diff --git a/F3:F303/I2C_scan/i2c.c b/F3:F303/I2C_scan/i2c.c
index 27d8404..416e6e9 100644
--- a/F3:F303/I2C_scan/i2c.c
+++ b/F3:F303/I2C_scan/i2c.c
@@ -64,15 +64,21 @@ void i2c_setup(I2C_SPEED speed){
     GPIOB->PUPDR = (GPIOB->PUPDR & !(GPIO_PUPDR_PUPDR6 | GPIO_PUPDR_PUPDR7)) |
             GPIO_PUPDR6_PU | GPIO_PUPDR7_PU; // pullup (what if there's no external pullup?)
     GPIOB->OTYPER |= GPIO_OTYPER_OT_6 | GPIO_OTYPER_OT_7; // both open-drain outputs
-    // I2C (default timing from PCLK - 64MHz)
+    // I2C (default timing from sys clock - 72MHz)
     RCC->APB1ENR |= RCC_APB1ENR_I2C1EN; // clocking
-    if(speed == LOW_SPEED){ // 10kHz
-        // PRESC=F, SCLDEL=4, SDADEL=2, SCLH=0xC3, SCLL=0xC7
-        I2C1->TIMINGR = (0xF<<28) | (4<<20) | (2<<16) | (0xC3<<8) | (0xC7);
-    }else if(speed == HIGH_SPEED){ // 100kHz
-        I2C1->TIMINGR = (0xF<<28) | (4<<20) | (2<<16) | (0xF<<8) | (0x13);
-    }else{ // VERYLOW_SPEED - the lowest speed by STM register: ~7.7kHz
-        I2C1->TIMINGR = (0xF<<28) | (4<<20) | (2<<16) | (0xff<<8) | (0xff);
+    if(speed == HIGH_SPEED){
+        // activate "fast mode plus"
+        SYSCFG->CFGR1 |= SYSCFG_CFGR1_I2C1_FMP | SYSCFG_CFGR1_I2C_PB6_FMP | SYSCFG_CFGR1_I2C_PB7_FMP;
+    }else{
+        SYSCFG->CFGR1 &= ~(SYSCFG_CFGR1_I2C1_FMP | SYSCFG_CFGR1_I2C_PB6_FMP | SYSCFG_CFGR1_I2C_PB7_FMP);
+    }
+    if(speed == LOW_SPEED){ // 100kHz
+        I2C1->TIMINGR = (0xf<<28) | (0x04<<20) | (0x03<<16) | (0x12<<8) | (0x15);
+        //                 PRESC      SCLDEL        SDADEL        SCLH      SCLL
+    }else if(speed == HIGH_SPEED){ // 400kHz
+        I2C1->TIMINGR = (0x06<<28) | (0x04<<20) | (0x03<<16) | (0x06<<8) | (0x08);
+    }else{ // VERYLOW_SPEED - 10kHz
+        I2C1->TIMINGR = (0xf<<28) | (0x04<<20) | (0x03<<16) | (0xc3<<8) | (0xc7);
     }
     I2C1->CR1 = I2CCR1;
     RCC->AHBENR |= RCC_AHBENR_DMA1EN;
@@ -97,31 +103,37 @@ static void i2cDMAsetup(int tx, uint8_t len){
     }
 }
 
-static uint8_t i2c_start(uint8_t busychk){
+static uint8_t i2c_chk(uint8_t busychk){
+    I2C1->CR2 = 0;
     if(busychk){
         cntr = Tms;
         while(I2C1->ISR & I2C_ISR_BUSY){
             IWDG->KR = IWDG_REFRESH;
             if(Tms - cntr > I2C_TIMEOUT){
-                USND("Line busy\n");
+                USND("i2c_chk: Line busy\n");
                 return 0;  // check busy
         }}
-    }
+    }/*
     cntr = Tms;
     while(I2C1->CR2 & I2C_CR2_START){
         IWDG->KR = IWDG_REFRESH;
         if(Tms - cntr > I2C_TIMEOUT){
-            USND("No start\n");
+            USND("i2c_chk: No start\n");
             return 0; // check start
-    }}
+    }}*/
     return 1;
 }
 
 // start writing
 static uint8_t i2c_startw(uint8_t addr, uint8_t nbytes, uint8_t stop){
-    if(!i2c_start(1)) return 0;
+    if(!i2c_chk(1)) return 0;
     I2C1->CR2 = nbytes << 16 | addr;
-    if(stop) I2C1->CR2 |= I2C_CR2_AUTOEND; // autoend
+    if(stop){
+        I2C1->CR2 |= I2C_CR2_AUTOEND; // autoend
+    }else{
+        //I2C1->CR2 &= ~I2C_CR2_AUTOEND;
+        //I2C1->CR2 |= I2C_CR2_RELOAD;
+    }
     // now start transfer
     I2C1->CR2 |= I2C_CR2_START;
     return 1;
@@ -143,21 +155,31 @@ static uint8_t write_i2cs(uint8_t addr, uint8_t *data, uint8_t nbytes, uint8_t s
             IWDG->KR = IWDG_REFRESH;
             if(I2C1->ISR & I2C_ISR_NACKF){
                 I2C1->ICR |= I2C_ICR_NACKCF;
