[嵌入式]【STM32】HAL库-以太网外设-LAN8720A-LWIP-无操作系统

开发环境

• KEIL:MDK_ARM_5.27
• MCU:STM32F429IGT6
• PHY_IC:LAN8720A
• LWIP:LWIP2.1.2
• STM32CUBEMX:6.6.1
• HAL:V1.27.1

LAN8720A使用RMII接口与STM32的ETH外设进行数据通信
STM32使用SMI接口读/写LAN8720A的寄存器

硬件原理图

LAN8720A由外部25MHz晶振提供时钟，LED2/NINTSEL引脚配置为下拉，故PHY（LAN8720A）提供50MHz时钟给RMII的NINT/REFCLKO（此时引脚NINT/REFCLKO仅作为时钟输出，中断功能不可用），RMII需要50MHz时钟

LED1/REGOFF配置为下拉，使用LAN8720A内部稳压器

上电后MODE引脚的电平会被锁存，用于设置PHY的工作模式，后续也可以写寄存器来修改HPY工作模式，也可以设置PHY为自适应模式，自动适配最佳模式，然后通过读寄存器来获取PHY的工作模式，无非就是速率与双工。

上电复位后，RXER/PHYAD0，引脚的电平被锁存在一个内部寄存器中；
可以使用硬件配置将设备的 SMI 地址配置为值 0 或 1，不接的话认为为0。

CUBEMX配置

基本的时钟、调试下载、Systick 不过多介绍

PHY引脚配置

设置MAC地址、接收缓冲区的大小、数据接收模式

设置PHY的类型为LAN8742A

（最好根据LAN8742A来设置自己使用的PHY，否则CUBEMX不会生成void HAL_ETH_MspInit(ETH_HandleTypeDef* ethHandle)GPIO、DMA、NVIC等初始化函数）


这些生成的宏均在路径Core\Inc\stm32f4xx_hal_conf.h下，大家可以去看看

生成的void HAL_ETH_MspInit(ETH_HandleTypeDef* ethHandle)在工程文件夹LWIP\Target\ethernetif.c下
在生成的HAL_ETH_MspInit()函数中添加PHY上电复位代码（其实也可以不用添加，HAL库生成会通过写BCR寄存器RESET位来实现软件复位，然后读取RESET位来确认是否PHY已经复位完毕）

HAL库生成的HAL_ETH_MspInit()如下：

/**
  * @brief  Initializes the ETH MSP.
  * @param  ethHandle: ETH handle
  * @retval None
  */

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 */
    /* Enable Peripheral clock */
    __HAL_RCC_ETH_CLK_ENABLE();

    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();
    __HAL_RCC_GPIOG_CLK_ENABLE();
    /**ETH GPIO Configuration
    PC1     ------> ETH_MDC
    PA1     ------> ETH_REF_CLK
    PA2     ------> ETH_MDIO
    PA7     ------> ETH_CRS_DV
    PC4     ------> ETH_RXD0
    PC5     ------> ETH_RXD1
    PB11     ------> ETH_TX_EN
    PG13     ------> ETH_TXD0
    PG14     ------> ETH_TXD1
    */
    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_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_11;
    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(GPIOB, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = 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 */

    /* 手动添加 PHY 需要的复位延时代码 */
    HAL_GPIO_WritePin(LAN8720A_RESET_GPIO_Port, LAN8720A_RESET_Pin, GPIO_PIN_RESET);
    HAL_Delay(60);
    HAL_GPIO_WritePin(LAN8720A_RESET_GPIO_Port, LAN8720A_RESET_Pin, GPIO_PIN_SET);
    HAL_Delay(60);

  /* 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
    PC1     ------> ETH_MDC
    PA1     ------> ETH_REF_CLK
    PA2     ------> ETH_MDIO
    PA7     ------> ETH_CRS_DV
    PC4     ------> ETH_RXD0
    PC5     ------> ETH_RXD1
    PB11     ------> ETH_TX_EN
    PG13     ------> ETH_TXD0
    PG14     ------> ETH_TXD1
    */
    HAL_GPIO_DeInit(GPIOC, GPIO_PIN_1|GPIO_PIN_4|GPIO_PIN_5);

