通过STM32cubeMX将STM32F767+LAN8720+LwIP+FreeRTOS的以太网实现
本文使用了正点原子的阿波罗开发板，接下来我将粗略的对STM32F767通过STM32cubeMX进行以太网协议配置。
具体步骤
1.首先使能ETH，模式选择RMII；
2.使能LWIP和FREERTOS；
因为阿波罗的开发板PHY芯片的ETH_DXT1和ETH_DXT0用的是PG13，PG14引脚，和默认的不同，所以这里改一下
3.配置时钟，在这里我放上我自己的时钟配置图，只要不标红就行，我用的是25MHz外部晶振作时钟源 ；
4.配置ETH，由于阿波罗开发板的LAN8720芯片的PHYAD0引脚悬空，故PHY Address设置为0；
5.由于我用的STM32cubeMX的版本是将LAN8742A作为默认芯片，所以我们这里不做修改，只用将内部参数改为LAN8720参数即可；
6.配置LWIP，本人这里不使用DHCP获取IP地址等信息，并且我使用的是TCP，所以未对UDP使能，设置如图；
7.配置FREERTOS，我在这里加了两个线程备用
8.按下生成按钮，生成项目，生成时需要选择编译软件为自己用的软件，本人使用的是V5；
由于阿波罗开发板的PHY芯片的RESET引脚是依靠PCF8574的P7位控制，所以我们要在项目中引入PCF8574的代码，以下代码可以在阿波罗资料盘中找到
打开main.c里的加上#include “pcf8574.h”，并在初始化部分将PCF8574初始化
/* Includes ------------------------------------------------------------------*/#include "main.h"#include "stm32f7xx_hal.h"#include "cmsis_os.h"#include "lwip.h"#include "gpio.h"/* USER CODE BEGIN Includes */#include "pcf8574.h"/* USER CODE END Includes *//* Private variables ---------------------------------------------------------*//* USER CODE BEGIN PV *//* Private variables ---------------------------------------------------------*//* USER CODE END PV *//* Private function prototypes -----------------------------------------------*/void SystemClock_Config(void);void MX_FREERTOS_Init(void);/* USER CODE BEGIN PFP *//* Private function prototypes -----------------------------------------------*//* USER CODE END PFP *//* USER CODE BEGIN 0 *//* USER CODE END 0 *//*** @brief The application entry point.** @retval None*/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 */PCF8574_Init();/* USER CODE END SysInit *//* Initialize all configured peripherals */MX_GPIO_Init();/* USER CODE BEGIN 2 *//* USER CODE END 2 *//* Call init function for freertos objects (in freertos.c) */MX_FREERTOS_Init();/* Start scheduler */osKernelStart();/* We should never get here as control is now taken by the scheduler *//* Infinite loop *//* USER CODE BEGIN WHILE */while (1){/* USER CODE END WHILE *//* USER CODE BEGIN 3 */}/* USER CODE END 3 */}
打开freertos.c里的加上
#include “gpio.h”
#include “sys.h”
#include “pcf8574.h”
#include “tcp_echoserver.h”，并在主线程将PCF8574初的P7管脚使能
PCF8574_WriteBit(ETH_RESET_IO,0);代码如下
/* Includes ------------------------------------------------------------------*/#include "FreeRTOS.h"#include "task.h"#include "main.h"#include "cmsis_os.h"/* Private includes ----------------------------------------------------------*//* USER CODE BEGIN Includes */#include "gpio.h"#include "sys.h"#include "pcf8574.h"#include "tcp_echoserver.h"/* 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 ---------------------------------------------------------*//* USER CODE BEGIN Variables *//* USER CODE END Variables */osThreadId defaultTaskHandle;osThreadId myTaskLEDHandle;osThreadId myTaskTCPHandle;/* Private function prototypes -----------------------------------------------*//* USER CODE BEGIN FunctionPrototypes */extern void tcp_echoserver_init(void);/* USER CODE END FunctionPrototypes */void StartDefaultTask(void const * argument);void LEDTask(void const * argument);void TCPTask(void const * argument);extern void MX_LWIP_Init(void);void MX_FREERTOS_Init(void); /* (MISRA C rule 8.1) *//*** @brief FreeRTOS initialization* @param None* @retval None*/void MX_FREERTOS_Init(void) {/* USER CODE BEGIN Init *//* USER CODE END Init *//* USER CODE BEGIN RTOS_MUTEX *//* add mutexes, ... *//* USER CODE END RTOS_MUTEX *//* USER CODE BEGIN RTOS_SEMAPHORES *//* add semaphores, ... *//* USER CODE END RTOS_SEMAPHORES *//* USER CODE BEGIN RTOS_TIMERS *//* start timers, add new ones, ... *//* USER CODE END RTOS_TIMERS *//* Create the thread(s) *//* definition and creation of defaultTask */osThreadDef(defaultTask, StartDefaultTask, osPriorityNormal, 0, 128);defaultTaskHandle = osThreadCreate(osThread(defaultTask), NULL);/* definition and creation of myTaskLED */osThreadDef(myTaskLED, LEDTask, osPriorityIdle, 0, 128);myTaskLEDHandle = osThreadCreate(osThread(myTaskLED), NULL);/* definition and creation of myTaskTCP */osThreadDef(myTaskTCP, TCPTask, osPriorityIdle, 0, 1024);myTaskTCPHandle = osThreadCreate(osThread(myTaskTCP), NULL);/* USER CODE BEGIN RTOS_THREADS *//* add threads, ... *//* USER CODE END RTOS_THREADS *//* USER CODE BEGIN RTOS_QUEUES *//* add queues, ... *//* USER CODE END RTOS_QUEUES */}/* USER CODE BEGIN Header_StartDefaultTask *//*** @brief Function implementing the defaultTask thread.* @param argument: Not used * @retval None*//* USER CODE END Header_StartDefaultTask */void StartDefaultTask(void const * argument){/* init code for LWIP */MX_LWIP_Init();/* USER CODE BEGIN StartDefaultTask */PCF8574_WriteBit(ETH_RESET_IO,0); //Æô¶¯PHYоƬTcp_Server_Init();/* Infinite loop */for(;;){osDelay(1);}/* USER CODE END StartDefaultTask */}/* USER CODE BEGIN Header_LEDTask *//*** @brief Function implementing the myTaskLED thread.* @param argument: Not used* @retval None*//* USER CODE END Header_LEDTask */void LEDTask(void const * argument){/* USER CODE BEGIN LEDTask *//* Infinite loop */for(;;){osDelay(1); }/* USER CODE END LEDTask */}/* USER CODE BEGIN Header_TCPTask *//*** @brief Function implementing the myTaskTCP thread.* @param argument: Not used* @retval None*//* USER CODE END Header_TCPTask */void TCPTask(void const * argument){/* USER CODE BEGIN TCPTask *//* Infinite loop */for(;;){osDelay(1); }/* USER CODE END TCPTask */}
接下来我们的开发板连上电脑，保证电脑IP地址和开发板IP地址在同一网段后按Windows+R后输入cmd回车打开CMD，在界面输入ping xxx.xxx.xxx.xxx(xxx代表开发板IP地址)，可以得到
这样开发板就ping通了，这个时候就可以引入服务器或是客户端的代码，实现对应功能。
源码以上上传Gitee，链接放在旁边，点赞打赏走一走
ModbusTCP代码
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