From 20fa0560bb8458da6fc6b15452a63a7d6810dcf9 Mon Sep 17 00:00:00 2001
From: Sebastian Hugentobler <sebastian@vanwa.ch>
Date: Mon, 20 May 2024 15:32:00 +0200
Subject: [PATCH] initial commit

---
 .cargo/config.toml  |   8 +
 .gitignore          |   1 +
 Cargo.lock          | 823 ++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml          |  29 ++
 README.md           |  41 +++
 build.rs            |  35 ++
 deny.toml           | 232 +++++++++++++
 flake.lock          | 114 ++++++
 flake.nix           |  39 +++
 memory.x            |   6 +
 rust-toolchain.toml |   5 +
 src/main.rs         |  28 ++
 12 files changed, 1361 insertions(+)
 create mode 100644 .cargo/config.toml
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.md
 create mode 100644 build.rs
 create mode 100644 deny.toml
 create mode 100644 flake.lock
 create mode 100644 flake.nix
 create mode 100644 memory.x
 create mode 100644 rust-toolchain.toml
 create mode 100644 src/main.rs

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..ab4af1a
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,8 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "probe-rs run --chip nRF52840_xxAA --allow-erase-all"
+
+[build]
+target = "thumbv7em-none-eabi"
+
+[env]
+DEFMT_LOG = "info"
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..657c430
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,823 @@
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+version = "0.12.2"
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+checksum = "e4791cff995e6419a5ad1aebc3b3c9539d79125ca85eb5bfd2cff9b470b81071"
+dependencies = [
+ "cortex-m",
+ "cortex-m-rt",
+ "vcell",
+]
+
+[[package]]
+name = "nrf52832-pac"
+version = "0.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0242b685c9c15648fb803e155628f42ace457478b2cb930868f40cae2db925e0"
+dependencies = [
+ "cortex-m",
+ "cortex-m-rt",
+ "vcell",
+]
+
+[[package]]
+name = "nrf52833-pac"
+version = "0.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "10e1358255b360cdc816dd7b6ef81be8c8499c0998277e5249bed222bd0f5241"
+dependencies = [
+ "cortex-m",
+ "cortex-m-rt",
+ "vcell",
+]
+
+[[package]]
+name = "nrf52840-i2c-scanner"
+version = "0.1.0"
+dependencies = [
+ "cortex-m",
+ "cortex-m-rt",
+ "defmt",
+ "defmt-rtt",
+ "embassy-executor",
+ "embassy-nrf",
+ "panic-probe",
+]
+
+[[package]]
+name = "nrf52840-pac"
+version = "0.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "cortex-m",
+ "cortex-m-rt",
+ "vcell",
+]
+
+[[package]]
+name = "nrf5340-app-pac"
+version = "0.12.2"
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+dependencies = [
+ "cortex-m",
+ "cortex-m-rt",
+ "vcell",
+]
+
+[[package]]
+name = "nrf5340-net-pac"
+version = "0.12.2"
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+dependencies = [
+ "cortex-m",
+ "cortex-m-rt",
+ "vcell",
+]
+
+[[package]]
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+version = "0.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7344d74afb5684e00c48d175cad9619f36d629cfb0687d33b4d1bb86fba688f4"
+dependencies = [
+ "cortex-m",
+ "cortex-m-rt",
+ "vcell",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
+dependencies = [
+ "autocfg",
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+
+[[package]]
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+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4047d9235d1423d66cc97da7d07eddb54d4f154d6c13805c6d0793956f4f25b0"
+dependencies = [
+ "cortex-m",
+ "defmt",
+]
+
+[[package]]
+name = "pin-project-lite"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bda66fc9667c18cb2758a2ac84d1167245054bcf85d5d1aaa6923f45801bdd02"
+
+[[package]]
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+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
+
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+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+ "version_check",
+]
+
+[[package]]
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+ "proc-macro2",
+ "quote",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.83"
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+ "unicode-ident",
+]
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+
+[[package]]
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+dependencies = [
+ "semver",
+]
+
+[[package]]
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+checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
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+ "semver-parser",
+]
+
+[[package]]
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+
