Enable CAN Bus

Core/Inc/FreeRTOSConfig.h

@@ -80,6 +80,9 @@
 #define configTIMER_QUEUE_LENGTH                 10
 #define configTIMER_TASK_STACK_DEPTH             256
 
+/* The following flag must be enabled only when using newlib */
+#define configUSE_NEWLIB_REENTRANT          1
+
 /* Set the following definitions to 1 to include the API function, or zero
 to exclude the API function. */
 #define INCLUDE_vTaskPrioritySet            1

Core/Inc/can.h

@@ -0,0 +1,52 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file    can.h
+  * @brief   This file contains all the function prototypes for
+  *          the can.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 __CAN_H__
+#define __CAN_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "main.h"
+
+/* USER CODE BEGIN Includes */
+
+/* USER CODE END Includes */
+
+extern CAN_HandleTypeDef hcan;
+
+/* USER CODE BEGIN Private defines */
+
+/* USER CODE END Private defines */
+
+void MX_CAN_Init(void);
+
+/* USER CODE BEGIN Prototypes */
+
+/* USER CODE END Prototypes */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __CAN_H__ */
+

Core/Inc/stm32f1xx_hal_conf.h

@@ -36,7 +36,7 @@
 #define HAL_MODULE_ENABLED
   #define HAL_ADC_MODULE_ENABLED
 /*#define HAL_CRYP_MODULE_ENABLED   */
-/*#define HAL_CAN_MODULE_ENABLED   */
+#define HAL_CAN_MODULE_ENABLED
 /*#define HAL_CAN_LEGACY_MODULE_ENABLED   */
 /*#define HAL_CEC_MODULE_ENABLED   */
 /*#define HAL_CORTEX_MODULE_ENABLED   */

Core/Src/can.c

@@ -0,0 +1,120 @@
+/* USER CODE BEGIN Header */
+/**
+  ******************************************************************************
+  * @file    can.c
+  * @brief   This file provides code for the configuration
+  *          of the CAN instances.
+  ******************************************************************************
+  * @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 */
+/* Includes ------------------------------------------------------------------*/
+#include "can.h"
+
+/* USER CODE BEGIN 0 */
+
+/* USER CODE END 0 */
+
+CAN_HandleTypeDef hcan;
+
+/* CAN init function */
+void MX_CAN_Init(void)
+{
+
+  /* USER CODE BEGIN CAN_Init 0 */
+
+  /* USER CODE END CAN_Init 0 */
+
+  /* USER CODE BEGIN CAN_Init 1 */
+
+  /* USER CODE END CAN_Init 1 */
+  hcan.Instance = CAN1;
+  hcan.Init.Prescaler = 16;
+  hcan.Init.Mode = CAN_MODE_NORMAL;
+  hcan.Init.SyncJumpWidth = CAN_SJW_1TQ;
+  hcan.Init.TimeSeg1 = CAN_BS1_1TQ;
+  hcan.Init.TimeSeg2 = CAN_BS2_1TQ;
+  hcan.Init.TimeTriggeredMode = DISABLE;
+  hcan.Init.AutoBusOff = DISABLE;
+  hcan.Init.AutoWakeUp = DISABLE;
+  hcan.Init.AutoRetransmission = DISABLE;
+  hcan.Init.ReceiveFifoLocked = DISABLE;
+  hcan.Init.TransmitFifoPriority = DISABLE;
+  if (HAL_CAN_Init(&hcan) != HAL_OK)
+  {
+    Error_Handler();
+  }
+  /* USER CODE BEGIN CAN_Init 2 */
+
+  /* USER CODE END CAN_Init 2 */
+
+}
+
+void HAL_CAN_MspInit(CAN_HandleTypeDef* canHandle)
+{
+
+  GPIO_InitTypeDef GPIO_InitStruct = {0};
+  if(canHandle->Instance==CAN1)
+  {
+  /* USER CODE BEGIN CAN1_MspInit 0 */
+
+  /* USER CODE END CAN1_MspInit 0 */
+    /* CAN1 clock enable */
+    __HAL_RCC_CAN1_CLK_ENABLE();
+
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    /**CAN GPIO Configuration
+    PA11     ------> CAN_RX
+    PA12     ------> CAN_TX
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_11;
+    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+    GPIO_InitStruct.Pin = GPIO_PIN_12;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+  /* USER CODE BEGIN CAN1_MspInit 1 */
+
+  /* USER CODE END CAN1_MspInit 1 */
+  }
+}
+
+void HAL_CAN_MspDeInit(CAN_HandleTypeDef* canHandle)
+{
+
+  if(canHandle->Instance==CAN1)
+  {
+  /* USER CODE BEGIN CAN1_MspDeInit 0 */
+
+  /* USER CODE END CAN1_MspDeInit 0 */
+    /* Peripheral clock disable */
+    __HAL_RCC_CAN1_CLK_DISABLE();
+
+    /**CAN GPIO Configuration
+    PA11     ------> CAN_RX
+    PA12     ------> CAN_TX
+    */
+    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_11|GPIO_PIN_12);
+
+  /* USER CODE BEGIN CAN1_MspDeInit 1 */
+
+  /* USER CODE END CAN1_MspDeInit 1 */
+  }
+}
+
+/* USER CODE BEGIN 1 */
+
+/* USER CODE END 1 */

Core/Src/gpio.c

@@ -67,9 +67,9 @@ void MX_GPIO_Init(void)
   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
   /*Configure GPIO pins : PA6 PA7 PA9 PA10
-                           PA11 PA12 PA15 */
+                           PA15 */
   GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7|GPIO_PIN_9|GPIO_PIN_10
-                          |GPIO_PIN_11|GPIO_PIN_12|GPIO_PIN_15;
+                          |GPIO_PIN_15;
   GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
   HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 

Core/Src/main.c

@@ -20,6 +20,7 @@
 #include "main.h"
 #include "cmsis_os.h"
 #include "adc.h"
+#include "can.h"
 #include "dma.h"
 #include "i2c.h"
 #include "gpio.h"
@@ -96,6 +97,7 @@ int main(void)
   MX_DMA_Init();
   MX_ADC1_Init();
   MX_I2C1_Init();
+  MX_CAN_Init();
   /* USER CODE BEGIN 2 */
 
   LOG_INFO("main: Start I²C listener");