diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..69cabaf
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,6 @@
+{
+    "files.associations": {
+        "mik32_hal_irq.h": "c",
+        "mik32_hal_i2c.h": "c"
+    }
+}
\ No newline at end of file
diff --git a/cores/arduino/mik32/hal/peripherals/Include/mik32_hal_i2c.h b/cores/arduino/mik32/hal/peripherals/Include/mik32_hal_i2c.h
index 68a5a6c..547f48b 100644
--- a/cores/arduino/mik32/hal/peripherals/Include/mik32_hal_i2c.h
+++ b/cores/arduino/mik32/hal/peripherals/Include/mik32_hal_i2c.h
@@ -380,9 +380,6 @@ typedef struct
 
 
 void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c);
-void HAL_I2C_Disable(I2C_HandleTypeDef *hi2c);
-void HAL_I2C_Reset(I2C_HandleTypeDef *hi2c);
-void HAL_I2C_Enable(I2C_HandleTypeDef *hi2c);
 void HAL_I2C_AnalogFilterInit(I2C_HandleTypeDef *hi2c, HAL_I2C_AnalogFilterTypeDef AnalogFilter);
 void HAL_I2C_DigitalFilterInit(I2C_HandleTypeDef *hi2c, HAL_I2C_DigitalFilterTypeDef DigitalFilter);
 void HAL_I2C_SetClockSpeed(I2C_HandleTypeDef *hi2c);
@@ -394,6 +391,7 @@ void HAL_I2C_SBCMode(I2C_HandleTypeDef *hi2c, HAL_I2C_SBCModeTypeDef SBCMode);
 void HAL_I2C_SlaveInit(I2C_HandleTypeDef *hi2c);
 void HAL_I2C_MasterInit(I2C_HandleTypeDef *hi2c);
 HAL_StatusTypeDef HAL_I2C_Init(I2C_HandleTypeDef *hi2c);
+HAL_StatusTypeDef HAL_I2C_Deinit(I2C_HandleTypeDef *hi2c);
 void HAL_I2C_AutoEnd(I2C_HandleTypeDef *hi2c, HAL_I2C_AutoEndModeTypeDef AutoEnd);
 HAL_StatusTypeDef HAL_I2C_Master_WaitTXIS(I2C_HandleTypeDef *hi2c, uint32_t Timeout);
 HAL_StatusTypeDef HAL_I2C_Master_WaitRXNE(I2C_HandleTypeDef *hi2c, uint32_t Timeout);
@@ -427,6 +425,60 @@ HAL_StatusTypeDef HAL_I2C_Slave_Receive_IT(I2C_HandleTypeDef *hi2c, uint8_t *pDa
 HAL_StatusTypeDef HAL_I2C_Slave_Receive_NOSTRETCH_IT(I2C_HandleTypeDef *hi2c, uint8_t *pData, uint16_t DataSize);
 HAL_StatusTypeDef HAL_I2C_Slave_ReceiveSBC_IT(I2C_HandleTypeDef *hi2c, uint8_t *pData, uint16_t DataSize);
 
+
+static inline __attribute__((always_inline)) void HAL_I2C_Disable(I2C_HandleTypeDef *hi2c)
+{
+    hi2c->Instance->CR1 &= ~I2C_CR1_PE_M;
+}
+
+static inline __attribute__((always_inline)) void HAL_I2C_Reset(I2C_HandleTypeDef *hi2c)
+{
+    hi2c->ErrorCode = I2C_ERROR_NONE;
+    
+    hi2c->Instance->CR1 &= ~I2C_CR1_PE_M;
+    hi2c->Instance->CR1 |= I2C_CR1_PE_M;
+}
+
+static inline __attribute__((always_inline)) void HAL_I2C_Enable(I2C_HandleTypeDef *hi2c)
+{
+    hi2c->Instance->CR1 |= I2C_CR1_PE_M;
+}
+
+static inline __attribute__((always_inline)) void HAL_I2C_Reset_Interrupt_Flag(I2C_HandleTypeDef *hi2c, uint32_t mask)
+{
+	hi2c->Instance->ICR |= mask;
+}
+
+static inline __attribute__((always_inline)) void HAL_I2C_Reset_TXDR_Content(I2C_HandleTypeDef *hi2c)
+{
+	hi2c->Instance->ISR |= I2C_ISR_TXE_M;
+}
+
+static inline __attribute__((always_inline)) uint32_t HAL_I2C_Get_Interrupts_Status(I2C_HandleTypeDef *hi2c)
+{
+	return hi2c->Instance->ISR;
+}
+
+static inline __attribute__((always_inline)) uint32_t HAL_I2C_Get_CR1_Content(I2C_HandleTypeDef *hi2c)
+{
+	return hi2c->Instance->CR1;
+}
+
+static inline __attribute__((always_inline)) void HAL_I2C_Write_TXDR(I2C_HandleTypeDef *hi2c, uint8_t value)
+{
+    hi2c->Instance->TXDR = value;
+}
+
+static inline __attribute__((always_inline)) uint8_t HAL_I2C_Get_RXDR(I2C_HandleTypeDef *hi2c)
+{
+    return hi2c->Instance->RXDR;
+}
+
+static inline __attribute__((always_inline)) void HAL_I2C_Clear_Reload(I2C_HandleTypeDef *hi2c)
+{
+	hi2c->Instance->CR2 &= ~I2C_CR2_RELOAD_M;
+}
+
 static inline __attribute__((always_inline)) void HAL_I2C_ADDR_IRQ(I2C_HandleTypeDef *hi2c)
 {
     if (hi2c->Instance->CR1 & I2C_CR1_SBC_M)
diff --git a/cores/arduino/mik32/hal/peripherals/Source/mik32_hal_i2c.c b/cores/arduino/mik32/hal/peripherals/Source/mik32_hal_i2c.c
index 2a2cd16..f44138a 100644
--- a/cores/arduino/mik32/hal/peripherals/Source/mik32_hal_i2c.c
+++ b/cores/arduino/mik32/hal/peripherals/Source/mik32_hal_i2c.c
@@ -26,24 +26,6 @@ __attribute__((weak)) void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
 