    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_7);

    HAL_GPIO_DeInit(GPIOB, GPIO_PIN_11);

    HAL_GPIO_DeInit(GPIOG, GPIO_PIN_13|GPIO_PIN_14);

  /* USER CODE BEGIN ETH_MspDeInit 1 */

  /* USER CODE END ETH_MspDeInit 1 */
  }
}

设置PHY寄存器及相应掩码

打开 Drivers\BSP\Components\lan8742\lan8742.h 对照LAN8720A的BCR寄存器修改相应位的掩码

/**
  ******************************************************************************
  * @file    lan8742.h
  * @author  MCD Application Team
  * @brief   This file contains all the functions prototypes for the
  *          lan8742.c PHY driver.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2017 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
  *
  ******************************************************************************
  */ 

/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef LAN8742_H
#define LAN8742_H

#ifdef __cplusplus
 extern "C" {
#endif   
   
/* Includes ------------------------------------------------------------------*/
#include <stdint.h>

/** @addtogroup BSP
  * @{
  */ 

/** @addtogroup Component
  * @{
  */
    
/** @defgroup LAN8742
  * @{
  */    
/* Exported constants --------------------------------------------------------*/
/** @defgroup LAN8742_Exported_Constants LAN8742 Exported Constants
  * @{
  */ 
  
/** @defgroup LAN8742_Registers_Mapping LAN8742 Registers Mapping
  * @{
  */ 
#define LAN8742_BCR      ((uint16_t)0x0000U)
#define LAN8742_BSR      ((uint16_t)0x0001U)
#define LAN8742_PHYI1R   ((uint16_t)0x0002U)
#define LAN8742_PHYI2R   ((uint16_t)0x0003U)
#define LAN8742_ANAR     ((uint16_t)0x0004U)
#define LAN8742_ANLPAR   ((uint16_t)0x0005U)
#define LAN8742_ANER     ((uint16_t)0x0006U)
#define LAN8742_ANNPTR   ((uint16_t)0x0007U)
#define LAN8742_ANNPRR   ((uint16_t)0x0008U)
#define LAN8742_MMDACR   ((uint16_t)0x000DU)
#define LAN8742_MMDAADR  ((uint16_t)0x000EU)
#define LAN8742_ENCTR    ((uint16_t)0x0010U)
#define LAN8742_MCSR     ((uint16_t)0x0011U)
#define LAN8742_SMR      ((uint16_t)0x0012U)
#define LAN8742_TPDCR    ((uint16_t)0x0018U)
#define LAN8742_TCSR     ((uint16_t)0x0019U)
#define LAN8742_SECR     ((uint16_t)0x001AU)
#define LAN8742_SCSIR    ((uint16_t)0x001BU)
#define LAN8742_CLR      ((uint16_t)0x001CU)
#define LAN8742_ISFR     ((uint16_t)0x001DU)
#define LAN8742_IMR      ((uint16_t)0x001EU)
#define LAN8742_PHYSCSR  ((uint16_t)0x001FU)
/**
  * @}
  */

/** @defgroup LAN8742_BCR_Bit_Definition LAN8742 BCR Bit Definition
  * @{
  */    
#define LAN8742_BCR_SOFT_RESET         ((uint16_t)0x8000U)
#define LAN8742_BCR_LOOPBACK           ((uint16_t)0x4000U)
#define LAN8742_BCR_SPEED_SELECT       ((uint16_t)0x2000U)
#define LAN8742_BCR_AUTONEGO_EN        ((uint16_t)0x1000U)
#define LAN8742_BCR_POWER_DOWN         ((uint16_t)0x0800U)
#define LAN8742_BCR_ISOLATE            ((uint16_t)0x0400U)
#define LAN8742_BCR_RESTART_AUTONEGO   ((uint16_t)0x0200U)
#define LAN8742_BCR_DUPLEX_MODE        ((uint16_t)0x0100U) 
/**
  * @}
  */

