else if(uartHandle->Instance==USART2) { /* USER CODE BEGIN USART2_MspInit 0 */ /* USER CODE END USART2_MspInit 0 */ /* USART2 clock enable */ __HAL_RCC_USART2_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); /**USART2 GPIO Configuration PA2 ------> USART2_TX PA3 ------> USART2_RX */ GPIO_InitStruct.Pin = GPIO_PIN_2; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); GPIO_InitStruct.Pin = GPIO_PIN_3; GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); /* USART2 interrupt Init */ HAL_NVIC_SetPriority(USART2_IRQn, 0, 0); HAL_NVIC_EnableIRQ(USART2_IRQn); /* USER CODE BEGIN USART2_MspInit 1 */ /* USER CODE END USART2_MspInit 1 */ } }

这段代码是 USART2 的 MSP（MCU Support Package）初始化函数，用于初始化 USART2 的时钟、GPIO 引脚和中断。在该函数中，同样使用了判断句柄所对应的 USART 实例是否为 USART2 的方法。

在该函数中，使用了 `__HAL_RCC_USART2_CLK_ENABLE()` 函数启用了 USART2 的时钟，并使用 `__HAL_RCC_GPIOA_CLK_ENABLE()` 函数启用了 GPIOA 的时钟。然后，通过 `GPIO_InitStruct` 结构体对 GPIO 引脚进行了配置，设置了 PA2 引脚为复用推挽输出模式，用于 USART2 的 TX 引脚；设置了 PA3 引脚为输入模式，用于 USART2 的 RX 引脚。接下来，使用 `HAL_GPIO_Init()` 函数初始化 GPIO 引脚。

最后，使用 `HAL_NVIC_SetPriority()` 函数设置 USART2 中断的优先级为最高，并使用 `HAL_NVIC_EnableIRQ()` 函数使能 USART2 中断。

相关问题

stm32f7777 以太网代码

以下是基于STM32F7777的以太网代码示例：

#include "stm32f7xx_hal.h"
#include "stm32746g_discovery.h"
#include "lwip/opt.h"
#include "lwip/init.h"
#include "lwip/netif.h"
#include "lwip/timeouts.h"
#include "netif/etharp.h"
#include "ethernetif.h"

/* Private variables ---------------------------------------------------------*/
ETH_HandleTypeDef heth;
ETH_TxPacketConfig TxConfig;

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_ETH_Init(void);

/* Private functions ---------------------------------------------------------*/

int main(void)
{
  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* Configure the system clock */
  SystemClock_Config();

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_ETH_Init();

  /* Initilialize the LwIP stack */
  lwip_init();

  /* Add the network interface (IPv4/IPv6) with default settings */
  netif_add(&gnetif, NULL, NULL, NULL, NULL, &ethernetif_init, &ethernet_input);

  /* Registers the default network interface */
  netif_set_default(&gnetif);

  /* When the netif is fully configured this function must be called */
  netif_set_up(&gnetif);

  /* Infinite loop */
  for (;;)
  {
    /* Handle LwIP timeouts */
    sys_check_timeouts();

    /* Poll for received packets and process them */
    ethernetif_input(&gnetif);
  }
}

/**
  * @brief ETH Initialization Function
  * @param None
  * @retval None
  */
static void MX_ETH_Init(void)
{
  /* USER CODE BEGIN ETH_Init 0 */

  /* USER CODE END ETH_Init 0 */
  /* USER CODE BEGIN ETH_Init 1 */

  /* USER CODE END ETH_Init 1 */
  heth.Instance = ETH;
  heth.Init.AutoNegotiation = ETH_AUTONEGOTIATION_ENABLE;
  heth.Init.PhyAddress = LAN8742A_PHY_ADDRESS;
  heth.Init.MACAddr[0] =   0x00;
  heth.Init.MACAddr[1] =   0x80;
  heth.Init.MACAddr[2] =   0xE1;
  heth.Init.MACAddr[3] =   0x00;
  heth.Init.MACAddr[4] =   0x00;
  heth.Init.MACAddr[5] =   0x00;
  heth.Init.RxMode = ETH_RXINTERRUPT_MODE;
  heth.Init.ChecksumMode = ETH_CHECKSUM_BY_HARDWARE;
  heth.Init.MediaInterface = ETH_MEDIA_INTERFACE_RMII;

  /* USER CODE BEGIN MACADDRESS */

  /* USER CODE END MACADDRESS */

  if (HAL_ETH_Init(&heth) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN ETH_Init 2 */

  /* USER CODE END ETH_Init 2 */
}

/**
  * @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.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 25;
  RCC_OscInitStruct.PLL.PLLN = 400;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 8;
  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_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_6) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOJ_CLK_ENABLE();
}