 }
 
-void HAL_I2C_Disable(I2C_HandleTypeDef *hi2c)
-{
-    hi2c->Instance->CR1 &= ~I2C_CR1_PE_M;
-}
-
-void HAL_I2C_Reset(I2C_HandleTypeDef *hi2c)
-{
-    hi2c->ErrorCode = I2C_ERROR_NONE;
-    
-    hi2c->Instance->CR1 &= ~I2C_CR1_PE_M;
-    hi2c->Instance->CR1 |= I2C_CR1_PE_M;
-}
-
-void HAL_I2C_Enable(I2C_HandleTypeDef *hi2c)
-{
-    hi2c->Instance->CR1 |= I2C_CR1_PE_M;
-}
-
 void HAL_I2C_AnalogFilterInit(I2C_HandleTypeDef *hi2c, HAL_I2C_AnalogFilterTypeDef AnalogFilter)
 {
     hi2c->Init.AnalogFilter = AnalogFilter;
@@ -244,6 +226,24 @@ HAL_StatusTypeDef HAL_I2C_Init(I2C_HandleTypeDef *hi2c)
     return HAL_OK;
 }
 
+HAL_StatusTypeDef HAL_I2C_Deinit(I2C_HandleTypeDef *hi2c)
+{
+    HAL_I2C_Disable(hi2c);
+
+    if (hi2c->Instance == I2C_0)
+    {
+        __HAL_PCC_I2C_0_CLK_DISABLE();
+        HAL_GPIO_PinConfig(GPIO_0, GPIO_PIN_9 | GPIO_PIN_10, HAL_GPIO_MODE_GPIO_INPUT, HAL_GPIO_PULL_NONE, HAL_GPIO_DS_2MA);
+    }
+    else if(hi2c->Instance == I2C_1)
+    {
+        __HAL_PCC_I2C_1_CLK_DISABLE();
+        HAL_GPIO_PinConfig(GPIO_1, GPIO_PIN_12 | GPIO_PIN_13, HAL_GPIO_MODE_GPIO_INPUT, HAL_GPIO_PULL_NONE, HAL_GPIO_DS_2MA);
+    }
+
+    return HAL_OK;
+}
+
 void HAL_I2C_AutoEnd(I2C_HandleTypeDef *hi2c, HAL_I2C_AutoEndModeTypeDef AutoEnd)
 {
     hi2c->Instance->CR2 &= ~I2C_CR2_AUTOEND_M;
diff --git a/libraries/Wire/src/utility/twi.c b/libraries/Wire/src/utility/twi.c
index 2483806..0d4c86b 100644
--- a/libraries/Wire/src/utility/twi.c
+++ b/libraries/Wire/src/utility/twi.c
@@ -88,36 +88,22 @@ void twi_deinit(void)
 {
   uint32_t EPICmask;
   
