diff --git a/.github/workflows/avr.yml b/.github/workflows/avr.yml
new file mode 100644
index 000000000..330d8a632
--- /dev/null
+++ b/.github/workflows/avr.yml
@@ -0,0 +1,58 @@
+name: Build firmware
+
+permissions:
+  contents: read
+  pull-requests: write
+  
+on:
+  workflow_call:
+    outputs:
+      firstword:
+        description: the run-id of the workflow run
+        value: ${{ jobs.build-hex.outputs.output1 }}
+  workflow_dispatch:
+  push:
+
+
+jobs:
+  build-hex:
+    runs-on: ubuntu-latest
+    outputs:
+      output1: ${{ steps.step_get_run_id.outputs.RUN_ID }}
+    steps:
+    - name : Checkout repository
+      uses: actions/checkout@v4
+     
+    - name : make 01
+      uses: bazhenov/action-avr-make@v1.1
+      with:
+        dir: AVR_Code
+        target: '01'
+      env:
+        FIRMWARE_VERSION_ID: ${{ vars.AVR_VER }}
+
+    - name : make clean
+      uses: bazhenov/action-avr-make@v1.1
+      with:
+        dir: AVR_Code
+        target: clean_o_d
+
+    - name : make 02
+      uses: bazhenov/action-avr-make@v1.1
+      with:
+        dir: AVR_Code
+        target: '02'
+      env:
+        FIRMWARE_VERSION_ID: ${{ vars.AVR_VER }}
+
+    - name: Upload hex artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: asset-hex
+        path: AVR_Code/labrafirm*.hex
+        compression-level: 0
+        if-no-files-found: error
+
+    - name: Prepare workflow run ID output
+      id: step_get_run_id
+      run: echo "RUN_ID=${{ github.run_id }}" >> "$GITHUB_OUTPUT"
diff --git a/.github/workflows/continuous.yml b/.github/workflows/continuous.yml
index 18c3a4094..d225e5b98 100644
--- a/.github/workflows/continuous.yml
+++ b/.github/workflows/continuous.yml
@@ -8,27 +8,42 @@ on:
   workflow_dispatch:
 
 jobs:
-  build-android:
-    uses: ./.github/workflows/android.yml
-    secrets: inherit
-  build-linux:
-    uses: ./.github/workflows/linux.yml
+  build-avr:
+    uses: ./.github/workflows/avr.yml
     secrets: inherit
+#  build-android:
+#    uses: ./.github/workflows/android.yml
+#    secrets: inherit
+#    needs:
+#      - build-avr
+#   build-linux:
+#     uses: ./.github/workflows/linux.yml
+#     secrets: inherit
+#     needs:
+#       - build-avr
   build-mac:
+    needs:
+      - build-avr
     uses: ./.github/workflows/mac.yml
+    with:
+      AVR_RUN_ID: ${{ needs.build-avr.outputs.firstword }}
     secrets: inherit
-  build-windows:
-    uses: ./.github/workflows/windows.yml
-    secrets: inherit
+
+#  build-windows:
+#    uses: ./.github/workflows/windows.yml
+#    secrets: inherit
+#    needs:
+#      - build-avr
 
   release:
     permissions:
       contents: write
     needs:
-      - build-android
-      - build-linux
+      - build-avr
+#      - build-android
+#      - build-linux
       - build-mac
-      - build-windows
+#      - build-windows
     if: github.ref == 'refs/heads/master'
     runs-on: ubuntu-latest
     steps:
diff --git a/.github/workflows/mac.yml b/.github/workflows/mac.yml
index c74bd2c01..045a608d7 100644
--- a/.github/workflows/mac.yml
+++ b/.github/workflows/mac.yml
@@ -7,6 +7,10 @@ permissions:
 on:
   workflow_dispatch:
   workflow_call:
+    inputs:
+      AVR_RUN_ID:
+        required: true
+        type: string
   push:
   pull_request:
   
@@ -17,6 +21,42 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Download firmware from most recent continuous release
+        if: github.event.workflow != '.github/workflows/continuous.yml' 
+        run: |
+          mkdir asset-hex
+          HEX_URL=$(gh api graphql -f query='query {repository ( owner : "brentfpage", name: "Labrador") {release ( tagName: "continuous" ) {releaseAssets(first:10) {nodes {downloadUrl}}}}}' | jq -r '.data.repository.release.releaseAssets.nodes[] | select(.downloadUrl| test("02.hex")) | .[]')
+          wget --directory-prefix=asset-hex $HEX_URL
+        env:
+          GH_TOKEN: ${{ github.token }}
+
+# better alternative to the graphql query above would be to somehow retrieve the run-id of the most recent continuous.yml workflow run, then download the hex asset associated with the run-id using actions/download-artifact.
+# query description: get at most 10 assets from the most recent continuous release (assume there are fewer than 10), find the one that includes 02.hex in the download url
+# prettified (ish) query:
+# query {\
+#         repository ( owner : "espotek-org", name: "Labrador") {\
+#           release ( tagName: "continuous" ) {\
+#             releaseAssets(first:10) {\
+#               nodes {\
+#                 downloadUrl\
+#               }\
+#             }\
+#           }\
+#         }\
+#       }\
+# ' | jq -r '.data.repository.release.releaseAssets.nodes[] | select(.downloadUrl| test("02.hex")) | .[]'
+
+      - name: Download firmware from in-process continuous release
+        if: github.event.workflow == '.github/workflows/continuous.yml' 
+        uses: actions/download-artifact@v4
+        with:
+          run-id: ${{ inputs.AVR_RUN_ID }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: move firmware to appropriate directory
+        run: |
+          mv asset-hex/*02.hex Desktop_Interface/resources/firmware
+
       - name: Setup Homebrew dependencies
         run: |
           brew update
@@ -27,25 +67,28 @@ jobs:
       - name: Build librador
         working-directory: Librador_API/___librador/librador
         run: |
-          qmake -config release
+          qmake -config release EXPECTED_FIRMWARE_VERSION=${{ vars.AVR_VER }}
           make -j$(sysctl -n hw.ncpu)
 