/** @defgroup LAN8742_BSR_Bit_Definition LAN8742 BSR Bit Definition
  * @{
  */   
#define LAN8742_BSR_100BASE_T4       ((uint16_t)0x8000U)
#define LAN8742_BSR_100BASE_TX_FD    ((uint16_t)0x4000U)
#define LAN8742_BSR_100BASE_TX_HD    ((uint16_t)0x2000U)
#define LAN8742_BSR_10BASE_T_FD      ((uint16_t)0x1000U)
#define LAN8742_BSR_10BASE_T_HD      ((uint16_t)0x0800U)
#define LAN8742_BSR_100BASE_T2_FD    ((uint16_t)0x0400U)
#define LAN8742_BSR_100BASE_T2_HD    ((uint16_t)0x0200U)
#define LAN8742_BSR_EXTENDED_STATUS  ((uint16_t)0x0100U)
#define LAN8742_BSR_AUTONEGO_CPLT    ((uint16_t)0x0020U)
#define LAN8742_BSR_REMOTE_FAULT     ((uint16_t)0x0010U)
#define LAN8742_BSR_AUTONEGO_ABILITY ((uint16_t)0x0008U)
#define LAN8742_BSR_LINK_STATUS      ((uint16_t)0x0004U)
#define LAN8742_BSR_JABBER_DETECT    ((uint16_t)0x0002U)
#define LAN8742_BSR_EXTENDED_CAP     ((uint16_t)0x0001U)
/**
  * @}
  */

/** @defgroup LAN8742_PHYI1R_Bit_Definition LAN8742 PHYI1R Bit Definition
  * @{
  */
#define LAN8742_PHYI1R_OUI_3_18           ((uint16_t)0xFFFFU)
/**
  * @}
  */

/** @defgroup LAN8742_PHYI2R_Bit_Definition LAN8742 PHYI2R Bit Definition
  * @{
  */
#define LAN8742_PHYI2R_OUI_19_24          ((uint16_t)0xFC00U)
#define LAN8742_PHYI2R_MODEL_NBR          ((uint16_t)0x03F0U)
#define LAN8742_PHYI2R_REVISION_NBR       ((uint16_t)0x000FU)
/**
  * @}
  */

/** @defgroup LAN8742_ANAR_Bit_Definition LAN8742 ANAR Bit Definition
  * @{
  */
#define LAN8742_ANAR_NEXT_PAGE               ((uint16_t)0x8000U)
#define LAN8742_ANAR_REMOTE_FAULT            ((uint16_t)0x2000U)
#define LAN8742_ANAR_PAUSE_OPERATION         ((uint16_t)0x0C00U)
#define LAN8742_ANAR_PO_NOPAUSE              ((uint16_t)0x0000U)
#define LAN8742_ANAR_PO_SYMMETRIC_PAUSE      ((uint16_t)0x0400U)
#define LAN8742_ANAR_PO_ASYMMETRIC_PAUSE     ((uint16_t)0x0800U)
#define LAN8742_ANAR_PO_ADVERTISE_SUPPORT    ((uint16_t)0x0C00U)
#define LAN8742_ANAR_100BASE_TX_FD           ((uint16_t)0x0100U)
#define LAN8742_ANAR_100BASE_TX              ((uint16_t)0x0080U)
#define LAN8742_ANAR_10BASE_T_FD             ((uint16_t)0x0040U)
#define LAN8742_ANAR_10BASE_T                ((uint16_t)0x0020U)
#define LAN8742_ANAR_SELECTOR_FIELD          ((uint16_t)0x000FU)
/**
  * @}
  */

