diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32f40xxx_rcc.c')
| -rw-r--r-- | nuttx/arch/arm/src/stm32/stm32f40xxx_rcc.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32f40xxx_rcc.c b/nuttx/arch/arm/src/stm32/stm32f40xxx_rcc.c index 82757c43f..4eef64801 100644 --- a/nuttx/arch/arm/src/stm32/stm32f40xxx_rcc.c +++ b/nuttx/arch/arm/src/stm32/stm32f40xxx_rcc.c @@ -651,6 +651,15 @@ static void stm32_stdclockconfig(void) regval |= STM32_RCC_CFGR_PPRE1; putreg32(regval, STM32_RCC_CFGR); +#ifdef CONFIG_RTC_HSECLOCK + /* Set the RTC clock divisor */ + + regval = getreg32(STM32_RCC_CFGR); + regval &= ~RCC_CFGR_RTCPRE_MASK; + regval |= RCC_CFGR_RTCPRE(24); /* Assume 24MHz ext clock */ + putreg32(regval, STM32_RCC_CFGR); +#endif + /* Set the PLL dividers and multiplers to configure the main PLL */ regval = (STM32_PLLCFG_PLLM | STM32_PLLCFG_PLLN |STM32_PLLCFG_PLLP | |