Trait LiteXSoCRegisterConfiguration

Source

pub trait LiteXSoCRegisterConfiguration {
    type ReadOnly8: BaseReadableRegister<u8, Reg = ()>;
    type WriteOnly8: BaseWriteableRegister<u8, Reg = ()>;
    type ReadWrite8: BaseReadableRegister<u8, Reg = ()> + BaseWriteableRegister<u8, Reg = ()>;
    type ReadOnly16: BaseReadableRegister<u16, Reg = ()>;
    type WriteOnly16: BaseWriteableRegister<u16, Reg = ()>;
    type ReadWrite16: BaseReadableRegister<u16, Reg = ()> + BaseWriteableRegister<u16, Reg = ()>;
    type ReadOnly32: BaseReadableRegister<u32, Reg = ()>;
    type WriteOnly32: BaseWriteableRegister<u32, Reg = ()>;
    type ReadWrite32: BaseReadableRegister<u32, Reg = ()> + BaseWriteableRegister<u32, Reg = ()>;
    type ReadOnly64: BaseReadableRegister<u64, Reg = ()>;
    type WriteOnly64: BaseWriteableRegister<u64, Reg = ()>;
    type ReadWrite64: BaseReadableRegister<u64, Reg = ()> + BaseWriteableRegister<u64, Reg = ()>;
}

Expand description

Register abstraction types collection

This trait defines a collection of types for a certain set of LiteX configuration options. It provides types with all accessibility constraints (Read, Write, ReadWrite) for every defined register width.

All types must be over a common register layout configuration, having identical

base integer width
CSR data width
endianness

§Generic Register Type Arguments

Usually registers are generic over a RegisterLongName type arguments, such that the Field and FieldValue arguments of the various methods make sense.

Unfortunately, those generic type arguments cannot be passed through associated types in traits until generic associated types stabilize.

In the meantime, the types ReadRegWrapper, WriteRegWrapper and ReadWriteRegWrapper can be used to access fields in a register as commonly done in tock-registers:

pub struct LiteXUartRegisters<R: LiteXSoCRegisterConfiguration> {
  txfull: R::ReadOnly8,
}

register_bitfields![u8,
  txfull [
    full OFFSET(0) NUMBITS(1) []
  ],
];

ReadRegWrapper::wrap(&regs.txfull).is_set(txfull::full)