/* Relevant functions for Ethernet driver */

void HAL_ETH_MspInit(ETH_HandleTypeDef* ethHandle)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(ethHandle->Instance==ETH)
  {
    /* USER CODE BEGIN ETH_MspInit 0 */

    /* USER CODE END ETH_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_ETH_CLK_ENABLE();

    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOG_CLK_ENABLE();
    /**ETH GPIO Configuration
    PA1     ------> ETH_REF_CLK
    PA2     ------> ETH_MDIO
    PA7     ------> ETH_CRS_DV
    PC1     ------> ETH_MDC
    PC4     ------> ETH_RXD0
    PC5     ------> ETH_RXD1
    PG11     ------> ETH_TX_EN
    PG13     ------> ETH_TXD0
    PG14     ------> ETH_TXD1
    */
    GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_4|GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_13|GPIO_PIN_14;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
    HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);

    /* USER CODE BEGIN ETH_MspInit 1 */

    /* USER CODE END ETH_MspInit 1 */
  }
}

void HAL_ETH_MspDeInit(ETH_HandleTypeDef* ethHandle)
{
  if(ethHandle->Instance==ETH)
  {
    /* USER CODE BEGIN ETH_MspDeInit 0 */

    /* USER CODE END ETH_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_ETH_CLK_DISABLE();

    /**ETH GPIO Configuration
    PA1     ------> ETH_REF_CLK
    PA2     ------> ETH_MDIO
    PA7     ------> ETH_CRS_DV
    PC1     ------> ETH_MDC
    PC4     ------> ETH_RXD0
    PC5     ------> ETH_RXD1
    PG11     ------> ETH_TX_EN
    PG13     ------> ETH_TXD0
    PG14     ------> ETH_TXD1
    */
    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_7);

    HAL_GPIO_DeInit(GPIOC, GPIO_PIN_1|GPIO_PIN_4|GPIO_PIN_5);

    HAL_GPIO_DeInit(GPIOG, GPIO_PIN_11|GPIO_PIN_13|GPIO_PIN_14);

    /* USER CODE BEGIN ETH_MspDeInit 1 */

    /* USER CODE END ETH_MspDeInit 1 */
  }
}

/**
  * @brief  Retargets the C library printf function to the USART.
  * @param  None
  * @retval None
  */
PUTCHAR_PROTOTYPE
{
  /* Place your implementation of fputc here */
  /* e.g. write a character to the USART */
  HAL_UART_Transmit(&huart3, (uint8_t *)&ch, 1, HAL_MAX_DELAY);

  return ch;
}

/* Relevant functions for LwIP stack */

void ethernetif_input(struct netif *netif)
{
  err_t err;
  struct pbuf *p;

  /* move received packet into a new pbuf */
  err = ethernetif_recv(netif, &p);

  /* if no error occured, send packet */
  if (err == ERR_OK)
  {
    /* pass all packets to upper layer */
    netif->input(p, netif);
  }
  else
  {
    /* Free buffer */
    pbuf_free(p);
  }
}

/* Relevant functions for LwIP stack */

void HAL_ETH_RxCpltCallback(ETH_HandleTypeDef *heth)
{
  /* Frame received */
  ethernetif_input(&gnetif);

  /* Clear the Eth DMA Rx IT pending bits */
  __HAL_ETH_DMA_CLEAR_IT(heth, ETH_DMA_IT_R);

  /* Resume DMA reception */
  HAL_ETH_Receive_IT(heth);
}

/* Relevant functions for LwIP stack */

void HAL_ETH_TxCpltCallback(ETH_HandleTypeDef *heth)
{
  /* Clear the Eth DMA Tx IT pending bits */
  __HAL_ETH_DMA_CLEAR_IT(heth, ETH_DMA_IT_T);

  /* Process Unlocked */
  osSemaphoreRelease(s_xSemaphore);
}

/* Relevant functions for LwIP stack */

void HAL_ETH_ErrorCallback(ETH_HandleTypeDef *heth)
{
  /* Stop the transmission process */
  HAL_ETH_TransmitStop(&heth);

  /* Flush Transmit FIFO */
  HAL_ETH_FlushTransmitFIFO(&heth);

  /* Resume DMA reception */
  HAL_ETH_Receive_IT(&heth);
}

/* Relevant functions for LwIP stack */

void HAL_ETH_MspInit(ETH_HandleTypeDef* ethHandle)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(ethHandle->Instance==ETH)
  {
    /* USER CODE BEGIN ETH_MspInit 0 */

    /* USER CODE END ETH_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_ETH_CLK_ENABLE();

