diff --git a/.gitmodules b/.gitmodules
index f2e3e70..60fe12a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "lib/tinyusb"]
 	path = lib/tinyusb
 	url = https://github.com/hathach/tinyusb
+[submodule "lib/pico-sdk"]
+	path = lib/pico-sdk
+	url = https://github.com/raspberrypi/pico-sdk.git
diff --git a/lib/pico-sdk b/lib/pico-sdk
new file mode 160000
index 0000000..6a7db34
--- /dev/null
+++ b/lib/pico-sdk
@@ -0,0 +1 @@
+Subproject commit 6a7db34ff63345a7badec79ebea3aaef1712f374