Hi：

Currently, I am using STM32C031. When debugging UART, it works normally when the optimization setting is set to 2 or 3, but fails to work when set to 0 or 1. Finally, it was found through checking the registers that the UART baud rate was not set effectively when optimization was set to 0 or 1, and the UART baud rate setting used an inline function. Can it be explained whether there is any correlation between optimization and inline, and why setting optimization would cause UART initialization to fail?