34 lines
940 B
Rust
34 lines
940 B
Rust
use stm32_metapac::rcc::vals::Rtcsel;
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pub const BACKUP_REGISTER_COUNT: usize = 20;
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/// Unlock the backup domain
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pub(super) unsafe fn unlock_backup_domain(clock_config: u8) {
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crate::pac::PWR.cr1().modify(|w| w.set_dbp(true));
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while !crate::pac::PWR.cr1().read().dbp() {}
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let reg = crate::pac::RCC.bdcr().read();
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assert!(!reg.lsecsson(), "RTC is not compatible with LSE CSS, yet.");
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if !reg.rtcen() || reg.rtcsel().0 != clock_config {
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crate::pac::RCC.bdcr().modify(|w| w.set_bdrst(true));
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crate::pac::RCC.bdcr().modify(|w| {
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// Reset
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w.set_bdrst(false);
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// Select RTC source
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w.set_rtcsel(Rtcsel(clock_config));
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w.set_rtcen(true);
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w.set_lseon(reg.lseon());
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w.set_lsedrv(reg.lsedrv());
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w.set_lsebyp(reg.lsebyp());
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});
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}
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}
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pub(crate) unsafe fn enable_peripheral_clk() {
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// Nothing to do
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}
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