Working CAN sending on TACOS via user space

Core/Inc/usart.h

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+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file    usart.h
+  * @brief   This file contains all the function prototypes for
+  *          the usart.c file
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2023 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.
+  *
+  ******************************************************************************
+  */
+/* USER CODE END Header */
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __USART_H__
+#define __USART_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+
+/* USER CODE BEGIN Includes */
+
+/* USER CODE END Includes */
+
+extern UART_HandleTypeDef huart4;
+
+/* USER CODE BEGIN Private defines */
+
+/* USER CODE END Private defines */
+
+void MX_UART4_Init(void);
+
+/* USER CODE BEGIN Prototypes */
+
+/* USER CODE END Prototypes */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __USART_H__ */
+