       - name: Build librademo
         working-directory: Librador_API/___librador/librademo
         run: |
-          qmake -config release
+          qmake -config release EXPECTED_FIRMWARE_VERSION=${{ vars.AVR_VER }}
           make -j$(sysctl -n hw.ncpu)
 
       - name: Build basicdemo
         working-directory: Librador_API/___librador/basicdemo
         run: |
-          qmake -config release
+          qmake -config release EXPECTED_FIRMWARE_VERSION=${{ vars.AVR_VER }}
           make -j$(sysctl -n hw.ncpu)
 
       - name: Import code signing certificate
         env:
           MACOS_CERTIFICATE: ${{ secrets.MACOS_CERTIFICATE }}
           MACOS_CERTIFICATE_PWD: ${{ secrets.MACOS_CERTIFICATE_PWD }}
+        # secrets are only provided in original repo
+        if: env.MACOS_CERTIFICATE != '' && env.MACOS_CERTIFICATE_PWD != ''
+        working-directory: Desktop_Interface
         run: |
           # Create keychain
           KEYCHAIN_PATH=$RUNNER_TEMP/app-signing.keychain-db
@@ -67,12 +110,18 @@ jobs:
       - name: Build macOS app
         working-directory: Desktop_Interface
         run: |
-          qmake -config release
+          if ( env.MACOS_CERTIFICATE != '' && env.MACOS_CERTIFICATE_PWD != '' ); then
+            qmake -config release EXPECTED_FIRMWARE_VERSION=${{ vars.AVR_VER }}
+          else
+            # for debugging
+            qmake -config debug EXPECTED_FIRMWARE_VERSION=${{ vars.AVR_VER }}
+          fi
           make -j$(sysctl -n hw.ncpu)
           macdeployqt Labrador.app -verbose=2 -libpath=build_mac/libdfuprog/lib/
 
       - name: Code sign app bundle
         working-directory: Desktop_Interface
+        if: ( env.MACOS_CERTIFICATE != '' && env.MACOS_CERTIFICATE_PWD != '' )
         run: |
           # Find the signing identity
           IDENTITY=$(security find-identity -v -p codesigning | grep "Developer ID Application" | head -1 | awk -F'"' '{print $2}')
@@ -92,6 +141,7 @@ jobs:
 
       - name: Create and sign DMG
         working-directory: Desktop_Interface
+        if: ( env.MACOS_CERTIFICATE != '' && env.MACOS_CERTIFICATE_PWD != '' )
         run: |
           # Get the git hash for the filename
           GIT_HASH=$(git rev-parse --short HEAD)
@@ -122,6 +172,7 @@ jobs:
           APPLE_ID: ${{ secrets.APPLE_ID }}
           APPLE_ID_PASSWORD: ${{ secrets.APPLE_ID_PASSWORD }}
           APPLE_TEAM_ID: ${{ secrets.APPLE_TEAM_ID }}
+        if: ( env.MACOS_CERTIFICATE != '' && env.MACOS_CERTIFICATE_PWD != '' )  
         run: |
           GIT_HASH=$(git rev-parse --short HEAD)
           DMG_PATH="Labrador-${GIT_HASH}.dmg"
@@ -144,6 +195,7 @@ jobs:
           spctl -a -vvv -t install "$DMG_PATH"
 
