diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..87e284e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "fw/ch32fun"]
+	path = fw/ch32fun
+	url = https://github.com/cnlohr/ch32fun
diff --git a/fw/.gitignore b/fw/.gitignore
new file mode 100644
index 0000000..5484688
--- /dev/null
+++ b/fw/.gitignore
@@ -0,0 +1,3 @@
+.zen
+.vscode
+.ccls-cache
diff --git a/fw/Makefile b/fw/Makefile
new file mode 100644
index 0000000..5501eb8
--- /dev/null
+++ b/fw/Makefile
@@ -0,0 +1,9 @@
+all : flash
+
+TARGET:=blink
+TARGET_MCU:=CH32X035
+
+include ch32fun/ch32fun/ch32fun.mk
+
+flash : cv_flash
+clean : cv_clean
diff --git a/fw/blink.c b/fw/blink.c
new file mode 100644
index 0000000..24f11e2
--- /dev/null
+++ b/fw/blink.c
@@ -0,0 +1,6 @@
+#include <ch32fun.h>
+
+int main(void) {
+	while(true);
+	return 0;
+}
diff --git a/fw/ch32fun b/fw/ch32fun
new file mode 160000
index 0000000..cfffff6
--- /dev/null
+++ b/fw/ch32fun
@@ -0,0 +1 @@
+Subproject commit cfffff6d6bd9bd97d7348d044a1de145f4548072
diff --git a/fw/funconfig.h b/fw/funconfig.h
new file mode 100644
index 0000000..d9342ae
--- /dev/null
+++ b/fw/funconfig.h
@@ -0,0 +1,5 @@
+#ifndef _FUNCONFIG_H
+#define _FUNCONFIG_H
+
+#endif
+