sdmmc-core 0.5.0

SD/MMC core data structures and algorithms
Documentation 
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use crate::lib_bitfield;
use crate::result::Result;

use super::{ExtCsd, ExtCsdIndex};

mod mode;
mod reset;
mod width;

pub use mode::*;
pub use reset::*;
pub use width::*;

lib_bitfield! {
    /// Represents the `BOOT_BUS_CONDITIONS` field of the [ExtCsd] register.
    BootBusConditions: u8,
    mask: 0x1f,
    default: 0,
    {
        /// Inidicates the mode settings during boot mode.
        boot_mode: BootMode, 4, 3;
        /// Inidicates the reset conditions during boot mode.
        reset_boot_bus_conditions: ResetBootBusConditions, 2;
        /// Indicates the bus width during boot mode.
        boot_bus_width: BootBusWidth, 1, 0;
    }
}

impl ExtCsd {
    /// Gets the `BOOT_BUS_CONDITIONS` field of the [ExtCsd] register.
    pub const fn boot_bus_conditions(&self) -> Result<BootBusConditions> {
        BootBusConditions::try_from_inner(self.0[ExtCsdIndex::BootBusConditions.into_inner()])
    }

    /// Sets the `BOOT_BUS_CONDITIONS` field of the [ExtCsd] register.
    pub fn set_boot_bus_conditions(&mut self, val: BootBusConditions) {
        self.0[ExtCsdIndex::BootBusConditions.into_inner()] = val.into_inner();
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_boot_bus_conditions() {
        let mut ext_csd = ExtCsd::new();

        assert_eq!(ext_csd.boot_bus_conditions(), Ok(BootBusConditions::new()));

        (0..u8::MAX).for_each(|raw_boot| {
            // set a potentially invalid BootBusConditions
            ext_csd.set_boot_bus_conditions(BootBusConditions(raw_boot));

            match BootBusConditions::try_from_inner(raw_boot) {
                Ok(boot) => assert_eq!(ext_csd.boot_bus_conditions(), Ok(boot)),
                Err(err) => assert_eq!(ext_csd.boot_bus_conditions(), Err(err)),
            }
        });
    }
}