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+ "unicode-ident",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c546c80d6be4bc6a00c0f01730c08df82eaa7a7a61f11d656526506112cc1709"
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+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.65",
+]
+
+[[package]]
+name = "typenum"
+version = "1.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+version = "0.1.3"
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+
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
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+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+
+[[package]]
+name = "volatile-register"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de437e2a6208b014ab52972a27e59b33fa2920d3e00fe05026167a1c509d19cc"
+dependencies = [
+ "vcell",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..e7e4fec
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,29 @@
+[package]
+name = "nrf52840-i2c-scanner"
+version = "0.1.0"
+edition = "2021"
+license = "0BSD"
+authors = ["Sebastian Hugentobler <shu@vanwa.ch>"]
+repository = "https://code.vanwa.ch/shu/nrf-i2c-scanner"
+
+[dependencies.embassy-nrf]
+version = "0.1.0"
+git = "https://github.com/embassy-rs/embassy.git"
+rev = "3c52ef60b19468a8700d612699c869f0bdcae339"
+features = ["defmt", "nrf52840", "time-driver-rtc1", "gpiote", "unstable-pac", "time"]
+
+[dependencies.embassy-executor] 
+version = "0.5.0" 
+git = "https://github.com/embassy-rs/embassy.git" 
+rev = "3c52ef60b19468a8700d612699c869f0bdcae339"
+features = ["task-arena-size-32768", "arch-cortex-m", "executor-thread", "executor-interrupt", "defmt", "integrated-timers"]
+
+[dependencies]
+defmt = "0.3.6"
+defmt-rtt = "0.4.0"
+
+panic-probe = { version = "0.3.1", features = ["print-defmt"] }
+
+cortex-m = { version = "0.7.7", features = ["inline-asm", "critical-section-single-core"] }
+cortex-m-rt = "0.7.4"
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..592ed5f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,41 @@
+# nRF52840 DK I<sup>2</sup>C Scanner
+
+Quick and simple program to scan for used I<sup>2</sup>C addresses on an
+(nRF52840
+DK)[https://www.nordicsemi.com/Products/Development-hardware/nRF52840-DK].
+
+# Setup
+
+Connect I<sup>2</sup>C as follows:
+
+```
+GND -> GND
+VCC -> VDD
+SDA -> P0.03
+SCL -> P0.04
+```
+
+## Software
+
+Either use [nix](https://nixos.org/download/) and enter the dev shell with
+`nix develop` or ensure that at least the following is installed:
+
+- [rust](https://www.rust-lang.org/learn/get-started)
+- [probe-rs](https://probe.rs/)
+
+Attach the dev-kit with USB, turn it on and run `probe-rs list` to verify the
+connection. It should show something akin to the following:
+
+```
+The following debug probes were found:
+[0]: J-Link (J-Link) (VID: 1366, PID: 1051, Serial: 001050288663, JLink)
+```
+
+Run `cargo run` to compile the software and flash it. The resulting output will
+tell you at which addresses I<sup>2</sup>C devices were found.
+
+_Example output with a device at 0x27_
+
+```
+0.014221 INFO  i2c device at 0x27
+```
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/deny.toml b/deny.toml
new file mode 100644
index 0000000..a6a763e
--- /dev/null
+++ b/deny.toml
@@ -0,0 +1,232 @@
+# This template contains all of the possible sections and their default values
+
+# Note that all fields that take a lint level have these possible values:
+# * deny - An error will be produced and the check will fail
+# * warn - A warning will be produced, but the check will not fail
+# * allow - No warning or error will be produced, though in some cases a note
+# will be
+
+# The values provided in this template are the default values that will be used
+# when any section or field is not specified in your own configuration
+
+# Root options
+
+# The graph table configures how the dependency graph is constructed and thus
+# which crates the checks are performed against
+[graph]
+# If 1 or more target triples (and optionally, target_features) are specified,
+# only the specified targets will be checked when running `cargo deny check`.
+# This means, if a particular package is only ever used as a target specific
+# dependency, such as, for example, the `nix` crate only being used via the
+# `target_family = "unix"` configuration, that only having windows targets in
+# this list would mean the nix crate, as well as any of its exclusive
+# dependencies not shared by any other crates, would be ignored, as the target
+# list here is effectively saying which targets you are building for.
