esp_hal/rtc_cntl/sleep/

esp32c2.rs

use super::SleepKind;
use crate::{
    peripherals::{APB_CTRL, BB, EXTMEM, LPWR, SPI0, SPI1, SYSTEM},
    rtc_cntl::Rtc,
    soc::regi2c,
};

// Approximate mapping of voltages to RTC_CNTL_DBIAS_WAK, RTC_CNTL_DBIAS_SLP,
// RTC_CNTL_DIG_DBIAS_WAK, RTC_CNTL_DIG_DBIAS_SLP values.
// Valid if RTC_CNTL_DBG_ATTEN is 0.
/// Digital bias voltage level of 0.90V.
pub const RTC_CNTL_DBIAS_0V90: u8 = 13;
/// Digital bias voltage level of 0.95V.
pub const RTC_CNTL_DBIAS_0V95: u8 = 16;
/// Digital bias voltage level of 1.00V.
pub const RTC_CNTL_DBIAS_1V00: u8 = 18;
/// Digital bias voltage level of 1.05V.
pub const RTC_CNTL_DBIAS_1V05: u8 = 20;
/// Digital bias voltage level of 1.10V.
pub const RTC_CNTL_DBIAS_1V10: u8 = 23;
/// Digital bias voltage level of 1.15V.
pub const RTC_CNTL_DBIAS_1V15: u8 = 25;
/// Digital bias voltage level of 1.20V.
pub const RTC_CNTL_DBIAS_1V20: u8 = 28;
/// Digital bias voltage level of 1.25V.
pub const RTC_CNTL_DBIAS_1V25: u8 = 30;
/// Digital bias voltage level of approximately 1.34V.
pub const RTC_CNTL_DBIAS_1V30: u8 = 31;

/// Default attenuation setting during light sleep, with a voltage drop.
pub const RTC_CNTL_DBG_ATTEN_LIGHTSLEEP_DEFAULT: u8 = 5;
/// No attenuation (no voltage drop) during light sleep.
pub const RTC_CNTL_DBG_ATTEN_LIGHTSLEEP_NODROP: u8 = 0;
/// Default attenuation setting during deep sleep, with maximum voltage drop.
pub const RTC_CNTL_DBG_ATTEN_DEEPSLEEP_DEFAULT: u8 = 15;
/// No attenuation (no voltage drop) during deep sleep.
pub const RTC_CNTL_DBG_ATTEN_DEEPSLEEP_NODROP: u8 = 0;

/// Default bias setting during sleep mode.
pub const RTC_CNTL_BIASSLP_SLEEP_DEFAULT: u8 = 1;
/// Keeps the bias for ultra-low power sleep mode always on.
pub const RTC_CNTL_BIASSLP_SLEEP_ON: u8 = 0;

/// Default power-down current setting during sleep mode.
pub const RTC_CNTL_PD_CUR_SLEEP_DEFAULT: u8 = 1;
/// Keeps the power-down current setting for sleep mode always on.
pub const RTC_CNTL_PD_CUR_SLEEP_ON: u8 = 0;

/// Default driver bias setting for the digital domain during sleep mode.
pub const RTC_CNTL_DG_VDD_DRV_B_SLP_DEFAULT: u8 = 254;

/// Default debug attenuation setting for the monitor mode.
pub const RTC_CNTL_DBG_ATTEN_MONITOR_DEFAULT: u8 = 0;
/// Default bias setting for sleep mode in the monitor mode.
pub const RTC_CNTL_BIASSLP_MONITOR_DEFAULT: bool = false;
/// Default power-down current setting for the monitor mode.
pub const RTC_CNTL_PD_CUR_MONITOR_DEFAULT: bool = false;

/// Default number of cycles to wait for the PLL buffer to stabilize.
pub const RTC_CNTL_PLL_BUF_WAIT_DEFAULT: u8 = 20;
/// Default number of cycles to wait for the XTL buffer to stabilize.
pub const RTC_CNTL_XTL_BUF_WAIT_DEFAULT: u8 = 100;
/// Default number of cycles to wait for the internal 8MHz clock to stabilize.
pub const RTC_CNTL_CK8M_WAIT_DEFAULT: u8 = 20;
/// Default number of cycles required to enable the internal 8MHz clock.
pub const RTC_CK8M_ENABLE_WAIT_DEFAULT: u8 = 5;

