[STM32] HAL F1: I2C fix btf / rxne cases

Applying the same fix as in L1 and F4.
This is an alignement to F4 HAL as the same IP is used.

targets/TARGET_STM/TARGET_STM32F1/device/stm32f1xx_hal_i2c.c

@@ -3980,6 +3980,7 @@ static HAL_StatusTypeDef I2C_MasterTransmit_BTF(I2C_HandleTypeDef *hi2c)
   return HAL_OK;
 }
 
+
 /**
   * @brief  Handle RXNE flag for Master
   * @param  hi2c Pointer to a I2C_HandleTypeDef structure that contains
@@ -3988,6 +3989,7 @@ static HAL_StatusTypeDef I2C_MasterTransmit_BTF(I2C_HandleTypeDef *hi2c)
   */
 static HAL_StatusTypeDef I2C_MasterReceive_RXNE(I2C_HandleTypeDef *hi2c)
 {
+
   if(hi2c->State == HAL_I2C_STATE_BUSY_RX)
   {
     uint32_t tmp = 0U;
@@ -4000,35 +4002,25 @@ static HAL_StatusTypeDef I2C_MasterReceive_RXNE(I2C_HandleTypeDef *hi2c)
       hi2c->XferCount--;
     }
     else if((tmp == 2U) || (tmp == 3U))
-    {
-      if(hi2c->XferOptions != I2C_NEXT_FRAME)
     {
       /* Disable Acknowledge */
       hi2c->Instance->CR1 &= ~I2C_CR1_ACK;
 
       /* Enable Pos */
       hi2c->Instance->CR1 |= I2C_CR1_POS;
-      }
-      else
-      {
-        /* Enable Acknowledge */
-        hi2c->Instance->CR1 |= I2C_CR1_ACK;
-      }
       
       /* Disable BUF interrupt */
       __HAL_I2C_DISABLE_IT(hi2c, I2C_IT_BUF);
     }
     else
-    {
-      if(hi2c->XferOptions != I2C_NEXT_FRAME)
     {
       /* Disable Acknowledge */
       hi2c->Instance->CR1 &= ~I2C_CR1_ACK;
-      }
+
-      else
+      if(hi2c->XferOptions == I2C_NEXT_FRAME)
       {
-        /* Enable Acknowledge */
+        /* Enable Pos */
-        hi2c->Instance->CR1 |= I2C_CR1_ACK;
+        hi2c->Instance->CR1 |= I2C_CR1_POS;
       }
 
       /* Disable EVT, BUF and ERR interrupt */
@@ -4038,17 +4030,17 @@ static HAL_StatusTypeDef I2C_MasterReceive_RXNE(I2C_HandleTypeDef *hi2c)
       (*hi2c->pBuffPtr++) = hi2c->Instance->DR;
       hi2c->XferCount--;
 
+      tmp = (uint32_t)(hi2c->State) & I2C_STATE_MSK;
+      hi2c->PreviousState = tmp | (uint32_t)(hi2c->Mode);
       hi2c->State = HAL_I2C_STATE_READY;
 
       if(hi2c->Mode == HAL_I2C_MODE_MEM)
       {
-        hi2c->PreviousState = I2C_STATE_NONE;
         hi2c->Mode = HAL_I2C_MODE_NONE;
         HAL_I2C_MemRxCpltCallback(hi2c);
       }
       else
       {
-        hi2c->PreviousState = I2C_STATE_MASTER_BUSY_RX;
         hi2c->Mode = HAL_I2C_MODE_NONE;
         HAL_I2C_MasterRxCpltCallback(hi2c);
       }
@@ -4066,6 +4058,7 @@ static HAL_StatusTypeDef I2C_MasterReceive_RXNE(I2C_HandleTypeDef *hi2c)
 static HAL_StatusTypeDef I2C_MasterReceive_BTF(I2C_HandleTypeDef *hi2c)
 {
   /* Declaration of temporary variables to prevent undefined behavior of volatile usage */
+  uint32_t tmp;
   uint32_t CurrentXferOptions = hi2c->XferOptions;
 
   if(hi2c->XferCount == 3U)
@@ -4084,25 +4077,21 @@ static HAL_StatusTypeDef I2C_MasterReceive_BTF(I2C_HandleTypeDef *hi2c)
   {
     /* Prepare next transfer or stop current transfer */
     if((CurrentXferOptions != I2C_FIRST_AND_LAST_FRAME) && (CurrentXferOptions != I2C_LAST_FRAME) && (CurrentXferOptions != I2C_NO_OPTION_FRAME))
-    {
-      if(CurrentXferOptions != I2C_NEXT_FRAME)
     {
       /* Disable Acknowledge */
       hi2c->Instance->CR1 &= ~I2C_CR1_ACK;
-      }
-      else
-      {
-        /* Enable Acknowledge */
-        hi2c->Instance->CR1 |= I2C_CR1_ACK;
-      }
 
-      /* Disable EVT and ERR interrupt */
+      if((CurrentXferOptions == I2C_NEXT_FRAME) || (CurrentXferOptions == I2C_FIRST_FRAME))
-      __HAL_I2C_DISABLE_IT(hi2c, I2C_IT_EVT | I2C_IT_ERR);
+      {
+        /* Generate Start */
+        hi2c->Instance->CR1 |= I2C_CR1_START;
+      }
+      tmp = (uint32_t)(hi2c->State) & I2C_STATE_MSK;
+      hi2c->PreviousState = tmp | (uint32_t)(hi2c->Mode);
     }
     else
     {
-      /* Disable EVT and ERR interrupt */
+      hi2c->PreviousState = I2C_STATE_MASTER_BUSY_RX;
-      __HAL_I2C_DISABLE_IT(hi2c, I2C_IT_EVT | I2C_IT_ERR);
 
       /* Generate Stop */
       hi2c->Instance->CR1 |= I2C_CR1_STOP;
@@ -4116,18 +4105,20 @@ static HAL_StatusTypeDef I2C_MasterReceive_BTF(I2C_HandleTypeDef *hi2c)
     (*hi2c->pBuffPtr++) = hi2c->Instance->DR;
     hi2c->XferCount--;
 
+    /* Disable EVT and ERR interrupt */
+    __HAL_I2C_DISABLE_IT(hi2c, I2C_IT_EVT | I2C_IT_ERR);
+
     hi2c->State = HAL_I2C_STATE_READY;
+    hi2c->PreviousState = I2C_STATE_NONE;
 
     if(hi2c->Mode == HAL_I2C_MODE_MEM)
     {
-      hi2c->PreviousState = I2C_STATE_NONE;
       hi2c->Mode = HAL_I2C_MODE_NONE;
 
       HAL_I2C_MemRxCpltCallback(hi2c);
     }
     else
     {
-      hi2c->PreviousState = I2C_STATE_MASTER_BUSY_RX;
       hi2c->Mode = HAL_I2C_MODE_NONE;
 
       HAL_I2C_MasterRxCpltCallback(hi2c);
@@ -4142,6 +4133,7 @@ static HAL_StatusTypeDef I2C_MasterReceive_BTF(I2C_HandleTypeDef *hi2c)
   return HAL_OK;
 }
 
+
 /**
   * @brief  Handle SB flag for Master
   * @param  hi2c Pointer to a I2C_HandleTypeDef structure that contains