/** @defgroup LAN8742_ANLPAR_Bit_Definition LAN8742 ANLPAR Bit Definition
  * @{
  */
#define LAN8742_ANLPAR_NEXT_PAGE            ((uint16_t)0x8000U)
#define LAN8742_ANLPAR_REMOTE_FAULT         ((uint16_t)0x2000U)
#define LAN8742_ANLPAR_PAUSE_OPERATION      ((uint16_t)0x0C00U)
#define LAN8742_ANLPAR_PO_NOPAUSE           ((uint16_t)0x0000U)
#define LAN8742_ANLPAR_PO_SYMMETRIC_PAUSE   ((uint16_t)0x0400U)
#define LAN8742_ANLPAR_PO_ASYMMETRIC_PAUSE  ((uint16_t)0x0800U)
#define LAN8742_ANLPAR_PO_ADVERTISE_SUPPORT ((uint16_t)0x0C00U)
#define LAN8742_ANLPAR_100BASE_TX_FD        ((uint16_t)0x0100U)
#define LAN8742_ANLPAR_100BASE_TX           ((uint16_t)0x0080U)
#define LAN8742_ANLPAR_10BASE_T_FD          ((uint16_t)0x0040U)
#define LAN8742_ANLPAR_10BASE_T             ((uint16_t)0x0020U)
#define LAN8742_ANLPAR_SELECTOR_FIELD       ((uint16_t)0x000FU)
/**
  * @}
  */

/** @defgroup LAN8742_ANER_Bit_Definition LAN8742 ANER Bit Definition
  * @{
  */
#define LAN8742_ANER_RX_NP_LOCATION_ABLE    ((uint16_t)0x0040U)
#define LAN8742_ANER_RX_NP_STORAGE_LOCATION ((uint16_t)0x0020U)
#define LAN8742_ANER_PARALLEL_DETECT_FAULT  ((uint16_t)0x0010U)
#define LAN8742_ANER_LP_NP_ABLE             ((uint16_t)0x0008U)
#define LAN8742_ANER_NP_ABLE                ((uint16_t)0x0004U)
#define LAN8742_ANER_PAGE_RECEIVED          ((uint16_t)0x0002U)
#define LAN8742_ANER_LP_AUTONEG_ABLE        ((uint16_t)0x0001U)
/**
  * @}
  */

/** @defgroup LAN8742_ANNPTR_Bit_Definition LAN8742 ANNPTR Bit Definition
  * @{
  */
#define LAN8742_ANNPTR_NEXT_PAGE         ((uint16_t)0x8000U)
#define LAN8742_ANNPTR_MESSAGE_PAGE      ((uint16_t)0x2000U)
#define LAN8742_ANNPTR_ACK2              ((uint16_t)0x1000U)
#define LAN8742_ANNPTR_TOGGLE            ((uint16_t)0x0800U)
#define LAN8742_ANNPTR_MESSAGGE_CODE     ((uint16_t)0x07FFU)
/**
  * @}
  */

/** @defgroup LAN8742_ANNPRR_Bit_Definition LAN8742 ANNPRR Bit Definition
  * @{
  */
#define LAN8742_ANNPTR_NEXT_PAGE         ((uint16_t)0x8000U)
#define LAN8742_ANNPRR_ACK               ((uint16_t)0x4000U)
#define LAN8742_ANNPRR_MESSAGE_PAGE      ((uint16_t)0x2000U)
#define LAN8742_ANNPRR_ACK2              ((uint16_t)0x1000U)
#define LAN8742_ANNPRR_TOGGLE            ((uint16_t)0x0800U)
#define LAN8742_ANNPRR_MESSAGGE_CODE     ((uint16_t)0x07FFU)
/**
  * @}
  */

/** @defgroup LAN8742_MMDACR_Bit_Definition LAN8742 MMDACR Bit Definition
  * @{
  */
#define LAN8742_MMDACR_MMD_FUNCTION       ((uint16_t)0xC000U) 
#define LAN8742_MMDACR_MMD_FUNCTION_ADDR  ((uint16_t)0x0000U)
#define LAN8742_MMDACR_MMD_FUNCTION_DATA  ((uint16_t)0x4000U)
#define LAN8742_MMDACR_MMD_DEV_ADDR       ((uint16_t)0x001FU)
/**
  * @}
  */

