[问答]

如何使用STM32F103和CAN收发器完成项目？

问答对人有帮助，内容完整，我也想知道答案 0 大家好，我一直在尝试重新编程一些模块，这些模块用于在插入 OBD 插座时将一些 CAN 数据帧传输到汽车。基本上 MCU 被编程为发送一些帧，我想用其他帧替换这些帧。这是设备的图片以及我制作的原理图： MCU是STM32F103C8T6，CAN收发器上面写着“NXP A1040/C DBA000 D64.1”。当我在 Google 中输入它时，它会返回 TJA1040 高速 CAN 收发器：https ://www.nxp.com/docs/en/data-sheet/TJA1040.pdf 。所以我做了一些研究并开始了我的项目。这是我在 MX 中使用的配置：我首先尝试使用蜂鸣器来测试基础知识并且它有效。然后我的下一步是使用 CAN 环回模式来尝试看看我是否可以发送/接收消息。这就是我挣扎的地方。我加入了下面的整个代码。它编译并运行（我使用ST链接进行调试）。它只是永远不会进入应该激活蜂鸣器的中断功能。请注意，在我的测试期间，收发器由来自 ST 链路的 5V 正确供电（我用万用表检查过）。我真的不知道我的问题是什么，任何帮助将不胜感激。提前致谢！ /* USER CODE BEGIN Header / /* ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2022 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 "main.h" / Private includes ----------------------------------------------------------/ / USER CODE BEGIN Includes / / USER CODE END Includes / / Private typedef -----------------------------------------------------------/ / USER CODE BEGIN PTD / / USER CODE END PTD / / Private define ------------------------------------------------------------/ / USER CODE BEGIN PD / / USER CODE END PD / / Private macro -------------------------------------------------------------/ / USER CODE BEGIN PM / / USER CODE END PM / / Private variables ---------------------------------------------------------/ CAN_HandleTypeDef hcan; / USER CODE BEGIN PV / / USER CODE END PV / / Private function prototypes -----------------------------------------------/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_CAN_Init(void); / USER CODE BEGIN PFP / / USER CODE END PFP / / Private user code ---------------------------------------------------------/ / USER CODE BEGIN 0 / CAN_TxHeaderTypeDef TxHeader; CAN_RxHeaderTypeDef RxHeader; uint32_t Mailbox; uint8_t TxData[8]; uint8_t RxData[8]; uint8_t count = 0; void HAL_CAN_RxFifo0MsgPendingCallback(CAN_HandleTypeDef hcan) { HAL_CAN_GetRxMessage(hcan, CAN_RX_FIFO0, &RxHeader, RxData); HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, 1); HAL_Delay(100); HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, 0); } /* USER CODE END 0 / /* * @brief The application entry point. * @retval int / int main(void) { / USER CODE BEGIN 1 / / USER CODE END 1 / / MCU Configuration--------------------------------------------------------/ / Reset of all peripherals, Initializes the Flash interface and the Systick. / HAL_Init(); / USER CODE BEGIN Init / / USER CODE END Init / / Configure the system clock / SystemClock_Config(); / USER CODE BEGIN SysInit / / USER CODE END SysInit / / Initialize all configured peripherals / MX_GPIO_Init(); MX_CAN_Init(); / USER CODE BEGIN 2 / HAL_CAN_Start(&hcan); HAL_CAN_ActivateNotification(&hcan, CAN_IT_RX_FIFO0_MSG_PENDING); TxHeader.DLC = 1; TxHeader.ExtId = 0; TxHeader.IDE = CAN_ID_STD; TxHeader.RTR = CAN_RTR_DATA; TxHeader.StdId = 0x103; TxHeader.TransmitGlobalTime = DISABLE; TxData[0] = 0xf3; HAL_CAN_AddTxMessage(&hcan, &TxHeader, TxData, &Mailbox); / USER CODE END 2 / / Infinite loop / / USER CODE BEGIN WHILE / while (1) { HAL_CAN_AddTxMessage(&hcan, &TxHeader, TxData, &Mailbox); HAL_Delay(5000); / USER CODE END WHILE / / USER CODE BEGIN 3 / } / USER CODE END 3 / } /* * @brief System Clock Configuration * @retval None / void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /* Initializes the RCC Oscillators according to the specified parameters * in the RCC_OscInitTypeDef structure. / RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /* Initializes the CPU, AHB and APB buses clocks / RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK\|RCC_CLOCKTYPE_SYSCLK \|RCC_CLOCKTYPE_PCLK1\|RCC_CLOCKTYPE_PCLK2; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) { Error_Handler(); } } /* * @brief CAN Initialization Function * @param None * @retval None / static 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 = 18; hcan.Init.Mode = CAN_MODE_LOOPBACK; hcan.Init.SyncJumpWidth = CAN_SJW_1TQ; hcan.Init.TimeSeg1 = CAN_BS1_1TQ; hcan.Init.TimeSeg2 = CAN_BS2_2TQ; 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 / CAN_FilterTypeDef canfilterconfig; canfilterconfig.FilterActivation = CAN_FILTER_DISABLE; canfilterconfig.FilterBank = 10; canfilterconfig.FilterFIFOAssignment = CAN_RX_FIFO0; canfilterconfig.FilterIdHigh = 0; canfilterconfig.FilterIdLow = 0x0000; canfilterconfig.FilterMaskIdHigh = 0; canfilterconfig.FilterMaskIdLow = 0x0000; canfilterconfig.FilterMode = CAN_FILTERMODE_IDMASK; canfilterconfig.FilterScale = CAN_FILTERSCALE_32BIT; canfilterconfig.SlaveStartFilterBank = 12; HAL_CAN_ConfigFilter(&hcan, &canfilterconfig); / USER CODE END CAN_Init 2 / } /* * @brief GPIO Initialization Function * @param None * @retval None / static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; / GPIO Ports Clock Enable / __HAL_RCC_GPIOD_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); /Configure GPIO pin Output Level / HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET); /Configure GPIO pin : PA5 / GPIO_InitStruct.Pin = GPIO_PIN_5; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); } / USER CODE BEGIN 4 / / USER CODE END 4 / /* * @brief This function is executed in case of error occurrence. * @retval None / void Error_Handler(void) { / USER CODE BEGIN Error_Handler_Debug / / User can add his own implementation to report the HAL error return state / __disable_irq(); while (1) { } / USER CODE END Error_Handler_Debug / } #ifdef USE_FULL_ASSERT /* * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None / void assert_failed(uint8_t file, uint32_t line) { /* USER CODE BEGIN 6 / / User can add his own implementation to report the file name and line number, ex: printf("Wrong parameters value: file %s on line %d ", file, line) / / USER CODE END 6 / } #endif / USE_FULL_ASSERT */ 0
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答案对人有帮助，有参考价值 0 请尽可能减少预分频器并增加 BS1 和 BS2 以匹配您的 500kb/s 比特率我建议例如：预分频器 = 4 位段 1 = 11 次位段 2 = 6 次 PS：如果您禁用过滤器，您将无法接收任何帧；CAN 单元将确认接收到的帧，但帧的数据不会进入您的 FIFO。

2022-12-12 10:55:33 评论举报潘琳