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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/infineon/include/ifx_i2c_data_link_layer.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/infineon/include/ifx_i2c_data_link_layer.h
new file mode 100644
index 0000000..ae89ff3
--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/infineon/include/ifx_i2c_data_link_layer.h
@@ -0,0 +1,103 @@
+/**
+* \copyright
+* Copyright (c) 2018, Infineon Technologies AG
+* All rights reserved.                                                         
+*
+* This software is provided with terms and conditions as specified in OPTIGA(TM) Trust X Evaluation Kit License Agreement.
+* \endcopyright
+*
+* \author Infineon AG
+*
+* \file ifx_i2c_data_link_layer.h
+*
+* \brief   This file defines the API prototype for data link layer of the Infineon I2C Protocol Stack library.
+*
+* \addtogroup  grIFXI2C
+* @{
+*/
+
+#ifndef _IFX_I2C_DATA_LINK_LAYER_H_
+#define _IFX_I2C_DATA_LINK_LAYER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    
+/***********************************************************************************************************************
+* HEADER FILES
+**********************************************************************************************************************/
+#include "ifx_i2c_config.h"
+
+/***********************************************************************************************************************
+* MACROS
+**********************************************************************************************************************/
+/** @brief Error event propagated to upper layer */
+#define IFX_I2C_DL_EVENT_ERROR              (0x01)
+/** @brief Transmit success event propagated to upper layer (bit field 1) */
+#define IFX_I2C_DL_EVENT_TX_SUCCESS         (0x02)
+/** @brief Receive success event propagated to upper layer (bit field 3)*/
+#define IFX_I2C_DL_EVENT_RX_SUCCESS         (0x04)
+
+/***********************************************************************************************************************
+* ENUMS
+**********************************************************************************************************************/
+/***********************************************************************************************************************
+* DATA STRUCTURES
+***********************************************************************************************************************/
+/***********************************************************************************************************************
+* API PROTOTYPES
+**********************************************************************************************************************/
+/**
+ * @brief Function for initializing the module.
+ *
+ * Function initializes and enables the module and registers
+ * an event handler to receive events from this module.
+ * @attention This function must be called before using the module.
+ *
+ * @param[in,out] p_ctx     Pointer to ifx i2c context.
+ * @param[in] handler     Function pointer to the event handler of the upper layer.
+ *
+ * @retval  IFX_I2C_STACK_SUCCESS If initialization was successful.
+ * @retval  IFX_I2C_STACK_ERROR If the module is already initialized.
+ */
+host_lib_status_t ifx_i2c_dl_init(ifx_i2c_context_t *p_ctx,ifx_i2c_event_handler_t handler);
+
+/**
+ * @brief Function for sending a frame.
+ *
+ * Asynchronous function to send a frame. The function returns immediately.
+ * One of the following events is propagated to the event handler registered
+ * with @ref ifx_i2c_dl_init.
+ *
+ * @param[in,out] p_ctx     Pointer to ifx i2c context.
+ * @param[in] frame_len     Frame length.
+ *
+ * @retval  IFX_I2C_STACK_SUCCESS If function was successful.
+ * @retval  IFX_I2C_STACK_ERROR If the module is busy.
+ */
+host_lib_status_t ifx_i2c_dl_send_frame(ifx_i2c_context_t *p_ctx,uint16_t frame_len);
+
+/**
+ * @brief Function for receiving a frame.
+ *
+ * Asynchronous function to receive a frame. The function returns immediately.
+ * One of the following events is propagated to the event handler registered
+ * with @ref ifx_i2c_dl_init.
+ *
+ * @param[in,out] p_ctx     Pointer to ifx i2c context.
+ *
+ * @retval  IFX_I2C_STACK_SUCCESS If function was successful.
+ * @retval  IFX_I2C_STACK_ERROR If the module is busy.
+ */
+host_lib_status_t ifx_i2c_dl_receive_frame(ifx_i2c_context_t *p_ctx);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _IFX_I2C_DATA_LINK_LAYER_H_ */
+
+
+/**
+ * @}
+ **/