/// Minimum number of cycles for sleep duration.
pub const RTC_CNTL_MIN_SLP_VAL_MIN: u8 = 2;

/// Power-up cycles for other hardware blocks.
pub const OTHER_BLOCKS_POWERUP: u8 = 1;
/// Wait cycles for other hardware blocks to stabilize.
pub const OTHER_BLOCKS_WAIT: u16 = 1;

/// Disables GPIO interrupt.
pub const GPIO_INTR_DISABLE: u8 = 0;
/// Sets GPIO interrupt to trigger on a low level signal.
pub const GPIO_INTR_LOW_LEVEL: u8 = 4;
/// Sets GPIO interrupt to trigger on a high level signal.
pub const GPIO_INTR_HIGH_LEVEL: u8 = 5;

/// Specifies the function configuration for GPIO pins.
pub const PIN_FUNC_GPIO: u8 = 1;
/// Index for signaling GPIO output.
pub const SIG_GPIO_OUT_IDX: u32 = 128;
/// Maximum number of GPIO pins supported.
pub const GPIO_NUM_MAX: usize = 22;

bitfield::bitfield! {
    #[derive(Clone, Copy)]
    /// RTC Configuration.
    pub struct RtcConfig(u32);
    impl Debug;
    /// Number of rtc_fast_clk cycles to wait for 8M clock to be ready
    pub u8, ck8m_wait, set_ck8m_wait: 7, 0;
    /// Number of rtc_fast_clk cycles to wait for XTAL clock to be ready
    pub u8, xtal_wait, set_xtal_wait: 15, 8;
    /// Number of rtc_fast_clk cycles to wait for PLL clock to be ready
    pub u8, pll_wait, set_pll_wait: 23, 16;
    /// Perform clock control related initialization.
    pub clkctl_init, set_clkctl_init: 24;
    /// Perform power control related initialization.
    pub pwrctl_init, set_pwrctl_init: 25;
    /// Force power down RTC_DBOOST
    pub rtc_dboost_fpd, set_rtc_dboost_fpd: 26;
    /// Keep the XTAL oscillator powered up in sleep.
    pub xtal_fpu, set_xtal_fpu: 27;
    /// Keep the BBPLL oscillator powered up in sleep.
    pub bbpll_fpu, set_bbpll_fpu: 28;
    /// Enable clock gating when the CPU is in wait-for-interrupt state.
    pub cpu_waiti_clk_gate, set_cpu_waiti_clk_gate: 29;
    /// Calibrate Ocode to make bandgap voltage more precise.
    pub cali_ocode, set_cali_ocode: 30;
}

impl Default for RtcConfig {
    fn default() -> Self {
        let mut cfg = Self(Default::default());
        cfg.set_ck8m_wait(RTC_CNTL_CK8M_WAIT_DEFAULT);
        cfg.set_xtal_wait(RTC_CNTL_XTL_BUF_WAIT_DEFAULT);
        cfg.set_pll_wait(RTC_CNTL_PLL_BUF_WAIT_DEFAULT);
        cfg.set_clkctl_init(true);
        cfg.set_pwrctl_init(true);
        cfg.set_rtc_dboost_fpd(true);
        cfg.set_cpu_waiti_clk_gate(true);
        cfg.set_bbpll_fpu(true);
        cfg
    }
}