-                //USND("NAK\n");
+                USND("write_i2cs: NAK\n");
                 return 0;
             }
             if(Tms - cntr > I2C_TIMEOUT){
-                //USND("Timeout\n");
+                USND("write_i2cs: Timeout\n");
                 return 0;
             }
         }
         I2C1->TXDR = data[i]; // send data
+        USND("write_i2cs: "); USND(uhex2str(data[i])); newline();
     }
     cntr = Tms;
-    // wait for data gone
-    while(I2C1->ISR & I2C_ISR_BUSY){
-        IWDG->KR = IWDG_REFRESH;
-        if(Tms - cntr > I2C_TIMEOUT){break;}
+    if(stop){
+        while(I2C1->ISR & I2C_ISR_BUSY){
+            IWDG->KR = IWDG_REFRESH;
+            if(Tms - cntr > I2C_TIMEOUT){USND("write_i2cs: Busy timeout\n"); break;}
+        }
+    }else{ // repeated start
+        while(!(I2C1->ISR & I2C_ISR_TC)){
+            IWDG->KR = IWDG_REFRESH;
+            if(Tms - cntr > I2C_TIMEOUT){
+                USND("write_i2cs: TC timeout\n");
+                return 0;
+            }
+        }
     }
     return 1;
 }
@@ -181,10 +203,11 @@ uint8_t write_i2c_dma(uint8_t addr, uint8_t *data, uint8_t nbytes){
 
 // start reading
 static uint8_t i2c_startr(uint8_t addr, uint8_t nbytes, uint8_t busychk){
-    if(!i2c_start(busychk)) return 0;
+    if(!i2c_chk(busychk)) return 0;
     // read N bytes
-    I2C1->CR2 = (nbytes<<16) | addr | 1 | I2C_CR2_AUTOEND | I2C_CR2_RD_WRN;
+    I2C1->CR2 = (nbytes<<16) | addr /*| I2C_CR2_AUTOEND*/ | I2C_CR2_RD_WRN;
     I2C1->CR2 |= I2C_CR2_START;
+    I2C1->CR2 |= I2C_CR2_AUTOEND;
     return 1;
 }
 
@@ -203,18 +226,27 @@ static uint8_t read_i2cb(uint8_t addr, uint8_t *data, uint8_t nbytes, uint8_t bu
             IWDG->KR = IWDG_REFRESH;
             if(I2C1->ISR & I2C_ISR_NACKF){
                 I2C1->ICR |= I2C_ICR_NACKCF;
-                //USND("NAK\n");
+                USND("read_i2_nostart: NAK\n");
                 return 0;
             }
             if(Tms - cntr > I2C_TIMEOUT){
-                //USND("Timeout\n");
+                USND("read_i2_nostart: Timeout\n");
                 return 0;
             }
         }
         *data++ = I2C1->RXDR;
+    }/*
+    cntr = Tms;
+    while(!(I2C1->ISR & I2C_ISR_TC)){
+        IWDG->KR = IWDG_REFRESH;
+        if(Tms - cntr > I2C_TIMEOUT){
+            USND("read_i2cs: TC timeout\n");
+            return 0;
+        }
     }
+    I2C1->CR2 = I2C_CR2_STOP;*/
     return 1;
- }
+}
 
 uint8_t read_i2c(uint8_t addr, uint8_t *data, uint8_t nbytes){
     if(isI2Cbusy()) return 0;
@@ -243,6 +275,7 @@ uint8_t read_i2c_reg(uint8_t addr, uint8_t reg, uint8_t *data, uint8_t nbytes){
 // read 16bit register reg
 uint8_t read_i2c_reg16(uint8_t addr, uint16_t reg16, uint8_t *data, uint8_t nbytes){
     if(isI2Cbusy()) return 0;
+    reg16 = __REV16(reg16);
     if(!write_i2cs(addr, (uint8_t*)&reg16, 2, 0)) return 0;
     return read_i2cb(addr, data, nbytes, 0);
 }
diff --git a/F3:F303/I2C_scan/i2cscan.bin b/F3:F303/I2C_scan/i2cscan.bin
index 886c411..e043dbc 100755
Binary files a/F3:F303/I2C_scan/i2cscan.bin and b/F3:F303/I2C_scan/i2cscan.bin differ
diff --git a/F3:F303/I2C_scan/i2cscan.creator.user b/F3:F303/I2C_scan/i2cscan.creator.user
index 19feb85..69da5ac 100644
--- a/F3:F303/I2C_scan/i2cscan.creator.user
+++ b/F3:F303/I2C_scan/i2cscan.creator.user
@@ -1,20 +1,20 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 6.0.0, 2023-01-20T22:32:47. -->
