diff --git a/CMakeLists.txt b/CMakeLists.txt
index a1a9b1e..72a5574 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -35,6 +35,10 @@ cmake_minimum_required(VERSION 3.13)
 set(PICO_TINYUSB_PATH ${CMAKE_CURRENT_SOURCE_DIR}/lib/tinyusb)
 set(PIOUSB_PATH ${CMAKE_CURRENT_SOURCE_DIR}/lib/Pico-PIO-USB)
 
+set(UART_TX CACHE STRING "")
+set(UART_RX CACHE STRING "")
+set(UART CACHE STRING "")
+
 option(USE_SD "Build in SD support" OFF)
 set(SD_TX 3 CACHE STRING "SD SPI TX pin")
 set(SD_RX 4 CACHE STRING "SD SPI RX pin")
@@ -133,6 +137,16 @@ add_compile_definitions(PIN_USB_HOST_DM=${PIN_USB_HOST_DM})
 add_compile_definitions(PICO_DEFAULT_PIO_USB_DP_PIN=${PIN_USB_HOST_DP})
 add_compile_definitions(PICO_DEFAULT_PIO_USB_DM_PIN=${PIN_USB_HOST_DM})
 
+if (NOT UART STREQUAL "")
+  add_compile_definitions(PICO_DEFAULT_UART=${UART})
+endif()
+if (NOT UART_TX STREQUAL "")
+  add_compile_definitions(PICO_DEFAULT_UART_TX_PIN=${UART_TX})
+endif()
+if (NOT UART_RX STREQUAL "")
+  add_compile_definitions(PICO_DEFAULT_UART_RX_PIN=${UART_RX})
+endif()
+
 if (USE_PSRAM)
   add_compile_definitions(PIN_PSRAM_CS=${PSRAM_CS} USE_PSRAM=1)
 else()
diff --git a/fruitjam-build.sh b/fruitjam-build.sh
index 5c27d74..9e20a80 100755
--- a/fruitjam-build.sh
+++ b/fruitjam-build.sh
@@ -73,5 +73,6 @@ cmake -S . -B build_${TAG} \
     -DMEMSIZE=${MEMSIZE} \
     -DUSE_HSTX=1 \
     -DSD_TX=35 -DSD_RX=36 -DSD_SCK=34 -DSD_CS=39 -DUSE_SD=1 \
+    -DUART_TX=44 -DUART_RX=45 -DUART=0 \
     ${CMAKE_ARGS} "$@"
 make -C build_${TAG} -j$(nproc)