# memsolve  [](https://crates.io/crates/memsolve) [](https://docs.rs/memsolve) [](https://codeberg.org/bergzand/memsolve/)
Memsolve is a crate to generate ROM Memory Layouts for microcontrollers and other embedded
devices.
Microcontrollers have limited flash (ROM) available, separated into pages. This flash can used
for multiple purposes, a bootloader, data storage, multiple applications. memsolve allows for
describing the different requirements of these sections, whether thats a set number of pages or
a minimal size, and uses a linear solver to resolve the layout into addresses for the flash
layout. This layout can then be used as basis for the `memory.x` file in projects such as
[Embassy][__link0] or [Ariel OS][__link1]
## Overview
This section gives a brief overview of the primary types in this crate:
* [`Memory`][__link2] is the primary object and represents the memory layout.
* [`Chip`][__link3] describes the target of the layout, including the total size of the flash and the
page size
* [`Section`][__link4] describes the requirements on a single section.
## Example: simple layout
This example shows how to generate a layout for a microcontroller where one section will
contain the application and another contains some configuration. The application section must be as
large as possible within the flash and the configuration section requires 3 pages, but no
specific minimum size.
```rust
use memsolve::{Memory, section::Section, chip::Chip, information::Information};
use uom::si::information::{byte, kibibyte};
// Our example chip has 64 KiB Flash with 2048 byte pages
let chip = Chip::new(Information::new::<byte>(2048), 0x800_000, Information::new::<kibibyte>(64))?;
let mut memory = Memory::new(chip);
// Add the application section
memory.add_section(
Section::new("app")?
.set_boot(true)
.set_maximize(true)
);
// Add the configuration storage section
memory.add_section(
Section::new("config")?
.set_pages(3)
);
// This layout is fully resolved
let layout = memory.resolve_layout()?;
assert_eq!(layout[0].address, 0x800_000);
assert_eq!(layout[0].pages, 29);
assert_eq!(layout[1].address, 0x80E_800);
assert_eq!(layout[1].pages, 3);
```
[__cargo_doc2readme_dependencies_info]: ggGmYW0CYXZlMC43LjJhdIQb2o_SNWoR6AAb3_T-k0ODPHwbnQW7uS_D2XsbjVFFtK-lC3BhYvVhcoQbUB8Gwr6tJ_MbT1dfi11DK3cbZ_NiZtL6zPkbSkno8b3FDVVhZIKCZ0VtYmFzc3n2gmhtZW1zb2x2ZWUwLjEuMA
[__link0]: https://crates.io/crates/Embassy
[__link1]: Ariel OS
[__link2]: https://docs.rs/memsolve/0.1.0/memsolve/struct.Memory.html
[__link3]: https://docs.rs/memsolve/0.1.0/memsolve/?search=chip::Chip
[__link4]: https://docs.rs/memsolve/0.1.0/memsolve/?search=section::Section