diff --git a/.gitignore b/.gitignore
index 299f53b..58ea3db 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,7 +45,6 @@
 *.bxml
 *.zip
 
-
 # Vivado project directories
 *.sim/
 *.cache/
@@ -65,6 +64,8 @@ vivado_pid*.str
 vivado*.backup.jou
 vivado*.backup.log
 
+# Directories to ignore
+.venv
 
 # SDK workspace
 .sdk/
@@ -79,4 +80,8 @@ vivado*.backup.log
 **/design/**/*.xdc
 
 # Other files
-**/test/*.zip
\ No newline at end of file
+**/test/*.zip
+**/test/*.exe
+**/test/*.spec
+**/test/dist/
+**/test/build/
\ No newline at end of file
diff --git a/LAB3/design/diligent_jstk/diligent_jstk.bd b/LAB3/design/diligent_jstk/diligent_jstk.bd
index d4628ee..1570bb4 100644
--- a/LAB3/design/diligent_jstk/diligent_jstk.bd
+++ b/LAB3/design/diligent_jstk/diligent_jstk.bd
@@ -591,13 +591,6 @@
       }
     },
     "interface_nets": {
-      "axi4stream_spi_master_0_M_AXIS": {
-        "interface_ports": [
-          "axi4stream_spi_master_0/M_AXIS",
-          "digilent_jstk2_0/s_axis",
-          "system_ila_0/SLOT_1_AXIS"
-        ]
-      },
       "AXI4Stream_UART_0_M00_AXIS_RX": {
         "interface_ports": [
           "AXI4Stream_UART_0/M00_AXIS_RX",
@@ -610,10 +603,17 @@
           "axi4stream_spi_master_0/SPI_M"
         ]
       },
-      "AXI4Stream_UART_0_UART": {
+      "axi4stream_spi_master_0_M_AXIS": {
         "interface_ports": [
-          "usb_uart",
-          "AXI4Stream_UART_0/UART"
+          "axi4stream_spi_master_0/M_AXIS",
+          "digilent_jstk2_0/s_axis",
+          "system_ila_0/SLOT_1_AXIS"
+        ]
+      },
+      "jstk_uart_bridge_0_m_axis": {
+        "interface_ports": [
+          "AXI4Stream_UART_0/S00_AXIS_TX",
+          "jstk_uart_bridge_0/m_axis"
         ]
       },
       "digilent_jstk2_0_m_axis": {
@@ -623,10 +623,10 @@
           "system_ila_0/SLOT_0_AXIS"
         ]
       },
-      "jstk_uart_bridge_0_m_axis": {
+      "AXI4Stream_UART_0_UART": {
         "interface_ports": [
-          "AXI4Stream_UART_0/S00_AXIS_TX",
-          "jstk_uart_bridge_0/m_axis"
+          "usb_uart",
+          "AXI4Stream_UART_0/UART"
         ]
       }
     },
diff --git a/LAB3/design/diligent_jstk/diligent_jstk.bda b/LAB3/design/diligent_jstk/diligent_jstk.bda
index 1612b92..aafae03 100644
--- a/LAB3/design/diligent_jstk/diligent_jstk.bda
+++ b/LAB3/design/diligent_jstk/diligent_jstk.bda
@@ -21,22 +21,22 @@
   <key attr.name="vert_type" attr.type="string" for="node" id="VT"/>
   <graph edgedefault="undirected" id="G" parse.edgeids="canonical" parse.nodeids="canonical" parse.order="nodesfirst">
     <node id="n0">
-      <data key="VM">diligent_jstk</data>
-      <data key="VT">BC</data>
-    </node>
-    <node id="n1">
-      <data key="TU">active</data>
-      <data key="VH">2</data>
-      <data key="VT">PM</data>
-    </node>
-    <node id="n2">
       <data key="VH">2</data>
       <data key="VM">diligent_jstk</data>
       <data key="VT">VR</data>
     </node>
-    <edge id="e0" source="n0" target="n2">
+    <node id="n1">
+      <data key="VM">diligent_jstk</data>
+      <data key="VT">BC</data>
+    </node>
+    <node id="n2">
+      <data key="TU">active</data>
+      <data key="VH">2</data>
+      <data key="VT">PM</data>
+    </node>
+    <edge id="e0" source="n1" target="n0">
     </edge>
-    <edge id="e1" source="n2" target="n1">
+    <edge id="e1" source="n0" target="n2">
     </edge>
   </graph>
 </graphml>
diff --git a/LAB3/design/diligent_jstk/hdl/diligent_jstk_wrapper.vhd b/LAB3/design/diligent_jstk/hdl/diligent_jstk_wrapper.vhd
index 39455a0..9d1328b 100644
--- a/LAB3/design/diligent_jstk/hdl/diligent_jstk_wrapper.vhd
+++ b/LAB3/design/diligent_jstk/hdl/diligent_jstk_wrapper.vhd
@@ -1,8 +1,8 @@
 --Copyright 1986-2020 Xilinx, Inc. All Rights Reserved.
