Bit timing register
Baud rate division
Bit time segment 1
Bit time segment 2
Resynchronization adjust width
Loop back mode
Listen-Only mode
https://github.com/cmsis-svd/cmsis-svd-data