PHY——LAN8720A 寄存器读写 (二)

news2025/4/2 3:39:07

文章目录

  • PHY——LAN8720A 寄存器读写 (二)
    • 工程配置
    • 引脚初始化代码
    • 以太网初始化代码
    • PHY 接口实现
    • LAN8720 接口实现
    • PHY 接口测试

PHY——LAN8720A 寄存器读写 (二)

工程配置

这里以野火电子的 F429 开发板为例，配置以太网外设
在这里插入图片描述
这里有一点需要注意原理图 RMII_TXD0, RMII_TXD1 使用的分别是 PG13, PG14，如下图

在这里插入图片描述
但是当 CubeMx 使能 ETH 外设的 RMII 时候，默认使用的引脚是 PB12 和 PB13
在这里插入图片描述
这里需要手动修改
在这里插入图片描述
这样 RMII 的引脚和以太网相关时钟就配置好了，这里我们只借助 CubeMx 配置这两个，PHY的驱动自己来实现

引脚初始化代码

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 */
    /* ETH clock enable */
    __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 */

  /* USER CODE END ETH_MspInit 1 */
  }
}

以太网初始化代码

void MX_ETH_Init(void)
{

  /* USER CODE BEGIN ETH_Init 0 */

  /* USER CODE END ETH_Init 0 */

   static uint8_t MACAddr[6];

  /* USER CODE BEGIN ETH_Init 1 */

  /* USER CODE END ETH_Init 1 */
  heth.Instance = ETH;
  MACAddr[0] = 0x00;
  MACAddr[1] = 0x80;
  MACAddr[2] = 0xE1;
  MACAddr[3] = 0x00;
  MACAddr[4] = 0x00;
  MACAddr[5] = 0x00;
  heth.Init.MACAddr = &MACAddr[0];
  heth.Init.MediaInterface = HAL_ETH_RMII_MODE;
  heth.Init.TxDesc = DMATxDscrTab;
  heth.Init.RxDesc = DMARxDscrTab;
  heth.Init.RxBuffLen = 1524;

  /* USER CODE BEGIN MACADDRESS */

  /* USER CODE END MACADDRESS */

  if (HAL_ETH_Init(&heth) != HAL_OK)
  {
    Error_Handler();
  }

  memset(&TxConfig, 0 , sizeof(ETH_TxPacketConfig));
  TxConfig.Attributes = ETH_TX_PACKETS_FEATURES_CSUM | ETH_TX_PACKETS_FEATURES_CRCPAD;
  TxConfig.ChecksumCtrl = ETH_CHECKSUM_IPHDR_PAYLOAD_INSERT_PHDR_CALC;
  TxConfig.CRCPadCtrl = ETH_CRC_PAD_INSERT;
  /* USER CODE BEGIN ETH_Init 2 */

  /* USER CODE END ETH_Init 2 */

}

PHY 接口实现

ethernetif.c
这个文件其实主要实现了两个接口 ETH_PHY_IO_ReadReg 和 ETH_PHY_IO_WriteReg

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * File Name          : ethernetif.c
  * Description        : This file provides code for the configuration
  *                      of the ethernetif.c MiddleWare.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2025 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "ethernetif.h"
#include "lan8720.h"
#include <string.h>

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/* USER CODE BEGIN 1 */

/* USER CODE END 1 */

/* Private function prototypes -----------------------------------------------*/
int32_t ETH_PHY_IO_Init(void);
int32_t ETH_PHY_IO_DeInit (void);
int32_t ETH_PHY_IO_ReadReg(uint32_t DevAddr, uint32_t RegAddr, uint32_t *pRegVal);
int32_t ETH_PHY_IO_WriteReg(uint32_t DevAddr, uint32_t RegAddr, uint32_t RegVal);
int32_t ETH_PHY_IO_GetTick(void);

lan8720_Object_t LAN8720;
lan8720_IOCtx_t  LAN8720_IOCtx = {ETH_PHY_IO_Init,
                                  ETH_PHY_IO_DeInit,
                                  ETH_PHY_IO_WriteReg,
                                  ETH_PHY_IO_ReadReg,
                                  ETH_PHY_IO_GetTick};

/* USER CODE BEGIN 3 */

/* USER CODE END 3 */

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/* USER CODE END 6 */

/*******************************************************************************
                       PHI IO Functions
*******************************************************************************/
/**
  * @brief  Initializes the MDIO interface GPIO and clocks.
  * @param  None
  * @retval 0 if OK, -1 if ERROR
  */
int32_t ETH_PHY_IO_Init(void)
{
  /* We assume that MDIO GPIO configuration is already done
     in the ETH_MspInit() else it should be done here
  */

  /* Configure the MDIO Clock */
  HAL_ETH_SetMDIOClockRange(&heth);

  return 0;
}

/**
  * @brief  De-Initializes the MDIO interface .
  * @param  None
  * @retval 0 if OK, -1 if ERROR
  */
int32_t ETH_PHY_IO_DeInit (void)
{
  return 0;
}

/**
  * @brief  Read a PHY register through the MDIO interface.
  * @param  DevAddr: PHY port address
  * @param  RegAddr: PHY register address
  * @param  pRegVal: pointer to hold the register value
  * @retval 0 if OK -1 if Error
  */
int32_t ETH_PHY_IO_ReadReg(uint32_t DevAddr, uint32_t RegAddr, uint32_t *pRegVal)
{
  if(HAL_ETH_ReadPHYRegister(&heth, DevAddr, RegAddr, pRegVal) != HAL_OK)
  {
    return -1;
  }

  return 0;
}

/**
  * @brief  Write a value to a PHY register through the MDIO interface.
  * @param  DevAddr: PHY port address
  * @param  RegAddr: PHY register address
  * @param  RegVal: Value to be written
  * @retval 0 if OK -1 if Error
  */
int32_t ETH_PHY_IO_WriteReg(uint32_t DevAddr, uint32_t RegAddr, uint32_t RegVal)
{
  if(HAL_ETH_WritePHYRegister(&heth, DevAddr, RegAddr, RegVal) != HAL_OK)
  {
    return -1;
  }

  return 0;
}

/**
  * @brief  Get the time in millisecons used for internal PHY driver process.
  * @retval Time value
  */
int32_t ETH_PHY_IO_GetTick(void)
{
  return HAL_GetTick();
}
/* USER CODE BEGIN 8 */

/* USER CODE END 8 */

ethernetif.h 文件

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
  * File Name          : ethernetif.h
  * Description        : This file provides initialization code for LWIP
  *                      middleWare.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2025 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */

