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stm32: stm32f401 pll_freq updates 

Signed-off-by: Arkadiusz Raj <arek.raj@gmail.com>
This commit is contained in:
Arkadiusz Raj 2021-02-19 16:42:27 +00:00 committed by Kevin O'Connor
parent 28e41806f5
commit 90ffa0685f
1 changed files with 3 additions and 2 deletions
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5
src/stm32/stm32f4.c
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@ -146,7 +146,8 @@ enable_clock_stm32f40x(void)
#if CONFIG_MACH_STM32F405 || CONFIG_MACH_STM32F407 \
|| CONFIG_MACH_STM32F401 || CONFIG_MACH_STM32F429
uint32_t pll_base = (CONFIG_STM32_CLOCK_REF_25M) ? 1000000 : 2000000;
uint32_t pll_freq = CONFIG_CLOCK_FREQ * 2, pllcfgr;
uint32_t pllp = (CONFIG_MACH_STM32F401) ? 4 : 2;
uint32_t pll_freq = CONFIG_CLOCK_FREQ * pllp, pllcfgr;
if (!CONFIG_STM32_CLOCK_REF_INTERNAL) {
// Configure 168Mhz PLL from external crystal (HSE)
uint32_t div = CONFIG_CLOCK_REF_FREQ / pll_base;
@ -158,7 +159,7 @@ enable_clock_stm32f40x(void)
pllcfgr = RCC_PLLCFGR_PLLSRC_HSI | (div << RCC_PLLCFGR_PLLM_Pos);
}
RCC->PLLCFGR = (pllcfgr | ((pll_freq/pll_base) << RCC_PLLCFGR_PLLN_Pos)
| (0 << RCC_PLLCFGR_PLLP_Pos)
| (((pllp >> 1) - 1) << RCC_PLLCFGR_PLLP_Pos)
| ((pll_freq/FREQ_USB) << RCC_PLLCFGR_PLLQ_Pos));
RCC->CR |= RCC_CR_PLLON;
#endif