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# ral-registers
[](https://crates.io/crates/ral-registers)
[](https://docs.rs/ral-registers)
This crate contains an MMIO abstraction that uses macros to read, modify,
and write fields in registers.
For example, several fields on a register can be updated (without changing the
other fields) using:
```rust
// Modify some fields on GPIOA.MODER without changing others.
modify_reg!(gpio, GPIOA, MODER, MODER1: Input, MODER2: Output, MODER3: Input);
// Check a condition on a field.
while read_reg!(gpio, GPIOA, IDR, IDR3 == High) {}
// Read and write the entire register word value.
let port = read_reg!(gpio, GPIOA, IDR);
write_reg!(gpio, GPIOA, port);
```
This crate contains register code originally written in
[stm32ral](https://github.com/adamgreig/stm32ral), extracted
for easier use in other projects.
## Licence
Licensed under either of
* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
## Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.
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