       - name: Upload artifacts
+        if: ( env.MACOS_CERTIFICATE != '' && env.MACOS_CERTIFICATE_PWD != '' )  
         uses: actions/upload-artifact@v4
         with:
           name: asset-dmg
diff --git a/AVR_Code/Makefile b/AVR_Code/Makefile
new file mode 100755
index 000000000..72bba7866
--- /dev/null
+++ b/AVR_Code/Makefile
@@ -0,0 +1,249 @@
+# see https://github.com/espotek-org/Labrador/wiki/Building-from-source#building-the-firmware
+# Usage :
+# make 01
+# 	build a version of the firmware compatible with Windows x64 OSs
+# make 02
+# 	build a version of the firmware compatible with all other OSs
+# Here, OS refers to that of the machine with which the Labrador board will interface.
+# After running 'make 01', to switch to building variant 02 instead, first run 'make clean'.
+# The same goes for switching from building the 02 variant to building the 01 variant.
+# Some details:
+# 	In the build process for variant 01, the macro SINGLE_ENDPOINT_INTERFACE
+# 	is undefined, while in the build process for variant 02,
+# 	SINGLE_ENDPOINT_INTERFACE is defined.  In several regions of the source
+# 	code, the undefined/defined status of this macro determines which of two
+# 	possible code blocks are compiled into the firmware.  The collective effect
+# 	of having SINGLE_ENDPOINT_INTERFACE defined is to "change the headers so
+# 	that it uses 1x 1023-byte isochronous endpoint, rather than 6x 128-byte
+# 	endpoints to send the scope/logic analyzer data" (from
+# 	https://github.com/espotek-org/Labrador/issues/260)
+# *NOTE* : there is a commented-out line defining SINGLE_ENDPOINT_INTERFACE in
+# globals.h.  If it is uncommented, both 'make 01' and 'make 02' will
+# produce variant 02.  Further, 'make 01' will mislabel the firmware with
+# the suffix 01.  It is recommended that this line in globals.h be left
+# commented-out, which ensures that `make 01` and `make 02` work as
+# expected.
+LIB_DEP :=
+LIBS :=
+USER_OBJS :=
+OUTPUT_FILE_PATH :=
+OUTPUT_FILE_PATH =$(NAME).elf
+OUTPUT_FILE_PATH_AS_ARGS +=$(NAME).elf
+AVR_APP_PATH :=$$$AVR_APP_PATH$$$
+
+CC=avr-gcc
+SRC_DIR=./USB_BULK_TEST/src
+
+INCLUDES=-I"$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained" -I"$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/example" -I"$(SRC_DIR)/ASF/common/services/usb/udc" -I"$(SRC_DIR)/ASF/xmega/drivers/nvm" -I"$(SRC_DIR)/ASF/common/services/sleepmgr" -I"$(SRC_DIR)/ASF/common/services/clock" -I"$(SRC_DIR)/ASF/xmega/drivers/sleep" -I"$(SRC_DIR)/ASF/xmega/drivers/usb" -I"$(SRC_DIR)/ASF/xmega/drivers/cpu" -I"$(SRC_DIR)/ASF/common/services/usb/class/vendor" -I"$(SRC_DIR)/ASF/common/services/usb/class/vendor/device" -I"$(SRC_DIR)/ASF/common/services/usb" -I"$(SRC_DIR)mon/applications/user_application/user_board/config" -I"$(SRC_DIR)/ASF/xmega/utils" -I"$(SRC_DIR)/config" -I"$(SRC_DIR)/ASF/common/boards" -I"$(SRC_DIR)/ASF/xmega/utils/preprocessor" -I"$(SRC_DIR)/ASF/common/utils" -I"$(SRC_DIR)" -I"$(SRC_DIR)/ASF/common/boards/user_board" -I"$(SRC_DIR)/ASF/common/services/ioport"
+
+CFLAGS=-std=gnu99 -ffunction-sections -mmcu=atxmega32a4u -fsigned-char -funsigned-bitfields -fdata-sections -fshort-enums -fno-strict-aliasing -fno-jump-tables -fpack-struct -Wall -O2 -MD -MP -MF "$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -MT"$(@:%.o=%.o)" -DFIRMWARE_VERSION_ID=$(FIRMWARE_VERSION_ID)
+
+SHORT_FIRMWARE_VERSION_ID := $(shell fv='$(FIRMWARE_VERSION_ID)'; echo "$${fv:2:4}")
+NAME=labrafirm_$(SHORT_FIRMWARE_VERSION_ID)_$(SUFFIX)
+
+OBJS += \
+$(SRC_DIR)/tiny_calibration.o \
+$(SRC_DIR)/tiny_dig.o \
+$(SRC_DIR)/tiny_eeprom.o \
+$(SRC_DIR)/ASF/common/boards/user_board/init.o \
+$(SRC_DIR)/ASF/common/services/ioport/xmega/ioport_compat.o \
+$(SRC_DIR)/main.o \
+$(SRC_DIR)/tiny_adc.o \
+$(SRC_DIR)/tiny_dac.o \
+$(SRC_DIR)/tiny_dma.o \
+$(SRC_DIR)/tiny_timer.o \
+$(SRC_DIR)/tiny_uart.o \
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained/ui.o \
+$(SRC_DIR)/ASF/common/services/clock/xmega/sysclk.o \
+$(SRC_DIR)/ASF/common/services/sleepmgr/xmega/sleepmgr.o \
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/udi_vendor.o \
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/udi_vendor_desc.o \
+$(SRC_DIR)/ASF/common/services/usb/udc/udc.o \