+<!-- Written by QtCreator 17.0.1, 2025-09-14T02:16:15. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>
-  <value type="QByteArray">{cf63021e-ef53-49b0-b03b-2f2570cdf3b6}</value>
+  <value type="QByteArray">{7bd84e39-ca37-46d3-be9d-99ebea85bc0d}</value>
  </data>
  <data>
   <variable>ProjectExplorer.Project.ActiveTarget</variable>
-  <value type="int">0</value>
+  <value type="qlonglong">0</value>
  </data>
  <data>
   <variable>ProjectExplorer.Project.EditorSettings</variable>
   <valuemap type="QVariantMap">
+   <value type="bool" key="EditorConfiguration.AutoDetect">true</value>
    <value type="bool" key="EditorConfiguration.AutoIndent">true</value>
-   <value type="bool" key="EditorConfiguration.AutoSpacesForTabs">false</value>
    <value type="bool" key="EditorConfiguration.CamelCaseNavigation">true</value>
    <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.0">
     <value type="QString" key="language">Cpp</value>
@@ -28,32 +28,35 @@
      <value type="QByteArray" key="CurrentPreferences">QmlJSGlobal</value>
     </valuemap>
    </valuemap>
-   <value type="int" key="EditorConfiguration.CodeStyle.Count">2</value>
+   <value type="qlonglong" key="EditorConfiguration.CodeStyle.Count">2</value>
    <value type="QByteArray" key="EditorConfiguration.Codec">KOI8-R</value>
    <value type="bool" key="EditorConfiguration.ConstrainTooltips">false</value>
    <value type="int" key="EditorConfiguration.IndentSize">4</value>
    <value type="bool" key="EditorConfiguration.KeyboardTooltips">false</value>
+   <value type="int" key="EditorConfiguration.LineEndingBehavior">0</value>
    <value type="int" key="EditorConfiguration.MarginColumn">80</value>
    <value type="bool" key="EditorConfiguration.MouseHiding">true</value>
    <value type="bool" key="EditorConfiguration.MouseNavigation">true</value>
    <value type="int" key="EditorConfiguration.PaddingMode">1</value>
+   <value type="int" key="EditorConfiguration.PreferAfterWhitespaceComments">0</value>
    <value type="bool" key="EditorConfiguration.PreferSingleLineComments">false</value>
    <value type="bool" key="EditorConfiguration.ScrollWheelZooming">true</value>
    <value type="bool" key="EditorConfiguration.ShowMargin">false</value>
-   <value type="int" key="EditorConfiguration.SmartBackspaceBehavior">1</value>
+   <value type="int" key="EditorConfiguration.SmartBackspaceBehavior">0</value>
    <value type="bool" key="EditorConfiguration.SmartSelectionChanging">true</value>
    <value type="bool" key="EditorConfiguration.SpacesForTabs">true</value>
    <value type="int" key="EditorConfiguration.TabKeyBehavior">0</value>
    <value type="int" key="EditorConfiguration.TabSize">8</value>
    <value type="bool" key="EditorConfiguration.UseGlobal">true</value>
    <value type="bool" key="EditorConfiguration.UseIndenter">false</value>
-   <value type="int" key="EditorConfiguration.Utf8BomBehavior">2</value>
+   <value type="int" key="EditorConfiguration.Utf8BomBehavior">1</value>
    <value type="bool" key="EditorConfiguration.addFinalNewLine">true</value>
    <value type="bool" key="EditorConfiguration.cleanIndentation">false</value>
    <value type="bool" key="EditorConfiguration.cleanWhitespace">true</value>
    <value type="QString" key="EditorConfiguration.ignoreFileTypes">*.md, *.MD, Makefile</value>