+targets = [
+    # The triple can be any string, but only the target triples built in to
+    # rustc (as of 1.40) can be checked against actual config expressions
+    #"x86_64-unknown-linux-musl",
+    # You can also specify which target_features you promise are enabled for a
+    # particular target. target_features are currently not validated against
+    # the actual valid features supported by the target architecture.
+    #{ triple = "wasm32-unknown-unknown", features = ["atomics"] },
+]
+# When creating the dependency graph used as the source of truth when checks are
+# executed, this field can be used to prune crates from the graph, removing them
+# from the view of cargo-deny. This is an extremely heavy hammer, as if a crate
+# is pruned from the graph, all of its dependencies will also be pruned unless
+# they are connected to another crate in the graph that hasn't been pruned,
+# so it should be used with care. The identifiers are [Package ID Specifications]
+# (https://doc.rust-lang.org/cargo/reference/pkgid-spec.html)
+#exclude = []
+# If true, metadata will be collected with `--all-features`. Note that this can't
+# be toggled off if true, if you want to conditionally enable `--all-features` it
+# is recommended to pass `--all-features` on the cmd line instead
+all-features = false
+# If true, metadata will be collected with `--no-default-features`. The same
+# caveat with `all-features` applies
+no-default-features = false
+# If set, these feature will be enabled when collecting metadata. If `--features`
+# is specified on the cmd line they will take precedence over this option.
+#features = []
+
+# The output table provides options for how/if diagnostics are outputted
+[output]
+# When outputting inclusion graphs in diagnostics that include features, this
+# option can be used to specify the depth at which feature edges will be added.
+# This option is included since the graphs can be quite large and the addition
+# of features from the crate(s) to all of the graph roots can be far too verbose.
+# This option can be overridden via `--feature-depth` on the cmd line
+feature-depth = 1
+
+# This section is considered when running `cargo deny check advisories`
+# More documentation for the advisories section can be found here:
+# https://embarkstudios.github.io/cargo-deny/checks/advisories/cfg.html
+[advisories]
+# The path where the advisory databases are cloned/fetched into
+#db-path = "$CARGO_HOME/advisory-dbs"
+# The url(s) of the advisory databases to use
+#db-urls = ["https://github.com/rustsec/advisory-db"]
+# A list of advisory IDs to ignore. Note that ignored advisories will still
+# output a note when they are encountered.
+ignore = [
+    #"RUSTSEC-0000-0000",
+    #{ id = "RUSTSEC-0000-0000", reason = "you can specify a reason the advisory is ignored" },
+    #"a-crate-that-is-yanked@0.1.1", # you can also ignore yanked crate versions if you wish
+    #{ crate = "a-crate-that-is-yanked@0.1.1", reason = "you can specify why you are ignoring the yanked crate" },
+]
+# If this is true, then cargo deny will use the git executable to fetch advisory database.
+# If this is false, then it uses a built-in git library.
+# Setting this to true can be helpful if you have special authentication requirements that cargo-deny does not support.
+# See Git Authentication for more information about setting up git authentication.
+#git-fetch-with-cli = true
+
+# This section is considered when running `cargo deny check licenses`
+# More documentation for the licenses section can be found here:
+# https://embarkstudios.github.io/cargo-deny/checks/licenses/cfg.html
+[licenses]
+# List of explicitly allowed licenses
+# See https://spdx.org/licenses/ for list of possible licenses
+# [possible values: any SPDX 3.11 short identifier (+ optional exception)].
+allow = [
+  "0BSD",
+  "Apache-2.0",
+  "MIT",
+  "Unicode-DFS-2016"
+]
+# The confidence threshold for detecting a license from license text.
+# The higher the value, the more closely the license text must be to the
+# canonical license text of a valid SPDX license file.
+# [possible values: any between 0.0 and 1.0].