 ----------------------------------------------------------------------------------
 --Tool Version: Vivado v.2020.2 (win64) Build 3064766 Wed Nov 18 09:12:45 MST 2020
---Date        : Mon May 19 09:11:39 2025
---Host        : Davide-Samsung running 64-bit major release  (build 9200)
+--Date        : Fri May 30 13:56:20 2025
+--Host        : DavideASUS running 64-bit major release  (build 9200)
 --Command     : generate_target diligent_jstk_wrapper.bd
 --Design      : diligent_jstk_wrapper
 --Purpose     : IP block netlist
@@ -29,8 +29,6 @@ architecture STRUCTURE of diligent_jstk_wrapper is
   port (
     reset : in STD_LOGIC;
     sys_clock : in STD_LOGIC;
-    usb_uart_txd : out STD_LOGIC;
-    usb_uart_rxd : in STD_LOGIC;
     SPI_M_0_sck_t : out STD_LOGIC;
     SPI_M_0_io1_o : out STD_LOGIC;
     SPI_M_0_ss_t : out STD_LOGIC;
@@ -42,7 +40,9 @@ architecture STRUCTURE of diligent_jstk_wrapper is
     SPI_M_0_sck_o : out STD_LOGIC;
     SPI_M_0_ss_i : in STD_LOGIC;
     SPI_M_0_io1_i : in STD_LOGIC;
-    SPI_M_0_io0_i : in STD_LOGIC
+    SPI_M_0_io0_i : in STD_LOGIC;
+    usb_uart_txd : out STD_LOGIC;
+    usb_uart_rxd : in STD_LOGIC
   );
   end component diligent_jstk;
   component IOBUF is
diff --git a/LAB3/test/uart_viewer.py b/LAB3/test/uart_viewer.py
index 59f0993..296882a 100644
--- a/LAB3/test/uart_viewer.py
+++ b/LAB3/test/uart_viewer.py
@@ -63,11 +63,11 @@ def receive_graph_mode(ser):
     # Load PNG directly
     png_path = r'LAB3\test\Color_circle_(RGB).png'
     img = Image.open(png_path).convert('RGB')
-    img = img.resize((127, 127), Image.LANCZOS)  # Ensure image is 127x127
+    img = img.resize((127, 127), Image.Resampling.LANCZOS)  # Ensure image is 127x127
     img_np = np.array(img)
 
     # Show the image as background
-    ax.imshow(img, extent=[0, 127, 0, 127], aspect='auto', zorder=0)
+    ax.imshow(img, extent=(0, 127, 0, 127), aspect='auto', zorder=0)
 
     sc = ax.scatter([point[0]], [point[1]], s=[size], zorder=1)
     ax.set_xlim(0, 127)
@@ -146,6 +146,7 @@ def send_mode(ser):
             print("\nChiusura modalità invio...")