#ifndef __ETHERNETIF_H__
#define __ETHERNETIF_H__

/* USER CODE BEGIN 0 */
#include "main.h"
#include "lan8720.h"
extern ETH_HandleTypeDef heth;
extern lan8720_Object_t LAN8720;
extern lan8720_IOCtx_t  LAN8720_IOCtx;
/* USER CODE END 0 */

/* USER CODE BEGIN 1 */

/* USER CODE END 1 */
#endif

LAN8720 接口实现

lan8720.c

/**
  ******************************************************************************
  * @file    lan8720.c
  * @author  MCD Application Team
  * @brief   This file provides a set of functions needed to manage the LAN742
  *          PHY devices.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2017 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "lan8720.h"

/** @addtogroup BSP
  * @{
  */

/** @addtogroup Component
  * @{
  */

/** @defgroup LAN8720 LAN8720
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/** @defgroup LAN8720_Private_Defines LAN8720 Private Defines
  * @{
  */
#define LAN8720_MAX_DEV_ADDR   ((uint32_t)31U)
/**
  * @}
  */

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/** @defgroup LAN8720_Private_Functions LAN8720 Private Functions
  * @{
  */

/**
  * @brief  Register IO functions to component object
  * @param  pObj: device object  of LAN8720_Object_t.
  * @param  ioctx: holds device IO functions.
  * @retval LAN8720_STATUS_OK  if OK
  *         LAN8720_STATUS_ERROR if missing mandatory function
  */
int32_t  LAN8720_RegisterBusIO(lan8720_Object_t *pObj, lan8720_IOCtx_t *ioctx)
{
  if(!pObj || !ioctx->ReadReg || !ioctx->WriteReg || !ioctx->GetTick)
  {
    return LAN8720_STATUS_ERROR;
  }

  pObj->IO.Init = ioctx->Init;
  pObj->IO.DeInit = ioctx->DeInit;
  pObj->IO.ReadReg = ioctx->ReadReg;
  pObj->IO.WriteReg = ioctx->WriteReg;
  pObj->IO.GetTick = ioctx->GetTick;

  return LAN8720_STATUS_OK;
}

/**
  * @brief  Initialize the lan8720 and configure the needed hardware resources
  * @param  pObj: device object LAN8720_Object_t.
  * @retval LAN8720_STATUS_OK  if OK
  *         LAN8720_STATUS_ADDRESS_ERROR if cannot find device address
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  */
 int32_t LAN8720_Init(lan8720_Object_t *pObj)
 {
   uint32_t regvalue = 0, addr = 0;
   int32_t status = LAN8720_STATUS_OK;

   if(pObj->Is_Initialized == 0)
   {
     if(pObj->IO.Init != 0)
     {
       /* GPIO and Clocks initialization */
       pObj->IO.Init();
     }

     /* for later check */
     pObj->DevAddr = LAN8720_MAX_DEV_ADDR + 1;

     /* Get the device address from special mode register */
     for(addr = 0; addr <= LAN8720_MAX_DEV_ADDR; addr ++)
     {
       if(pObj->IO.ReadReg(addr, LAN8720_SMR, &regvalue) < 0)
       {
         status = LAN8720_STATUS_READ_ERROR;
         /* Can't read from this device address
            continue with next address */
         continue;
       }

       if((regvalue & LAN8720_SMR_PHY_ADDR) == addr)
       {
         pObj->DevAddr = addr;
         status = LAN8720_STATUS_OK;
         break;
       }
     }

     if(pObj->DevAddr > LAN8720_MAX_DEV_ADDR)
     {
       status = LAN8720_STATUS_ADDRESS_ERROR;
     }

     /* if device address is matched */
     if(status == LAN8720_STATUS_OK)
     {
       pObj->Is_Initialized = 1;
     }
   }

   return status;
 }

/**
  * @brief  De-Initialize the lan8720 and it's hardware resources
  * @param  pObj: device object LAN8720_Object_t.
  * @retval None
  */
int32_t LAN8720_DeInit(lan8720_Object_t *pObj)
{
  if(pObj->Is_Initialized)
  {
    if(pObj->IO.DeInit != 0)
    {
      if(pObj->IO.DeInit() < 0)
      {
        return LAN8720_STATUS_ERROR;
      }
    }

    pObj->Is_Initialized = 0;
  }

  return LAN8720_STATUS_OK;
}

/**
  * @brief  Disable the LAN8720 power down mode.
  * @param  pObj: device object LAN8720_Object_t.
  * @retval LAN8720_STATUS_OK  if OK
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  *         LAN8720_STATUS_WRITE_ERROR if cannot write to register
  */
int32_t LAN8720_DisablePowerDownMode(lan8720_Object_t *pObj)
{
  uint32_t readval = 0;
  int32_t status = LAN8720_STATUS_OK;

  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_BCR, &readval) >= 0)
  {
    readval &= ~LAN8720_BCR_POWER_DOWN;

    /* Apply configuration */
    if(pObj->IO.WriteReg(pObj->DevAddr, LAN8720_BCR, readval) < 0)
    {
      status =  LAN8720_STATUS_WRITE_ERROR;
    }
  }
  else
  {
    status = LAN8720_STATUS_READ_ERROR;
  }

  return status;
}

/**
  * @brief  Enable the LAN8720 power down mode.
  * @param  pObj: device object LAN8720_Object_t.
  * @retval LAN8720_STATUS_OK  if OK
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  *         LAN8720_STATUS_WRITE_ERROR if cannot write to register
  */
int32_t LAN8720_EnablePowerDownMode(lan8720_Object_t *pObj)
{
  uint32_t readval = 0;
  int32_t status = LAN8720_STATUS_OK;

  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_BCR, &readval) >= 0)
  {
    readval |= LAN8720_BCR_POWER_DOWN;

    /* Apply configuration */
    if(pObj->IO.WriteReg(pObj->DevAddr, LAN8720_BCR, readval) < 0)
    {
      status =  LAN8720_STATUS_WRITE_ERROR;
    }
  }
  else
  {
    status = LAN8720_STATUS_READ_ERROR;
  }

  return status;
}

/**
  * @brief  Start the auto negotiation process.
  * @param  pObj: device object LAN8720_Object_t.
  * @retval LAN8720_STATUS_OK  if OK
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  *         LAN8720_STATUS_WRITE_ERROR if cannot write to register
  */
int32_t LAN8720_StartAutoNego(lan8720_Object_t *pObj)
{
  uint32_t readval = 0;
  int32_t status = LAN8720_STATUS_OK;

  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_BCR, &readval) >= 0)
  {
    readval |= LAN8720_BCR_AUTONEGO_EN;

