Add inital src and cmake

.gitignore

@@ -86,3 +86,6 @@ dkms.conf
 *.out
 *.app
 
+# Build and output
+_build
+build

CMakeLists.txt

@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+project(timer_fw)
+
+target_sources(app PRIVATE src/main.c)

prj.conf

@@ -0,0 +1,6 @@
+CONFIG_GPIO=y
+CONFIG_SERIAL=y
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+CONFIG_LOG=y
+CONFIG_LOG_DEFAULT_LEVEL=3

src/main.c

@@ -0,0 +1,16 @@
+#include <zephyr/kernel.h>
+#include <zephyr/logging/log.h>
+
+LOG_MODULE_REGISTER(timer_fw, LOG_LEVEL_INF);
+
+int main(void)
+{
+    LOG_INF("Timer firmware booted!");
+
+    while (1) {
+        LOG_INF("heartbeat");
+        k_sleep(K_SECONDS(5));
+    }
+
+    return 0;
+}