             break
 
+ser = None
 try:
     mode = ""
     while mode not in ["r", "s", "g"]:
@@ -170,5 +171,5 @@ except KeyboardInterrupt:
 except serial.SerialException as e:
     print(f"Errore nella connessione seriale: {e}")
 finally:
-    if 'ser' in locals() and ser.is_open:
+    if ser is not None and ser.is_open:
         ser.close()
diff --git a/LAB3/vivado/diligent_jstk/diligent_jstk.xpr b/LAB3/vivado/diligent_jstk/diligent_jstk.xpr
index 6dbb0ee..b3d8a31 100644
--- a/LAB3/vivado/diligent_jstk/diligent_jstk.xpr
+++ b/LAB3/vivado/diligent_jstk/diligent_jstk.xpr
@@ -77,29 +77,48 @@
   <FileSets Version="1" Minor="31">
     <FileSet Name="sources_1" Type="DesignSrcs" RelSrcDir="$PSRCDIR/sources_1" RelGenDir="$PGENDIR/sources_1">
       <Filter Type="Srcs"/>
-      <File Path="$PPRDIR/../../design/diligent_jstk/diligent_jstk.bd">
-        <FileInfo>
-          <Attr Name="UsedIn" Val="synthesis"/>
-          <Attr Name="UsedIn" Val="implementation"/>
-          <Attr Name="UsedIn" Val="simulation"/>
-        </FileInfo>
-      </File>
-      <File Path="$PPRDIR/../../design/diligent_jstk/hdl/diligent_jstk_wrapper.vhd">
-        <FileInfo>
-          <Attr Name="UsedIn" Val="synthesis"/>
-          <Attr Name="UsedIn" Val="simulation"/>
-        </FileInfo>
-      </File>
       <File Path="$PPRDIR/../../src/jstk_uart_bridge.vhd">
         <FileInfo>
-          <Attr Name="AutoDisabled" Val="1"/>
           <Attr Name="UsedIn" Val="synthesis"/>
           <Attr Name="UsedIn" Val="simulation"/>
         </FileInfo>
       </File>
       <File Path="$PPRDIR/../../src/digilent_jstk2.vhd">
         <FileInfo>
-          <Attr Name="AutoDisabled" Val="1"/>
+          <Attr Name="UsedIn" Val="synthesis"/>
+          <Attr Name="UsedIn" Val="simulation"/>
+        </FileInfo>
+      </File>
+      <File Path="$PPRDIR/../../design/diligent_jstk/diligent_jstk.bd">
+        <FileInfo>
+          <Attr Name="UsedIn" Val="synthesis"/>
+          <Attr Name="UsedIn" Val="implementation"/>
+          <Attr Name="UsedIn" Val="simulation"/>
+        </FileInfo>
+        <CompFileExtendedInfo CompFileName="diligent_jstk.bd" FileRelPathName="ip/diligent_jstk_jstk_uart_bridge_0_0/diligent_jstk_jstk_uart_bridge_0_0.xci">
+          <Proxy FileSetName="diligent_jstk_jstk_uart_bridge_0_0"/>
+        </CompFileExtendedInfo>
+        <CompFileExtendedInfo CompFileName="diligent_jstk.bd" FileRelPathName="ip/diligent_jstk_clk_wiz_0_0/diligent_jstk_clk_wiz_0_0.xci">
+          <Proxy FileSetName="diligent_jstk_clk_wiz_0_0"/>
+        </CompFileExtendedInfo>
+        <CompFileExtendedInfo CompFileName="diligent_jstk.bd" FileRelPathName="ip/diligent_jstk_axi4stream_spi_master_0_0/diligent_jstk_axi4stream_spi_master_0_0.xci">
+          <Proxy FileSetName="diligent_jstk_axi4stream_spi_master_0_0"/>
+        </CompFileExtendedInfo>
+        <CompFileExtendedInfo CompFileName="diligent_jstk.bd" FileRelPathName="ip/diligent_jstk_digilent_jstk2_0_0/diligent_jstk_digilent_jstk2_0_0.xci">
+          <Proxy FileSetName="diligent_jstk_digilent_jstk2_0_0"/>
+        </CompFileExtendedInfo>
+        <CompFileExtendedInfo CompFileName="diligent_jstk.bd" FileRelPathName="ip/diligent_jstk_proc_sys_reset_0_0/diligent_jstk_proc_sys_reset_0_0.xci">
+          <Proxy FileSetName="diligent_jstk_proc_sys_reset_0_0"/>
+        </CompFileExtendedInfo>
+        <CompFileExtendedInfo CompFileName="diligent_jstk.bd" FileRelPathName="ip/diligent_jstk_system_ila_0_0/diligent_jstk_system_ila_0_0.xci">
+          <Proxy FileSetName="diligent_jstk_system_ila_0_0"/>
+        </CompFileExtendedInfo>
+        <CompFileExtendedInfo CompFileName="diligent_jstk.bd" FileRelPathName="ip/diligent_jstk_AXI4Stream_UART_0_0/diligent_jstk_AXI4Stream_UART_0_0.xci">
+          <Proxy FileSetName="diligent_jstk_AXI4Stream_UART_0_0"/>
+        </CompFileExtendedInfo>
+      </File>
+      <File Path="$PPRDIR/../../design/diligent_jstk/hdl/diligent_jstk_wrapper.vhd">
+        <FileInfo>
           <Attr Name="UsedIn" Val="synthesis"/>
           <Attr Name="UsedIn" Val="simulation"/>
         </FileInfo>
@@ -145,9 +164,9 @@
         <Option Name="TopAutoSet" Val="TRUE"/>
       </Config>
     </FileSet>
-    <FileSet Name="diligent_jstk_proc_sys_reset_0_0" Type="BlockSrcs" RelSrcDir="$PSRCDIR/diligent_jstk_proc_sys_reset_0_0" RelGenDir="$PGENDIR/diligent_jstk_proc_sys_reset_0_0">
+    <FileSet Name="diligent_jstk_jstk_uart_bridge_0_0" Type="BlockSrcs" RelSrcDir="$PSRCDIR/diligent_jstk_jstk_uart_bridge_0_0" RelGenDir="$PGENDIR/diligent_jstk_jstk_uart_bridge_0_0">
