I'm using the STM32U5 and when I create a basic project in Keil and compile, I get the following error:"Error: L6218E: Undefined symbol SECURE_SystemCoreClockUpdate (referred from system_stm32u5xx_ns.o)."How to fix this?I don't want to use STM32Cube ...

Hi,I'm using the STM32L4R5AG MCU with 4MHz MSI clock.I want to use I2C in fast mode (400kHz).The PCLK for I2C is also 4MHz from the MSI directly (in my application, I don't want to use a PLL).In CubeMX for 4MHz PCLK, if I select fast mode, the TIMING...