+confidence-threshold = 0.8
+# Allow 1 or more licenses on a per-crate basis, so that particular licenses
+# aren't accepted for every possible crate as with the normal allow list
+exceptions = [
+    # Each entry is the crate and version constraint, and its specific allow
+    # list
+    #{ allow = ["Zlib"], crate = "adler32" },
+]
+
+# Some crates don't have (easily) machine readable licensing information,
+# adding a clarification entry for it allows you to manually specify the
+# licensing information
+#[[licenses.clarify]]
+# The package spec the clarification applies to
+#crate = "ring"
+# The SPDX expression for the license requirements of the crate
+#expression = "MIT AND ISC AND OpenSSL"
+# One or more files in the crate's source used as the "source of truth" for
+# the license expression. If the contents match, the clarification will be used
+# when running the license check, otherwise the clarification will be ignored
+# and the crate will be checked normally, which may produce warnings or errors
+# depending on the rest of your configuration
+#license-files = [
+# Each entry is a crate relative path, and the (opaque) hash of its contents
+#{ path = "LICENSE", hash = 0xbd0eed23 }
+#]
+
+[licenses.private]
+# If true, ignores workspace crates that aren't published, or are only
+# published to private registries.
+# To see how to mark a crate as unpublished (to the official registry),
+# visit https://doc.rust-lang.org/cargo/reference/manifest.html#the-publish-field.
+ignore = false
+# One or more private registries that you might publish crates to, if a crate
+# is only published to private registries, and ignore is true, the crate will
+# not have its license(s) checked
+registries = [
+    #"https://sekretz.com/registry
+]
+
+# This section is considered when running `cargo deny check bans`.
+# More documentation about the 'bans' section can be found here:
+# https://embarkstudios.github.io/cargo-deny/checks/bans/cfg.html
+[bans]
+# Lint level for when multiple versions of the same crate are detected
+multiple-versions = "allow"
+# Lint level for when a crate version requirement is `*`
+wildcards = "allow"
+# The graph highlighting used when creating dotgraphs for crates
+# with multiple versions
+# * lowest-version - The path to the lowest versioned duplicate is highlighted
+# * simplest-path - The path to the version with the fewest edges is highlighted
+# * all - Both lowest-version and simplest-path are used
+highlight = "all"
+# The default lint level for `default` features for crates that are members of
+# the workspace that is being checked. This can be overridden by allowing/denying
+# `default` on a crate-by-crate basis if desired.
+workspace-default-features = "allow"
+# The default lint level for `default` features for external crates that are not
+# members of the workspace. This can be overridden by allowing/denying `default`
+# on a crate-by-crate basis if desired.
+external-default-features = "allow"
+# List of crates that are allowed. Use with care!
+allow = [
+    #"ansi_term@0.11.0",
+    #{ crate = "ansi_term@0.11.0", reason = "you can specify a reason it is allowed" },
+]
+# List of crates to deny
+deny = [
+    #"ansi_term@0.11.0",
+    #{ crate = "ansi_term@0.11.0", reason = "you can specify a reason it is banned" },
+    # Wrapper crates can optionally be specified to allow the crate when it
+    # is a direct dependency of the otherwise banned crate
+    #{ crate = "ansi_term@0.11.0", wrappers = ["this-crate-directly-depends-on-ansi_term"] },
+]
+
+# List of features to allow/deny
+# Each entry the name of a crate and a version range. If version is
+# not specified, all versions will be matched.
+#[[bans.features]]
+#crate = "reqwest"
+# Features to not allow
+#deny = ["json"]
+# Features to allow
+#allow = [
+#    "rustls",
+#    "__rustls",
+#    "__tls",
+#    "hyper-rustls",
+#    "rustls",
+#    "rustls-pemfile",
+#    "rustls-tls-webpki-roots",
+#    "tokio-rustls",
+#    "webpki-roots",
+#]
+# If true, the allowed features must exactly match the enabled feature set. If
+# this is set there is no point setting `deny`
+#exact = true
+
+# Certain crates/versions that will be skipped when doing duplicate detection.
+skip = [
+    #"ansi_term@0.11.0",
+    #{ crate = "ansi_term@0.11.0", reason = "you can specify a reason why it can't be updated/removed" },
+]
+# Similarly to `skip` allows you to skip certain crates during duplicate
+# detection. Unlike skip, it also includes the entire tree of transitive
+# dependencies starting at the specified crate, up to a certain depth, which is
+# by default infinite.
+skip-tree = [
+    #"ansi_term@0.11.0", # will be skipped along with _all_ of its direct and transitive dependencies
+    #{ crate = "ansi_term@0.11.0", depth = 20 },
+]
+
+# This section is considered when running `cargo deny check sources`.