    /* Apply configuration */
    if(pObj->IO.WriteReg(pObj->DevAddr, LAN8720_BCR, readval) < 0)
    {
      status =  LAN8720_STATUS_WRITE_ERROR;
    }
  }
  else
  {
    status = LAN8720_STATUS_READ_ERROR;
  }

  return status;
}

/**
  * @brief  Get the link state of LAN8720 device.
  * @param  pObj: Pointer to device object.
  * @param  pLinkState: Pointer to link state
  * @retval LAN8720_STATUS_LINK_DOWN  if link is down
  *         LAN8720_STATUS_AUTONEGO_NOTDONE if Auto nego not completed
  *         LAN8720_STATUS_100MBITS_FULLDUPLEX if 100Mb/s FD
  *         LAN8720_STATUS_100MBITS_HALFDUPLEX if 100Mb/s HD
  *         LAN8720_STATUS_10MBITS_FULLDUPLEX  if 10Mb/s FD
  *         LAN8720_STATUS_10MBITS_HALFDUPLEX  if 10Mb/s HD
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  *         LAN8720_STATUS_WRITE_ERROR if cannot write to register
  */
int32_t LAN8720_GetLinkState(lan8720_Object_t *pObj)
{
  uint32_t readval = 0;

  /* Read Status register  */
  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_BSR, &readval) < 0)
  {
    return LAN8720_STATUS_READ_ERROR;
  }

  /* Read Status register again */
  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_BSR, &readval) < 0)
  {
    return LAN8720_STATUS_READ_ERROR;
  }

  if((readval & LAN8720_BSR_LINK_STATUS) == 0)
  {
    /* Return Link Down status */
    return LAN8720_STATUS_LINK_DOWN;
  }

  /* Check Auto negotiation */
  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_BCR, &readval) < 0)
  {
    return LAN8720_STATUS_READ_ERROR;
  }

  if((readval & LAN8720_BCR_AUTONEGO_EN) != LAN8720_BCR_AUTONEGO_EN)
  {
    if(((readval & LAN8720_BCR_SPEED_SELECT) == LAN8720_BCR_SPEED_SELECT) && ((readval & LAN8720_BCR_DUPLEX_MODE) == LAN8720_BCR_DUPLEX_MODE))
    {
      return LAN8720_STATUS_100MBITS_FULLDUPLEX;
    }
    else if ((readval & LAN8720_BCR_SPEED_SELECT) == LAN8720_BCR_SPEED_SELECT)
    {
      return LAN8720_STATUS_100MBITS_HALFDUPLEX;
    }
    else if ((readval & LAN8720_BCR_DUPLEX_MODE) == LAN8720_BCR_DUPLEX_MODE)
    {
      return LAN8720_STATUS_10MBITS_FULLDUPLEX;
    }
    else
    {
      return LAN8720_STATUS_10MBITS_HALFDUPLEX;
    }
  }
  else /* Auto Nego enabled */
  {
    if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_PHYSCSR, &readval) < 0)
    {
      return LAN8720_STATUS_READ_ERROR;
    }

    /* Check if auto nego not done */
    if((readval & LAN8720_PHYSCSR_AUTONEGO_DONE) == 0)
    {
      return LAN8720_STATUS_AUTONEGO_NOTDONE;
    }

    if((readval & LAN8720_PHYSCSR_HCDSPEEDMASK) == LAN8720_PHYSCSR_100BTX_FD)
    {
      return LAN8720_STATUS_100MBITS_FULLDUPLEX;
    }
    else if ((readval & LAN8720_PHYSCSR_HCDSPEEDMASK) == LAN8720_PHYSCSR_100BTX_HD)
    {
      return LAN8720_STATUS_100MBITS_HALFDUPLEX;
    }
    else if ((readval & LAN8720_PHYSCSR_HCDSPEEDMASK) == LAN8720_PHYSCSR_10BT_FD)
    {
      return LAN8720_STATUS_10MBITS_FULLDUPLEX;
    }
    else
    {
      return LAN8720_STATUS_10MBITS_HALFDUPLEX;
    }
  }
}

/**
  * @brief  Set the link state of LAN8720 device.
  * @param  pObj: Pointer to device object.
  * @param  pLinkState: link state can be one of the following
  *         LAN8720_STATUS_100MBITS_FULLDUPLEX if 100Mb/s FD
  *         LAN8720_STATUS_100MBITS_HALFDUPLEX if 100Mb/s HD
  *         LAN8720_STATUS_10MBITS_FULLDUPLEX  if 10Mb/s FD
  *         LAN8720_STATUS_10MBITS_HALFDUPLEX  if 10Mb/s HD
  * @retval LAN8720_STATUS_OK  if OK
  *         LAN8720_STATUS_ERROR  if parameter error
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  *         LAN8720_STATUS_WRITE_ERROR if cannot write to register
  */
int32_t LAN8720_SetLinkState(lan8720_Object_t *pObj, uint32_t LinkState)
{
  uint32_t bcrvalue = 0;
  int32_t status = LAN8720_STATUS_OK;

  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_BCR, &bcrvalue) >= 0)
  {
    /* Disable link config (Auto nego, speed and duplex) */
    bcrvalue &= ~(LAN8720_BCR_AUTONEGO_EN | LAN8720_BCR_SPEED_SELECT | LAN8720_BCR_DUPLEX_MODE);

    if(LinkState == LAN8720_STATUS_100MBITS_FULLDUPLEX)
    {
      bcrvalue |= (LAN8720_BCR_SPEED_SELECT | LAN8720_BCR_DUPLEX_MODE);
    }
    else if (LinkState == LAN8720_STATUS_100MBITS_HALFDUPLEX)
    {
      bcrvalue |= LAN8720_BCR_SPEED_SELECT;
    }
    else if (LinkState == LAN8720_STATUS_10MBITS_FULLDUPLEX)
    {
      bcrvalue |= LAN8720_BCR_DUPLEX_MODE;
    }
    else
    {
      /* Wrong link status parameter */
      status = LAN8720_STATUS_ERROR;
    }
  }
  else
  {
    status = LAN8720_STATUS_READ_ERROR;
  }

  if(status == LAN8720_STATUS_OK)
  {
    /* Apply configuration */
    if(pObj->IO.WriteReg(pObj->DevAddr, LAN8720_BCR, bcrvalue) < 0)
    {
      status = LAN8720_STATUS_WRITE_ERROR;
    }
  }

  return status;
}

/**
  * @brief  Enable loopback mode.
  * @param  pObj: Pointer to device object.
  * @retval LAN8720_STATUS_OK  if OK
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  *         LAN8720_STATUS_WRITE_ERROR if cannot write to register
  */
int32_t LAN8720_EnableLoopbackMode(lan8720_Object_t *pObj)
{
  uint32_t readval = 0;
  int32_t status = LAN8720_STATUS_OK;