bitfield::bitfield! {
    #[derive(Clone, Copy)]
    /// Configuration for RTC initialization.
    pub struct RtcInitConfig(u128);
    impl Debug;
    /// Number of cycles required to power up WiFi
    pub u8, wifi_powerup_cycles, set_wifi_powerup_cycles: 6, 0;
    /// Number of wait cycles for WiFi to stabilize
    pub u16, wifi_wait_cycles, set_wifi_wait_cycles: 15, 7;
    /// Number of cycles required to power up Bluetooth
    pub u8, bt_powerup_cycles, set_bt_powerup_cycles: 22, 16;
    /// Number of wait cycles for Bluetooth to stabilize
    pub u16, bt_wait_cycles, set_bt_wait_cycles: 31, 23;
    /// Number of cycles required to power up the top CPU
    pub u8, cpu_top_powerup_cycles, set_cpu_top_powerup_cycles: 38, 32;
    /// Number of wait cycles for the top CPU to stabilize
    pub u16, cpu_top_wait_cycles, set_cpu_top_wait_cycles: 47, 39;
    /// Number of cycles required to power up the digital wrapper
    pub u8, dg_wrap_powerup_cycles, set_dg_wrap_powerup_cycles: 54, 48;
    /// Number of wait cycles for the digital wrapper to stabilize
    pub u16, dg_wrap_wait_cycles, set_dg_wrap_wait_cycles: 63, 55;
    /// Number of cycles required to power up the digital peripherals
    pub u8, dg_peri_powerup_cycles, set_dg_peri_powerup_cycles: 70, 64;
    /// Number of wait cycles for the digital peripherals to stabilize
    pub u16, dg_peri_wait_cycles, set_dg_peri_wait_cycles: 79, 71;
}

impl Default for RtcInitConfig {
    fn default() -> Self {
        let mut cfg = Self(Default::default());
        cfg.set_wifi_powerup_cycles(OTHER_BLOCKS_POWERUP);
        cfg.set_bt_powerup_cycles(OTHER_BLOCKS_POWERUP);
        cfg.set_cpu_top_powerup_cycles(OTHER_BLOCKS_POWERUP);
        cfg.set_dg_wrap_powerup_cycles(OTHER_BLOCKS_POWERUP);
        cfg.set_dg_peri_powerup_cycles(OTHER_BLOCKS_POWERUP);
        cfg.set_wifi_wait_cycles(OTHER_BLOCKS_WAIT);
        cfg.set_bt_wait_cycles(OTHER_BLOCKS_WAIT);
        cfg.set_cpu_top_wait_cycles(OTHER_BLOCKS_WAIT);
        cfg.set_dg_wrap_wait_cycles(OTHER_BLOCKS_WAIT);
        cfg.set_dg_peri_wait_cycles(OTHER_BLOCKS_WAIT);
        cfg
    }
}

bitfield::bitfield! {
    #[derive(Clone, Copy)]
    /// Configuration for RTC sleep mode.
    pub struct RtcSleepConfig(u64);
    impl Debug;
    /// force normal voltage in sleep mode (digital domain memory)
    pub lslp_mem_inf_fpu, set_lslp_mem_inf_fpu: 0;
    /// keep low voltage in sleep mode (even if ULP/touch is used)
    pub rtc_mem_inf_follow_cpu, set_rtc_mem_inf_follow_cpu: 1;
    /// power down RTC fast memory
    pub rtc_fastmem_pd_en, set_rtc_fastmem_pd_en: 2;
    /// power down RTC slow memory
    pub rtc_slowmem_pd_en, set_rtc_slowmem_pd_en: 3;
    /// power down RTC peripherals
    pub rtc_peri_pd_en, set_rtc_peri_pd_en: 4;
    /// power down WiFi
    pub wifi_pd_en, set_wifi_pd_en: 5;
    /// power down BT
    pub bt_pd_en, set_bt_pd_en: 6;
    /// power down CPU, but not restart when lightsleep.
    pub cpu_pd_en, set_cpu_pd_en: 7;
    /// Power down Internal 8M oscillator
    pub int_8m_pd_en, set_int_8m_pd_en: 8;
    /// power down digital peripherals
    pub dig_peri_pd_en, set_dig_peri_pd_en: 9;
    /// power down digital domain
    pub deep_slp, set_deep_slp: 10;
    /// enable WDT flashboot mode
    pub wdt_flashboot_mod_en, set_wdt_flashboot_mod_en: 11;
    /// set bias for digital domain, in sleep mode
    pub u8, dig_dbias_slp, set_dig_dbias_slp: 16, 12;
    /// set bias for RTC domain, in sleep mode
    pub u8, rtc_dbias_slp, set_rtc_dbias_slp: 21, 17;
    /// voltage parameter, in sleep mode
    pub u8, dbg_atten_slp, set_dbg_atten_slp: 25, 22;
    /// circuit control parameter, in monitor mode
    pub bias_sleep_monitor, set_bias_sleep_monitor: 26;
    /// circuit control parameter, in sleep mode
    pub bias_sleep_slp, set_bias_sleep_slp: 27;
    /// circuit control parameter, in monitor mode
    pub pd_cur_slp, set_pd_cur_slp: 28;
    /// power down VDDSDIO regulator
    pub vddsdio_pd_en, set_vddsdio_pd_en: 29;
    /// keep main XTAL powered up in sleep
    pub xtal_fpu, set_xtal_fpu: 30;
    /// keep rtc regulator powered up in sleep
    pub rtc_regulator_fpu, set_rtc_regulator_fpu: 31;
    /// enable deep sleep reject
    pub deep_slp_reject, set_deep_slp_reject: 32;
    /// enable light sleep reject
    pub light_slp_reject, set_light_slp_reject: 33;
}