/** @defgroup LAN8742_ENCTR_Bit_Definition LAN8742 ENCTR Bit Definition
  * @{
  */
#define LAN8742_ENCTR_TX_ENABLE             ((uint16_t)0x8000U)
#define LAN8742_ENCTR_TX_TIMER              ((uint16_t)0x6000U)
#define LAN8742_ENCTR_TX_TIMER_1S           ((uint16_t)0x0000U)
#define LAN8742_ENCTR_TX_TIMER_768MS        ((uint16_t)0x2000U)
#define LAN8742_ENCTR_TX_TIMER_512MS        ((uint16_t)0x4000U)
#define LAN8742_ENCTR_TX_TIMER_265MS        ((uint16_t)0x6000U)
#define LAN8742_ENCTR_RX_ENABLE             ((uint16_t)0x1000U)
#define LAN8742_ENCTR_RX_MAX_INTERVAL       ((uint16_t)0x0C00U)
#define LAN8742_ENCTR_RX_MAX_INTERVAL_64MS  ((uint16_t)0x0000U)
#define LAN8742_ENCTR_RX_MAX_INTERVAL_256MS ((uint16_t)0x0400U)
#define LAN8742_ENCTR_RX_MAX_INTERVAL_512MS ((uint16_t)0x0800U)
#define LAN8742_ENCTR_RX_MAX_INTERVAL_1S    ((uint16_t)0x0C00U)
#define LAN8742_ENCTR_EX_CROSS_OVER         ((uint16_t)0x0002U)
#define LAN8742_ENCTR_EX_MANUAL_CROSS_OVER  ((uint16_t)0x0001U)
/**
  * @}
  */

/** @defgroup LAN8742_MCSR_Bit_Definition LAN8742 MCSR Bit Definition
  * @{
  */
#define LAN8742_MCSR_EDPWRDOWN        ((uint16_t)0x2000U)
#define LAN8742_MCSR_FARLOOPBACK      ((uint16_t)0x0200U)
#define LAN8742_MCSR_ALTINT           ((uint16_t)0x0040U)
#define LAN8742_MCSR_ENERGYON         ((uint16_t)0x0002U)
/**
  * @}
  */

/** @defgroup LAN8742_SMR_Bit_Definition LAN8742 SMR Bit Definition
  * @{
  */
#define LAN8742_SMR_MODE       ((uint16_t)0x00E0U)
#define LAN8742_SMR_PHY_ADDR   ((uint16_t)0x001FU)
/**
  * @}
  */

/** @defgroup LAN8742_TPDCR_Bit_Definition LAN8742 TPDCR Bit Definition
  * @{
  */
#define LAN8742_TPDCR_DELAY_IN                 ((uint16_t)0x8000U)
#define LAN8742_TPDCR_LINE_BREAK_COUNTER       ((uint16_t)0x7000U)
#define LAN8742_TPDCR_PATTERN_HIGH             ((uint16_t)0x0FC0U)
#define LAN8742_TPDCR_PATTERN_LOW              ((uint16_t)0x003FU)
/**
  * @}
  */

/** @defgroup LAN8742_TCSR_Bit_Definition LAN8742 TCSR Bit Definition
  * @{
  */
#define LAN8742_TCSR_TDR_ENABLE           ((uint16_t)0x8000U)
#define LAN8742_TCSR_TDR_AD_FILTER_ENABLE ((uint16_t)0x4000U)
#define LAN8742_TCSR_TDR_CH_CABLE_TYPE    ((uint16_t)0x0600U)
#define LAN8742_TCSR_TDR_CH_CABLE_DEFAULT ((uint16_t)0x0000U)
#define LAN8742_TCSR_TDR_CH_CABLE_SHORTED ((uint16_t)0x0200U)
#define LAN8742_TCSR_TDR_CH_CABLE_OPEN    ((uint16_t)0x0400U)
#define LAN8742_TCSR_TDR_CH_CABLE_MATCH   ((uint16_t)0x0600U)
#define LAN8742_TCSR_TDR_CH_STATUS        ((uint16_t)0x0100U)
#define LAN8742_TCSR_TDR_CH_LENGTH        ((uint16_t)0x00FFU)
/**
  * @}
  */

/** @defgroup LAN8742_SCSIR_Bit_Definition LAN8742 SCSIR Bit Definition
  * @{
  */
#define LAN8742_SCSIR_AUTO_MDIX_ENABLE    ((uint16_t)0x8000U)
#define LAN8742_SCSIR_CHANNEL_SELECT      ((uint16_t)0x2000U)
#define LAN8742_SCSIR_SQE_DISABLE         ((uint16_t)0x0800U)
#define LAN8742_SCSIR_XPOLALITY           ((uint16_t)0x0010U)
/**
  * @}
  */

