diff --git a/.gitmodules b/.gitmodules
index 3f62356..8fa55e5 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -37,3 +37,6 @@
 [submodule "examples/rda5807m_test"]
 	path = examples/rda5807m_test
 	url = https://github.com/ccbruce0812/rda5807m_test.git
+[submodule "extras/mcpwm"]
+	path = extras/mcpwm
+	url = https://github.com/ccbruce0812/mcpwm.git
diff --git a/extras/mcpwm b/extras/mcpwm
new file mode 160000
index 0000000..d72f86f
--- /dev/null
+++ b/extras/mcpwm
@@ -0,0 +1 @@
+Subproject commit d72f86fba9a63c8e1a0b3bcd783fe11e04e77f70