impl Default for RtcSleepConfig {
    fn default() -> Self {
        let mut cfg = Self(Default::default());
        cfg.set_deep_slp_reject(true);
        cfg.set_light_slp_reject(true);
        cfg.set_rtc_dbias_slp(RTC_CNTL_DBIAS_1V10);
        cfg.set_dig_dbias_slp(RTC_CNTL_DBIAS_1V10);

        // This is the light-sleep config. The main XTAL is powered down in sleep
        // (`xtal_fpu` stays false), so the analog regulator/bias must use the
        // same XTAL-down settings that `deep()` applies "because of xtal_fpu".
        cfg.set_rtc_regulator_fpu(true);
        cfg.set_bias_sleep_monitor(true);
        cfg.set_bias_sleep_slp(true);
        cfg.set_pd_cur_slp(true);
        cfg
    }
}

const DR_REG_NRX_BASE: u32 = 0x6001CC00;
const DR_REG_FE_BASE: u32 = 0x60006000;
const DR_REG_FE2_BASE: u32 = 0x60005000;

const NRXPD_CTRL: u32 = DR_REG_NRX_BASE + 0x00d4;
const FE_GEN_CTRL: u32 = DR_REG_FE_BASE + 0x0090;
const FE2_TX_INTERP_CTRL: u32 = DR_REG_FE2_BASE + 0x00f0;

const SYSCON_SRAM_POWER_UP: u8 = 0x0000000F;
const SYSCON_ROM_POWER_UP: u8 = 0x00000003;

const NRX_RX_ROT_FORCE_PU: u32 = 1 << 5;
const NRX_VIT_FORCE_PU: u32 = 1 << 3;
const NRX_DEMAP_FORCE_PU: u32 = 1 << 1;

const FE_IQ_EST_FORCE_PU: u32 = 1 << 5;
const FE2_TX_INF_FORCE_PU: u32 = 1 << 10;

fn modify_register(reg: u32, mask: u32, value: u32) {
    let reg = reg as *mut u32;

    unsafe { reg.write_volatile((reg.read_volatile() & !mask) | value) };
}

fn register_modify_bits(reg: u32, bits: u32, set: bool) {
    if set {
        modify_register(reg, bits, bits);
    } else {
        modify_register(reg, bits, 0);
    }
}

fn rtc_sleep_pu(val: bool) {
    LPWR::regs()
        .dig_pwc()
        .modify(|_, w| w.lslp_mem_force_pu().bit(val));

    APB_CTRL::regs().front_end_mem_pd().modify(|_r, w| {
        w.dc_mem_force_pu().bit(val);
        w.pbus_mem_force_pu().bit(val);
        w.agc_mem_force_pu().bit(val)
    });