/** @defgroup LAN8742_CLR_Bit_Definition LAN8742 CLR Bit Definition
  * @{
  */
#define LAN8742_CLR_CABLE_LENGTH       ((uint16_t)0xF000U)
/**
  * @}
  */

/** @defgroup LAN8742_IMR_ISFR_Bit_Definition LAN8742 IMR ISFR Bit Definition
  * @{
  */
#define LAN8742_INT_8       ((uint16_t)0x0100U)
#define LAN8742_INT_7       ((uint16_t)0x0080U)
#define LAN8742_INT_6       ((uint16_t)0x0040U)
#define LAN8742_INT_5       ((uint16_t)0x0020U)
#define LAN8742_INT_4       ((uint16_t)0x0010U)
#define LAN8742_INT_3       ((uint16_t)0x0008U)
#define LAN8742_INT_2       ((uint16_t)0x0004U)
#define LAN8742_INT_1       ((uint16_t)0x0002U)
/**
  * @}
  */

/** @defgroup LAN8742_PHYSCSR_Bit_Definition LAN8742 PHYSCSR Bit Definition
  * @{
  */
#define LAN8742_PHYSCSR_AUTONEGO_DONE   ((uint16_t)0x1000U)
#define LAN8742_PHYSCSR_HCDSPEEDMASK    ((uint16_t)0x001CU)
#define LAN8742_PHYSCSR_10BT_HD         ((uint16_t)0x0004U)
#define LAN8742_PHYSCSR_10BT_FD         ((uint16_t)0x0014U)
#define LAN8742_PHYSCSR_100BTX_HD       ((uint16_t)0x0008U)
#define LAN8742_PHYSCSR_100BTX_FD       ((uint16_t)0x0018U) 
/**
  * @}
  */
    
/** @defgroup LAN8742_Status LAN8742 Status
  * @{
  */    

#define  LAN8742_STATUS_READ_ERROR            ((int32_t)-5)
#define  LAN8742_STATUS_WRITE_ERROR           ((int32_t)-4)
#define  LAN8742_STATUS_ADDRESS_ERROR         ((int32_t)-3)
#define  LAN8742_STATUS_RESET_TIMEOUT         ((int32_t)-2)
#define  LAN8742_STATUS_ERROR                 ((int32_t)-1)
#define  LAN8742_STATUS_OK                    ((int32_t) 0)
#define  LAN8742_STATUS_LINK_DOWN             ((int32_t) 1)
#define  LAN8742_STATUS_100MBITS_FULLDUPLEX   ((int32_t) 2)
#define  LAN8742_STATUS_100MBITS_HALFDUPLEX   ((int32_t) 3)
#define  LAN8742_STATUS_10MBITS_FULLDUPLEX    ((int32_t) 4)
#define  LAN8742_STATUS_10MBITS_HALFDUPLEX    ((int32_t) 5)
#define  LAN8742_STATUS_AUTONEGO_NOTDONE      ((int32_t) 6)
/**
  * @}
  */

/** @defgroup LAN8742_IT_Flags LAN8742 IT Flags
  * @{
  */     
#define  LAN8742_WOL_IT                        LAN8742_INT_8
#define  LAN8742_ENERGYON_IT                   LAN8742_INT_7
#define  LAN8742_AUTONEGO_COMPLETE_IT          LAN8742_INT_6
#define  LAN8742_REMOTE_FAULT_IT               LAN8742_INT_5
#define  LAN8742_LINK_DOWN_IT                  LAN8742_INT_4
#define  LAN8742_AUTONEGO_LP_ACK_IT            LAN8742_INT_3
#define  LAN8742_PARALLEL_DETECTION_FAULT_IT   LAN8742_INT_2
#define  LAN8742_AUTONEGO_PAGE_RECEIVED_IT     LAN8742_INT_1
/**
  * @}
  */

