- add brief descriptions for HSI clock functions - use rcc_set_pll_source to set PLL source in RCC_CFGR Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
- add brief descriptions for HSI clock functions - use rcc_set_pll_source to set PLL source in RCC_CFGR Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>