esp-hal 1.2.0

Bare-metal HAL for Espressif devices
Documentation 
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use crate::{
    clock::{
        RtcClock,
        calibrate_rtc_fast_clock,
        calibrate_rtc_slow_clock,
        rtc_fast_cal_period,
        rtc_slow_cal_period,
    },
    rtc_cntl::sleep::PowerDownFlags,
};

#[derive(Clone, Copy)]
pub(super) struct SleepTimeConfig {
    pub sleep_time_adjustment: u32,
    pub slowclk_period: u32,
    pub fastclk_period: u32,
}

impl SleepTimeConfig {
    fn rtc_clk_cal_fast(deep: bool) -> u32 {
        if deep {
            calibrate_rtc_fast_clock();
        }

        rtc_fast_cal_period()
    }

    fn rtc_clk_cal_slow(deep: bool) -> u32 {
        if deep {
            calibrate_rtc_slow_clock();
        }

        rtc_slow_cal_period()
    }

    pub fn new(deep: bool) -> Self {
        Self {
            sleep_time_adjustment: 0,
            slowclk_period: Self::rtc_clk_cal_slow(deep),
            fastclk_period: Self::rtc_clk_cal_fast(deep),
        }
    }

    pub fn light_sleep(pd_flags: PowerDownFlags) -> Self {
        let mut this = Self::new(false);

        let sw = Self::LIGHT_SLEEP_TIME_OVERHEAD_US; // TODO
        let hw = this.pmu_sleep_calculate_hw_wait_time(pd_flags);

        this.sleep_time_adjustment = sw + hw;

        this
    }

    pub fn deep_sleep() -> Self {
        let mut this = Self::new(true);

        this.sleep_time_adjustment = 250 + 100 * 240 / Self::CONFIG_ESP_DEFAULT_CPU_FREQ_MHZ;

        this
    }

    pub fn us_to_slowclk(&self, us: u32) -> u32 {
        (us << RtcClock::CAL_FRACT) / self.slowclk_period
    }

    pub fn slowclk_to_us(&self, rtc_cycles: u32) -> u32 {
        (rtc_cycles * self.slowclk_period) >> RtcClock::CAL_FRACT
    }

    pub fn us_to_fastclk(&self, us: u32) -> u32 {
        (us << RtcClock::CAL_FRACT) / self.fastclk_period
    }
}