也说STM32F207+DP83848+RT-T2.1.0实现网线拔插重连

发布于 2018-11-16 11:41:27 浏览：2953 订阅该版

之前用了RTT1.0.0到实际产品，中途荒废了一段时间，最近公司产品更新换代使用RTT2.1.0。
这个算是个小小问题的总结贴：

**STM32F207+DP83848+RT-THREAD2.1.0实现网线拔插重连效果**

1、首先感谢CSDN网友bobbat的文章，
[https://blog.csdn.net/bobbat/article/details/42876151?locationNum=2](https://blog.csdn.net/bobbat/article/details/42876151?locationNum=2)
STM32F207+DP83848+RT-THREAD实现网线拔插重连试验 - 留马人 - CSDN博客.html

2、3-1.具体修改地方:
3-1-1.针对stm32f2x7_eth_conf.h文件需要添加如下代码:[D: t-thread-2.1.0\bsp\stm32f20x-201811151731\Libraries\STM32F2x7_ETH_Driver\inc\stm32f2x7_eth_conf.h];
//add by Rn 20181114
#define PHY_MICR_INT_EN							((uint16_t)0x0002) /*!< PHY Enable interrupts	*/
#define PHY_MICR_INT_OE							((uint16_t)0x0001) /*!< PHY Enable output interrupt events	*/

#define PHY_MISR_LINK_INT_EN				((uint16_t)0x0020) /*!< Enable Interrupt on change of link status	*/
#define PHY_LINK_INTERRUPT					((uint16_t)0x2000) /*!< PHY link status interrupt mask	*/

#define PHY_LINK_STATUS							((uint16_t)0x0020)	/*!<?PHY Link mask */
//-----------------------
3-1-2.针对stm32f2_eth.c文件修改添加如下代码:[D: t-thread-2.1.0\bsp\stm32f20x-201811151731\Drivers\stm32f2_eth.c];
在ETH_MACDMA_Config()函数中最后一条语句"ETH_DMAITConfig(ETH_DMA_IT_NIS | ETH_DMA_IT_R , ENABLE);"之前增加如下语句:
	//add by Rn 20181114
	/* Configure the PHY to generate an interrupt on change of link status */
	if( Eth_Link_PHYITConfig(DP83848_PHY_ADDRESS) == ETH_SUCCESS )
	{
		rt_kprintf(" Eth_Link_PHYITConfig():Set_OK. ");
	}else
	{
		rt_kprintf(" Eth_Link_PHYITConfig():Error!!!. ");
	}
	/* Configure the EXTI for Ethernet link status. */
	rt_kprintf("Configure the EXTI for Ethernet link status. ");
	Eth_Link_EXTIConfig();
	//--------------------

3-1-3.针对stm32f2_eth.c文件需要添加如下代码:
//add by Rn 20181114
/************************************************************
**配置DP83848芯片当网线状态变化时产生一个变化电平通知MCU。
*************************************************************/
uint32_t Eth_Link_PHYITConfig(uint16_t PHYAddress)
{
/* PHY registers */
  uint32_t tmpreg = 0;
  tmpreg = ETH_ReadPHYRegister(PHYAddress, 2);
  tmpreg = ETH_ReadPHYRegister(PHYAddress, 3);
  /* Read MICR register */
  tmpreg = ETH_ReadPHYRegister(PHYAddress, PHY_MICR);
  /* Enable output interrupt events to signal via the INT pin */
  tmpreg |= (uint32_t)PHY_MICR_INT_EN | PHY_MICR_INT_OE;
  if(!(ETH_WritePHYRegister(PHYAddress, PHY_MICR, tmpreg)))
  {
    /* Return ERROR in case of write timeout */
    return ETH_ERROR;
  }
  /* Read MISR register */
  tmpreg = ETH_ReadPHYRegister(PHYAddress, PHY_MISR);
  /* Enable Interrupt on change of link status */
  tmpreg |= (uint32_t)PHY_MISR_LINK_INT_EN;
  if(!(ETH_WritePHYRegister(PHYAddress, PHY_MISR, tmpreg)))
  {
    /* Return ERROR in case of write timeout */
    return ETH_ERROR;
  }
  /* Return SUCCESS */
  return ETH_SUCCESS;
}