+$(SRC_DIR)/ASF/xmega/drivers/nvm/nvm.o \
+$(SRC_DIR)/ASF/xmega/drivers/nvm/nvm_asm.o \
+$(SRC_DIR)/ASF/xmega/drivers/cpu/ccp.o \
+$(SRC_DIR)/ASF/xmega/drivers/usb/usb_device.o
+
+C_DEPS_AS_ARGS += \
+$(SRC_DIR)/tiny_calibration.d \
+$(SRC_DIR)/tiny_dig.d \
+$(SRC_DIR)/tiny_eeprom.d \
+$(SRC_DIR)/ASF/common/boards/user_board/init.d \
+$(SRC_DIR)/ASF/common/services/ioport/xmega/ioport_compat.d \
+$(SRC_DIR)/main.d \
+$(SRC_DIR)/tiny_adc.d \
+$(SRC_DIR)/tiny_dac.d \
+$(SRC_DIR)/tiny_dma.d \
+$(SRC_DIR)/tiny_timer.d \
+$(SRC_DIR)/tiny_uart.d \
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained/ui.d \
+$(SRC_DIR)/ASF/common/services/clock/xmega/sysclk.d \
+$(SRC_DIR)/ASF/common/services/sleepmgr/xmega/sleepmgr.d \
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/udi_vendor.d \
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/udi_vendor_desc.d \
+$(SRC_DIR)/ASF/common/services/usb/udc/udc.d \
+$(SRC_DIR)/ASF/xmega/drivers/nvm/nvm.d \
+$(SRC_DIR)/ASF/xmega/drivers/nvm/nvm_asm.d \
+$(SRC_DIR)/ASF/xmega/drivers/cpu/ccp.d \
+$(SRC_DIR)/ASF/xmega/drivers/usb/usb_device.d
+
+OBJS_AS_ARGS += \
+$(SRC_DIR)/tiny_calibration.o \
+$(SRC_DIR)/tiny_dig.o \
+$(SRC_DIR)/tiny_eeprom.o \
+$(SRC_DIR)/ASF/common/boards/user_board/init.o \
+$(SRC_DIR)/ASF/common/services/ioport/xmega/ioport_compat.o \
+$(SRC_DIR)/main.o \
+$(SRC_DIR)/tiny_adc.o \
+$(SRC_DIR)/tiny_dac.o \
+$(SRC_DIR)/tiny_dma.o \
+$(SRC_DIR)/tiny_timer.o \
+$(SRC_DIR)/tiny_uart.o \
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained/ui.o \
+$(SRC_DIR)/ASF/common/services/clock/xmega/sysclk.o \
+$(SRC_DIR)/ASF/common/services/sleepmgr/xmega/sleepmgr.o \
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/udi_vendor.o \
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/udi_vendor_desc.o \
+$(SRC_DIR)/ASF/common/services/usb/udc/udc.o \
+$(SRC_DIR)/ASF/xmega/drivers/nvm/nvm.o \
+$(SRC_DIR)/ASF/xmega/drivers/nvm/nvm_asm.o \
+$(SRC_DIR)/ASF/xmega/drivers/cpu/ccp.o \
+$(SRC_DIR)/ASF/xmega/drivers/usb/usb_device.o
+
+01: SUFFIX=01
+01: $(OUTPUT_FILE_PATH)
+	@echo NAME:$(NAME)
+	@echo CFLAGS:$(CFLAGS)
+
+02: CFLAGS+=-DSINGLE_ENDPOINT_INTERFACE
+02: SUFFIX=02
+02: $(OUTPUT_FILE_PATH)
+	@echo NAME:$(NAME)
+	@echo CFLAGS:$(CFLAGS)
+
+$(SRC_DIR)/tiny_calibration.o: $(SRC_DIR)/tiny_calibration.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/tiny_dig.o: $(SRC_DIR)/tiny_dig.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/tiny_eeprom.o: $(SRC_DIR)/tiny_eeprom.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/common/boards/user_board/init.o: $(SRC_DIR)/ASF/common/boards/user_board/init.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/common/services/ioport/xmega/ioport_compat.o: $(SRC_DIR)/ASF/common/services/ioport/xmega/ioport_compat.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/main.o: $(SRC_DIR)/main.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/tiny_adc.o: $(SRC_DIR)/tiny_adc.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/tiny_dac.o: $(SRC_DIR)/tiny_dac.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/tiny_dma.o: $(SRC_DIR)/tiny_dma.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/tiny_timer.o: $(SRC_DIR)/tiny_timer.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/tiny_uart.o: $(SRC_DIR)/tiny_uart.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained/ui.o: $(SRC_DIR)/ASF/common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained/ui.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/common/services/clock/xmega/sysclk.o: $(SRC_DIR)/ASF/common/services/clock/xmega/sysclk.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/common/services/sleepmgr/xmega/sleepmgr.o: $(SRC_DIR)/ASF/common/services/sleepmgr/xmega/sleepmgr.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/udi_vendor.o: $(SRC_DIR)/ASF/common/services/usb/class/vendor/device/udi_vendor.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/common/services/usb/class/vendor/device/udi_vendor_desc.o: $(SRC_DIR)/ASF/common/services/usb/class/vendor/device/udi_vendor_desc.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/common/services/usb/udc/udc.o: $(SRC_DIR)/ASF/common/services/usb/udc/udc.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/xmega/drivers/cpu/ccp.o: $(SRC_DIR)/ASF/xmega/drivers/cpu/ccp.s