    BB::regs()
        .bbpd_ctrl()
        .modify(|_r, w| w.fft_force_pu().bit(val).dc_est_force_pu().bit(val));

    register_modify_bits(
        NRXPD_CTRL,
        NRX_RX_ROT_FORCE_PU | NRX_VIT_FORCE_PU | NRX_DEMAP_FORCE_PU,
        val,
    );

    register_modify_bits(FE_GEN_CTRL, FE_IQ_EST_FORCE_PU, val);

    register_modify_bits(FE2_TX_INTERP_CTRL, FE2_TX_INF_FORCE_PU, val);

    APB_CTRL::regs().mem_power_up().modify(|_r, w| unsafe {
        w.sram_power_up()
            .bits(if val { SYSCON_SRAM_POWER_UP } else { 0 });
        w.rom_power_up()
            .bits(if val { SYSCON_ROM_POWER_UP } else { 0 })
    });
}

impl RtcSleepConfig {
    /// Configures the RTC for deep sleep mode.
    pub fn deep() -> Self {
        // Set up for ultra-low power sleep. Wakeup sources may modify these settings.
        let mut cfg = Self::default();

        cfg.set_lslp_mem_inf_fpu(false);
        cfg.set_rtc_mem_inf_follow_cpu(true); // ?
        cfg.set_rtc_fastmem_pd_en(true);
        cfg.set_rtc_slowmem_pd_en(true);
        cfg.set_rtc_peri_pd_en(true);
        cfg.set_wifi_pd_en(true);
        cfg.set_bt_pd_en(true);
        cfg.set_cpu_pd_en(true);
        cfg.set_int_8m_pd_en(true);

        cfg.set_dig_peri_pd_en(true);
        cfg.set_dig_dbias_slp(0); // because of dig_peri_pd_en

        cfg.set_deep_slp(true);
        cfg.set_wdt_flashboot_mod_en(false);
        cfg.set_vddsdio_pd_en(true);
        cfg.set_xtal_fpu(false);
        cfg.set_deep_slp_reject(true);
        cfg.set_light_slp_reject(true);
        cfg.set_rtc_dbias_slp(RTC_CNTL_DBIAS_1V10);

        // because of dig_peri_pd_en
        cfg.set_rtc_regulator_fpu(false);
        cfg.set_dbg_atten_slp(RTC_CNTL_DBG_ATTEN_DEEPSLEEP_DEFAULT);

        // because of xtal_fpu
        cfg.set_bias_sleep_monitor(true);
        cfg.set_bias_sleep_slp(true);
        cfg.set_pd_cur_slp(true);

        cfg
    }

    pub(crate) fn is_deep_sleep(&self) -> bool {
        self.deep_slp()
    }

    pub(crate) fn set_sleep_kind(&mut self, kind: SleepKind) {
        self.set_deep_slp(kind == SleepKind::Deep);
    }

    pub(crate) fn base_settings(_rtc: &Rtc<'_>) {
        let cfg = RtcConfig::default();

        // settings derived from esp_clk_init -> rtc_init
        let rtc_cntl = LPWR::regs();
        let extmem = EXTMEM::regs();
        let system = SYSTEM::regs();

        regi2c::I2C_DIG_REG_XPD_RTC_REG.write_field(0);
        regi2c::I2C_DIG_REG_XPD_DIG_REG.write_field(0);

        unsafe {
            rtc_cntl.timer1().modify(|_, w| {
                w.pll_buf_wait().bits(cfg.pll_wait());
                w.ck8m_wait().bits(cfg.ck8m_wait())
            });

            // Moved from rtc sleep to rtc init to save sleep function running time
            // set shortest possible sleep time limit

            rtc_cntl
                .timer5()
                .modify(|_, w| w.min_slp_val().bits(RTC_CNTL_MIN_SLP_VAL_MIN));

            // TODO: something about cali_ocode

            // Reset RTC bias to default value (needed if waking up from deep sleep)
            regi2c::I2C_DIG_REG_EXT_RTC_DREG_SLEEP.write_field(RTC_CNTL_DBIAS_1V10);