       <Config>
-        <Option Name="TopModule" Val="diligent_jstk_proc_sys_reset_0_0"/>
+        <Option Name="TopModule" Val="diligent_jstk_jstk_uart_bridge_0_0"/>
         <Option Name="UseBlackboxStub" Val="1"/>
       </Config>
     </FileSet>
@@ -163,27 +182,27 @@
         <Option Name="UseBlackboxStub" Val="1"/>
       </Config>
     </FileSet>
-    <FileSet Name="diligent_jstk_system_ila_0_0" Type="BlockSrcs" RelSrcDir="$PSRCDIR/diligent_jstk_system_ila_0_0" RelGenDir="$PGENDIR/diligent_jstk_system_ila_0_0">
-      <Config>
-        <Option Name="TopModule" Val="diligent_jstk_system_ila_0_0"/>
-        <Option Name="UseBlackboxStub" Val="1"/>
-      </Config>
-    </FileSet>
     <FileSet Name="diligent_jstk_digilent_jstk2_0_0" Type="BlockSrcs" RelSrcDir="$PSRCDIR/diligent_jstk_digilent_jstk2_0_0" RelGenDir="$PGENDIR/diligent_jstk_digilent_jstk2_0_0">
       <Config>
         <Option Name="TopModule" Val="diligent_jstk_digilent_jstk2_0_0"/>
         <Option Name="UseBlackboxStub" Val="1"/>
       </Config>
     </FileSet>
-    <FileSet Name="diligent_jstk_AXI4Stream_UART_0_0" Type="BlockSrcs" RelSrcDir="$PSRCDIR/diligent_jstk_AXI4Stream_UART_0_0" RelGenDir="$PGENDIR/diligent_jstk_AXI4Stream_UART_0_0">
+    <FileSet Name="diligent_jstk_proc_sys_reset_0_0" Type="BlockSrcs" RelSrcDir="$PSRCDIR/diligent_jstk_proc_sys_reset_0_0" RelGenDir="$PGENDIR/diligent_jstk_proc_sys_reset_0_0">
       <Config>
-        <Option Name="TopModule" Val="diligent_jstk_AXI4Stream_UART_0_0"/>
+        <Option Name="TopModule" Val="diligent_jstk_proc_sys_reset_0_0"/>
         <Option Name="UseBlackboxStub" Val="1"/>
       </Config>
     </FileSet>
-    <FileSet Name="diligent_jstk_jstk_uart_bridge_0_0" Type="BlockSrcs" RelSrcDir="$PSRCDIR/diligent_jstk_jstk_uart_bridge_0_0" RelGenDir="$PGENDIR/diligent_jstk_jstk_uart_bridge_0_0">
+    <FileSet Name="diligent_jstk_system_ila_0_0" Type="BlockSrcs" RelSrcDir="$PSRCDIR/diligent_jstk_system_ila_0_0" RelGenDir="$PGENDIR/diligent_jstk_system_ila_0_0">
       <Config>
-        <Option Name="TopModule" Val="diligent_jstk_jstk_uart_bridge_0_0"/>
+        <Option Name="TopModule" Val="diligent_jstk_system_ila_0_0"/>
+        <Option Name="UseBlackboxStub" Val="1"/>
+      </Config>
+    </FileSet>
+    <FileSet Name="diligent_jstk_AXI4Stream_UART_0_0" Type="BlockSrcs" RelSrcDir="$PSRCDIR/diligent_jstk_AXI4Stream_UART_0_0" RelGenDir="$PGENDIR/diligent_jstk_AXI4Stream_UART_0_0">
+      <Config>
+        <Option Name="TopModule" Val="diligent_jstk_AXI4Stream_UART_0_0"/>
         <Option Name="UseBlackboxStub" Val="1"/>
       </Config>
     </FileSet>
@@ -207,79 +226,101 @@
     </Simulator>
   </Simulators>
   <Runs Version="1" Minor="15">
-    <Run Id="synth_1" Type="Ft3:Synth" SrcSet="sources_1" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/synth_1">
+    <Run Id="synth_1" Type="Ft3:Synth" SrcSet="sources_1" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" Dir="$PRUNDIR/synth_1" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/synth_1">
       <Strategy Version="1" Minor="2">
         <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020"/>
         <Step Id="synth_design"/>
       </Strategy>
+      <GeneratedRun Dir="$PRUNDIR" File="gen_run.xml"/>
       <ReportStrategy Name="Vivado Synthesis Default Reports" Flow="Vivado Synthesis 2020"/>
       <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
       <RQSFiles/>
     </Run>
-    <Run Id="diligent_jstk_proc_sys_reset_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_proc_sys_reset_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_proc_sys_reset_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_proc_sys_reset_0_0_synth_1">
+    <Run Id="diligent_jstk_jstk_uart_bridge_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_jstk_uart_bridge_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_jstk_uart_bridge_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" Dir="$PRUNDIR/diligent_jstk_jstk_uart_bridge_0_0_synth_1" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_jstk_uart_bridge_0_0_synth_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020"/>
+        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020">
+          <Desc>Vivado Synthesis Defaults</Desc>
+        </StratHandle>
         <Step Id="synth_design"/>
       </Strategy>
+      <GeneratedRun Dir="$PRUNDIR" File="gen_run.xml"/>
       <ReportStrategy Name="Vivado Synthesis Default Reports" Flow="Vivado Synthesis 2020"/>