-  HAL_I2C_Disable(&hi2c);
-  // disable clock
 #if I2C_NUM == 0
   hi2c.Instance = I2C_0;
   EPICmask = HAL_EPIC_I2C_0_MASK;
-  __HAL_PCC_I2C_0_CLK_DISABLE();
 #elif I2C_NUM == 1
   hi2c.Instance = I2C_1;
   EPICmask = HAL_EPIC_I2C_1_MASK;
-  __HAL_PCC_I2C_1_CLK_DISABLE();
 #else
   #error "Unsupported I2C_NUM value in pins_arduino.h"
 #endif
 
+  HAL_I2C_Deinit(&hi2c);
+
   // for slave mode disable interrupts from i2c
   if (hi2c.Init.Mode == HAL_I2C_MODE_SLAVE) 
     HAL_EPIC_MaskLevelClear(EPICmask);
 
-  // reconfigure pins to z state
-  GPIO_InitTypeDef GPIO_InitStruct;
-  memset(&GPIO_InitStruct, 0, sizeof(GPIO_InitStruct)); 
-  // SDA
-  GPIO_InitStruct.Pin = (HAL_PinsTypeDef)digitalPinToBitMask(PIN_WIRE_SDA);
-  GPIO_InitStruct.Mode = HAL_GPIO_MODE_GPIO_INPUT;
-  GPIO_InitStruct.Pull = HAL_GPIO_PULL_NONE;
-  HAL_GPIO_Init(digitalPinToPort(PIN_WIRE_SDA), &GPIO_InitStruct);
-  // SCL
-  GPIO_InitStruct.Pin = (HAL_PinsTypeDef)digitalPinToBitMask(PIN_WIRE_SCL);
-  HAL_GPIO_Init(digitalPinToPort(PIN_WIRE_SCL), &GPIO_InitStruct);
-
   twiIsOn = false;
 }
 
@@ -252,7 +238,7 @@ uint8_t twi_masterWriteTo(uint8_t address, uint8_t* data, uint8_t length, uint8_
 
   // parse errors
   // check separately, because in hal libraries not all functions look at this
-  if (hi2c.Instance->ISR & I2C_ISR_NACKF_M) 
+  if (HAL_I2C_Get_Interrupts_Status(&hi2c) & I2C_ISR_NACKF_M) 
     hi2c.ErrorCode = I2C_ERROR_NACK;
   if      (hi2c.ErrorCode == (HAL_I2C_ErrorTypeDef)I2C_ERROR_TIMEOUT) ret = I2C_TIMEOUT;    // timeout
   else if (hi2c.ErrorCode == (HAL_I2C_ErrorTypeDef)I2C_ERROR_NACK)    ret = I2C_NACK_DATA;  // didn't receive ACK
@@ -275,39 +261,35 @@ i2c_status_e twi_slaveWrite(uint8_t *txData, uint8_t bytesNum)
   if ((hi2c.ErrorCode != I2C_ERROR_NONE))
     HAL_I2C_Reset(&hi2c);
 
-  // отправка данных
+  // send data
   HAL_StatusTypeDef error_code = HAL_OK;
-
-  hi2c.Instance->CR2 &= ~I2C_CR2_RELOAD_M;
+  HAL_I2C_Clear_Reload(&hi2c);
+  if (!(HAL_I2C_Get_CR1_Content(&hi2c) & I2C_CR1_NOSTRETCH_M))  // NOSTRETCH = 0 
+    HAL_I2C_Reset_TXDR_Content(&hi2c);
+  HAL_I2C_Write_TXDR(&hi2c, txData[0]); // first recording is made in advance
   
-  if (!(hi2c.Instance->CR1 & I2C_CR1_NOSTRETCH_M))  // NOSTRETCH = 0 
-      hi2c.Instance->ISR |= I2C_ISR_TXE_M;          // Reset TXDR contents
-
-  hi2c.Instance->TXDR = txData[0]; // The first recording is made in advance
-  
-  // Запись байта 
+  // write byte 
   for (uint32_t tx_count = 1; tx_count < bytesNum; tx_count++)
   {
       if ((error_code = HAL_I2C_Slave_WaitTXIS(&hi2c, TIMEOUT_TICKS)) != HAL_OK)
       {
-          // неудачная запись
-          hi2c.Instance->ISR |= I2C_ISR_TXE_M;       // Reset TXDR contents
-          hi2c.Instance->ICR |= I2C_ICR_STOPCF_M;    // Clear the STOP detection flag on the bus 
+          // failed to write
+          HAL_I2C_Reset_TXDR_Content(&hi2c);
+          HAL_I2C_Reset_Interrupt_Flag(&hi2c, I2C_ICR_STOPCF_M); // Clear the STOP detection flag on the bus 
           HAL_I2C_Reset(&hi2c);
           return I2C_TIMEOUT;
       }
-      hi2c.Instance->TXDR = txData[tx_count];
+      HAL_I2C_Write_TXDR(&hi2c, txData[tx_count]);
   }
 