/**
  * @}
  */

/* Exported types ------------------------------------------------------------*/ 
/** @defgroup LAN8742_Exported_Types LAN8742 Exported Types
  * @{
  */
typedef int32_t  (*lan8742_Init_Func) (void); 
typedef int32_t  (*lan8742_DeInit_Func) (void);
typedef int32_t  (*lan8742_ReadReg_Func)   (uint32_t, uint32_t, uint32_t *);
typedef int32_t  (*lan8742_WriteReg_Func)  (uint32_t, uint32_t, uint32_t);
typedef int32_t  (*lan8742_GetTick_Func)  (void);

typedef struct 
{                   
  lan8742_Init_Func      Init; 
  lan8742_DeInit_Func    DeInit;
  lan8742_WriteReg_Func  WriteReg;
  lan8742_ReadReg_Func   ReadReg; 
  lan8742_GetTick_Func   GetTick;   
} lan8742_IOCtx_t;  

  
typedef struct 
{
  uint32_t            DevAddr;
  uint32_t            Is_Initialized;
  lan8742_IOCtx_t     IO;
  void               *pData;
}lan8742_Object_t;
/**
  * @}
  */ 

/* Exported macro ------------------------------------------------------------*/
/* Exported functions --------------------------------------------------------*/
/** @defgroup LAN8742_Exported_Functions LAN8742 Exported Functions
  * @{
  */
int32_t LAN8742_RegisterBusIO(lan8742_Object_t *pObj, lan8742_IOCtx_t *ioctx);
int32_t LAN8742_Init(lan8742_Object_t *pObj);
int32_t LAN8742_DeInit(lan8742_Object_t *pObj);
int32_t LAN8742_DisablePowerDownMode(lan8742_Object_t *pObj);
int32_t LAN8742_EnablePowerDownMode(lan8742_Object_t *pObj);
int32_t LAN8742_StartAutoNego(lan8742_Object_t *pObj);
int32_t LAN8742_GetLinkState(lan8742_Object_t *pObj);
int32_t LAN8742_SetLinkState(lan8742_Object_t *pObj, uint32_t LinkState);
int32_t LAN8742_EnableLoopbackMode(lan8742_Object_t *pObj);
int32_t LAN8742_DisableLoopbackMode(lan8742_Object_t *pObj);
int32_t LAN8742_EnableIT(lan8742_Object_t *pObj, uint32_t Interrupt);
int32_t LAN8742_DisableIT(lan8742_Object_t *pObj, uint32_t Interrupt);
int32_t LAN8742_ClearIT(lan8742_Object_t *pObj, uint32_t Interrupt);
int32_t LAN8742_GetITStatus(lan8742_Object_t *pObj, uint32_t Interrupt);
/**
  * @}
  */ 

#ifdef __cplusplus
}
#endif
#endif /* LAN8742_H */


/**
  * @}
  */ 

/**
  * @}
  */

/**
  * @}
  */ 

/**
  * @}
  */       
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

LAN8720A的BSR寄存器

注意GPIO复用

LWIP配置

添加代码

• 复位PHY引脚
  本次PI1连接PHY的复位引脚，低电平复位
  在生成的void HAL_ETH_MspInit(ETH_HandleTypeDef* ethHandle)在工程文件夹LWIP\Target\ethernetif.c下添加复位PHY代码，具体延时时间根据PHY来设置

• PHY配置
  置位LAN8720A的自动协商（自适应、自动适配，速率与双工）并等待配置完毕
  在Drivers\BSP\Components\lan8742\lan8742.c的函数LAN8742_Init()
  注意：每次配置最好做备份，因为每使用CUBEMX生成工程，用户代码都会被清除
  
• 主函数中添加MX_LWIP_Process();
• Keil工程配置，勾上就对了（不勾上会生成 BKPT 0xAB，此时MCU会死机，具体原因未知）
  

下载代码，实现现象

工程文件下载链接
【STM32】HAL库-以太网外设-LAN8720A-LWIP-无操作系统-PING

说明

初始化调用过程

MX_LWIP_Init() -> netif_add() -> ethernetif_init() -> low_level_init() -> HAL_ETH_Init() -> LAN8742_Init() -> ethernet_link_check_state()Get link state