       <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
       <RQSFiles/>
     </Run>
-    <Run Id="diligent_jstk_clk_wiz_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_clk_wiz_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_clk_wiz_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_clk_wiz_0_0_synth_1">
+    <Run Id="diligent_jstk_clk_wiz_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_clk_wiz_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_clk_wiz_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" Dir="$PRUNDIR/diligent_jstk_clk_wiz_0_0_synth_1" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_clk_wiz_0_0_synth_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020"/>
+        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020">
+          <Desc>Vivado Synthesis Defaults</Desc>
+        </StratHandle>
         <Step Id="synth_design"/>
       </Strategy>
+      <GeneratedRun Dir="$PRUNDIR" File="gen_run.xml"/>
       <ReportStrategy Name="Vivado Synthesis Default Reports" Flow="Vivado Synthesis 2020"/>
       <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
       <RQSFiles/>
     </Run>
-    <Run Id="diligent_jstk_axi4stream_spi_master_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_axi4stream_spi_master_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_axi4stream_spi_master_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_axi4stream_spi_master_0_0_synth_1">
+    <Run Id="diligent_jstk_axi4stream_spi_master_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_axi4stream_spi_master_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_axi4stream_spi_master_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" Dir="$PRUNDIR/diligent_jstk_axi4stream_spi_master_0_0_synth_1" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_axi4stream_spi_master_0_0_synth_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020"/>
+        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020">
+          <Desc>Vivado Synthesis Defaults</Desc>
+        </StratHandle>
         <Step Id="synth_design"/>
       </Strategy>
+      <GeneratedRun Dir="$PRUNDIR" File="gen_run.xml"/>
       <ReportStrategy Name="Vivado Synthesis Default Reports" Flow="Vivado Synthesis 2020"/>
       <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
       <RQSFiles/>
     </Run>
-    <Run Id="diligent_jstk_system_ila_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_system_ila_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_system_ila_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_system_ila_0_0_synth_1">
+    <Run Id="diligent_jstk_digilent_jstk2_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_digilent_jstk2_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_digilent_jstk2_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" Dir="$PRUNDIR/diligent_jstk_digilent_jstk2_0_0_synth_1" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_digilent_jstk2_0_0_synth_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020"/>
+        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020">
+          <Desc>Vivado Synthesis Defaults</Desc>
+        </StratHandle>
         <Step Id="synth_design"/>
       </Strategy>
+      <GeneratedRun Dir="$PRUNDIR" File="gen_run.xml"/>
       <ReportStrategy Name="Vivado Synthesis Default Reports" Flow="Vivado Synthesis 2020"/>
       <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
       <RQSFiles/>
     </Run>
-    <Run Id="diligent_jstk_digilent_jstk2_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_digilent_jstk2_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_digilent_jstk2_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_digilent_jstk2_0_0_synth_1">
+    <Run Id="diligent_jstk_proc_sys_reset_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_proc_sys_reset_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_proc_sys_reset_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" Dir="$PRUNDIR/diligent_jstk_proc_sys_reset_0_0_synth_1" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_proc_sys_reset_0_0_synth_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020"/>
+        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020">
+          <Desc>Vivado Synthesis Defaults</Desc>
+        </StratHandle>
         <Step Id="synth_design"/>
       </Strategy>
+      <GeneratedRun Dir="$PRUNDIR" File="gen_run.xml"/>
       <ReportStrategy Name="Vivado Synthesis Default Reports" Flow="Vivado Synthesis 2020"/>
