Trait atsamd_hal::sercom::spi_future::CheckBufLen

source · [−]
pub trait CheckBufLen: AnySpi {
    const LEN: usize = <Self::Size as Unsigned>::USIZE;
    const STEP: usize = _;

    fn len(&self) -> usize { ... }
    fn step(&self) -> usize { ... }
    fn check_buf_len(&self, buf: &impl AsRef<[u8]>) { ... }
}
Expand description

Trait used to verify the SpiFuture buffer length

Provided Associated Constants

Spi transaction length

This value is zero for an Spi with DynLength

Step size through the SpiFuture buffer

This is equal to the number of bytes sent in each write to the SPI DATA register. It is zero for an Spi with DynLength.

Provided Methods

Return the Spi transaction length

In most cases, this returns the corresponding constant. For SAMx5x chips with DynLength, this returns the result of Spi::get_dyn_length.

Return the step size through the SpiFuture buffer

In most cases, this returns the corresponding constant. For SAMx5x chips with DynLength, this returns a result calculated from Self::len.

Check that the buffer has a valid length

If the transaction length is greater than four, then the size of the buffer must equal the transaction length. If the transaction length is less than or equal to four, then the size of the buffer must be an integer multiple of the transaction length.

Both of these statements apply regardless of whether the Spi has a DynLength.

Implementors