            // LDO dbias initialization
            // TODO: this modifies g_rtc_dbias_pvt_non_240m and g_dig_dbias_pvt_non_240m.
            //       We're using a high enough default but we should read from the efuse.
            // set_rtc_dig_dbias();

            regi2c::I2C_DIG_REG_EXT_RTC_DREG.write_field(RTC_CNTL_DBIAS_1V25);
            regi2c::I2C_DIG_REG_EXT_DIG_DREG.write_field(RTC_CNTL_DBIAS_1V25);

            if cfg.clkctl_init() {
                // clear CMMU clock force on

                extmem
                    .cache_mmu_power_ctrl()
                    .modify(|_, w| w.cache_mmu_mem_force_on().clear_bit());
                // clear tag clock force on

                extmem
                    .icache_tag_power_ctrl()
                    .modify(|_, w| w.icache_tag_mem_force_on().clear_bit());

                // clear register clock force on
                SPI0::regs()
                    .clock_gate()
                    .modify(|_, w| w.clk_en().clear_bit());
                SPI1::regs()
                    .clock_gate()
                    .modify(|_, w| w.clk_en().clear_bit());
            }

            if cfg.pwrctl_init() {
                rtc_cntl
                    .clk_conf()
                    .modify(|_, w| w.ck8m_force_pu().clear_bit());

                rtc_cntl
                    .options0()
                    .modify(|_, w| w.xtl_force_pu().bit(cfg.xtal_fpu() || cfg.bbpll_fpu()));

                // cancel bbpll force pu if setting no force power up

                rtc_cntl.options0().modify(|_, w| {
                    w.bbpll_force_pu().bit(cfg.bbpll_fpu());
                    w.bbpll_i2c_force_pu().bit(cfg.bbpll_fpu());
                    w.bb_i2c_force_pu().bit(cfg.bbpll_fpu())
                });

                rtc_cntl
                    .rtc_cntl()
                    .modify(|_, w| w.regulator_force_pu().clear_bit());

                // If this mask is enabled, all soc memories cannot enter power down mode
                // We should control soc memory power down mode from RTC, so we will not touch
                // this register any more

                system
                    .mem_pd_mask()
                    .modify(|_, w| w.lslp_mem_pd_mask().clear_bit());

                // If this pd_cfg is set to 1, all memory won't enter low power mode during
                // light sleep If this pd_cfg is set to 0, all memory will enter low
                // power mode during light sleep
                rtc_sleep_pu(false);

                rtc_cntl
                    .dig_pwc()
                    .modify(|_, w| w.dg_wrap_force_pu().clear_bit());

                rtc_cntl
                    .dig_iso()
                    .modify(|_, w| w.dg_wrap_force_noiso().clear_bit());

                // if SYSTEM_CPU_WAIT_MODE_FORCE_ON == 0 , the cpu clk will be closed when cpu
                // enter WAITI mode

                system
                    .cpu_per_conf()
                    .modify(|_, w| w.cpu_wait_mode_force_on().bit(!cfg.cpu_waiti_clk_gate()));

                // cancel digital PADS force no iso

                rtc_cntl.dig_iso().modify(|_, w| {
                    w.dg_pad_force_unhold().clear_bit();
                    w.dg_pad_force_noiso().clear_bit()
                });
            }

            rtc_cntl.int_ena().write(|w| w.bits(0));
            rtc_cntl.int_clr().write(|w| w.bits(u32::MAX));

            regi2c::I2C_ULP_IR_FORCE_XPD_CK.write_field(1);
        }
    }

    pub(crate) fn apply(&self) {
        // like esp-idf rtc_sleep_init()
        let rtc_cntl = LPWR::regs();

        if self.lslp_mem_inf_fpu() {
            rtc_sleep_pu(true);
        }

        unsafe {
            assert!(!self.pd_cur_slp() || self.bias_sleep_slp());

            regi2c::I2C_DIG_REG_EXT_RTC_DREG_SLEEP.write_field(self.rtc_dbias_slp());
            regi2c::I2C_DIG_REG_EXT_DIG_DREG_SLEEP.write_field(self.dig_dbias_slp());