       <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
       <RQSFiles/>
     </Run>
-    <Run Id="diligent_jstk_AXI4Stream_UART_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_AXI4Stream_UART_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_AXI4Stream_UART_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_AXI4Stream_UART_0_0_synth_1">
+    <Run Id="diligent_jstk_system_ila_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_system_ila_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_system_ila_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" Dir="$PRUNDIR/diligent_jstk_system_ila_0_0_synth_1" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_system_ila_0_0_synth_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020"/>
+        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020">
+          <Desc>Vivado Synthesis Defaults</Desc>
+        </StratHandle>
         <Step Id="synth_design"/>
       </Strategy>
+      <GeneratedRun Dir="$PRUNDIR" File="gen_run.xml"/>
       <ReportStrategy Name="Vivado Synthesis Default Reports" Flow="Vivado Synthesis 2020"/>
       <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
       <RQSFiles/>
     </Run>
-    <Run Id="diligent_jstk_jstk_uart_bridge_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_jstk_uart_bridge_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_jstk_uart_bridge_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_jstk_uart_bridge_0_0_synth_1">
+    <Run Id="diligent_jstk_AXI4Stream_UART_0_0_synth_1" Type="Ft3:Synth" SrcSet="diligent_jstk_AXI4Stream_UART_0_0" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_AXI4Stream_UART_0_0" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" Dir="$PRUNDIR/diligent_jstk_AXI4Stream_UART_0_0_synth_1" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_AXI4Stream_UART_0_0_synth_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020"/>
+        <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020">
+          <Desc>Vivado Synthesis Defaults</Desc>
+        </StratHandle>
         <Step Id="synth_design"/>
       </Strategy>
+      <GeneratedRun Dir="$PRUNDIR" File="gen_run.xml"/>
       <ReportStrategy Name="Vivado Synthesis Default Reports" Flow="Vivado Synthesis 2020"/>
       <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
       <RQSFiles/>
     </Run>
-    <Run Id="impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" SynthRun="synth_1" IncludeInArchive="true" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/impl_1">
+    <Run Id="impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" Dir="$PRUNDIR/impl_1" SynthRun="synth_1" IncludeInArchive="true" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/impl_1">
       <Strategy Version="1" Minor="2">
         <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020"/>
         <Step Id="init_design"/>
@@ -292,13 +333,16 @@
         <Step Id="post_route_phys_opt_design"/>
         <Step Id="write_bitstream"/>
       </Strategy>
+      <GeneratedRun Dir="$PRUNDIR" File="gen_run.xml"/>
       <ReportStrategy Name="Vivado Implementation Default Reports" Flow="Vivado Implementation 2020"/>
       <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
       <RQSFiles/>
     </Run>
-    <Run Id="diligent_jstk_proc_sys_reset_0_0_impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_proc_sys_reset_0_0" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" SynthRun="diligent_jstk_proc_sys_reset_0_0_synth_1" IncludeInArchive="false" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_proc_sys_reset_0_0_impl_1">
+    <Run Id="diligent_jstk_jstk_uart_bridge_0_0_impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_jstk_uart_bridge_0_0" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" SynthRun="diligent_jstk_jstk_uart_bridge_0_0_synth_1" IncludeInArchive="false" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_jstk_uart_bridge_0_0_impl_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020"/>
+        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020">
+          <Desc>Default settings for Implementation.</Desc>
+        </StratHandle>
         <Step Id="init_design"/>
         <Step Id="opt_design"/>
         <Step Id="power_opt_design"/>
@@ -315,7 +359,9 @@
     </Run>
     <Run Id="diligent_jstk_clk_wiz_0_0_impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_clk_wiz_0_0" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" SynthRun="diligent_jstk_clk_wiz_0_0_synth_1" IncludeInArchive="false" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_clk_wiz_0_0_impl_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020"/>