  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_BCR, &readval) >= 0)
  {
    readval |= LAN8720_BCR_LOOPBACK;

    /* Apply configuration */
    if(pObj->IO.WriteReg(pObj->DevAddr, LAN8720_BCR, readval) < 0)
    {
      status = LAN8720_STATUS_WRITE_ERROR;
    }
  }
  else
  {
    status = LAN8720_STATUS_READ_ERROR;
  }

  return status;
}

/**
  * @brief  Disable loopback mode.
  * @param  pObj: Pointer to device object.
  * @retval LAN8720_STATUS_OK  if OK
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  *         LAN8720_STATUS_WRITE_ERROR if cannot write to register
  */
int32_t LAN8720_DisableLoopbackMode(lan8720_Object_t *pObj)
{
  uint32_t readval = 0;
  int32_t status = LAN8720_STATUS_OK;

  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_BCR, &readval) >= 0)
  {
    readval &= ~LAN8720_BCR_LOOPBACK;

    /* Apply configuration */
    if(pObj->IO.WriteReg(pObj->DevAddr, LAN8720_BCR, readval) < 0)
    {
      status =  LAN8720_STATUS_WRITE_ERROR;
    }
  }
  else
  {
    status = LAN8720_STATUS_READ_ERROR;
  }

  return status;
}

/**
  * @brief  Enable IT source.
  * @param  pObj: Pointer to device object.
  * @param  Interrupt: IT source to be enabled
  *         should be a value or a combination of the following:
  *         LAN8720_WOL_IT
  *         LAN8720_ENERGYON_IT
  *         LAN8720_AUTONEGO_COMPLETE_IT
  *         LAN8720_REMOTE_FAULT_IT
  *         LAN8720_LINK_DOWN_IT
  *         LAN8720_AUTONEGO_LP_ACK_IT
  *         LAN8720_PARALLEL_DETECTION_FAULT_IT
  *         LAN8720_AUTONEGO_PAGE_RECEIVED_IT
  * @retval LAN8720_STATUS_OK  if OK
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  *         LAN8720_STATUS_WRITE_ERROR if cannot write to register
  */
int32_t LAN8720_EnableIT(lan8720_Object_t *pObj, uint32_t Interrupt)
{
  uint32_t readval = 0;
  int32_t status = LAN8720_STATUS_OK;

  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_IMR, &readval) >= 0)
  {
    readval |= Interrupt;

    /* Apply configuration */
    if(pObj->IO.WriteReg(pObj->DevAddr, LAN8720_IMR, readval) < 0)
    {
      status =  LAN8720_STATUS_WRITE_ERROR;
    }
  }
  else
  {
    status = LAN8720_STATUS_READ_ERROR;
  }

  return status;
}

/**
  * @brief  Disable IT source.
  * @param  pObj: Pointer to device object.
  * @param  Interrupt: IT source to be disabled
  *         should be a value or a combination of the following:
  *         LAN8720_WOL_IT
  *         LAN8720_ENERGYON_IT
  *         LAN8720_AUTONEGO_COMPLETE_IT
  *         LAN8720_REMOTE_FAULT_IT
  *         LAN8720_LINK_DOWN_IT
  *         LAN8720_AUTONEGO_LP_ACK_IT
  *         LAN8720_PARALLEL_DETECTION_FAULT_IT
  *         LAN8720_AUTONEGO_PAGE_RECEIVED_IT
  * @retval LAN8720_STATUS_OK  if OK
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  *         LAN8720_STATUS_WRITE_ERROR if cannot write to register
  */
int32_t LAN8720_DisableIT(lan8720_Object_t *pObj, uint32_t Interrupt)
{
  uint32_t readval = 0;
  int32_t status = LAN8720_STATUS_OK;

  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_IMR, &readval) >= 0)
  {
    readval &= ~Interrupt;

    /* Apply configuration */
    if(pObj->IO.WriteReg(pObj->DevAddr, LAN8720_IMR, readval) < 0)
    {
      status = LAN8720_STATUS_WRITE_ERROR;
    }
  }
  else
  {
    status = LAN8720_STATUS_READ_ERROR;
  }

  return status;
}

/**
  * @brief  Clear IT flag.
  * @param  pObj: Pointer to device object.
  * @param  Interrupt: IT flag to be cleared
  *         should be a value or a combination of the following:
  *         LAN8720_WOL_IT
  *         LAN8720_ENERGYON_IT
  *         LAN8720_AUTONEGO_COMPLETE_IT
  *         LAN8720_REMOTE_FAULT_IT
  *         LAN8720_LINK_DOWN_IT
  *         LAN8720_AUTONEGO_LP_ACK_IT
  *         LAN8720_PARALLEL_DETECTION_FAULT_IT
  *         LAN8720_AUTONEGO_PAGE_RECEIVED_IT
  * @retval LAN8720_STATUS_OK  if OK
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  */
int32_t  LAN8720_ClearIT(lan8720_Object_t *pObj, uint32_t Interrupt)
{
  uint32_t readval = 0;
  int32_t status = LAN8720_STATUS_OK;

  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_ISFR, &readval) < 0)
  {
    status =  LAN8720_STATUS_READ_ERROR;
  }

  return status;
}

/**
  * @brief  Get IT Flag status.
  * @param  pObj: Pointer to device object.
  * @param  Interrupt: IT Flag to be checked,
  *         should be a value or a combination of the following:
  *         LAN8720_WOL_IT
  *         LAN8720_ENERGYON_IT
  *         LAN8720_AUTONEGO_COMPLETE_IT
  *         LAN8720_REMOTE_FAULT_IT
  *         LAN8720_LINK_DOWN_IT
  *         LAN8720_AUTONEGO_LP_ACK_IT
  *         LAN8720_PARALLEL_DETECTION_FAULT_IT
  *         LAN8720_AUTONEGO_PAGE_RECEIVED_IT
  * @retval 1 IT flag is SET
  *         0 IT flag is RESET
  *         LAN8720_STATUS_READ_ERROR if cannot read register
  */
int32_t LAN8720_GetITStatus(lan8720_Object_t *pObj, uint32_t Interrupt)
{
  uint32_t readval = 0;
  int32_t status = 0;

  if(pObj->IO.ReadReg(pObj->DevAddr, LAN8720_ISFR, &readval) >= 0)
  {
    status = ((readval & Interrupt) == Interrupt);
  }
  else
  {
    status = LAN8720_STATUS_READ_ERROR;
  }

  return status;
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

lan8720.h
这个文件主要定义 PHY 的相关寄存器以及各个 bit，例如 LAN8720_BCR， LAN8720_BSR 和 LAN8720_BCR_SOFT_RESET 等