/***********************************************************
***配置GPIOA3为下降沿触发中断，通知MCU网线连接状态变化。(先使用的是网页原版写法)
***配置GPIOB7为下降沿触发中断，通知MCU网线连接状态变化。(Power_Box_STM,还未做相应修改)
************************************************************/
#define ETH_LINK_GPIO_PORT					GPIOB
#define ETH_LINK_GPIO_PIN						GPIO_Pin_7
#define ETH_LINK_GPIO_CLK						RCC_AHB1Periph_GPIOB
#define	ETH_LINK_EXTI_PORT_SOURCE		EXTI_PortSourceGPIOB
#define	ETH_LINK_EXTI_PIN_SOURCE		EXTI_PinSource7
#define	ETH_LINK_EXTI_LINE					EXTI_Line7

void Eth_Link_EXTIConfig(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  EXTI_InitTypeDef EXTI_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

/* Enable the INT (PB7) Clock */
  RCC_AHB1PeriphClockCmd(ETH_LINK_GPIO_CLK, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//打开要使用的外设时钟

/* Configure INT pin as input */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStructure.GPIO_Pin = ETH_LINK_GPIO_PIN;
  GPIO_Init(ETH_LINK_GPIO_PORT, &GPIO_InitStructure);

/* Connect EXTI Line to INT Pin 完成GPIO和外部中断的映射[配置PB7为中断输入源,需启用SYSCFG时钟] */
  SYSCFG_EXTILineConfig(ETH_LINK_EXTI_PORT_SOURCE, ETH_LINK_EXTI_PIN_SOURCE);

/* Configure EXTI line */
  EXTI_InitStructure.EXTI_Line = ETH_LINK_EXTI_LINE;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;  
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

/* Enable and set the EXTI interrupt to the highest priority;NVIC_PriorityGroup_2:代表有4个抢占优先级,4个响应优先级;即NVIC_IRQChannelPreemptionPriority可以为0~3,NVIC_IRQChannelSubPriority可以赋值为0~3 */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);  
  NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

static rt_err_t rt_stm32_eth_init(rt_device_t dev);

//初始化MAC和DMA相关参数
void init_dma_mac(void)
{
    rt_device_t stm32_eth_device;
    ETH_MACDMA_Config();
    stm32_eth_device = rt_device_find("e0");
    rt_stm32_eth_init(stm32_eth_device);
}

/**********************************************
**当网线连接状态判断是出于连接状态还是拔开状态，
**若为连接状态就根据实际情况重新配置MAC和DMA。
**********************************************/
void Eth_Link_ITHandler(uint16_t PHYAddress)
{
	/* Check whether the link interrupt has occurred or not */
	if(((ETH_ReadPHYRegister(PHYAddress, PHY_MISR)) & PHY_LINK_STATUS) != 0)
	{
		uint16_t status = ETH_ReadPHYRegister(PHYAddress, PHY_BSR);
		
		if(status & (PHY_AutoNego_Complete | PHY_Linked_Status)){
			init_dma_mac();//初始化MAC和DMA相关参数
			rt_kprintf("Net_Link is Connected. ");
		}else{
			rt_kprintf("Net_Link is Not established,Network break off！！！ ");
		}
	}
}

/*************************************************
**MCU外部中断入口函数，当STM32相应管教检测到下降沿
**变化则就会进入此中断函数。
*************************************************/
void EXTI9_5_IRQHandler(void)
{
	//EXTI_GetITStatus检查指定外部中断线的状态是否有效
  if(EXTI_GetITStatus(ETH_LINK_EXTI_LINE) != RESET)
  {
    Eth_Link_ITHandler(DP83848_PHY_ADDRESS);
    /* Clear interrupt pending bit */
    EXTI_ClearITPendingBit(ETH_LINK_EXTI_LINE);
  }
}
//-----------------------------------------end of add by Rn 20181114

3、我的硬件设备情况：
DP83848网卡7引脚PWR_DOWN<--->STM32F207芯片PB7;
最方便的方法是:
把附件提到的stm32f2x7_eth_conf.h和stm32f2_eth.c文件覆盖到对应项目录重新编译下即可。

下载附件 [stm32f2_eth.c](https://oss-club.rt-thread.org/uploads/201811/16/114100wt7j5c56jsa7sze6.attach)

下载附件 [stm32f2x7_eth_conf.h](https://oss-club.rt-thread.org/uploads/201811/16/114100z24x9z4vloggpoco.attach)