+	@echo Building file: $<
+	@$(CC) -x assembler-with-cpp -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/xmega/drivers/nvm/nvm.o: $(SRC_DIR)/ASF/xmega/drivers/nvm/nvm.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/xmega/drivers/nvm/nvm_asm.o: $(SRC_DIR)/ASF/xmega/drivers/nvm/nvm_asm.s
+	@echo Building file: $<
+	@$(CC) -x assembler-with-cpp -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(SRC_DIR)/ASF/xmega/drivers/usb/usb_device.o: $(SRC_DIR)/ASF/xmega/drivers/usb/usb_device.c
+	@echo Building file: $<
+	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
+	@echo Finished building: $<
+
+$(OUTPUT_FILE_PATH): $(OBJS) $(USER_OBJS) $(OUTPUT_FILE_DEP) $(LIB_DEP) $(LINKER_SCRIPT_DEP)
+	@echo Building target: $@
+	$(CC) -o$(OUTPUT_FILE_PATH_AS_ARGS) $(OBJS_AS_ARGS) $(USER_OBJS) $(LIBS) -Wl,-Map=$(NAME)".map"  -Wl,-lm -mmcu=atxmega32a4u -Wl,--gc-sections -Wl,--relax 
+	avr-objcopy -O ihex -R .eeprom -R .fuse -R .lock -R .signature  $(NAME)".elf" $(NAME)".hex"
+	avr-objdump -h -S $(NAME)".elf" > $(NAME)".lss"
+	avr-objcopy -j .eeprom --set-section-flags=.eeprom=alloc,load --change-section-lma .eeprom=0 --no-change-warnings -O binary $(NAME)".elf" $(NAME)".eep" || exit 0
+	avr-objcopy -O srec -R .eeprom -R .fuse -R .lock -R .signature  $(NAME)".elf" $(NAME)".srec"
+	avr-size $(NAME)".elf"
+	@echo Finished successfully: $(NAME)
+
+clean_o_d :
+	-rm -rf $(OBJS_AS_ARGS)
+	-rm -rf $(C_DEPS_AS_ARGS)
+VARIANTS = 01 02
+clean : clean_o_d
+	$(foreach SUFFIX,$(VARIANTS), \
+		rm -rf $(NAME).hex ; \
+		rm -rf $(NAME).lss ; \
+		rm -rf $(NAME).eep ; \
+		rm -rf $(NAME).srec ; \
+		rm -rf $(NAME).elf $(NAME).a $(NAME).map)
diff --git a/AVR_Code/USB_BULK_TEST/Makefile b/AVR_Code/USB_BULK_TEST/Makefile
deleted file mode 100755
index d14e3a548..000000000
--- a/AVR_Code/USB_BULK_TEST/Makefile
+++ /dev/null
@@ -1,242 +0,0 @@
-# see https://github.com/espotek-org/Labrador/wiki/Building-from-source#building-the-firmware
-# Usage :
-# make 0x01
-# 	build a version of the firmware compatible with Windows x64 OSs
-# make 0x02
-# 	build a version of the firmware compatible with all other OSs
-# Here, OS refers to that of the machine with which the Labrador board will interface.
-# After running 'make 0x01', to switch to building variant 0x02 instead, first run 'make clean'.
-# The same goes for switching from building the 0x02 variant to building the 0x01 variant.
-# Some details:
-# 	In the build process for variant 0x01, the macro SINGLE_ENDPOINT_INTERFACE
-# 	is undefined, while in the build process for variant 0x02,
-# 	SINGLE_ENDPOINT_INTERFACE is defined.  In several regions of the source
-# 	code, the undefined/defined status of this macro determines which of two
-# 	possible code blocks are compiled into the firmware.  The collective effect
-# 	of having SINGLE_ENDPOINT_INTERFACE defined is to "change the headers so
-# 	that it uses 1x 1023-byte isochronous endpoint, rather than 6x 128-byte
-# 	endpoints to send the scope/logic analyzer data" (from
-# 	https://github.com/espotek-org/Labrador/issues/260)
-# *NOTE* : there is a commented-out line defining SINGLE_ENDPOINT_INTERFACE in
-# globals.h.  If it is uncommented, both 'make 0x01' and 'make 0x02' will
-# produce variant 0x02.  Further, 'make 0x01' will mislabel the firmware with
-# the suffix 0x01.  It is recommended that this line in globals.h be left
-# commented-out, which ensures that `make 0x01` and `make 0x02` work as
-# expected.
-EXECUTABLES :=
-LIB_DEP :=
-LIBS :=
-USER_OBJS :=
-OUTPUT_FILE_PATH :=
-OUTPUT_FILE_PATH =$(NAME).elf
-OUTPUT_FILE_PATH_AS_ARGS +=$(NAME).elf
-AVR_APP_PATH :=$$$AVR_APP_PATH$$$
-
-AVRDIR=
-CC=$(AVRDIR)/bin/avr-gcc
-INCLUDES=-I"./common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained" -I"./common/services/usb/class/vendor/device/example" -I"./src/ASF/common/services/usb/udc" -I"./src/ASF/xmega/drivers/nvm" -I"./src/ASF/common/services/sleepmgr" -I"./src/ASF/common/services/clock" -I"./src/ASF/xmega/drivers/sleep" -I"./src/ASF/xmega/drivers/usb" -I"./src/ASF/xmega/drivers/cpu" -I"./src/ASF/common/services/usb/class/vendor" -I"./src/ASF/common/services/usb/class/vendor/device" -I"./src/ASF/common/services/usb" -I"./common/applications/user_application/user_board/config" -I"./src/ASF/xmega/utils" -I"./src/config" -I"./src/ASF/common/boards" -I"./src/ASF/xmega/utils/preprocessor" -I"./src/ASF/common/utils" -I"./src" -I"./src/ASF/common/boards/user_board" -I"./src/ASF/common/services/ioport"
