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diff --git a/lib/stm32f1/hal/source/stm32f1xx_hal_gpio_ex.c b/lib/stm32f1/hal/source/stm32f1xx_hal_gpio_ex.c
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index 00000000..c2d810c9
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+++ b/lib/stm32f1/hal/source/stm32f1xx_hal_gpio_ex.c
@@ -0,0 +1,127 @@
+/**
+  ******************************************************************************
+  * @file    stm32f1xx_hal_gpio_ex.c
+  * @author  MCD Application Team
+  * @brief   GPIO Extension HAL module driver.
+  *         This file provides firmware functions to manage the following
+  *          functionalities of the General Purpose Input/Output (GPIO) extension peripheral.
+  *           + Extended features functions
+  *
+  @verbatim
+  ==============================================================================
+                    ##### GPIO Peripheral extension features #####
+  ==============================================================================
+  [..] GPIO module on STM32F1 family, manage also the AFIO register:
+       (+) Possibility to use the EVENTOUT Cortex feature
+
+                     ##### How to use this driver #####
+  ==============================================================================
+  [..] This driver provides functions to use EVENTOUT Cortex feature
+    (#) Configure EVENTOUT Cortex feature using the function HAL_GPIOEx_ConfigEventout()
+    (#) Activate EVENTOUT Cortex feature using the HAL_GPIOEx_EnableEventout()
+    (#) Deactivate EVENTOUT Cortex feature using the HAL_GPIOEx_DisableEventout()
+
+  @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f1xx_hal.h"
+
+/** @addtogroup STM32F1xx_HAL_Driver
+  * @{
+  */
+
+/** @defgroup GPIOEx GPIOEx
+  * @brief GPIO HAL module driver
+  * @{
+  */
+
+#ifdef HAL_GPIO_MODULE_ENABLED
+
+/** @defgroup GPIOEx_Exported_Functions GPIOEx Exported Functions
+  * @{
+  */
+
+/** @defgroup GPIOEx_Exported_Functions_Group1 Extended features functions
+ *  @brief    Extended features functions
+ *
+@verbatim
+  ==============================================================================
+                 ##### Extended features functions #####
+  ==============================================================================
+    [..]  This section provides functions allowing to:
+    (+) Configure EVENTOUT Cortex feature using the function HAL_GPIOEx_ConfigEventout()
+    (+) Activate EVENTOUT Cortex feature using the HAL_GPIOEx_EnableEventout()
+    (+) Deactivate EVENTOUT Cortex feature using the HAL_GPIOEx_DisableEventout()
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Configures the port and pin on which the EVENTOUT Cortex signal will be connected.
+  * @param  GPIO_PortSource Select the port used to output the Cortex EVENTOUT signal.
+  *   This parameter can be a value of @ref GPIOEx_EVENTOUT_PORT.
+  * @param  GPIO_PinSource Select the pin used to output the Cortex EVENTOUT signal.
+  *   This parameter can be a value of @ref GPIOEx_EVENTOUT_PIN.
+  * @retval None
+  */
+void HAL_GPIOEx_ConfigEventout(uint32_t GPIO_PortSource, uint32_t GPIO_PinSource)
+{
+  /* Verify the parameters */
+  assert_param(IS_AFIO_EVENTOUT_PORT(GPIO_PortSource));
+  assert_param(IS_AFIO_EVENTOUT_PIN(GPIO_PinSource));
+
+  /* Apply the new configuration */
+  MODIFY_REG(AFIO->EVCR, (AFIO_EVCR_PORT) | (AFIO_EVCR_PIN), (GPIO_PortSource) | (GPIO_PinSource));
+}
+
+/**
+  * @brief  Enables the Event Output.
+  * @retval None
+  */
+void HAL_GPIOEx_EnableEventout(void)
+{
+  SET_BIT(AFIO->EVCR, AFIO_EVCR_EVOE);
+}
+
+/**
+  * @brief  Disables the Event Output.
+  * @retval None
+  */
+void HAL_GPIOEx_DisableEventout(void)
+{
+  CLEAR_BIT(AFIO->EVCR, AFIO_EVCR_EVOE);
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#endif /* HAL_GPIO_MODULE_ENABLED */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/