ruspiro-mmio-register 0.1.3

The crate provides macros to conviniently define memory mapped I/O (MMIO) registers.

RusPiRo MMIO Register

The crate provides macros to conviniently define memory mapped I/O (MMIO) registers.

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To use this crate simply add the dependency to your Cargo.toml file:

ruspiro-mmio-register = "0.1.1"

The definition of MMIO registers is straight forward using the provided define_mmio_register! macro like so:

use ruspiro_mmio_register::*;

    /// FOO Register with read/write access, 32 bit wide and mapped at memory
    /// address 0x3F20_0000
    FOO<ReadWrite<u32>@(0x3F20_0000)> {
        /// This register provides a field BAR at offset 0 covering 1 Bit
        BAR OFFSET(0),
        /// There is another field BAZ at offset 1 covering 3 Bits
        BAZ OFFSET(1) BITS(3),
        /// The third field BAL also has specific predefined values
        BAL OFFSET(4) BITS(2) [
            /// Field Value 1
            VAL1 = 0b01,
            /// Field Value 2
            VAL2 = 0b10

Once the register is defined it can be used to read data from or write data to, depending on its type (ReadOnly, WriteOnly, ReadWrite).

fn main() {
    // write a specific value to a field of the register
    FOO::Register.write_value( FOO::BAL::VAL1 );

    // combine two field values with logical OR
    FOO::Register.write_value( FOO::BAL::VAL1 | FOO::BAL::VAL2 );

    // if there is no field defined for the MMIO register or raw value storage
    // is preffered the raw value could be written
    FOO::Register.write(FOO::BAZ, 0b101);

    // reading from the MMIO register works in a simmilar way
    let baz_val =; // return 0b01 or 0b10 eg.
    let baz_field = FOO::Register.read_value(FOO::BAL); // returns a FieldValue
    let raw_val = FOO::Register.get();


Licensed under Apache License, Version 2.0, (LICENSE-APACHE or or MIT (LICENSE-MIT or at your choice.