-
-CFLAGS=-std=gnu99 -ffunction-sections -mmcu=atxmega32a4u -fsigned-char -funsigned-bitfields -fdata-sections -fshort-enums -fno-strict-aliasing -fno-jump-tables -fpack-struct -Wall -O2 -MD -MP -MF "$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -MT"$(@:%.o=%.o)" 
-NAME=labrafirm_$(SUFFIX)
-
-OBJS += \
-./src/tiny_calibration.o \
-./src/tiny_dig.o \
-./src/tiny_eeprom.o \
-./src/ASF/common/boards/user_board/init.o \
-./src/ASF/common/services/ioport/xmega/ioport_compat.o \
-./src/main.o \
-./src/tiny_adc.o \
-./src/tiny_dac.o \
-./src/tiny_dma.o \
-./src/tiny_timer.o \
-./src/tiny_uart.o \
-./src/ASF/common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained/ui.o \
-./src/ASF/common/services/clock/xmega/sysclk.o \
-./src/ASF/common/services/sleepmgr/xmega/sleepmgr.o \
-./src/ASF/common/services/usb/class/vendor/device/udi_vendor.o \
-./src/ASF/common/services/usb/class/vendor/device/udi_vendor_desc.o \
-./src/ASF/common/services/usb/udc/udc.o \
-./src/ASF/xmega/drivers/nvm/nvm.o \
-./src/ASF/xmega/drivers/nvm/nvm_asm.o \
-./src/ASF/xmega/drivers/cpu/ccp.o \
-./src/ASF/xmega/drivers/usb/usb_device.o
-
-C_DEPS_AS_ARGS += \
-./src/tiny_calibration.d \
-./src/tiny_dig.d \
-./src/tiny_eeprom.d \
-./src/ASF/common/boards/user_board/init.d \
-./src/ASF/common/services/ioport/xmega/ioport_compat.d \
-./src/main.d \
-./src/tiny_adc.d \
-./src/tiny_dac.d \
-./src/tiny_dma.d \
-./src/tiny_timer.d \
-./src/tiny_uart.d \
-./src/ASF/common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained/ui.d \
-./src/ASF/common/services/clock/xmega/sysclk.d \
-./src/ASF/common/services/sleepmgr/xmega/sleepmgr.d \
-./src/ASF/common/services/usb/class/vendor/device/udi_vendor.d \
-./src/ASF/common/services/usb/class/vendor/device/udi_vendor_desc.d \
-./src/ASF/common/services/usb/udc/udc.d \
-./src/ASF/xmega/drivers/nvm/nvm.d \
-./src/ASF/xmega/drivers/nvm/nvm_asm.d \
-./src/ASF/xmega/drivers/cpu/ccp.d \
-./src/ASF/xmega/drivers/usb/usb_device.d
-
-OBJS_AS_ARGS += \
-./src/tiny_calibration.o \
-./src/tiny_dig.o \
-./src/tiny_eeprom.o \
-./src/ASF/common/boards/user_board/init.o \
-./src/ASF/common/services/ioport/xmega/ioport_compat.o \
-./src/main.o \
-./src/tiny_adc.o \
-./src/tiny_dac.o \
-./src/tiny_dma.o \
-./src/tiny_timer.o \
-./src/tiny_uart.o \
-./src/ASF/common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained/ui.o \
-./src/ASF/common/services/clock/xmega/sysclk.o \
-./src/ASF/common/services/sleepmgr/xmega/sleepmgr.o \
-./src/ASF/common/services/usb/class/vendor/device/udi_vendor.o \
-./src/ASF/common/services/usb/class/vendor/device/udi_vendor_desc.o \
-./src/ASF/common/services/usb/udc/udc.o \
-./src/ASF/xmega/drivers/nvm/nvm.o \
-./src/ASF/xmega/drivers/nvm/nvm_asm.o \
-./src/ASF/xmega/drivers/cpu/ccp.o \
-./src/ASF/xmega/drivers/usb/usb_device.o
-
-./src/tiny_calibration.o: ./src/tiny_calibration.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/tiny_dig.o: ./src/tiny_dig.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/tiny_eeprom.o: ./src/tiny_eeprom.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/common/boards/user_board/init.o: ./src/ASF/common/boards/user_board/init.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/common/services/ioport/xmega/ioport_compat.o: ./src/ASF/common/services/ioport/xmega/ioport_compat.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/main.o: ./src/main.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/tiny_adc.o: ./src/tiny_adc.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/tiny_dac.o: ./src/tiny_dac.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/tiny_dma.o: ./src/tiny_dma.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/tiny_timer.o: ./src/tiny_timer.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/tiny_uart.o: ./src/tiny_uart.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained/ui.o: ./src/ASF/common/services/usb/class/vendor/device/example/atxmega256a3bu_xmega_a3bu_xplained/ui.