Initial work.

.gitignore

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+build/

.gitmodules

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+[submodule "zephyr-rust"]
+	path = zephyr-rust
+	url = https://github.com/tylerwhall/zephyr-rust.git

CMakeLists.txt

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+# Find Zephyr. This also loads Zephyr's build system.
+cmake_minimum_required(VERSION 3.13.1)
+find_package(Zephyr)
+
+get_filename_component(ZEPHYR_RUST ${CMAKE_CURRENT_SOURCE_DIR}/zephyr-rust ABSOLUTE)
+list(APPEND ZEPHYR_EXTRA_MODULES ${ZEPHYR_RUST})
+
+project(zmk)
+
+# Add your source file to the "app" target. This must come after
+# find_package(Zephyr) which defines the target.
+target_sources(app PRIVATE src/main.c)
+
+include(ExternalProject)
+
+# Add rust_example as a CMake target
+ExternalProject_Add(
+    zmk_crate
+    DOWNLOAD_COMMAND ""
+    CONFIGURE_COMMAND ""
+    BUILD_COMMAND cargo build --target thumbv7m-none-eabi COMMAND cargo build --release --target thumbv7m-none-eabi
+    BINARY_DIR "${CMAKE_SOURCE_DIR}/zmk"
+    INSTALL_COMMAND ""
+    BUILD_BYPRODUCTS "${CMAKE_SOURCE_DIR}/zmk/target/thumbv7m-none-eabi/release/libzmk.a"
+    LOG_BUILD ON)
+
+# Create a wrapper CMake library that our app can link with
+add_library(zmk_lib STATIC IMPORTED GLOBAL)
+add_dependencies(
+  zmk_lib
+  zmk_crate
+  )
+
+set_target_properties(zmk_lib PROPERTIES IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/zmk/target/thumbv7m-none-eabi/release/libzmk.a)
+# target_link_libraries(zmk_lib
+# debug "${CMAKE_SOURCE_DIR}/target/debug/zmk.a"
+# optimized "${CMAKE_SOURCE_DIR}/target/release/zmk.a")
+
+target_link_libraries(app PUBLIC zmk_lib)
+

src/main.c

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+/*
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <device.h>
+#include <devicetree.h>
+#include <drivers/gpio.h>
+
+#include "zmk_lib.h"
+
+/* 1000 msec = 1 sec */
+#define SLEEP_TIME_MS   1000
+
+/* The devicetree node identifier for the "led0" alias. */
+#define LED0_NODE DT_ALIAS(led0)
+
+#if DT_HAS_NODE(LED0_NODE)
+#define LED0	DT_GPIO_LABEL(LED0_NODE, gpios)
+#define PIN	DT_GPIO_PIN(LED0_NODE, gpios)
+#if DT_PHA_HAS_CELL(LED0_NODE, gpios, flags)
+#define FLAGS	DT_GPIO_FLAGS(LED0_NODE, gpios)
+#endif
+#else
+/* A build error here means your board isn't set up to blink an LED. */
+#error "Unsupported board: led0 devicetree alias is not defined"
+#define LED0	""
+#define PIN	0
+#endif
+
+#ifndef FLAGS
+#define FLAGS	0
+#endif
+
+
+void main(void)
+{
+	struct device *dev;
+	bool led_is_on = true;
+	int ret;
+
+	dev = device_get_binding(LED0);
+	if (dev == NULL) {
+		return;
+	}
+
+	ret = gpio_pin_configure(dev, PIN, GPIO_OUTPUT_ACTIVE | FLAGS);
+	if (ret < 0) {
+		return;
+	}
+
+	zmk_run();
+	// while (1) {
+		// gpio_pin_set(dev, PIN, (int)led_is_on);
+		// led_is_on = !led_is_on;
+		// k_msleep(SLEEP_TIME_MS);
+	// }
+}

src/zmk_lib.h

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+#ifndef ZMK_LIB_H
+#define ZMK_LIB_H
+
+void zmk_run(void);
+
+#endif
+

zephyr-rust

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+Subproject commit 78b433aa9e0255a719fb0c3c9ac303f3924c1348