    <value type="bool" key="EditorConfiguration.inEntireDocument">false</value>
    <value type="bool" key="EditorConfiguration.skipTrailingWhitespace">true</value>
+   <value type="bool" key="EditorConfiguration.tintMarginArea">true</value>
   </valuemap>
  </data>
  <data>
@@ -67,17 +70,17 @@
     <value type="bool" key="AutoTest.Framework.QtQuickTest">true</value>
     <value type="bool" key="AutoTest.Framework.QtTest">true</value>
    </valuemap>
+   <value type="bool" key="AutoTest.ApplyFilter">false</value>
    <valuemap type="QVariantMap" key="AutoTest.CheckStates"/>
+   <valuelist type="QVariantList" key="AutoTest.PathFilters"/>
    <value type="int" key="AutoTest.RunAfterBuild">0</value>
    <value type="bool" key="AutoTest.UseGlobal">true</value>
-   <valuelist type="QVariantList" key="ClangCodeModel.CustomCommandLineKey"/>
-   <value type="bool" key="ClangCodeModel.UseGlobalConfig">true</value>
-   <value type="QString" key="ClangCodeModel.WarningConfigId">Builtin.BuildSystem</value>
    <valuemap type="QVariantMap" key="ClangTools">
     <value type="bool" key="ClangTools.AnalyzeOpenFiles">true</value>
     <value type="bool" key="ClangTools.BuildBeforeAnalysis">true</value>
     <value type="QString" key="ClangTools.DiagnosticConfig">Builtin.DefaultTidyAndClazy</value>
-    <value type="int" key="ClangTools.ParallelJobs">1</value>
+    <value type="int" key="ClangTools.ParallelJobs">2</value>
+    <value type="bool" key="ClangTools.PreferConfigFile">false</value>
     <valuelist type="QVariantList" key="ClangTools.SelectedDirs"/>
     <valuelist type="QVariantList" key="ClangTools.SelectedFiles"/>
     <valuelist type="QVariantList" key="ClangTools.SuppressedDiagnostics"/>
@@ -89,14 +92,15 @@
   <variable>ProjectExplorer.Project.Target.0</variable>
   <valuemap type="QVariantMap">
    <value type="QString" key="DeviceType">Desktop</value>
+   <value type="bool" key="HasPerBcDcs">true</value>
    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Desktop</value>
    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Desktop</value>
-   <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">{91347f2c-5221-46a7-80b1-0a054ca02f79}</value>
-   <value type="int" key="ProjectExplorer.Target.ActiveBuildConfiguration">0</value>
-   <value type="int" key="ProjectExplorer.Target.ActiveDeployConfiguration">0</value>
-   <value type="int" key="ProjectExplorer.Target.ActiveRunConfiguration">0</value>
+   <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">{65a14f9e-e008-4c1b-89df-4eaa4774b6e3}</value>
+   <value type="qlonglong" key="ProjectExplorer.Target.ActiveBuildConfiguration">0</value>
+   <value type="qlonglong" key="ProjectExplorer.Target.ActiveDeployConfiguration">0</value>
+   <value type="qlonglong" key="ProjectExplorer.Target.ActiveRunConfiguration">0</value>
    <valuemap type="QVariantMap" key="ProjectExplorer.Target.BuildConfiguration.0">
-    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory">/home/eddy/C-files/stm32samples/F3:F303/I2C_scan</value>
+    <value type="QString" key="ProjectExplorer.BuildConfiguration.BuildDirectory">/Big/Data/00__Electronics/STM32/F303-nolib/blink</value>
     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
      <valuemap type="QVariantMap" key="ProjectExplorer.BuildStepList.Step.0">
       <valuelist type="QVariantList" key="GenericProjectManager.GenericMakeStep.BuildTargets">