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/common/services/clock/xmega/sysclk.o: ./src/ASF/common/services/clock/xmega/sysclk.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/common/services/sleepmgr/xmega/sleepmgr.o: ./src/ASF/common/services/sleepmgr/xmega/sleepmgr.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/common/services/usb/class/vendor/device/udi_vendor.o: ./src/ASF/common/services/usb/class/vendor/device/udi_vendor.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/common/services/usb/class/vendor/device/udi_vendor_desc.o: ./src/ASF/common/services/usb/class/vendor/device/udi_vendor_desc.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/common/services/usb/udc/udc.o: ./src/ASF/common/services/usb/udc/udc.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/xmega/drivers/cpu/ccp.o: ./src/ASF/xmega/drivers/cpu/ccp.s
-	@echo Building file: $<
-	@$(CC) -x assembler-with-cpp -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/xmega/drivers/nvm/nvm.o: ./src/ASF/xmega/drivers/nvm/nvm.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/xmega/drivers/nvm/nvm_asm.o: ./src/ASF/xmega/drivers/nvm/nvm_asm.s
-	@echo Building file: $<
-	@$(CC) -x assembler-with-cpp -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-./src/ASF/xmega/drivers/usb/usb_device.o: ./src/ASF/xmega/drivers/usb/usb_device.c
-	@echo Building file: $<
-	@$(CC) -DNDEBUG -DBOARD=USER_BOARD $(INCLUDES) $(CFLAGS) -c -o "$@" "$<" 
-	@echo Finished building: $<
-
-0x01: SUFFIX=0x01
-0x01: $(OUTPUT_FILE_PATH)
-
-0x02: CFLAGS+=-DSINGLE_ENDPOINT_INTERFACE
-0x02: SUFFIX=0x02
-0x02: $(OUTPUT_FILE_PATH)
-
-$(OUTPUT_FILE_PATH): $(OBJS) $(USER_OBJS) $(OUTPUT_FILE_DEP) $(LIB_DEP) $(LINKER_SCRIPT_DEP)
-	@echo Building target: $@
-	$(CC) -o$(OUTPUT_FILE_PATH_AS_ARGS) $(OBJS_AS_ARGS) $(USER_OBJS) $(LIBS) -Wl,-Map=$(NAME)".map"  -Wl,-lm -mmcu=atxmega32a4u -Wl,--gc-sections -Wl,--relax 
-	$(AVRDIR)/bin/avr-objcopy -O ihex -R .eeprom -R .fuse -R .lock -R .signature  $(NAME)".elf" $(NAME)".hex"
-	$(AVRDIR)/bin/avr-objdump -h -S $(NAME)".elf" > $(NAME)".lss"
-	$(AVRDIR)/bin/avr-objcopy -j .eeprom --set-section-flags=.eeprom=alloc,load --change-section-lma .eeprom=0 --no-change-warnings -O binary $(NAME)".elf" $(NAME)".eep" || exit 0
-	$(AVRDIR)/bin/avr-objcopy -O srec -R .eeprom -R .fuse -R .lock -R .signature  $(NAME)".elf" $(NAME)".srec"
-	$(AVRDIR)/bin/avr-size $(NAME)".elf"
-	@echo Finished successfully: $(NAME)
-
-VARIANTS = 0x01 0x02
-clean :
-	-rm -rf $(OBJS_AS_ARGS) $(EXECUTABLES)
-	-rm -rf $(C_DEPS_AS_ARGS)
-	$(foreach SUFFIX,$(VARIANTS), \
-		rm -rf $(NAME).hex ; \
-		rm -rf $(NAME).lss ; \
-		rm -rf $(NAME).eep ; \
-		rm -rf $(NAME).srec ; \
-		rm -rf $(NAME).elf $(NAME).a $(NAME).map)
diff --git a/AVR_Code/USB_BULK_TEST/src/ASF/common/services/usb/udc/udc.c b/AVR_Code/USB_BULK_TEST/src/ASF/common/services/usb/udc/udc.c
index 123928a27..bdb4bfb32 100644
--- a/AVR_Code/USB_BULK_TEST/src/ASF/common/services/usb/udc/udc.c
+++ b/AVR_Code/USB_BULK_TEST/src/ASF/common/services/usb/udc/udc.c
@@ -1102,7 +1102,7 @@ static bool udc_reqvend(void){
 			uds.calValPos = cali_value_positive_gradient;
 			uds.CALA = DFLLRC2M.CALA;
 			uds.CALB = DFLLRC2M.CALB;
-			udd_set_setup_payload(&uds, udd_g_ctrlreq.req.wLength);
+			udd_set_setup_payload((uint8_t *) &uds, udd_g_ctrlreq.req.wLength);
 			//asm("nop");
 			return 1;
 		case 0xa1: //Receive waveform for signal gen
@@ -1212,7 +1212,7 @@ static bool udc_reqvend(void){
 			    : "memory");
 			    __builtin_unreachable();
 		case 0xa8:  //Firmware Version Request
-			udd_set_setup_payload(&firmver, udd_g_ctrlreq.req.wLength);
+			udd_set_setup_payload((uint8_t *) &firmver, udd_g_ctrlreq.req.wLength);
 			return 1;	
 		case 0xa9:  //Variant Version Request
 			udd_set_setup_payload(&variant, udd_g_ctrlreq.req.wLength);
diff --git a/AVR_Code/USB_BULK_TEST/src/ASF/xmega/drivers/usb/usb_device.c b/AVR_Code/USB_BULK_TEST/src/ASF/xmega/drivers/usb/usb_device.c
index a0b77ded8..5d21fd567 100644
--- a/AVR_Code/USB_BULK_TEST/src/ASF/xmega/drivers/usb/usb_device.c
+++ b/AVR_Code/USB_BULK_TEST/src/ASF/xmega/drivers/usb/usb_device.c
@@ -249,7 +249,7 @@ static UDD_EP_t *udd_ep_get_ctrl(udd_ep_id_t ep);
 //@{
 
