[问答]

为什么无法在STM32F407 UART设置中查询RS485时传输我的数据呢？

问答对人有帮助，内容完整，我也想知道答案 0 我无法在查询 rs485 时传输我的数据。因此也没有接收到数据。我在能量计和我的 uart 中也选择了波特率 9600。我选择了 USART1，PA9 tx，PA10 rx 和 GPIO PD11，使用的模块是 Max485 模块。因此，在检查表达式时，无法收到任何内容，到处都是 0。Modbus_Rtu[0]=1; Modbus_Rtu[1]=3； Modbus_Rtu[2]=0； Modbus_Rtu[3]=0； Modbus_Rtu[4]=1; Modbus_Rtu[5]=5；如果 Slave ID 错误，那么传输时至少应该有值.....这是我的代码和 scrrenshot /* USER CODE BEGIN Header / /* ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * © Copyright (c) 2021 STMicroelectronics. * All rights reserved. * * This software component is licensed by ST under Ultimate Liberty license * SLA0044, the "License"; You may not use this file except in compliance with * the License. You may obtain a copy of the License at: * * ****************************************************************************** / / USER CODE END Header / / Includes ------------------------------------------------------------------/ #include "main.h" / Private includes ----------------------------------------------------------/ / USER CODE BEGIN Includes / uint8_t Modbus_Rtu[8]; uint8_t Modbus_Rtucevap[9]; uint16_t CRC_Control; / 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 ---------------------------------------------------------/ UART_HandleTypeDef huart1; DMA_HandleTypeDef hdma_usart1_rx; / USER CODE BEGIN PV / / USER CODE END PV / / Private function prototypes -----------------------------------------------/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_DMA_Init(void); static void MX_USART1_UART_Init(void); / USER CODE BEGIN PFP / uint16_t ModRtu_CRC(uint8_t buf[8], int len) { uint16_t crc = 0xFFFF; for (int pos = 0; pos < len; pos++) { crc ^= (uint16_t)buf[pos]; // XOR byte into least sig. byte of crc for (int i = 8; i != 0; i--) { // Loop over each bit if ((crc & 0x0001) != 0) { // If the LSB is set crc >>= 1; // Shift right and XOR 0xA001 crc ^= 0xA001; } else // Else LSB is not set crc >>= 1; // Just shift right } } // Note, this number has low and high bytes swapped, so use it accordingly (or swap bytes) return crc; } / USER CODE END PFP / / Private user code ---------------------------------------------------------/ / USER CODE BEGIN 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_DMA_Init(); MX_USART1_UART_Init(); / USER CODE BEGIN 2 / HAL_UART_Receive_DMA(&huart1, Modbus_Rtucevap, 9); Modbus_Rtu[0]=1; Modbus_Rtu[1]=3; Modbus_Rtu[2]=0; Modbus_Rtu[3]=0; Modbus_Rtu[4]=1; Modbus_Rtu[5]=5; //for voltage query / USER CODE END 2 / / Infinite loop / / USER CODE BEGIN WHILE / while (1) { / USER CODE END WHILE / / USER CODE BEGIN 3 / HAL_GPIO_WritePin(GPIOD, GPIO_PIN_11, GPIO_PIN_SET); CRC_Control= ModRtu_CRC(Modbus_Rtu,6); Modbus_Rtu[6]= CRC_Control & 0xff; Modbus_Rtu[7]= (CRC_Control>>8) & 0xff; HAL_UART_Transmit(&huart1, Modbus_Rtu, 8, 100); HAL_Delay(1000); HAL_GPIO_WritePin(GPIOD, GPIO_PIN_11, GPIO_PIN_RESET); HAL_Delay(1000); } / USER CODE END 3 / } /* * @brief System Clock Configuration * @retval None / void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /* Configure the main internal regulator output voltage / __HAL_RCC_PWR_CLK_ENABLE(); __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); /* 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.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLM = 4; RCC_OscInitStruct.PLL.PLLN = 84; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 7; 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_DIV2; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) { Error_Handler(); } } /* * @brief USART1 Initialization Function * @param None * @retval None / static void MX_USART1_UART_Init(void) { / USER CODE BEGIN USART1_Init 0 / / USER CODE END USART1_Init 0 / / USER CODE BEGIN USART1_Init 1 / / USER CODE END USART1_Init 1 / huart1.Instance = USART1; huart1.Init.BaudRate = 9200; huart1.Init.WordLength = UART_WORDLENGTH_8B; huart1.Init.StopBits = UART_STOPBITS_1; huart1.Init.Parity = UART_PARITY_NONE; huart1.Init.Mode = UART_MODE_TX_RX; huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart1.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart1) != HAL_OK) { Error_Handler(); } / USER CODE BEGIN USART1_Init 2 / / USER CODE END USART1_Init 2 / } /* * Enable DMA controller clock / static void MX_DMA_Init(void) { / DMA controller clock enable / __HAL_RCC_DMA2_CLK_ENABLE(); / DMA interrupt init / / DMA2_Stream2_IRQn interrupt configuration / HAL_NVIC_SetPriority(DMA2_Stream2_IRQn, 0, 0); HAL_NVIC_EnableIRQ(DMA2_Stream2_IRQn); } /* * @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_GPIOH_CLK_ENABLE(); __HAL_RCC_GPIOD_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); /Configure GPIO pin Output Level / HAL_GPIO_WritePin(GPIOD, GPIO_PIN_11, GPIO_PIN_RESET); /Configure GPIO pin : PD11 / GPIO_InitStruct.Pin = GPIO_PIN_11; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOD, &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 / /********************* (C) COPYRIGHT STMicroelectronics *END OF FILE**/ 0
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答案对人有帮助，有参考价值 0 再检查一遍。我在 MX STM32F407 UART 设置中没有看到任何 RS485 DE 选项。它有RS232 RTS，但没有RS485 DE，它们有很大的不同！我们尝试了 STM32F413，它和您的 STM32F407 一样是 F4 系列，但它没有真正的 RS485，导致痛苦。我们现在使用的是具有真正 RS485 DE 的 L4 系列，特别是 STM32L496（如果使用 JTAG，请注意不要使用 NJTRST 引脚）。如果您打算继续使用 STM32F407 Discovery，则必须找到实现软件 RS485 DE 信号的代码。由于 UART 发送中断的延迟导致 DE 时序不佳，我们遇到了问题。祝你好运，我不会浪费太多时间，最好是通过正确的 RS485 实现来获得 IC。

2023-1-6 13:45:09 评论举报程家文