dma_api/
dbox.rs

1use crate::{DeviceDma, Direction, DmaError, common::DCommon};
2
3pub struct DBox<T> {
4    data: DCommon<T>,
5}
6
7impl<T> DBox<T> {
8    pub(crate) fn new_zero(
9        os: &DeviceDma,
10        align: usize,
11        direction: Direction,
12    ) -> Result<Self, DmaError> {
13        let mut data = DCommon::new(os, core::mem::size_of::<T>(), align, direction)?;
14        data.as_mut_slice().fill(0);
15        data.confirm_write_all();
16        Ok(Self { data })
17    }
18
19    pub fn dma_addr(&self) -> crate::DmaAddr {
20        self.data.handle.dma_addr
21    }
22
23    pub fn read(&self) -> T {
24        unsafe {
25            self.data.prepare_read(0, core::mem::size_of::<T>());
26            let ptr = self.data.get_ptr(0).cast::<T>();
27            ptr.read_volatile()
28        }
29    }
30
31    pub fn write(&mut self, value: T) {
32        unsafe {
33            let ptr = self.data.get_ptr(0).cast::<T>();
34            ptr.write_volatile(value);
35            self.data.confirm_write(0, core::mem::size_of::<T>());
36        }
37    }
38
39    pub fn modify(&mut self, f: impl FnOnce(&mut T)) {
40        let mut value = self.read();
41        f(&mut value);
42        self.write(value);
43    }
44
45    /// 获取底层缓冲区的可变切片
46    ///
47    /// # Safety
48    ///
49    ///
50    pub unsafe fn as_buff_slice_mut(&mut self) -> &mut [u8] {
51        self.data.as_mut_slice()
52    }
53}
dma_api/dbox.rs

dma_api/
dbox.rs