   if ((error_code = HAL_I2C_WaitBusy(&hi2c, TIMEOUT_TICKS)) != HAL_OK)
   {
-      // неудачное завершение транзакции
+      // failed to complete transaction
       HAL_I2C_Reset(&hi2c);
       return I2C_TIMEOUT;
   }
-      
-  hi2c.Instance->ISR |= I2C_ISR_TXE_M;       // Reset TXDR contents
-  hi2c.Instance->ICR |= I2C_ICR_STOPCF_M;    // Clear the STOP detection flag on the bus 
+  HAL_I2C_Reset_TXDR_Content(&hi2c);    
+  HAL_I2C_Reset_Interrupt_Flag(&hi2c, I2C_ICR_STOPCF_M); // Clear the STOP detection flag on the bus 
   
   return I2C_OK;
 }
@@ -343,25 +325,24 @@ void twi_attachSlaveTxEvent( void (*function)(void) )
  */
 void twi_interruptHandler(void)
 {
-  uint32_t int_mask = hi2c.Instance->CR1 & I2C_INTMASK; // interrupts allowed
-  uint32_t interrupt_status = hi2c.Instance->ISR;       // current flags
+  uint32_t int_mask = HAL_I2C_Get_CR1_Content(&hi2c) & I2C_INTMASK; // interrupts allowed
+  uint32_t interrupt_status = HAL_I2C_Get_Interrupts_Status(&hi2c); // current flags
 
   // master calls by address, device in slave mode
   if ((interrupt_status & I2C_ISR_ADDR_M) && (int_mask & I2C_CR1_ADDRIE_M))
   {
       // reset ADDR flag
-      hi2c.Instance->ICR |= I2C_ICR_ADDRCF_M;
+      HAL_I2C_Reset_Interrupt_Flag(&hi2c, I2C_ICR_ADDRCF_M);
 
       // look at the transmission direction and respond to the request
       if (interrupt_status & I2C_ISR_DIR_M) // master reads, slave sends
-        // отправляем данные
-        twi_onSlaveTransmit();
+        twi_onSlaveTransmit(); // slave send data
       else                                  // master writes, slave reads
       {
         twi_rxBufferIndex = 0; // write from the beginning of the buffer
         hi2c.State = HAL_I2C_STATE_BUSY;
-        hi2c.Instance->CR2 &= ~I2C_CR2_RELOAD_M;
-        // wait for interrupts because of receiving a byte or a stop condition
+        HAL_I2C_Clear_Reload(&hi2c);
+        // wait for interrupts by receiving a byte or a stop condition
       }
   }
 
@@ -369,15 +350,15 @@ void twi_interruptHandler(void)
   if ((interrupt_status & I2C_ISR_RXNE_M) && (int_mask & I2C_CR1_RXIE_M))
   {
     // put new byte into buffer
-    twi_rxBuffer[twi_rxBufferIndex++] = (uint8_t)hi2c.Instance->RXDR;
+    twi_rxBuffer[twi_rxBufferIndex++] = HAL_I2C_Get_RXDR(&hi2c);
   }
   
   // master sent a STOP to the bus
   if ((interrupt_status & I2C_ISR_STOPF_M) && (int_mask & I2C_CR1_STOPIE_M))
   {
     hi2c.State = HAL_I2C_STATE_END;
-    hi2c.Instance->ISR |= I2C_ISR_TXE_M;    // Reset TXDR contents
-    hi2c.Instance->ICR |= I2C_ICR_STOPCF_M; // Clear the STOP detection flag on the bus 
+    HAL_I2C_Reset_TXDR_Content(&hi2c);
+    HAL_I2C_Reset_Interrupt_Flag(&hi2c, I2C_ICR_STOPCF_M); // Clear the STOP detection flag on the bus 
     // pass the received data to callback function
     twi_onSlaveReceive(twi_rxBuffer, twi_rxBufferIndex);
   }
diff --git a/variants/standart/pins_arduino.h b/variants/standart/pins_arduino.h
index dabd353..3700923 100644
--- a/variants/standart/pins_arduino.h
+++ b/variants/standart/pins_arduino.h
@@ -106,7 +106,7 @@ inline void unblockSpiPin(void)
 // I2C
 #define PIN_WIRE_SDA  (18)
 #define PIN_WIRE_SCL  (19)
-#define I2C_NUM       (1) // i2c number 0 or 1
+#define I2C_NUM       (1) // i2c number 1
 static const uint8_t SDA = PIN_WIRE_SDA;
 static const uint8_t SCL = PIN_WIRE_SCL;
 // available frequencies