diff options
| author | Bruno Randolf <br1@einfach.org> | 2018-01-05 16:36:59 +0300 |
|---|---|---|
| committer | Karl Palsson <karlp@tweak.net.au> | 2019-06-03 01:18:05 +0300 |
| commit | b8424263e8e13a2c6a225a76f242f6af042dab73 (patch) | |
| tree | 312fa5f9564baaccb06c69cb6b84541744fe3642 | |
| parent | 2c1823f7bbae19f9322770e855555da08f8bcea8 (diff) | |
stm32:l4: rcc: Add RTC clock functions
| -rw-r--r-- | include/libopencm3/stm32/l4/rcc.h | 4 | ||||
| -rw-r--r-- | lib/stm32/l4/rcc.c | 36 |
2 files changed, 40 insertions, 0 deletions
diff --git a/include/libopencm3/stm32/l4/rcc.h b/include/libopencm3/stm32/l4/rcc.h index 01c34e26..8bad910b 100644 --- a/include/libopencm3/stm32/l4/rcc.h +++ b/include/libopencm3/stm32/l4/rcc.h @@ -964,6 +964,10 @@ void rcc_set_msi_range(uint32_t msi_range); void rcc_set_msi_range_standby(uint32_t msi_range); void rcc_pll_output_enable(uint32_t pllout); void rcc_set_clock48_source(uint32_t clksel); +void rcc_clock_setup_pll(const struct rcc_clock_scale *clock); +void rcc_enable_rtc_clock(void); +void rcc_disable_rtc_clock(void); +void rcc_set_rtc_clock_source(enum rcc_osc clk); END_DECLS diff --git a/lib/stm32/l4/rcc.c b/lib/stm32/l4/rcc.c index 86631254..f44cfca1 100644 --- a/lib/stm32/l4/rcc.c +++ b/lib/stm32/l4/rcc.c @@ -398,4 +398,40 @@ void rcc_set_clock48_source(uint32_t clksel) RCC_CCIPR |= (clksel << RCC_CCIPR_CLK48SEL_SHIFT); } + +/** Enable the RTC clock */ +void rcc_enable_rtc_clock(void) +{ + RCC_BDCR |= RCC_BDCR_RTCEN; +} + +/** Disable the RTC clock */ +void rcc_disable_rtc_clock(void) +{ + RCC_BDCR &= ~RCC_BDCR_RTCEN; +} + +/** Set the source for the RTC clock + * @param[in] clk ::rcc_osc. RTC clock source. Only HSE/32, LSE and LSI. + */ +void rcc_set_rtc_clock_source(enum rcc_osc clk) +{ + RCC_BDCR &= ~(RCC_BDCR_RTCSEL_MASK << RCC_BDCR_RTCSEL_SHIFT); + + switch (clk) { + case RCC_HSE: + RCC_BDCR |= (RCC_BDCR_RTCSEL_HSEDIV32 << RCC_BDCR_RTCSEL_SHIFT); + break; + case RCC_LSE: + RCC_BDCR |= (RCC_BDCR_RTCSEL_LSE << RCC_BDCR_RTCSEL_SHIFT); + break; + case RCC_LSI: + RCC_BDCR |= (RCC_BDCR_RTCSEL_LSI << RCC_BDCR_RTCSEL_SHIFT); + break; + default: + /* none selected */ + break; + } +} + /**@}*/ |