[L1] I2C HAL fix: generate Start only once Stop is finished

Author: ABOSTM

system/Drivers/STM32L1xx_HAL_Driver/Src/stm32l1xx_hal_i2c.c

@@ -3416,6 +3416,27 @@ HAL_StatusTypeDef HAL_I2C_Master_Seq_Transmit_IT(I2C_HandleTypeDef *hi2c, uint16
       while (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BUSY) != RESET);
     }
 
+    /* Before any new treatment like start or restart, check that there is no pending STOP request */
+    /* Wait until STOP flag is reset */
+    count = I2C_TIMEOUT_BUSY_FLAG * (SystemCoreClock / 25U / 1000U);
+    do
+    {
+      count--;
+      if (count == 0U)
+      {
+        hi2c->PreviousState       = I2C_STATE_NONE;
+        hi2c->State               = HAL_I2C_STATE_READY;
+        hi2c->Mode                = HAL_I2C_MODE_NONE;
+        hi2c->ErrorCode           |= HAL_I2C_ERROR_TIMEOUT;
+
+        /* Process Unlocked */
+        __HAL_UNLOCK(hi2c);
+
+        return HAL_ERROR;
+      }
+    }
+    while (READ_BIT(hi2c->Instance->CR1, I2C_CR1_STOP) == I2C_CR1_STOP);
+
     /* Process Locked */
     __HAL_LOCK(hi2c);
 
@@ -3515,6 +3536,27 @@ HAL_StatusTypeDef HAL_I2C_Master_Seq_Transmit_DMA(I2C_HandleTypeDef *hi2c, uint1
       while (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BUSY) != RESET);
     }
 
+    /* Before any new treatment like start or restart, check that there is no pending STOP request */
+    /* Wait until STOP flag is reset */
+    count = I2C_TIMEOUT_BUSY_FLAG * (SystemCoreClock / 25U / 1000U);
+    do
+    {
+      count--;
+      if (count == 0U)
+      {
+        hi2c->PreviousState       = I2C_STATE_NONE;
+        hi2c->State               = HAL_I2C_STATE_READY;
+        hi2c->Mode                = HAL_I2C_MODE_NONE;
+        hi2c->ErrorCode           |= HAL_I2C_ERROR_TIMEOUT;
+
+        /* Process Unlocked */
+        __HAL_UNLOCK(hi2c);
+
+        return HAL_ERROR;
+      }
+    }
+    while (READ_BIT(hi2c->Instance->CR1, I2C_CR1_STOP) == I2C_CR1_STOP);
+
     /* Process Locked */
     __HAL_LOCK(hi2c);
 
@@ -3681,6 +3723,27 @@ HAL_StatusTypeDef HAL_I2C_Master_Seq_Receive_IT(I2C_HandleTypeDef *hi2c, uint16_
       while (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BUSY) != RESET);
     }
 
+    /* Before any new treatment like start or restart, check that there is no pending STOP request */
+    /* Wait until STOP flag is reset */
+    count = I2C_TIMEOUT_BUSY_FLAG * (SystemCoreClock / 25U / 1000U);
+    do
+    {
+      count--;
+      if (count == 0U)
+      {
+        hi2c->PreviousState       = I2C_STATE_NONE;
+        hi2c->State               = HAL_I2C_STATE_READY;
+        hi2c->Mode                = HAL_I2C_MODE_NONE;
+        hi2c->ErrorCode           |= HAL_I2C_ERROR_TIMEOUT;
+
+        /* Process Unlocked */
+        __HAL_UNLOCK(hi2c);
+
+        return HAL_ERROR;
+      }
+    }
+    while (READ_BIT(hi2c->Instance->CR1, I2C_CR1_STOP) == I2C_CR1_STOP);
+
     /* Process Locked */
     __HAL_LOCK(hi2c);
 
@@ -3798,6 +3861,27 @@ HAL_StatusTypeDef HAL_I2C_Master_Seq_Receive_DMA(I2C_HandleTypeDef *hi2c, uint16
       while (__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BUSY) != RESET);
     }
 
+    /* Before any new treatment like start or restart, check that there is no pending STOP request */
+    /* Wait until STOP flag is reset */
+    count = I2C_TIMEOUT_BUSY_FLAG * (SystemCoreClock / 25U / 1000U);
+    do
+    {
+      count--;
+      if (count == 0U)
+      {
+        hi2c->PreviousState       = I2C_STATE_NONE;
+        hi2c->State               = HAL_I2C_STATE_READY;
+        hi2c->Mode                = HAL_I2C_MODE_NONE;
+        hi2c->ErrorCode           |= HAL_I2C_ERROR_TIMEOUT;
+
+        /* Process Unlocked */
+        __HAL_UNLOCK(hi2c);
+
+        return HAL_ERROR;
+      }
+    }
+    while (READ_BIT(hi2c->Instance->CR1, I2C_CR1_STOP) == I2C_CR1_STOP);
+
     /* Process Locked */
     __HAL_LOCK(hi2c);
 
@@ -4465,7 +4549,7 @@ HAL_StatusTypeDef HAL_I2C_Master_Abort_IT(I2C_HandleTypeDef *hi2c, uint16_t DevA
   UNUSED(DevAddress);
 
   /* Abort Master transfer during Receive or Transmit process    */
-  if (hi2c->Mode == HAL_I2C_MODE_MASTER)
+  if ((__HAL_I2C_GET_FLAG(hi2c, I2C_FLAG_BUSY) != RESET) && (hi2c->Mode == HAL_I2C_MODE_MASTER))
   {
     /* Process Locked */
     __HAL_LOCK(hi2c);
@@ -4496,6 +4580,7 @@ HAL_StatusTypeDef HAL_I2C_Master_Abort_IT(I2C_HandleTypeDef *hi2c, uint16_t DevA
   {
     /* Wrong usage of abort function */
     /* This function should be used only in case of abort monitored by master device */
+    /* Or periphal is not in busy state, mean there is no active sequence to be abort */
     return HAL_ERROR;
   }
 }