@@ -0,0 +1,79 @@
+/**
+  ******************************************************************************
+  * @file    stm32_external_env.h
+  * @brief   External environments values (external oscillators values).
+  *          This file should be copied to the application folder.
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2026 STMicroelectronics.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
+  ******************************************************************************
+  */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef STM32_EXTERNAL_ENV_H
+#define STM32_EXTERNAL_ENV_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+
+/* ########################## VDD Value #######################################*/
+/**
+  * @brief VDD Value.
+  */
+#if !defined  (VDD_VALUE)
+#define  VDD_VALUE             3300UL /*!< Value of VDD in mv */
+#endif /* VDD_VALUE */
+
+/* ########################## Oscillator Values adaptation ####################*/
+/**
+  * @brief Adjust the value of External High Speed oscillator (HSE) used in your application.
+  *        This value is used by the RCC HAL module to compute the system frequency
+  *        (when HSE is used as system clock source, directly or through the PSI).
+  */
+#if !defined  (HSE_VALUE)
+#if defined(RCC_CR1_HSIDIV4ON)
+#define HSE_VALUE              16000000UL /*!< Value of the External oscillator in Hz */
+#else
+#if defined(AHB4PERIPH_BASE)
+#define HSE_VALUE              48000000UL /*!< Value of the External oscillator in Hz */
+#else
+#define HSE_VALUE              24000000UL /*!< Value of the External oscillator in Hz */
+#endif /* AHB4PERIPH_BASE */
+#endif /* RCC_CR1_HSIDIV4ON */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSE_STARTUP_TIMEOUT)
+#define HSE_STARTUP_TIMEOUT    100UL   /*!< Time out for HSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/**
+  * @brief External Low Speed oscillator (LSE) value.
+  *        This value is used by the UART, RTC HAL module to compute the system frequency
+  */
+#if !defined  (LSE_VALUE)
+#define LSE_VALUE              32768UL   /*!< Value of the External oscillator in Hz*/
+#endif /* LSE_VALUE */
+
+#if !defined  (LSE_STARTUP_TIMEOUT)
+#define LSE_STARTUP_TIMEOUT    5000UL     /*!< Time out for LSE start up, in ms */
+#endif /* HSE_STARTUP_TIMEOUT */
+
+/* Tip: To avoid modifying this file each time you need to use different HSE,
+   ===  you can define the HSE value in your toolchain compiler preprocessor. */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* STM32_EXTERNAL_ENV_H */