            rtc_cntl.bias_conf().modify(|_, w| {
                w.dbg_atten_monitor()
                    .bits(RTC_CNTL_DBG_ATTEN_MONITOR_DEFAULT);
                // We have config values for this in self, so I don't know why we're setting
                // hardcoded defaults for these next two. It's what IDF does...
                w.bias_sleep_monitor().bit(RTC_CNTL_BIASSLP_MONITOR_DEFAULT);
                w.pd_cur_monitor().bit(RTC_CNTL_PD_CUR_MONITOR_DEFAULT)
            });

            rtc_cntl.bias_conf().modify(|_, w| {
                w.dbg_atten_deep_slp().bits(self.dbg_atten_slp());
                w.bias_sleep_deep_slp().bit(self.bias_sleep_slp());
                w.pd_cur_deep_slp().bit(self.pd_cur_slp())
            });

            if self.deep_slp() {
                regi2c::I2C_ULP_IR_FORCE_XPD_CK.write_field(0);

                rtc_cntl
                    .dig_pwc()
                    .modify(|_, w| w.dg_wrap_pd_en().set_bit());

                rtc_cntl.ana_conf().modify(|_, w| {
                    w.ckgen_i2c_pu().clear_bit();
                    w.pll_i2c_pu().clear_bit();
                    w.rfrx_pbus_pu().clear_bit();
                    w.txrf_i2c_pu().clear_bit()
                });

                rtc_cntl
                    .options0()
                    .modify(|_, w| w.bb_i2c_force_pu().clear_bit());
            } else {
                rtc_cntl.bias_conf().modify(|_, w| {
                    w.dg_vdd_drv_b_slp_en().set_bit();
                    w.dg_vdd_drv_b_slp().bits(RTC_CNTL_DG_VDD_DRV_B_SLP_DEFAULT)
                });

                rtc_cntl
                    .dig_pwc()
                    .modify(|_, w| w.dg_wrap_pd_en().clear_bit());
            }

            rtc_cntl
                .rtc_cntl()
                .modify(|_, w| w.regulator_force_pu().bit(self.rtc_regulator_fpu()));

            rtc_cntl.clk_conf().modify(|_, w| {
                w.ck8m_force_pu().bit(!self.int_8m_pd_en());
                w.ck8m_force_nogating().bit(!self.int_8m_pd_en())
            });

            // enable VDDSDIO control by state machine

            rtc_cntl.dig_pwc().modify(|_, w| {
                w.vdd_spi_pwr_force().clear_bit();
                w.vdd_spi_pd_en().bit(self.vddsdio_pd_en())
            });

            rtc_cntl.slp_reject_conf().modify(|_, w| {
                w.deep_slp_reject_en().bit(self.deep_slp_reject());
                w.light_slp_reject_en().bit(self.light_slp_reject())
            });

            rtc_cntl
                .options0()
                .modify(|_, w| w.xtl_force_pu().bit(self.xtal_fpu()));

            rtc_cntl
                .clk_conf()
                .modify(|_, w| w.xtal_global_force_nogating().bit(self.xtal_fpu()));
        }
    }

    /// Configures the wakeup options and requests the sleep.
    ///
    /// The caller waits for the result of the request.
    pub(crate) fn start_sleep(&self, wakeup_mask: u32, reject_mask: u32) {
        // set bits for what can wake us up
        LPWR::regs()
            .wakeup_state()
            .modify(|_, w| unsafe { w.wakeup_ena().bits(wakeup_mask) });

        // Set the bits of the sources that reject the sleep. The reject enables that `apply` wrote
        // arm those sources.
        LPWR::regs()
            .slp_reject_conf()
            .modify(|_, w| unsafe { w.sleep_reject_ena().bits(reject_mask) });

        LPWR::regs().state0().modify(|_, w| w.sleep_en().set_bit());
    }

    pub(crate) fn finish_sleep(&self) {
        // In deep sleep mode, we never get here

        LPWR::regs().int_clr().write(|w| {
            w.slp_reject().clear_bit_by_one();
            w.slp_wakeup().clear_bit_by_one()
        });

        // restore config if it is a light sleep
        if self.lslp_mem_inf_fpu() {
            rtc_sleep_pu(true);
        }
    }
}