diff --git a/app/MDK-ARM/app.uvguix.29643 b/app/MDK-ARM/app.uvguix.29643
index 59e6ba4..876b4b8 100644
--- a/app/MDK-ARM/app.uvguix.29643
+++ b/app/MDK-ARM/app.uvguix.29643
@@ -15,7 +15,7 @@
     <View>
       <WinId>38003</WinId>
       <ViewName>Registers</ViewName>
-      <TableColWidths>140 90</TableColWidths>
+      <TableColWidths>140 100</TableColWidths>
     </View>
     <View>
       <WinId>346</WinId>
@@ -25,7 +25,7 @@
     <View>
       <WinId>204</WinId>
       <ViewName>Performance Analyzer</ViewName>
-      <TableColWidths>1170</TableColWidths>
+      <TableColWidths>720 175 175 100</TableColWidths>
     </View>
   </SECTreeCtrl>
 
@@ -93,25 +93,25 @@
       <flags>0</flags>
       <showCmd>1</showCmd>
       <MinPosition>
-        <xPos>-1</xPos>
-        <yPos>-1</yPos>
+        <xPos>-32000</xPos>
+        <yPos>-32000</yPos>
       </MinPosition>
       <MaxPosition>
         <xPos>-1</xPos>
         <yPos>-1</yPos>
       </MaxPosition>
       <NormalPosition>
-        <Top>121</Top>
-        <Left>2282</Left>
-        <Right>3722</Right>
-        <Bottom>1001</Bottom>
+        <Top>70</Top>
+        <Left>2265</Left>
+        <Right>3705</Right>
+        <Bottom>950</Bottom>
       </NormalPosition>
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     <MDIClientArea>
       <RegID>0</RegID>
       <MDITabState>
-        <Len>60</Len>
-        <Data>010000000400000001000000010000000100000001000000000000000200000000000000010000000100000000000000280000002800000000000000</Data>
+        <Len>429</Len>
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@@ -134,7 +134,7 @@
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           <Len>16</Len>
-          <Data>E6090000E7000000820E000077010000</Data>
+          <Data>D5090000B4000000710E000044010000</Data>
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@@ -1799,14 +1799,14 @@
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         <Buttons>
           <Len>2373</Len>
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         </Buttons>
         <OriginalItems>
           <Len>898</Len>
@@ -1857,4 +1857,31 @@
     </ViewEx>
   </WinLayoutEx>
 
+  <MDIGroups>
+    <Orientation>1</Orientation>
+    <ActiveMDIGroup>0</ActiveMDIGroup>
+    <MDIGroup>
+      <Size>100</Size>
+      <ActiveTab>1</ActiveTab>
+      <Doc>
+        <Name>startup_stm32l432xx.s</Name>
+        <ColumnNumber>0</ColumnNumber>
+        <TopLine>166</TopLine>
+        <CurrentLine>173</CurrentLine>
+        <Folding>0</Folding>
+        <ContractedFolders></ContractedFolders>
+        <PaneID>0</PaneID>
+      </Doc>
+      <Doc>
+        <Name>../Core/Src/main.c</Name>
+        <ColumnNumber>0</ColumnNumber>
+        <TopLine>86</TopLine>
+        <CurrentLine>107</CurrentLine>
+        <Folding>1</Folding>
+        <ContractedFolders></ContractedFolders>
+        <PaneID>0</PaneID>
+      </Doc>
+    </MDIGroup>
+  </MDIGroups>
+
 </ProjectGui>
diff --git a/app/MDK-ARM/app.uvoptx b/app/MDK-ARM/app.uvoptx
index 97fbb9a..776c4cc 100644
--- a/app/MDK-ARM/app.uvoptx
+++ b/app/MDK-ARM/app.uvoptx
@@ -133,7 +133,56 @@
           <Name>-U-O142 -O2254 -S0 -C0 -TO18 -TC10000000 -TP21 -TDS8007 -TDT0 -TDC1F -TIEFFFFFFFF -TIP8 -FO7 -FD20000000 -FC1000 -FN1 -FF0STM32L4xx_128.FLM -FS08000000 -FL020000 -FP0($$Device:STM32L432KBUx$CMSIS\Flash\STM32L4xx_128.FLM)</Name>
         </SetRegEntry>
       </TargetDriverDllRegistry>
-      <Breakpoint/>
+      <Breakpoint>
+        <Bp>
+          <Number>0</Number>
+          <Type>0</Type>
+          <LineNumber>80</LineNumber>
+          <EnabledFlag>1</EnabledFlag>
+          <Address>0</Address>
+          <ByteObject>0</ByteObject>
+          <HtxType>0</HtxType>
+          <ManyObjects>0</ManyObjects>
+          <SizeOfObject>0</SizeOfObject>
+          <BreakByAccess>0</BreakByAccess>
+          <BreakIfRCount>0</BreakIfRCount>
+          <Filename>../Core/Src/main.c</Filename>
+          <ExecCommand></ExecCommand>
+          <Expression></Expression>
+        </Bp>
+        <Bp>
+          <Number>1</Number>
+          <Type>0</Type>
+          <LineNumber>87</LineNumber>
+          <EnabledFlag>1</EnabledFlag>
+          <Address>0</Address>
+          <ByteObject>0</ByteObject>
+          <HtxType>0</HtxType>
+          <ManyObjects>0</ManyObjects>
+          <SizeOfObject>0</SizeOfObject>
+          <BreakByAccess>0</BreakByAccess>
+          <BreakIfRCount>0</BreakIfRCount>
+          <Filename>../Core/Src/main.c</Filename>
+          <ExecCommand></ExecCommand>
+          <Expression></Expression>
+        </Bp>
+        <Bp>
+          <Number>2</Number>
+          <Type>0</Type>
+          <LineNumber>107</LineNumber>
+          <EnabledFlag>1</EnabledFlag>
+          <Address>0</Address>
+          <ByteObject>0</ByteObject>
+          <HtxType>0</HtxType>
+          <ManyObjects>0</ManyObjects>
+          <SizeOfObject>0</SizeOfObject>
+          <BreakByAccess>0</BreakByAccess>
+          <BreakIfRCount>0</BreakIfRCount>
+          <Filename>../Core/Src/main.c</Filename>
+          <ExecCommand></ExecCommand>
+          <Expression></Expression>
+        </Bp>
+      </Breakpoint>
       <Tracepoint>
         <THDelay>0</THDelay>
       </Tracepoint>
diff --git a/usersrc/usermain.c b/usersrc/usermain.c
index 85eb1b5..f43528b 100644
--- a/usersrc/usermain.c
+++ b/usersrc/usermain.c
@@ -5,18 +5,13 @@
 #include "main.h"
 #include "usart.h"
 
-int fputc(int ch, FILE *stream)
-{
-  uint8_t c = ch;
-  HAL_UART_Transmit(&huart1, &c, 1, 100);
-  return ch;
-}
-
 void user_main()
 {
+  uint8_t c = 'o';
 
   while (1)
   {
-    printf("ok\r\n");
+    HAL_UART_Transmit(&huart1, &c, 1, 100);
+    HAL_Delay(100);
   }
 }