commit fef15d4f94e7853133eb6ff048401f8b1e67f5a6 Author: Mira Kristipati Date: Tue May 13 22:52:50 2025 -0400 Initial Commit diff --git a/.cargo/config.toml b/.cargo/config.toml new file mode 100644 index 0000000..045f650 --- /dev/null +++ b/.cargo/config.toml @@ -0,0 +1,14 @@ +# +# Cargo Configuration for the https://github.com/rp-rs/rp-hal.git repository. +# +# You might want to make a similar file in your own repository if you are +# writing programs for Raspberry Silicon microcontrollers. +# + +[build] +# Set the default target to match the Cortex-M33 in the RP2350 +target = "thumbv8m.main-none-eabihf" + +[target.'cfg(all(target_arch = "arm", target_os = "none"))'] +# runner = "elf2uf2-rs --deploy --serial --verbose" +runner = "picotool load -u -v -x -t elf" diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ea8c4bf --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/target diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..32d1e8a --- 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"binary-info"] } +embassy-time = "0.4.0" +panic-probe = "1.0.0" +rand = {version = "0.8.5", default-features = false } diff --git a/build.rs b/build.rs new file mode 100644 index 0000000..30691aa --- /dev/null +++ b/build.rs @@ -0,0 +1,35 @@ +//! This build script copies the `memory.x` file from the crate root into +//! a directory where the linker can always find it at build time. +//! For many projects this is optional, as the linker always searches the +//! project root directory -- wherever `Cargo.toml` is. However, if you +//! are using a workspace or have a more complicated build setup, this +//! build script becomes required. Additionally, by requesting that +//! Cargo re-run the build script whenever `memory.x` is changed, +//! updating `memory.x` ensures a rebuild of the application with the +//! new memory settings. + +use std::env; +use std::fs::File; +use std::io::Write; +use std::path::PathBuf; + +fn main() { + // Put `memory.x` in our output directory and ensure it's + // on the linker search path. + let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap()); + File::create(out.join("memory.x")) + .unwrap() + .write_all(include_bytes!("memory.x")) + .unwrap(); + println!("cargo:rustc-link-search={}", out.display()); + + // By default, Cargo will re-run a build script whenever + // any file in the project changes. By specifying `memory.x` + // here, we ensure the build script is only re-run when + // `memory.x` is changed. + println!("cargo:rerun-if-changed=memory.x"); + + println!("cargo:rustc-link-arg-bins=--nmagic"); + println!("cargo:rustc-link-arg-bins=-Tlink.x"); + println!("cargo:rustc-link-arg-bins=-Tdefmt.x"); +} diff --git a/memory.x b/memory.x new file mode 100644 index 0000000..c803896 --- /dev/null +++ b/memory.x @@ -0,0 +1,75 @@ +MEMORY { + /* + * The RP2350 has either external or internal flash. + * + * 2 MiB is a safe default here, although a Pico 2 has 4 MiB. + */ + FLASH : ORIGIN = 0x10000000, LENGTH = 2048K + /* + * RAM consists of 8 banks, SRAM0-SRAM7, with a striped mapping. + * This is usually good for performance, as it distributes load on + * those banks evenly. + */ + RAM : ORIGIN = 0x20000000, LENGTH = 512K + /* + * RAM banks 8 and 9 use a direct mapping. They can be used to have + * memory areas dedicated for some specific job, improving predictability + * of access times. + * Example: Separate stacks for core0 and core1. + */ + SRAM4 : ORIGIN = 0x20080000, LENGTH = 4K + SRAM5 : ORIGIN = 0x20081000, LENGTH = 4K +} + +SECTIONS { + /* ### Boot ROM info + * + * Goes after .vector_table, to keep it in the first 4K of flash + * where the Boot ROM (and picotool) can find it + */ + .start_block : ALIGN(4) + { + __start_block_addr = .; + KEEP(*(.start_block)); + KEEP(*(.boot_info)); + } > FLASH + +} INSERT AFTER .vector_table; + +/* move .text to start /after/ the boot info */ +_stext = ADDR(.start_block) + SIZEOF(.start_block); + +SECTIONS { + /* ### Picotool 'Binary Info' Entries + * + * Picotool looks through this block (as we have pointers to it in our + * header) to find interesting information. + */ + .bi_entries : ALIGN(4) + { + /* We put this in the header */ + __bi_entries_start = .; + /* Here are the entries */ + KEEP(*(.bi_entries)); + /* Keep this block a nice round size */ + . = ALIGN(4); + /* We put this in the header */ + __bi_entries_end = .; + } > FLASH +} INSERT AFTER .text; + +SECTIONS { + /* ### Boot ROM extra info + * + * Goes after everything in our program, so it can contain a signature. + */ + .end_block : ALIGN(4) + { + __end_block_addr = .; + KEEP(*(.end_block)); + } > FLASH + +} INSERT AFTER .uninit; + +PROVIDE(start_to_end = __end_block_addr - __start_block_addr); +PROVIDE(end_to_start = __start_block_addr - __end_block_addr); diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..0be0939 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,31 @@ +//! This example shows TRNG usage + +#![no_std] +#![no_main] + +use defmt::*; +use embassy_executor::Spawner; +use embassy_rp::bind_interrupts; +use embassy_rp::peripherals::TRNG; +use embassy_rp::trng::Trng; +use rand::RngCore; +use {defmt_rtt as _, panic_probe as _}; + +bind_interrupts!(struct Irqs { + TRNG_IRQ => embassy_rp::trng::InterruptHandler; +}); + +#[embassy_executor::main] +async fn main(_spawner: Spawner) { + let peripherals = embassy_rp::init(Default::default()); + + // Initialize the TRNG with default configuration + let mut trng = Trng::new(peripherals.TRNG, Irqs, embassy_rp::trng::Config::default()); + // A buffer to collect random bytes in. + let mut randomness = [0u8; 58]; + + + loop { + println!("Hello, world!"); + } +}