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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

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

但是当 CubeMx 使能 ETH 外设的 RMII 时候，默认使用的引脚是 PB12 和 PB13

这里需要手动修改

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 ConfigurationPC1     ------> ETH_MDCPA1     ------> ETH_REF_CLKPA2     ------> ETH_MDIOPA7     ------> ETH_CRS_DVPC4     ------> ETH_RXD0PC5     ------> ETH_RXD1PB11     ------> ETH_TX_ENPG13     ------> ETH_TXD0PG14     ------> 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 donein 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 addresscontinue 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 __cplusplusextern "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 bit15:10printf("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

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