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stm32/h7: Implemented support for enabling the RTC clock source and peripheral

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This commit is contained in:
dragonmux
2024-05-13 23:47:10 +01:00
committed by Piotr Esden-Tempski
parent bf7929b723
commit 2a6059540d
2 changed files with 22 additions and 0 deletions
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9
include/libopencm3/stm32/h7/rcc.h
View File

@@ -843,6 +843,15 @@ uint32_t rcc_get_fdcan_clk_freq(uint32_t fdcan);
*/
void rcc_set_peripheral_clk_sel(uint32_t periph, uint32_t clksel);
/**
* Set the clksel value for the RTC and bring it up
*
* NB: This function may only be called on real POR or after BDRST, it will
* internally turn into a no-op if it detects the RTC clock source has already
* been defined to protect from misconfiguration
*/
void rcc_rtc_clock_enable(uint32_t clksel);
/**
* Set the clock select for the FDCAN devices.
* @param[in] clksel Clock source to configure for, @ref rcc_d2ccip1r_values

13
lib/stm32/h7/rcc.c
View File

@@ -448,6 +448,19 @@ void rcc_set_peripheral_clk_sel(uint32_t periph, uint32_t sel)
*reg = regval;
}
void rcc_rtc_clock_enable(uint32_t clksel)
{
// Make this function a no-op if the RTC has already been set up
if (RCC_BDCR & (RCC_BDCR_RTCSEL_MASK << RCC_BDCR_RTCSEL_SHIFT))
return;
// Start operations by disabling the write protections for the BDCR
PWR_CR1 |= PWR_CR1_DBP;
// Now configure the clock bits and bring the RTC up
RCC_BDCR |= (clksel << RCC_BDCR_RTCSEL_SHIFT) | RCC_BDCR_RTCEN;
// Protect the BDCR again as we don't need to poke it further
PWR_CR1 &= ~PWR_CR1_DBP;
}
void rcc_set_fdcan_clksel(uint8_t clksel)
{
RCC_D2CCIP1R &= ~(RCC_D2CCIP1R_FDCANSEL_MASK << RCC_D2CCIP1R_FDCANSEL_SHIFT);