+# More documentation about the 'sources' section can be found here:
+# https://embarkstudios.github.io/cargo-deny/checks/sources/cfg.html
+[sources]
+# Lint level for what to happen when a crate from a crate registry that is not
+# in the allow list is encountered
+unknown-registry = "warn"
+# Lint level for what to happen when a crate from a git repository that is not
+# in the allow list is encountered
+unknown-git = "warn"
+# List of URLs for allowed crate registries. Defaults to the crates.io index
+# if not specified. If it is specified but empty, no registries are allowed.
+allow-registry = ["https://github.com/rust-lang/crates.io-index"]
+# List of URLs for allowed Git repositories
+allow-git = [
+  "https://github.com/embassy-rs/embassy.git"
+]
+
+[sources.allow-org]
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..2980d8a
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,114 @@
+{
+  "nodes": {
+    "fenix": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1716186410,
+        "narHash": "sha256-U/5eHWooIohw8uF0cQd8ZQll8gMZxb0QeaVEGrXJCgY=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "49bf3506637ee9f30ab589104f479ec61db5924c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1715961556,
+        "narHash": "sha256-+NpbZRCRisUHKQJZF3CT+xn14ZZQO+KjxIIanH3Pvn4=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "4a6b83b05df1a8bd7d99095ec4b4d271f2956b64",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1716137900,
+        "narHash": "sha256-sowPU+tLQv8GlqtVtsXioTKeaQvlMz/pefcdwg8MvfM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "6c0b7a92c30122196a761b440ac0d46d3d9954f1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "fenix": "fenix",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs_2"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1716107283,
+        "narHash": "sha256-NJgrwLiLGHDrCia5AeIvZUHUY7xYGVryee0/9D3Ir1I=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "21ec8f523812b88418b2bfc64240c62b3dd967bd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..9736dfc
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,39 @@
+{
+  description = "nrf52840-i2c-scanner flake";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    fenix.url = "github:nix-community/fenix";
+  };
+
+  outputs =
+    {
+      nixpkgs,
+      fenix,
+      flake-utils,
+      ...
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        rust =
+          with fenix.packages.${system};
+          fromToolchainFile {
+            file = ./rust-toolchain.toml;
+            sha256 = "sha256-opUgs6ckUQCyDxcB9Wy51pqhd0MPGHUVbwRKKPGiwZU=";
+          };
+      in
+      with pkgs;
+      {
+        devShells.default = mkShell {
+          buildInputs = [
+            cargo-deny
+            rust
+            rust-analyzer
+            probe-rs
+          ];
+        };
+      }
+    );
+}
diff --git a/memory.x b/memory.x
new file mode 100644
index 0000000..b86bf59
--- /dev/null
+++ b/memory.x
@@ -0,0 +1,6 @@
+MEMORY
+{
+  /* NOTE 1 K = 1 KiBi = 1024 bytes */
+  FLASH : ORIGIN = 0x00000000, LENGTH = 1024K
+  RAM : ORIGIN = 0x20000000, LENGTH = 256K
+}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..d15992e
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,5 @@
+[toolchain]
+channel = "stable"
+components = [ "clippy", "rustfmt" ]
+targets = [ "thumbv7em-none-eabi", "thumbv7em-none-eabihf" ]
+profile = "minimal"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..4803a8e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,28 @@
+#![no_std]
+#![no_main]
+
+use defmt::info;
+use embassy_executor::Spawner;
+use embassy_nrf::{
+    bind_interrupts, peripherals,
+    twim::{self, Twim},
+};
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    SPIM0_SPIS0_TWIM0_TWIS0_SPI0_TWI0 => twim::InterruptHandler<peripherals::TWISPI0>;
+});
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_nrf::init(Default::default());
+
+    let config = twim::Config::default();
+    let mut i2c = Twim::new(p.TWISPI0, Irqs, p.P0_03, p.P0_04, config);
+
+    for addr in 1..=u8::MAX {
+        if i2c.read(addr, &mut [0]).await.is_ok() {
+            info!("i2c device at 0x{:02X}", addr)
+        }
+    }
+}