sdmmc-core 0.5.0

SD/MMC core data structures and algorithms
Documentation 
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use crate::result::Result;
use crate::{RangeU8, lib_bitfield};

use super::{ExtCsd, ExtCsdIndex};

/// Represents the `ERASED_MEMORY_RANGE` sub-field of the `ERASED_MEM_CONT` field.
pub type ErasedMemoryRange = RangeU8<0, 1>;

lib_bitfield! {
    /// Represents the `ERASED_MEM_CONT` field of the [ExtCsd] register.
    ErasedMemoryContent: u8,
    mask: 0b1,
    default: 0,
    {
        /// Represents the range of explicitly erased memory.
        erased_memory_range: ErasedMemoryRange, 7, 0;
    }
}

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

    /// Sets the `ERASED_MEM_CONT` field of the [ExtCsd] register.
    pub(crate) fn set_erased_mem_cont(&mut self, val: ErasedMemoryContent) {
        self.0[ExtCsdIndex::ErasedMemCont.into_inner()] = val.into_inner();
    }
}

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

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

        assert_eq!(ext_csd.erased_mem_cont(), Ok(ErasedMemoryContent::new()));

        (0..=u8::MAX).for_each(|raw_mem| {
            // set a potentially invalid ErasedMemoryContent
            ext_csd.set_erased_mem_cont(ErasedMemoryContent(raw_mem));

            match ErasedMemoryContent::try_from_inner(raw_mem) {
                Ok(mem) => assert_eq!(ext_csd.erased_mem_cont(), Ok(mem)),
                Err(err) => assert_eq!(ext_csd.erased_mem_cont(), Err(err)),
            }
        });
    }
}