@@ -105,9 +109,9 @@
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       <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">GenericProjectManager.GenericMakeStep</value>
      </valuemap>
-     <value type="int" key="ProjectExplorer.BuildStepList.StepsCount">1</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Сборка</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Сборка</value>
+     <value type="qlonglong" key="ProjectExplorer.BuildStepList.StepsCount">1</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Build</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Build</value>
      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.BuildSteps.Build</value>
     </valuemap>
     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.1">
@@ -118,9 +122,9 @@
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       <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">GenericProjectManager.GenericMakeStep</value>
      </valuemap>
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-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Очистка</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Очистка</value>
+     <value type="qlonglong" key="ProjectExplorer.BuildStepList.StepsCount">1</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Clean</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Clean</value>
      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.BuildSteps.Clean</value>
     </valuemap>
     <value type="int" key="ProjectExplorer.BuildConfiguration.BuildStepListCount">2</value>
@@ -128,15 +132,47 @@
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     <value type="bool" key="ProjectExplorer.BuildConfiguration.ParseStandardOutput">false</value>
     <valuelist type="QVariantList" key="ProjectExplorer.BuildConfiguration.UserEnvironmentChanges"/>
-    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">По умолчанию</value>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Default</value>
     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">GenericProjectManager.GenericBuildConfiguration</value>
+    <value type="qlonglong" key="ProjectExplorer.Target.ActiveDeployConfiguration">0</value>
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+    <valuemap type="QVariantMap" key="ProjectExplorer.Target.DeployConfiguration.0">
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+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Deploy</value>
+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Deploy</value>
+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.BuildSteps.Deploy</value>
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+     <value type="int" key="ProjectExplorer.BuildConfiguration.BuildStepListCount">1</value>
+     <valuemap type="QVariantMap" key="ProjectExplorer.DeployConfiguration.CustomData"/>
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+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.DefaultDeployConfiguration</value>
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+     <value type="int" key="PE.EnvironmentAspect.Base">2</value>
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    <valuemap type="QVariantMap" key="ProjectExplorer.Target.DeployConfiguration.0">
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-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Развёртывание</value>
