串列埠 usart 完整幀 協議 解析
阿新 • • 發佈:2022-05-29
參考:https://blog.csdn.net/qq_40932099/article/details/118423684
串列埠 usart 完整幀 協議 解析
在進行串列埠通訊時,有些私有協議,有長短不一致。
在接收到幀後,進行分析。
在接收幀時的幀時,什麼時候進中斷,怎麼才能算接收完,完整的一幀資料。
HAL_UARTEx_ReceiveToIdle_IT(&huart2, (uint8_t*) myData, mySize);
這個函式不會讓你失望!!!stm32f7xx_hal_uart_ex.c 中。
具體用法:
1. 呼叫 HAL_UARTEx_ReceiveToIdle_IT(&huart2, (uint8_t*) myData, mySize); 即,開啟空閒接收中斷。
2.接收完會,自動呼叫它的回撥函式,void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size) ;弱函式需要自己實現。
3.一般的不佔時間的處理,在回撥函式中就處理了。如果佔時間,建議使用訊息佇列將資料發出,在對應的任務中進行處理。
main.c
/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * <h2><center>© Copyright (c) 2022 STMicroelectronics. * All rights reserved.</center></h2> * * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */ /* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" #include "stm32f7xx_hal_uart.h" #include "stm32f7xx_hal_usart.h" #include "stm32f7xx_hal_uart_ex.h" #include "stm32f7xx_hal_usart_ex.h" #include "string.h" #include "strings.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 ---------------------------------------------------------*/ UART_HandleTypeDef huart2; /* USER CODE BEGIN PV */ uint8_t BUFFER_MAX_SIZE = 64; uint8_t myData[BUFFER_MAX_SIZE]; uint8_t outData[BUFFER_MAX_SIZE]; uint8_t mySize = 64; uint8_t buff[] = "Heelloo\r\n"; uint8_t errorFrame[] = "ErrorFrame\r\n"; /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_USART2_UART_Init(void); /* USER CODE BEGIN PFP */ /* 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 */ /* Enable I-Cache---------------------------------------------------------*/ SCB_EnableICache(); /* Enable D-Cache---------------------------------------------------------*/ SCB_EnableDCache(); /* 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_USART2_UART_Init(); /* USER CODE BEGIN 2 */ HAL_UARTEx_ReceiveToIdle_IT(&huart2, (uint8_t*) myData, mySize); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ HAL_UART_Transmit(&huart2, buff, sizeof(buff), 1000); //傳送接收到的資料 HAL_Delay(3000); /* 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 }; RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = { 0 }; /** Configure LSE Drive Capability */ HAL_PWR_EnableBkUpAccess(); /** 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 = 25; RCC_OscInitStruct.PLL.PLLN = 432; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 2; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /** Activate the Over-Drive mode */ if (HAL_PWREx_EnableOverDrive() != 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_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK) { Error_Handler(); } PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USART2; PeriphClkInitStruct.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1; if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK) { Error_Handler(); } } /** * @brief USART2 Initialization Function * @param None * @retval None */ static void MX_USART2_UART_Init(void) { /* USER CODE BEGIN USART2_Init 0 */ /* USER CODE END USART2_Init 0 */ /* USER CODE BEGIN USART2_Init 1 */ /* USER CODE END USART2_Init 1 */ huart2.Instance = USART2; huart2.Init.BaudRate = 115200; huart2.Init.WordLength = UART_WORDLENGTH_8B; huart2.Init.StopBits = UART_STOPBITS_1; huart2.Init.Parity = UART_PARITY_NONE; huart2.Init.Mode = UART_MODE_TX_RX; huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart2.Init.OverSampling = UART_OVERSAMPLING_16; huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE; huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT; if (HAL_UART_Init(&huart2) != HAL_OK) { Error_Handler(); } /* USER CODE BEGIN USART2_Init 2 */ /* USER CODE END USART2_Init 2 */ } /** * @brief GPIO Initialization Function * @param None * @retval None */ static void MX_GPIO_Init(void) { /* GPIO Ports Clock Enable */ __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOH_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); } /* USER CODE BEGIN 4 */ void ReceiveProcessTYPTE(uint8_t *rData, uint16_t Size) { switch (rData[8]) { case 0x5A: break; case 0x5C: HAL_UART_Transmit(&huart2, rData, Size, 1000); break; case 0xA5: break; case 0x91: break; case 0x81: break; case 0x82: break; default: break; } } void ReceiveProcessCMD(uint8_t *rData, uint16_t Size) { uint8_t DEVICE_ID = rData[3]; //感測器型別 0x22 uint8_t CMD = rData[7]; //幀命令 0x5C uint8_t TYPE = rData[8]; //幀型別 0x03 } void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size) { UNUSED(huart); UNUSED(Size); if (huart->Instance == USART2) { if (myData[0] == 0xAA && myData[1] == 0x55 && myData[2] == 0x7F) { ReceiveProcessCMD(myData, BUFFER_MAX_SIZE); //使用函式處理,推薦採用訊息佇列 } else { HAL_UART_Transmit(&huart2, errorFrame, sizeof(errorFrame), 1000); } memset(myData, 0, sizeof(myData)); HAL_UARTEx_ReceiveToIdle_IT(&huart2, (uint8_t*) myData, mySize); } } /* 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\r\n", file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/