Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f0/STM32F0x2/CAN/CAN_TDL1R#0x0
CAN_TDL1R
DATA0
DATA1
DATA2
DATA3
https://github.com/modm-io/cmsis-svd-stm32