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     <value type="int" key="PE.EnvironmentAspect.Base">2</value>
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+    <value type="QString" key="PerfRecordArgsId">-e cpu-cycles --call-graph dwarf,4096 -F 250</value>
+    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName"></value>
     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.CustomExecutableRunConfiguration</value>
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diff --git a/F3:F303/I2C_scan/i2cscan.creator.user.cf63021 b/F3:F303/I2C_scan/i2cscan.creator.user.cf63021
new file mode 100644
index 0000000..19feb85
--- /dev/null
+++ b/F3:F303/I2C_scan/i2cscan.creator.user.cf63021
@@ -0,0 +1,174 @@
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diff --git a/F3:F303/I2C_scan/proto.c b/F3:F303/I2C_scan/proto.c
index c2e4452..7003a7d 100644
--- a/F3:F303/I2C_scan/proto.c
+++ b/F3:F303/I2C_scan/proto.c
@@ -46,19 +46,19 @@ const char *helpstring =
 static uint8_t i2cinited = 0;
 TRUE_INLINE const char *setupI2C(const char *buf){
     buf = omit_spaces(buf);
-    if(*buf < '0' || *buf > '2') return "Wrong speed";
+    if(*buf < '0' || *buf > '2') return "Wrong speed\n";
     i2c_setup(*buf - '0');
     i2cinited = 1;
-    return "OK";
+    return "OK\n";
 }
 
 static uint8_t I2Caddress = 0;
 TRUE_INLINE const char *saI2C(const char *buf){
     uint32_t addr;
-    if(!getnum(buf, &addr) || addr > 0x7f) return "Wrong address";
+    if(!getnum(buf, &addr) || addr > 0x7f) return "Wrong address\n";
     I2Caddress = (uint8_t) addr << 1;
     USND("I2Caddr="); USND(uhex2str(addr)); newline();
-    return "OK";
+    return "OK\n";
 }
 static void rdI2C(const char *buf, int is16){
     uint32_t N = 0;
@@ -111,7 +111,7 @@ static void rdI2C(const char *buf, int is16){
             }
         }
     }
-    if(N == 0){ USND("OK"); return; }
+    if(N == 0){ USND("OK\n"); return; }
     if(!noreg){USND("Register "); USND(uhex2str(reg)); USND(":\n");}
     hexdump(USB_sendstr, locBuffer, N);
 }
@@ -132,8 +132,8 @@ static const char *wrI2C(const char *buf, int isdma){
     uint16_t N = readNnumbers(buf);
     int result = isdma ? write_i2c_dma(I2Caddress, locBuffer, N) :
                          write_i2c(I2Caddress, locBuffer, N);
-    if(!result) return "Error writing I2C";
-    return "OK";
+    if(!result) return "Error writing I2C\n";
+    return "OK\n";
 }
 
 const char *parse_cmd(const char *buf){
diff --git a/F3:F303/I2C_scan/version.inc b/F3:F303/I2C_scan/version.inc
index cde0d53..18928cb 100644
--- a/F3:F303/I2C_scan/version.inc
+++ b/F3:F303/I2C_scan/version.inc
@@ -1,2 +1,2 @@
-#define BUILD_NUMBER "17"
-#define BUILD_DATE "2023-01-22"
+#define BUILD_NUMBER "64"
+#define BUILD_DATE "2025-09-13"
diff --git a/F3:F303/inc/Fx/stm32f3.h b/F3:F303/inc/Fx/stm32f3.h
index c50b043..79b3c61 100644
--- a/F3:F303/inc/Fx/stm32f3.h
+++ b/F3:F303/inc/Fx/stm32f3.h
@@ -123,6 +123,8 @@ TRUE_INLINE int StartHSE(){ // system bus 72MHz from PLL
     WAITWHILE(!(RCC->CR & RCC_CR_PLLRDY));
     // Select PLL as system clock source
     RCC->CFGR = (RCC->CFGR & ~RCC_CFGR_SW) | RCC_CFGR_SW_PLL;
+    // select system clock as I2C source
+    RCC->CFGR3 |= RCC_CFGR3_I2C1SW_SYSCLK | RCC_CFGR3_I2C1SW_SYSCLK;
     // Wait till PLL is used as system clock source
     WAITWHILE((RCC->CFGR & RCC_CFGR_SWS) != RCC_CFGR_SWS_PLL);
     SysFreq = 72000000;