i,m new in using stm microcontrollers. i,m using STML152 Nucleo board. i,m doing blinky project and i,ve seen several projects in which they taught us about configure system clock. So, when i,m making my project i can not find the lines for system clock in configure files. i,ve seen reference manual document of cortex m3 in books tab but i could not find detail of system clock.
Such things are specific to the particular chip - so you need to look to the chip documentation for details.
Look at examples provided by the chip manufacturer.
See also:
"System and Clock Configuration" at:
www.keil.com/.../group__system__init__gr.html
The part should come up and run under its default clock, likely HSI or MSI, you don't have to change those unless you want to configure maximal speed via the PLL or other sources.
Perhaps also look at the HAL examples under the CubeL1 package.
STM32Cube_FW_L1_V1.9.0\Projects\NUCLEO-L152RE\Examples\GPIO\GPIO_IOToggle
SystemClock_Config()