diff --git a/flake.nix b/flake.nix
index 888c9a5..e785fb9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -26,6 +26,8 @@
             rootFileContent = builtins.readFile rootdir.outPath;
           in
           pkgs.lib.mkIf (rootFileContent != "") rootFileContent;
+
+        ocdInterface = mcu/tigard-swd.cfg;
       in
       {
         devenv.shells.mcu = {
@@ -34,6 +36,7 @@
           packages = with pkgs; [
             gnumake
             cmake
+            pkgsCross.arm-embedded.buildPackages.gdb # ARM one is broken
             gcc-arm-embedded
             python3
             picotool
@@ -43,6 +46,27 @@
           env = {
             PICO_SDK_PATH = "${pkgs.pico-sdk}/lib/pico-sdk";
           };
+
+          scripts = {
+            build.exec = ''
+              cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -D PICO_STDIO_SEMIHOSTING=1
+              cmake --build build --parallel
+            '';
+            build-rel.exec = ''
+              cmake -S . -B build-release -D CMAKE_BUILD_TYPE=Release
+              cmake --build build-release --parallel
+            '';
+            clean.exec = ''
+              rm -rf build/ build-release/
+            '';
+
+            ocd.exec = ''
+              openocd -f ${ocdInterface} -f target/rp2040.cfg
+            '';
+            gdb.exec = ''
+              arm-none-eabi-gdb -x .gdbinit build/qclk.elf
+            '';
+          };
         };
       };
     };
diff --git a/mcu/.gdbinit b/mcu/.gdbinit
new file mode 100644
index 0000000..e0da8fd
--- /dev/null
+++ b/mcu/.gdbinit
@@ -0,0 +1,4 @@
+target extended-remote localhost:3333
+monitor arm semihosting enable
+monitor reset init
+monitor debug_level -2
diff --git a/mcu/.gitignore b/mcu/.gitignore
index 84c048a..8898bd1 100644
--- a/mcu/.gitignore
+++ b/mcu/.gitignore
@@ -1 +1,2 @@
 /build/
+/build-release/
diff --git a/mcu/CMakeLists.txt b/mcu/CMakeLists.txt
index a73804c..4c8f2c9 100644
--- a/mcu/CMakeLists.txt
+++ b/mcu/CMakeLists.txt
@@ -6,14 +6,14 @@ include(pico_sdk_import.cmake)
 project(test_project C CXX ASM)
 set(CMAKE_C_STANDARD 11)
 set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_C_COMPILER_WORKS ON)
-set(CMAKE_CXX_COMPILER_WORKS ON)
 pico_sdk_init()
 
 add_executable(qclk
   main.c
 )
+
 pico_enable_stdio_usb(qclk 1)
-pico_enable_stdio_uart(qclk 1)
+pico_enable_stdio_uart(qclk 0)
+
 pico_add_extra_outputs(qclk)
 target_link_libraries(qclk pico_stdlib)
diff --git a/mcu/main.c b/mcu/main.c
index f36b163..98c45bd 100644
--- a/mcu/main.c
+++ b/mcu/main.c
@@ -1,13 +1,16 @@
 #include <stdio.h>
-#include "pico/stdlib.h"
+
 #include "hardware/gpio.h"
+#include "pico/stdlib.h"
 #include "pico/binary_info.h"
 
-const uint LED_PIN = 25;
+const uint PIN_DIGIT_BASE = 18;
+const uint PIN_SEGMENT_BASE = 2;
+
+const uint DIGITS = 4;
 
 int main() {
-  bi_decl(bi_program_description("This is a test binary."));
-  bi_decl(bi_1pin_with_name(LED_PIN, "On-board LED"));
+  bi_decl(bi_program_description("qCLK driver."));
 
   stdio_init_all();
 
diff --git a/mcu/tigard-swd.cfg b/mcu/tigard-swd.cfg
new file mode 100644
index 0000000..489d257
--- /dev/null
+++ b/mcu/tigard-swd.cfg
@@ -0,0 +1,8 @@
+adapter driver ftdi
+transport select swd
+ftdi_vid_pid 0x0403 0x6010
+ftdi_channel 1
+adapter speed 2000
+ftdi_layout_init 0x0028 0x002b
+ftdi_layout_signal SWD_EN -data 0
+ftdi_layout_signal nSRST -data 0x0020