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stm32/f0: RTC clock helpers

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Add three more RTC clock helper functions:

- rcc_set_rtc_clock_source
  RTC on stm32/f0 can be clocked from the following three
  sources: LSI, LSE (32.768Hz), HSE/32.

- rcc_enable_rtc_clock
- rcc_disable_rtc_clock
  enable/disable clocking RTC module using selected clock source

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
This commit is contained in:
Sergey Matyukevich 2017-01-02 23:32:24 +03:00 committed by Karl Palsson
parent d2540e5fc6
commit 43736cf03f
2 changed files with 47 additions and 0 deletions
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3
include/libopencm3/stm32/f0/rcc.h
View File

@ -509,6 +509,9 @@ void rcc_css_int_clear(void);
int rcc_css_int_flag(void);
void rcc_set_sysclk_source(enum rcc_osc clk);
void rcc_set_usbclk_source(enum rcc_osc clk);
void rcc_set_rtc_clock_source(enum rcc_osc clk);
void rcc_enable_rtc_clock(void);
void rcc_disable_rtc_clock(void);
void rcc_set_pll_multiplication_factor(uint32_t mul);
void rcc_set_ppre(uint32_t ppre);
void rcc_set_hpre(uint32_t hpre);

44
lib/stm32/f0/rcc.c
View File

@ -438,6 +438,50 @@ void rcc_set_usbclk_source(enum rcc_osc clk)
}
}
/*---------------------------------------------------------------------------*/
/** @brief RCC Enable the RTC clock
*/
void rcc_enable_rtc_clock(void)
{
RCC_BDCR |= RCC_BDCR_RTCEN;
}
/*---------------------------------------------------------------------------*/
/** @brief RCC Disable the RTC clock
*/
void rcc_disable_rtc_clock(void)
{
RCC_BDCR &= ~RCC_BDCR_RTCEN;
}
/*---------------------------------------------------------------------------*/
/** @brief RCC Set the Source for the RTC clock
@param[in] clock_source ::rcc_osc. RTC clock source. Only HSE/32, LSE and LSI.
*/
void rcc_set_rtc_clock_source(enum rcc_osc clk)
{
switch (clk) {
case RCC_HSE:
RCC_BDCR = (RCC_BDCR & ~RCC_BDCR_RTCSEL) | RCC_BDCR_RTCSEL_HSE;
break;
case RCC_LSE:
RCC_BDCR = (RCC_BDCR & ~RCC_BDCR_RTCSEL) | RCC_BDCR_RTCSEL_LSE;
break;
case RCC_LSI:
RCC_BDCR = (RCC_BDCR & ~RCC_BDCR_RTCSEL) | RCC_BDCR_RTCSEL_LSI;
break;
default:
/* do nothing */
break;
}
}
/*---------------------------------------------------------------------------*/
/** @brief RCC Set the PLL Multiplication Factor.
*