/**
  ******************************************************************************
  * @file    lan8720.h
  * @author  MCD Application Team
  * @brief   This file contains all the functions prototypes for the
  *          lan8720.c PHY driver.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2017 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */ 

/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef LAN8720_H
#define LAN8720_H

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

/** @addtogroup BSP
  * @{
  */ 

/** @addtogroup Component
  * @{
  */
    
/** @defgroup LAN8720
  * @{
  */    
/* Exported constants --------------------------------------------------------*/
/** @defgroup LAN8720_Exported_Constants LAN8720 Exported Constants
  * @{
  */ 
  
/** @defgroup LAN8720_Registers_Mapping LAN8720 Registers Mapping
  * @{
  */ 
#define LAN8720_BCR      ((uint16_t)0x0000U)
#define LAN8720_BSR      ((uint16_t)0x0001U)
#define LAN8720_PHYI1R   ((uint16_t)0x0002U)
#define LAN8720_PHYI2R   ((uint16_t)0x0003U)
#define LAN8720_ANAR     ((uint16_t)0x0004U)
#define LAN8720_ANLPAR   ((uint16_t)0x0005U)
#define LAN8720_ANER     ((uint16_t)0x0006U)
#define LAN8720_ANNPTR   ((uint16_t)0x0007U)
#define LAN8720_ANNPRR   ((uint16_t)0x0008U)
#define LAN8720_MMDACR   ((uint16_t)0x000DU)
#define LAN8720_MMDAADR  ((uint16_t)0x000EU)
#define LAN8720_ENCTR    ((uint16_t)0x0010U)
#define LAN8720_MCSR     ((uint16_t)0x0011U)
#define LAN8720_SMR      ((uint16_t)0x0012U)
#define LAN8720_TPDCR    ((uint16_t)0x0018U)
#define LAN8720_TCSR     ((uint16_t)0x0019U)
#define LAN8720_SECR     ((uint16_t)0x001AU)
#define LAN8720_SCSIR    ((uint16_t)0x001BU)
#define LAN8720_CLR      ((uint16_t)0x001CU)
#define LAN8720_ISFR     ((uint16_t)0x001DU)
#define LAN8720_IMR      ((uint16_t)0x001EU)
#define LAN8720_PHYSCSR  ((uint16_t)0x001FU)
/**
  * @}
  */

/** @defgroup LAN8720_BCR_Bit_Definition LAN8720 BCR Bit Definition
  * @{
  */    
#define LAN8720_BCR_SOFT_RESET         ((uint16_t)0x8000U)
#define LAN8720_BCR_LOOPBACK           ((uint16_t)0x4000U)
#define LAN8720_BCR_SPEED_SELECT       ((uint16_t)0x2000U)
#define LAN8720_BCR_AUTONEGO_EN        ((uint16_t)0x1000U)
#define LAN8720_BCR_POWER_DOWN         ((uint16_t)0x0800U)
#define LAN8720_BCR_ISOLATE            ((uint16_t)0x0400U)
#define LAN8720_BCR_RESTART_AUTONEGO   ((uint16_t)0x0200U)
#define LAN8720_BCR_DUPLEX_MODE        ((uint16_t)0x0100U) 
/**
  * @}
  */

/** @defgroup LAN8720_BSR_Bit_Definition LAN8720 BSR Bit Definition
  * @{
  */   
#define LAN8720_BSR_100BASE_T4       ((uint16_t)0x8000U)
#define LAN8720_BSR_100BASE_TX_FD    ((uint16_t)0x4000U)
#define LAN8720_BSR_100BASE_TX_HD    ((uint16_t)0x2000U)
#define LAN8720_BSR_10BASE_T_FD      ((uint16_t)0x1000U)
#define LAN8720_BSR_10BASE_T_HD      ((uint16_t)0x0800U)
#define LAN8720_BSR_100BASE_T2_FD    ((uint16_t)0x0400U)
#define LAN8720_BSR_100BASE_T2_HD    ((uint16_t)0x0200U)
#define LAN8720_BSR_EXTENDED_STATUS  ((uint16_t)0x0100U)
#define LAN8720_BSR_AUTONEGO_CPLT    ((uint16_t)0x0020U)
#define LAN8720_BSR_REMOTE_FAULT     ((uint16_t)0x0010U)
#define LAN8720_BSR_AUTONEGO_ABILITY ((uint16_t)0x0008U)
#define LAN8720_BSR_LINK_STATUS      ((uint16_t)0x0004U)
#define LAN8720_BSR_JABBER_DETECT    ((uint16_t)0x0002U)
#define LAN8720_BSR_EXTENDED_CAP     ((uint16_t)0x0001U)
/**
  * @}
  */

/** @defgroup LAN8720_PHYI1R_Bit_Definition LAN8720 PHYI1R Bit Definition
  * @{
  */
#define LAN8720_PHYI1R_OUI_3_18           ((uint16_t)0xFFFFU)
/**
  * @}
  */

/** @defgroup LAN8720_PHYI2R_Bit_Definition LAN8720 PHYI2R Bit Definition
  * @{
  */
#define LAN8720_PHYI2R_OUI_19_24          ((uint16_t)0xFC00U)
#define LAN8720_PHYI2R_MODEL_NBR          ((uint16_t)0x03F0U)
#define LAN8720_PHYI2R_REVISION_NBR       ((uint16_t)0x000FU)
/**
  * @}
  */

/** @defgroup LAN8720_ANAR_Bit_Definition LAN8720 ANAR Bit Definition
  * @{
  */
#define LAN8720_ANAR_NEXT_PAGE               ((uint16_t)0x8000U)
#define LAN8720_ANAR_REMOTE_FAULT            ((uint16_t)0x2000U)
#define LAN8720_ANAR_PAUSE_OPERATION         ((uint16_t)0x0C00U)
#define LAN8720_ANAR_PO_NOPAUSE              ((uint16_t)0x0000U)
#define LAN8720_ANAR_PO_SYMMETRIC_PAUSE      ((uint16_t)0x0400U)
#define LAN8720_ANAR_PO_ASYMMETRIC_PAUSE     ((uint16_t)0x0800U)
#define LAN8720_ANAR_PO_ADVERTISE_SUPPORT    ((uint16_t)0x0C00U)
#define LAN8720_ANAR_100BASE_TX_FD           ((uint16_t)0x0100U)
#define LAN8720_ANAR_100BASE_TX              ((uint16_t)0x0080U)
#define LAN8720_ANAR_10BASE_T_FD             ((uint16_t)0x0040U)
#define LAN8720_ANAR_10BASE_T                ((uint16_t)0x0020U)
#define LAN8720_ANAR_SELECTOR_FIELD          ((uint16_t)0x000FU)
/**
  * @}
  */

