Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32l4/STM32L412/RCC/APB2ENR#0x0
APB2ENR
SYSCFG clock enable
Firewall clock enable
TIM1 timer clock enable
SPI1 clock enable
USART1clock enable
TIM15 timer clock enable
TIM16 timer clock enable
https://github.com/modm-io/cmsis-svd-stm32