    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOG_CLK_ENABLE();
    /**ETH GPIO Configuration
    PA1     ------> ETH_REF_CLK
    PA2     ------> ETH_MDIO
    PA7     ------> ETH_CRS_DV
    PC1     ------> ETH_MDC
    PC4     ------> ETH_RXD0
    PC5     ------> ETH_RXD1
    PG11     ------> ETH_TX_EN
    PG13     ------> ETH_TXD0
    PG14     ------> ETH_TXD1
    */
    GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_1|GPIO_PIN_4|GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_13|GPIO_PIN_14;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF11_ETH;
    HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);

    /* USER CODE BEGIN ETH_MspInit 1 */

    /* USER CODE END ETH_MspInit 1 */
  }
}

/* Relevant functions for LwIP stack */

void HAL_ETH_MspDeInit(ETH_HandleTypeDef* ethHandle)
{
  if(ethHandle->Instance==ETH)
  {
    /* USER CODE BEGIN ETH_MspDeInit 0 */

    /* USER CODE END ETH_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_ETH_CLK_DISABLE();

    /**ETH GPIO Configuration
    PA1     ------> ETH_REF_CLK
    PA2     ------> ETH_MDIO
    PA7     ------> ETH_CRS_DV
    PC1     ------> ETH_MDC
    PC4     ------> ETH_RXD0
    PC5     ------> ETH_RXD1
    PG11     ------> ETH_TX_EN
    PG13     ------> ETH_TXD0
    PG14     ------> ETH_TXD1
    */
    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_7);

    HAL_GPIO_DeInit(GPIOC, GPIO_PIN_1|GPIO_PIN_4|GPIO_PIN_5);

    HAL_GPIO_DeInit(GPIOG, GPIO_PIN_11|GPIO_PIN_13|GPIO_PIN_14);

    /* USER CODE BEGIN ETH_MspDeInit 1 */

    /* USER CODE END ETH_MspDeInit 1 */
  }
}

/* Relevant functions for LwIP stack */

void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
  /* Handle timeouts */
  sys_check_timeouts();
}

/* Relevant functions for LwIP stack */

void Error_Handler(void)
{
  /* User can add his own implementation to report the HAL error return state */
  while(1)
  {
  }
}

/* Relevant functions for LwIP stack */

void assert_failed(uint8_t* file, uint32_t line)
{
  /* 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) */

  /* Infinite loop */
  while (1)
  {
  }
}

写一个stm32 对应的上位机

好的，我可以为您提供一个简单的STM32与上位机通信的示例程序。

首先，您需要选择一种上位机通信方式，常见的有串口通信、USB通信和以太网通信等。这里我以串口通信为例。

1. 首先，在STM32中配置串口通信，设置波特率、数据位、校验位、停止位等参数，并开启串口中断。以下是一个简单的配置示例：

#include "stm32f1xx_hal.h"

UART_HandleTypeDef huart1;

void MX_USART1_UART_Init(void)
{
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  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();
  }
}

void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(uartHandle->Instance==USART1)
  {
    /* USART1 clock enable */
    __HAL_RCC_USART1_CLK_ENABLE();
  
    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**USART1 GPIO Configuration    
    PA9     ------> USART1_TX
    PA10     ------> USART1_RX 
    */
    GPIO_InitStruct.Pin = GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_10;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* USART1 interrupt Init */
    HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(USART1_IRQn);
  }
}

void USART1_IRQHandler(void)
{
  /* USER CODE BEGIN USART1_IRQn 0 */

  /* USER CODE END USART1_IRQn 0 */
  HAL_UART_IRQHandler(&huart1);
  /* USER CODE BEGIN USART1_IRQn 1 */

  /* USER CODE END USART1_IRQn 1 */
}

2. 在STM32中编写中断服务程序，处理接收到的数据。以下是一个简单的中断服务程序示例，将接收到的数据存储在一个全局数组中：

uint8_t rx_buffer[20];
uint8_t rx_count = 0;

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
    if (huart->Instance == USART1)
    {
        if (rx_count < 20)
        {
            rx_buffer[rx_count++] = huart->Instance->DR;
        }
        else
        {
            rx_count = 0;
        }
        HAL_UART_Receive_IT(&huart1, &rx_byte, 1);
    }
}

3. 在上位机中编写相应的串口通信程序，与STM32进行通信。以下是一个简单的Python程序示例，使用PySerial库与STM32进行通信：

import serial

ser = serial.Serial('COM1', 115200, timeout=1)

while True:
    data = ser.readline()
    if data:
        print(data.decode('utf-8'))

以上是一个简单的STM32与上位机串口通信的示例程序，您可以根据自己的需求进行修改和优化。