/** @defgroup LAN8720_ANLPAR_Bit_Definition LAN8720 ANLPAR Bit Definition
  * @{
  */
#define LAN8720_ANLPAR_NEXT_PAGE            ((uint16_t)0x8000U)
#define LAN8720_ANLPAR_REMOTE_FAULT         ((uint16_t)0x2000U)
#define LAN8720_ANLPAR_PAUSE_OPERATION      ((uint16_t)0x0C00U)
#define LAN8720_ANLPAR_PO_NOPAUSE           ((uint16_t)0x0000U)
#define LAN8720_ANLPAR_PO_SYMMETRIC_PAUSE   ((uint16_t)0x0400U)
#define LAN8720_ANLPAR_PO_ASYMMETRIC_PAUSE  ((uint16_t)0x0800U)
#define LAN8720_ANLPAR_PO_ADVERTISE_SUPPORT ((uint16_t)0x0C00U)
#define LAN8720_ANLPAR_100BASE_TX_FD        ((uint16_t)0x0100U)
#define LAN8720_ANLPAR_100BASE_TX           ((uint16_t)0x0080U)
#define LAN8720_ANLPAR_10BASE_T_FD          ((uint16_t)0x0040U)
#define LAN8720_ANLPAR_10BASE_T             ((uint16_t)0x0020U)
#define LAN8720_ANLPAR_SELECTOR_FIELD       ((uint16_t)0x000FU)
/**
  * @}
  */

/** @defgroup LAN8720_ANER_Bit_Definition LAN8720 ANER Bit Definition
  * @{
  */
#define LAN8720_ANER_RX_NP_LOCATION_ABLE    ((uint16_t)0x0040U)
#define LAN8720_ANER_RX_NP_STORAGE_LOCATION ((uint16_t)0x0020U)
#define LAN8720_ANER_PARALLEL_DETECT_FAULT  ((uint16_t)0x0010U)
#define LAN8720_ANER_LP_NP_ABLE             ((uint16_t)0x0008U)
#define LAN8720_ANER_NP_ABLE                ((uint16_t)0x0004U)
#define LAN8720_ANER_PAGE_RECEIVED          ((uint16_t)0x0002U)
#define LAN8720_ANER_LP_AUTONEG_ABLE        ((uint16_t)0x0001U)
/**
  * @}
  */

/** @defgroup LAN8720_ANNPTR_Bit_Definition LAN8720 ANNPTR Bit Definition
  * @{
  */
#define LAN8720_ANNPTR_NEXT_PAGE         ((uint16_t)0x8000U)
#define LAN8720_ANNPTR_MESSAGE_PAGE      ((uint16_t)0x2000U)
#define LAN8720_ANNPTR_ACK2              ((uint16_t)0x1000U)
#define LAN8720_ANNPTR_TOGGLE            ((uint16_t)0x0800U)
#define LAN8720_ANNPTR_MESSAGGE_CODE     ((uint16_t)0x07FFU)
/**
  * @}
  */

/** @defgroup LAN8720_ANNPRR_Bit_Definition LAN8720 ANNPRR Bit Definition
  * @{
  */
#define LAN8720_ANNPTR_NEXT_PAGE         ((uint16_t)0x8000U)
#define LAN8720_ANNPRR_ACK               ((uint16_t)0x4000U)
#define LAN8720_ANNPRR_MESSAGE_PAGE      ((uint16_t)0x2000U)
#define LAN8720_ANNPRR_ACK2              ((uint16_t)0x1000U)
#define LAN8720_ANNPRR_TOGGLE            ((uint16_t)0x0800U)
#define LAN8720_ANNPRR_MESSAGGE_CODE     ((uint16_t)0x07FFU)
/**
  * @}
  */

/** @defgroup LAN8720_MMDACR_Bit_Definition LAN8720 MMDACR Bit Definition
  * @{
  */
#define LAN8720_MMDACR_MMD_FUNCTION       ((uint16_t)0xC000U) 
#define LAN8720_MMDACR_MMD_FUNCTION_ADDR  ((uint16_t)0x0000U)
#define LAN8720_MMDACR_MMD_FUNCTION_DATA  ((uint16_t)0x4000U)
#define LAN8720_MMDACR_MMD_DEV_ADDR       ((uint16_t)0x001FU)
/**
  * @}
  */

/** @defgroup LAN8720_ENCTR_Bit_Definition LAN8720 ENCTR Bit Definition
  * @{
  */
#define LAN8720_ENCTR_TX_ENABLE             ((uint16_t)0x8000U)
#define LAN8720_ENCTR_TX_TIMER              ((uint16_t)0x6000U)
#define LAN8720_ENCTR_TX_TIMER_1S           ((uint16_t)0x0000U)
#define LAN8720_ENCTR_TX_TIMER_768MS        ((uint16_t)0x2000U)
#define LAN8720_ENCTR_TX_TIMER_512MS        ((uint16_t)0x4000U)
#define LAN8720_ENCTR_TX_TIMER_265MS        ((uint16_t)0x6000U)
#define LAN8720_ENCTR_RX_ENABLE             ((uint16_t)0x1000U)
#define LAN8720_ENCTR_RX_MAX_INTERVAL       ((uint16_t)0x0C00U)
#define LAN8720_ENCTR_RX_MAX_INTERVAL_64MS  ((uint16_t)0x0000U)
#define LAN8720_ENCTR_RX_MAX_INTERVAL_256MS ((uint16_t)0x0400U)
#define LAN8720_ENCTR_RX_MAX_INTERVAL_512MS ((uint16_t)0x0800U)
#define LAN8720_ENCTR_RX_MAX_INTERVAL_1S    ((uint16_t)0x0C00U)
#define LAN8720_ENCTR_EX_CROSS_OVER         ((uint16_t)0x0002U)
#define LAN8720_ENCTR_EX_MANUAL_CROSS_OVER  ((uint16_t)0x0001U)
/**
  * @}
  */

