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 2004 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¶¯PHYоƬ
Tcp_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。