+        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020">
+          <Desc>Default settings for Implementation.</Desc>
+        </StratHandle>
         <Step Id="init_design"/>
         <Step Id="opt_design"/>
         <Step Id="power_opt_design"/>
@@ -332,24 +378,9 @@
     </Run>
     <Run Id="diligent_jstk_axi4stream_spi_master_0_0_impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_axi4stream_spi_master_0_0" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" SynthRun="diligent_jstk_axi4stream_spi_master_0_0_synth_1" IncludeInArchive="false" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_axi4stream_spi_master_0_0_impl_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020"/>
-        <Step Id="init_design"/>
-        <Step Id="opt_design"/>
-        <Step Id="power_opt_design"/>
-        <Step Id="place_design"/>
-        <Step Id="post_place_power_opt_design"/>
-        <Step Id="phys_opt_design"/>
-        <Step Id="route_design"/>
-        <Step Id="post_route_phys_opt_design"/>
-        <Step Id="write_bitstream"/>
-      </Strategy>
-      <ReportStrategy Name="Vivado Implementation Default Reports" Flow="Vivado Implementation 2020"/>
-      <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
-      <RQSFiles/>
-    </Run>
-    <Run Id="diligent_jstk_system_ila_0_0_impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_system_ila_0_0" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" SynthRun="diligent_jstk_system_ila_0_0_synth_1" IncludeInArchive="false" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_system_ila_0_0_impl_1">
-      <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020"/>
+        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020">
+          <Desc>Default settings for Implementation.</Desc>
+        </StratHandle>
         <Step Id="init_design"/>
         <Step Id="opt_design"/>
         <Step Id="power_opt_design"/>
@@ -366,7 +397,47 @@
     </Run>
     <Run Id="diligent_jstk_digilent_jstk2_0_0_impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_digilent_jstk2_0_0" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" SynthRun="diligent_jstk_digilent_jstk2_0_0_synth_1" IncludeInArchive="false" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_digilent_jstk2_0_0_impl_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020"/>
+        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020">
+          <Desc>Default settings for Implementation.</Desc>
+        </StratHandle>
+        <Step Id="init_design"/>
+        <Step Id="opt_design"/>
+        <Step Id="power_opt_design"/>
+        <Step Id="place_design"/>
+        <Step Id="post_place_power_opt_design"/>
+        <Step Id="phys_opt_design"/>
+        <Step Id="route_design"/>
+        <Step Id="post_route_phys_opt_design"/>
+        <Step Id="write_bitstream"/>
+      </Strategy>
+      <ReportStrategy Name="Vivado Implementation Default Reports" Flow="Vivado Implementation 2020"/>
+      <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
+      <RQSFiles/>
+    </Run>
+    <Run Id="diligent_jstk_proc_sys_reset_0_0_impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_proc_sys_reset_0_0" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" SynthRun="diligent_jstk_proc_sys_reset_0_0_synth_1" IncludeInArchive="false" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_proc_sys_reset_0_0_impl_1">
+      <Strategy Version="1" Minor="2">
+        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020">
+          <Desc>Default settings for Implementation.</Desc>
+        </StratHandle>
+        <Step Id="init_design"/>
+        <Step Id="opt_design"/>
+        <Step Id="power_opt_design"/>
+        <Step Id="place_design"/>
+        <Step Id="post_place_power_opt_design"/>
+        <Step Id="phys_opt_design"/>
+        <Step Id="route_design"/>
+        <Step Id="post_route_phys_opt_design"/>
+        <Step Id="write_bitstream"/>
+      </Strategy>
+      <ReportStrategy Name="Vivado Implementation Default Reports" Flow="Vivado Implementation 2020"/>
+      <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
+      <RQSFiles/>
+    </Run>
+    <Run Id="diligent_jstk_system_ila_0_0_impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_system_ila_0_0" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" SynthRun="diligent_jstk_system_ila_0_0_synth_1" IncludeInArchive="false" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_system_ila_0_0_impl_1">
