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use core::ops::{Deref, DerefMut};
use aligned::{A4, Aligned};
use sdio_host::common_cmd::{R1, Rz, cmd};
use sdio_host::sd::BusWidth;
use sdio_host::sd_cmd;
use crate::sdmmc::{DatapathMode, Error, Sdmmc, aligned_mut, aligned_ref, block_size, slice8_mut, slice8_ref};
use crate::time::Hertz;
/// Aligned data block for SDMMC transfers.
///
/// This is a 64-byte array, aligned to 4 bytes to satisfy DMA requirements.
#[repr(align(4))]
#[derive(Debug, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "defmt", derive(defmt::Format))]
pub struct DataBlock(pub [u32; 16]);
impl DataBlock {
/// Create a new DataBlock
pub const fn new() -> Self {
DataBlock([0u32; 16])
}
}
impl Deref for DataBlock {
type Target = [u8; 64];
fn deref(&self) -> &Self::Target {
unwrap!(slice8_ref(&self.0[..]).try_into())
}
}
impl DerefMut for DataBlock {
fn deref_mut(&mut self) -> &mut Self::Target {
unwrap!(slice8_mut(&mut self.0[..]).try_into())
}
}
/// Storage Device
pub struct SerialDataInterface<'a, 'b> {
/// Inner member
sdmmc: &'a mut Sdmmc<'b>,
}
/// Card Storage Device
impl<'a, 'b> SerialDataInterface<'a, 'b> {
/// Create a new SD card
pub async fn new(sdmmc: &'a mut Sdmmc<'b>, freq: Hertz) -> Result<Self, Error> {
let mut s = Self { sdmmc };
s.acquire(freq).await?;
Ok(s)
}
/// Initializes the card into a known state (or at least tries to).
async fn acquire(&mut self, _freq: Hertz) -> Result<(), Error> {
let _scoped_block_stop = self.sdmmc.info.rcc.block_stop();
let _bus_width = match self.sdmmc.bus_width() {
BusWidth::Eight => return Err(Error::BusWidth),
bus_width => bus_width,
};
// While the SD/SDIO card or eMMC is in identification mode,
// the SDMMC_CK frequency must be no more than 400 kHz.
self.sdmmc.init_idle()?;
self.sdmmc.cmd(cmd::<Rz>(5, 0), false)?;
// Get RCA
let rca = self.sdmmc.cmd(sd_cmd::send_relative_address(), false)?;
// Select the card with RCA
self.sdmmc.select_card(Some(rca.try_into().unwrap()))?;
Ok(())
}
/// Set the bus to the 4-bit high-speed frequency
pub fn set_bus_to_high_speed(&mut self, frequency: Hertz) -> Result<(), Error> {
self.sdmmc.clkcr_set_clkdiv(frequency, BusWidth::Four)?;
Ok(())
}
/// Run cmd52
pub async fn cmd52(&mut self, arg: u32) -> Result<u32, Error> {
self.sdmmc.cmd(cmd::<R1>(52, arg), false)
}
/// Read in block mode using cmd53
pub async fn cmd53_block_read(&mut self, arg: u32, blocks: &mut [DataBlock]) -> Result<(), Error> {
let _scoped_block_stop = self.sdmmc.info.rcc.block_stop();
// NOTE(unsafe) reinterpret buffer as &mut [u32]
let buffer = unsafe {
core::slice::from_raw_parts_mut(
blocks.as_mut_ptr() as *mut u32,
blocks.len() * size_of::<DataBlock>() / size_of::<u32>(),
)
};
let transfer = self.sdmmc.prepare_datapath_read(
aligned_mut(buffer),
DatapathMode::Block(block_size(size_of::<DataBlock>())),
);
self.sdmmc.cmd(cmd::<Rz>(53, arg), true)?;
self.sdmmc.complete_datapath_transfer(transfer, false).await?;
self.sdmmc.clear_interrupt_flags();
Ok(())
}
/// Read in multibyte mode using cmd53
pub async fn cmd53_byte_read(&mut self, arg: u32, buffer: &mut Aligned<A4, [u8]>) -> Result<(), Error> {
let _scoped_block_stop = self.sdmmc.info.rcc.block_stop();
let transfer = self.sdmmc.prepare_datapath_read(buffer, DatapathMode::Byte);
self.sdmmc.cmd(cmd::<Rz>(53, arg), true)?;
self.sdmmc.complete_datapath_transfer(transfer, false).await?;
self.sdmmc.clear_interrupt_flags();
Ok(())
}
/// Write in block mode using cmd53
pub async fn cmd53_block_write(&mut self, arg: u32, blocks: &[DataBlock]) -> Result<(), Error> {
let _scoped_block_stop = self.sdmmc.info.rcc.block_stop();
// NOTE(unsafe) reinterpret buffer as &mut [u32]
let buffer = unsafe {
core::slice::from_raw_parts_mut(
blocks.as_ptr() as *mut u32,
blocks.len() * size_of::<DataBlock>() / size_of::<u32>(),
)
};
#[cfg(sdmmc_v1)]
self.sdmmc.cmd(cmd::<Rz>(53, arg), true)?;
let transfer = self.sdmmc.prepare_datapath_write(
aligned_ref(buffer),
DatapathMode::Block(block_size(size_of::<DataBlock>())),
);
#[cfg(sdmmc_v2)]
self.sdmmc.cmd(cmd::<Rz>(53, arg), true)?;
self.sdmmc.complete_datapath_transfer(transfer, false).await?;
self.sdmmc.clear_interrupt_flags();
Ok(())
}
/// Write in multibyte mode using cmd53
pub async fn cmd53_byte_write(&mut self, arg: u32, buffer: &[u32]) -> Result<(), Error> {
let _scoped_block_stop = self.sdmmc.info.rcc.block_stop();
#[cfg(sdmmc_v1)]
self.sdmmc.cmd(cmd::<Rz>(53, arg), true)?;
let transfer = self
.sdmmc
.prepare_datapath_write(aligned_ref(buffer), DatapathMode::Byte);
#[cfg(sdmmc_v2)]
self.sdmmc.cmd(cmd::<Rz>(53, arg), true)?;
self.sdmmc.complete_datapath_transfer(transfer, false).await?;
self.sdmmc.clear_interrupt_flags();
Ok(())
}
}
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