/** @defgroup LAN8720_MCSR_Bit_Definition LAN8720 MCSR Bit Definition
  * @{
  */
#define LAN8720_MCSR_EDPWRDOWN        ((uint16_t)0x2000U)
#define LAN8720_MCSR_FARLOOPBACK      ((uint16_t)0x0200U)
#define LAN8720_MCSR_ALTINT           ((uint16_t)0x0040U)
#define LAN8720_MCSR_ENERGYON         ((uint16_t)0x0002U)
/**
  * @}
  */

/** @defgroup LAN8720_SMR_Bit_Definition LAN8720 SMR Bit Definition
  * @{
  */
#define LAN8720_SMR_MODE       ((uint16_t)0x00E0U)
#define LAN8720_SMR_PHY_ADDR   ((uint16_t)0x001FU)
/**
  * @}
  */

/** @defgroup LAN8720_TPDCR_Bit_Definition LAN8720 TPDCR Bit Definition
  * @{
  */
#define LAN8720_TPDCR_DELAY_IN                 ((uint16_t)0x8000U)
#define LAN8720_TPDCR_LINE_BREAK_COUNTER       ((uint16_t)0x7000U)
#define LAN8720_TPDCR_PATTERN_HIGH             ((uint16_t)0x0FC0U)
#define LAN8720_TPDCR_PATTERN_LOW              ((uint16_t)0x003FU)
/**
  * @}
  */

/** @defgroup LAN8720_TCSR_Bit_Definition LAN8720 TCSR Bit Definition
  * @{
  */
#define LAN8720_TCSR_TDR_ENABLE           ((uint16_t)0x8000U)
#define LAN8720_TCSR_TDR_AD_FILTER_ENABLE ((uint16_t)0x4000U)
#define LAN8720_TCSR_TDR_CH_CABLE_TYPE    ((uint16_t)0x0600U)
#define LAN8720_TCSR_TDR_CH_CABLE_DEFAULT ((uint16_t)0x0000U)
#define LAN8720_TCSR_TDR_CH_CABLE_SHORTED ((uint16_t)0x0200U)
#define LAN8720_TCSR_TDR_CH_CABLE_OPEN    ((uint16_t)0x0400U)
#define LAN8720_TCSR_TDR_CH_CABLE_MATCH   ((uint16_t)0x0600U)
#define LAN8720_TCSR_TDR_CH_STATUS        ((uint16_t)0x0100U)
#define LAN8720_TCSR_TDR_CH_LENGTH        ((uint16_t)0x00FFU)
/**
  * @}
  */

/** @defgroup LAN8720_SCSIR_Bit_Definition LAN8720 SCSIR Bit Definition
  * @{
  */
#define LAN8720_SCSIR_AUTO_MDIX_ENABLE    ((uint16_t)0x8000U)
#define LAN8720_SCSIR_CHANNEL_SELECT      ((uint16_t)0x2000U)
#define LAN8720_SCSIR_SQE_DISABLE         ((uint16_t)0x0800U)
#define LAN8720_SCSIR_XPOLALITY           ((uint16_t)0x0010U)
/**
  * @}
  */

/** @defgroup LAN8720_CLR_Bit_Definition LAN8720 CLR Bit Definition
  * @{
  */
#define LAN8720_CLR_CABLE_LENGTH       ((uint16_t)0xF000U)
/**
  * @}
  */

/** @defgroup LAN8720_IMR_ISFR_Bit_Definition LAN8720 IMR ISFR Bit Definition
  * @{
  */
#define LAN8720_INT_8       ((uint16_t)0x0100U)
#define LAN8720_INT_7       ((uint16_t)0x0080U)
#define LAN8720_INT_6       ((uint16_t)0x0040U)
#define LAN8720_INT_5       ((uint16_t)0x0020U)
#define LAN8720_INT_4       ((uint16_t)0x0010U)
#define LAN8720_INT_3       ((uint16_t)0x0008U)
#define LAN8720_INT_2       ((uint16_t)0x0004U)
#define LAN8720_INT_1       ((uint16_t)0x0002U)
/**
  * @}
  */

/** @defgroup LAN8720_PHYSCSR_Bit_Definition LAN8720 PHYSCSR Bit Definition
  * @{
  */
#define LAN8720_PHYSCSR_AUTONEGO_DONE   ((uint16_t)0x1000U)
#define LAN8720_PHYSCSR_HCDSPEEDMASK    ((uint16_t)0x001CU)
#define LAN8720_PHYSCSR_10BT_HD         ((uint16_t)0x0004U)
#define LAN8720_PHYSCSR_10BT_FD         ((uint16_t)0x0014U)
#define LAN8720_PHYSCSR_100BTX_HD       ((uint16_t)0x0008U)
#define LAN8720_PHYSCSR_100BTX_FD       ((uint16_t)0x0018U) 
/**
  * @}
  */
    
/** @defgroup LAN8720_Status LAN8720 Status
  * @{
  */    

#define  LAN8720_STATUS_READ_ERROR            ((int32_t)-5)
#define  LAN8720_STATUS_WRITE_ERROR           ((int32_t)-4)
#define  LAN8720_STATUS_ADDRESS_ERROR         ((int32_t)-3)
#define  LAN8720_STATUS_RESET_TIMEOUT         ((int32_t)-2)
#define  LAN8720_STATUS_ERROR                 ((int32_t)-1)
#define  LAN8720_STATUS_OK                    ((int32_t) 0)
#define  LAN8720_STATUS_LINK_DOWN             ((int32_t) 1)
#define  LAN8720_STATUS_100MBITS_FULLDUPLEX   ((int32_t) 2)
#define  LAN8720_STATUS_100MBITS_HALFDUPLEX   ((int32_t) 3)
#define  LAN8720_STATUS_10MBITS_FULLDUPLEX    ((int32_t) 4)
#define  LAN8720_STATUS_10MBITS_HALFDUPLEX    ((int32_t) 5)
#define  LAN8720_STATUS_AUTONEGO_NOTDONE      ((int32_t) 6)
/**
  * @}
  */

/** @defgroup LAN8720_IT_Flags LAN8720 IT Flags
  * @{
  */     
#define  LAN8720_WOL_IT                        LAN8720_INT_8
#define  LAN8720_ENERGYON_IT                   LAN8720_INT_7
#define  LAN8720_AUTONEGO_COMPLETE_IT          LAN8720_INT_6
#define  LAN8720_REMOTE_FAULT_IT               LAN8720_INT_5
#define  LAN8720_LINK_DOWN_IT                  LAN8720_INT_4
#define  LAN8720_AUTONEGO_LP_ACK_IT            LAN8720_INT_3
#define  LAN8720_PARALLEL_DETECTION_FAULT_IT   LAN8720_INT_2
#define  LAN8720_AUTONEGO_PAGE_RECEIVED_IT     LAN8720_INT_1
/**
  * @}
  */