+      <Strategy Version="1" Minor="2">
+        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020">
+          <Desc>Default settings for Implementation.</Desc>
+        </StratHandle>
         <Step Id="init_design"/>
         <Step Id="opt_design"/>
         <Step Id="power_opt_design"/>
@@ -383,24 +454,9 @@
     </Run>
     <Run Id="diligent_jstk_AXI4Stream_UART_0_0_impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_AXI4Stream_UART_0_0" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" SynthRun="diligent_jstk_AXI4Stream_UART_0_0_synth_1" IncludeInArchive="false" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_AXI4Stream_UART_0_0_impl_1">
       <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020"/>
-        <Step Id="init_design"/>
-        <Step Id="opt_design"/>
-        <Step Id="power_opt_design"/>
-        <Step Id="place_design"/>
-        <Step Id="post_place_power_opt_design"/>
-        <Step Id="phys_opt_design"/>
-        <Step Id="route_design"/>
-        <Step Id="post_route_phys_opt_design"/>
-        <Step Id="write_bitstream"/>
-      </Strategy>
-      <ReportStrategy Name="Vivado Implementation Default Reports" Flow="Vivado Implementation 2020"/>
-      <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
-      <RQSFiles/>
-    </Run>
-    <Run Id="diligent_jstk_jstk_uart_bridge_0_0_impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="diligent_jstk_jstk_uart_bridge_0_0" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" SynthRun="diligent_jstk_jstk_uart_bridge_0_0_synth_1" IncludeInArchive="false" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/diligent_jstk_jstk_uart_bridge_0_0_impl_1">
-      <Strategy Version="1" Minor="2">
-        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020"/>
+        <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020">
+          <Desc>Default settings for Implementation.</Desc>
+        </StratHandle>
         <Step Id="init_design"/>
         <Step Id="opt_design"/>
         <Step Id="power_opt_design"/>
diff --git a/LAB3/vivado/lab3/lab3.xpr b/LAB3/vivado/lab3/lab3.xpr
index d278d19..efa626e 100644
--- a/LAB3/vivado/lab3/lab3.xpr
+++ b/LAB3/vivado/lab3/lab3.xpr
@@ -247,16 +247,17 @@
     </Simulator>
   </Simulators>
   <Runs Version="1" Minor="15">
-    <Run Id="synth_1" Type="Ft3:Synth" SrcSet="sources_1" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/synth_1">
+    <Run Id="synth_1" Type="Ft3:Synth" SrcSet="sources_1" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Vivado Synthesis Defaults" AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" Dir="$PRUNDIR/synth_1" IncludeInArchive="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/synth_1">
       <Strategy Version="1" Minor="2">
         <StratHandle Name="Vivado Synthesis Defaults" Flow="Vivado Synthesis 2020"/>
         <Step Id="synth_design"/>
       </Strategy>
+      <GeneratedRun Dir="$PRUNDIR" File="gen_run.xml"/>
       <ReportStrategy Name="Vivado Synthesis Default Reports" Flow="Vivado Synthesis 2020"/>
       <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
       <RQSFiles/>
     </Run>
-    <Run Id="impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" SynthRun="synth_1" IncludeInArchive="true" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/impl_1">
+    <Run Id="impl_1" Type="Ft2:EntireDesign" Part="xc7a35tcpg236-1" ConstrsSet="constrs_1" Description="Default settings for Implementation." AutoIncrementalCheckpoint="false" WriteIncrSynthDcp="false" State="current" Dir="$PRUNDIR/impl_1" SynthRun="synth_1" IncludeInArchive="true" GenFullBitstream="true" AutoIncrementalDir="$PSRCDIR/utils_1/imports/impl_1">
       <Strategy Version="1" Minor="2">
         <StratHandle Name="Vivado Implementation Defaults" Flow="Vivado Implementation 2020"/>
         <Step Id="init_design"/>
@@ -269,6 +270,7 @@
         <Step Id="post_route_phys_opt_design"/>
         <Step Id="write_bitstream"/>
       </Strategy>
+      <GeneratedRun Dir="$PRUNDIR" File="gen_run.xml"/>
       <ReportStrategy Name="Vivado Implementation Default Reports" Flow="Vivado Implementation 2020"/>
       <Report Name="ROUTE_DESIGN.REPORT_METHODOLOGY" Enabled="1"/>
       <RQSFiles/>
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..ae328dd
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,6 @@
+pyserial
+matplotlib
+pillow
+numpy
+tqdm
+scipy
\ No newline at end of file