Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f0/STM32F0x1/CAN/CAN_MSR#0x0
CAN_MSR
INAK
SLAK
ERRI
WKUI
SLAKI
TXM
RXM
SAMP
RX
https://github.com/modm-io/cmsis-svd-stm32