commit 20fa0560bb8458da6fc6b15452a63a7d6810dcf9
Author: Sebastian Hugentobler <sebastian@vanwa.ch>
Date:   Mon May 20 15:32:00 2024 +0200

    initial commit

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 @@
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diff --git a/.gitignore b/.gitignore
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index 0000000..ea8c4bf
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diff --git a/Cargo.lock b/Cargo.lock
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index 0000000..657c430
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+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"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "cortex-m",
+ "cortex-m-rt",
+ "vcell",
+]
+
+[[package]]
+name = "nrf5340-net-pac"
+version = "0.12.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5c03e44df22fe5888109fe42e523162c7059adf4d30860f4f73ecc8b1fc16fe"
+dependencies = [
+ "cortex-m",
+ "cortex-m-rt",
+ "vcell",
+]
+
+[[package]]
+name = "nrf9160-pac"
+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",
+]
+
+[[package]]
+name = "panic-probe"
+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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+version = "1.0.4"
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+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b33eb56c327dec362a9e55b3ad14f9d2f0904fb5a5b03b513ab5465399e9f43"
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+ "unicode-ident",
+]
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+[[package]]
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+
+[[package]]
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+dependencies = [
+ "semver",
+]
+
+[[package]]
+name = "semver"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
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+ "semver-parser",
+]
+
+[[package]]
+name = "semver-parser"
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+
+[[package]]
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+
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+
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+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2863d96a84c6439701d7a38f9de935ec562c8832cc55d1dde0f513b52fad106"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.61"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c546c80d6be4bc6a00c0f01730c08df82eaa7a7a61f11d656526506112cc1709"
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+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.61"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46c3384250002a6d5af4d114f2845d37b57521033f30d5c3f46c4d70e1197533"
+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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+
+[[package]]
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+
+[[package]]
+name = "vcell"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77439c1b53d2303b20d9459b1ade71a83c716e3f9c34f3228c00e6f185d6c002"
+
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
+[[package]]
+name = "void"
+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)
+        }
+    }
+}