 //! Global variable to give and record information about setup request management
-udd_ctrl_request_t udd_g_ctrlreq;
+extern udd_ctrl_request_t udd_g_ctrlreq;
 
 //! Bit definitions about endpoint control state machine for udd_ep_control_state
 typedef enum {
diff --git a/AVR_Code/USB_BULK_TEST/src/globals.h b/AVR_Code/USB_BULK_TEST/src/globals.h
index e85cc0b87..f2c00e808 100644
--- a/AVR_Code/USB_BULK_TEST/src/globals.h
+++ b/AVR_Code/USB_BULK_TEST/src/globals.h
@@ -13,7 +13,7 @@
 
 //#define VERO
 #define OVERCLOCK 48
-#define FIRMWARE_VERSION_ID 0x0007
+// #define FIRMWARE_VERSION_ID 0x0007
 #define ATMEL_DFU_OFFSET 0x01fc
 
 #define TC_SPISLAVE TCD0
@@ -71,4 +71,4 @@ extern const unsigned char variant;
 #include "unified_debug_structure.h"
 extern unified_debug uds;
 
-#endif /* GLOBALS_H_ */
\ No newline at end of file
+#endif /* GLOBALS_H_ */
diff --git a/AVR_Code/USB_BULK_TEST/src/tiny_calibration.c b/AVR_Code/USB_BULK_TEST/src/tiny_calibration.c
index a1ac1c4c9..64374af8a 100644
--- a/AVR_Code/USB_BULK_TEST/src/tiny_calibration.c
+++ b/AVR_Code/USB_BULK_TEST/src/tiny_calibration.c
@@ -10,6 +10,8 @@
 #include "tiny_adc.h"
 
 volatile unsigned char median_TRFCNT_delay = 255;
+volatile unsigned char cali_value_positive_gradient;
+volatile unsigned char cali_value_negative_gradient;
 
 void tiny_calibration_init(){
 		//Set up 48MHz DFLL for USB.
@@ -46,7 +48,7 @@ void tiny_calibration_init(){
 		return;
 }
 
-tiny_calibration_first_sof(){
+void tiny_calibration_first_sof(){
 		PR.PRPE &= 0b11111110;
 		TC_CALI.PER = 23999;
 		TC_CALI.CNT = 12000;
diff --git a/AVR_Code/USB_BULK_TEST/src/tiny_calibration.h b/AVR_Code/USB_BULK_TEST/src/tiny_calibration.h
index edd9e0f35..1e580a9ad 100644
--- a/AVR_Code/USB_BULK_TEST/src/tiny_calibration.h
+++ b/AVR_Code/USB_BULK_TEST/src/tiny_calibration.h
@@ -25,8 +25,8 @@ void tiny_calibration_synchronise_phase(unsigned int phase, unsigned int precisi
 extern volatile unsigned char calibration_values_found;
 extern volatile unsigned char median_TRFCNT_delay;
 
-volatile unsigned char cali_value_negative_gradient;
-volatile unsigned char cali_value_positive_gradient;
+extern volatile unsigned char cali_value_negative_gradient;
+extern volatile unsigned char cali_value_positive_gradient;
 
 
-#endif /* TINY_CALIBRATION_H_ */
\ No newline at end of file
+#endif /* TINY_CALIBRATION_H_ */
diff --git a/Desktop_Interface/Labrador.pro b/Desktop_Interface/Labrador.pro
index fc6d1b480..77659350f 100644
--- a/Desktop_Interface/Labrador.pro
+++ b/Desktop_Interface/Labrador.pro
@@ -32,6 +32,8 @@ equals(QCP_VER,"2"){
     message("Using QCP2 with OpenGL support")
 }
 
+DEFINES += "EXPECTED_FIRMWARE_VERSION=$${EXPECTED_FIRMWARE_VERSION}"
+
 include(ui_elements.pri)
 
 MOC_DIR = moc
diff --git a/Desktop_Interface/genericusbdriver.h b/Desktop_Interface/genericusbdriver.h
index 95dcc7a57..3407a9344 100644
--- a/Desktop_Interface/genericusbdriver.h
+++ b/Desktop_Interface/genericusbdriver.h
@@ -16,7 +16,7 @@
 //#include "buffercontrol.h"
 #include "unified_debug_structure.h"
 
-#define EXPECTED_FIRMWARE_VERSION 0x0007
+//#define EXPECTED_FIRMWARE_VERSION 0x0007
 
 #ifdef WINDOWS_64_BIT
     #define DEFINED_EXPECTED_VARIANT 1