Setup project structure

.envrc

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+use flake

.gitignore

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+.direnv/
+.cache/
+build/

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+project(blink)
+target_sources(app PRIVATE src/main.c)

flake.lock

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+{
+  "nodes": {
+    "artemist-packages": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "utils": [
+          "utils"
+        ]
+      },
+      "locked": {
+        "lastModified": 1699858083,
+        "narHash": "sha256-EXmVoYDYszdWlaxRzedQ3Q7ehbqIGfbe9EaHSBD4cgQ=",
+        "ref": "refs/heads/canon",
+        "rev": "453af715eebd7102131d2cc6846dd23d49f853ac",
+        "revCount": 12,
+        "type": "git",
+        "url": "https://git.mildlyfunctional.gay/artemist/packages.git"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://git.mildlyfunctional.gay/artemist/packages.git"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1700108881,
+        "narHash": "sha256-+Lqybl8kj0+nD/IlAWPPG/RDTa47gff9nbei0u7BntE=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "7414e9ee0b3e9903c24d3379f577a417f0aae5f1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "artemist-packages": "artemist-packages",
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    utils.url = "github:numtide/flake-utils";
+    artemist-packages = {
+      url = "git+https://git.mildlyfunctional.gay/artemist/packages.git";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.utils.follows = "utils";
+    };
+  };
+  outputs = { self, nixpkgs, utils, artemist-packages }:
+    utils.lib.eachDefaultSystem (system:
+      let pkgs = import nixpkgs { inherit system; };
+      in rec {
+        devShells.zephyr =
+          artemist-packages.devShells.${system}.zephyr.override {
+            toolchains =
+              with artemist-packages.packages.${system}.zephyr.toolchains;
+              [ xtensa-espressif_esp32_zephyr-elf ];
+            modules =
+              with artemist-packages.packages.${system}.zephyr.modules; [
+                mbedtls
+                hal_espressif
+              ];
+            extraPackages = with pkgs; [ esptool ];
+          };
+        devShells.default = devShells.zephyr;
+        formatter = pkgs.nixfmt;
+      });
+
+}

prj.conf

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+CONFIG_GPIO=y

src/main.c

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+/*
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/gpio.h>
+
+/* 1000 msec = 1 sec */
+#define SLEEP_TIME_MS   1000
+
+/* The devicetree node identifier for the "led0" alias. */
+#define LED0_NODE DT_ALIAS(led0)
+
+/*
+ * A build error on this line means your board is unsupported.
+ * See the sample documentation for information on how to fix this.
+ */
+static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(LED0_NODE, gpios);
+
+int main(void)
+{
+	int ret;
+
+	if (!gpio_is_ready_dt(&led)) {
+		return 0;
+	}
+
+	ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE);
+	if (ret < 0) {
+		return 0;
+	}
+
+	while (1) {
+		ret = gpio_pin_toggle_dt(&led);
+		if (ret < 0) {
+			return 0;
+		}
+		k_msleep(SLEEP_TIME_MS);
+	}
+	return 0;
+}
+