/**
  * @}
  */

/* Exported types ------------------------------------------------------------*/ 
/** @defgroup LAN8720_Exported_Types LAN8720 Exported Types
  * @{
  */
typedef int32_t  (*lan8720_Init_Func) (void); 
typedef int32_t  (*lan8720_DeInit_Func) (void);
typedef int32_t  (*lan8720_ReadReg_Func)   (uint32_t, uint32_t, uint32_t *);
typedef int32_t  (*lan8720_WriteReg_Func)  (uint32_t, uint32_t, uint32_t);
typedef int32_t  (*lan8720_GetTick_Func)  (void);

typedef struct 
{                   
  lan8720_Init_Func      Init; 
  lan8720_DeInit_Func    DeInit;
  lan8720_WriteReg_Func  WriteReg;
  lan8720_ReadReg_Func   ReadReg; 
  lan8720_GetTick_Func   GetTick;   
} lan8720_IOCtx_t;  

  
typedef struct 
{
  uint32_t            DevAddr;
  uint32_t            Is_Initialized;
  lan8720_IOCtx_t     IO;
  void               *pData;
}lan8720_Object_t;
/**
  * @}
  */ 

/* Exported macro ------------------------------------------------------------*/
/* Exported functions --------------------------------------------------------*/
/** @defgroup LAN8720_Exported_Functions LAN8720 Exported Functions
  * @{
  */
int32_t LAN8720_RegisterBusIO(lan8720_Object_t *pObj, lan8720_IOCtx_t *ioctx);
int32_t LAN8720_Init(lan8720_Object_t *pObj);
int32_t LAN8720_DeInit(lan8720_Object_t *pObj);
int32_t LAN8720_DisablePowerDownMode(lan8720_Object_t *pObj);
int32_t LAN8720_EnablePowerDownMode(lan8720_Object_t *pObj);
int32_t LAN8720_StartAutoNego(lan8720_Object_t *pObj);
int32_t LAN8720_GetLinkState(lan8720_Object_t *pObj);
int32_t LAN8720_SetLinkState(lan8720_Object_t *pObj, uint32_t LinkState);
int32_t LAN8720_EnableLoopbackMode(lan8720_Object_t *pObj);
int32_t LAN8720_DisableLoopbackMode(lan8720_Object_t *pObj);
int32_t LAN8720_EnableIT(lan8720_Object_t *pObj, uint32_t Interrupt);
int32_t LAN8720_DisableIT(lan8720_Object_t *pObj, uint32_t Interrupt);
int32_t LAN8720_ClearIT(lan8720_Object_t *pObj, uint32_t Interrupt);
int32_t LAN8720_GetITStatus(lan8720_Object_t *pObj, uint32_t Interrupt);
/**
  * @}
  */ 

#ifdef __cplusplus
}
#endif
#endif /* LAN8720_H */


/**
  * @}
  */ 

/**
  * @}
  */

/**
  * @}
  */ 

/**
  * @}
  */

PHY 接口测试

前面分别实现了 PHY 的读写接口，以及 LAN8720 相关的接口，这里简单测试一下，LAN8720 寄存器的读写功能

/* USER CODE BEGIN 0 */
static void print_binary(int value, int bits)
{
  for (int i = bits - 1; i >= 0; i--)
  {
    printf("%d", (value >> i) & 1);
  }
  printf("b\r\n");
}

static void MY_PHY_LAN8720_INIT(void)
{
  /* Set PHY IO functions */
  LAN8720_RegisterBusIO(&LAN8720, &LAN8720_IOCtx);

  /* Initialize the LAN8742 ETH PHY */
  if(LAN8720_Init(&LAN8720) != LAN8720_STATUS_OK)
  {
    printf("init lan8720 error\r\n");
    while(1);
  }

  printf("my phy addr = %d\r\n", LAN8720.DevAddr);

  uint32_t readval = 0;
  if(LAN8720_IOCtx.ReadReg(LAN8720.DevAddr, LAN8720_PHYI1R, &readval) < 0)
  {
    printf("read lan8720 error\r\n");
    while(1);
  }
  printf("LAN8720_PHYI1R PHY ID Number = %d\r\n", readval);

  readval = 0;
  if(LAN8720_IOCtx.ReadReg(LAN8720.DevAddr, LAN8720_PHYI2R, &readval) < 0)
  {
    printf("read lan8720 error\r\n");
    while(1);
  }

  uint32_t bits_15_10 = (readval >> 10) & 0x3F; // 提取 bit15:10
  printf("LAN8720_PHYI2R PHY ID Number = ");
  print_binary(bits_15_10, 6); // bit15:10 共 6 位

  uint32_t bits_9_4 = (readval >> 4) & 0x3F; // 提取 bit9:4 (6 位)
  printf("LAN8720_PHYI2R Model Number  = ");
  print_binary(bits_9_4, 6); // bit15:10 共 6 位


  readval = 0;
  if(LAN8720_IOCtx.ReadReg(LAN8720.DevAddr, LAN8720_BCR, &readval) < 0)
  {
    printf("read lan8720 error\r\n");
    while(1);
  }
  printf("before write: %d\r\n", readval);

  readval |= LAN8720_BCR_LOOPBACK;
  if(LAN8720_IOCtx.WriteReg(LAN8720.DevAddr, LAN8720_BCR, readval) < 0)
  {
    printf("write lan8720 error\r\n");
    while(1);
  }

  readval = 0;
  if(LAN8720_IOCtx.ReadReg(LAN8720.DevAddr, LAN8720_BCR, &readval) < 0)
  {
    printf("read lan8720 error\r\n");
    while(1);
  }
  printf("after bit14 set = ");
  print_binary(readval, 16); // 共 16 位
}
/* USER CODE END 0 */

  /* USER CODE BEGIN 2 */
  MY_PHY_LAN8720_INIT();

  printf("this is eht example\r\n");

  /* USER CODE END 2 */
  • 代码中先读取了 PHY 的地址
  • 读取 LAN8720_PHYI1R 寄存器获取 PHY ID Number
  • 读取 LAN8720_PHYI2R 寄存器获取 PHY ID Number 和 Model Number
  • 最后对 LAN8720_BCR 的 bit14 进行了读写

部分地址的描述如下
在这里插入图片描述

在这里插入图片描述
在这里插入图片描述

效果如下

my phy addr = 0
PHY ID Number = 110000b
Model Number  = 001111b
before write: 0
after bit14 set = 0100000000000000b
this is eht example

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