RTT-Studio+STM32F407VET6+DP83848KSQ/NOPB PHY芯片+LWIP需要复位吗？

发布于 2023-07-26 16:19:00 浏览：613 订阅该版

使用DP83848KSQ/NOPB PHY芯片+LWIP实现网络功能，ETH初始化的时候会调用phy_reset函数，我想问下phy芯片初始化时必须要复位吗？我的原理图上复位引脚直接接到Main_REST上了，这样还需要复位吗？
具体实现步骤如下：
board.h文件内打开对应的宏
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230726/43b075ff271fff9aacfae9d5b7a66a04.png)
stm32f4xx_hal_conf.h文件内打开HAL_ETH_MODULE_ENABLED定义
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230726/b1fef6e53b0ea57b93259f57bf5d6d67.png)
原理图上ETH引脚如下：
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230726/053b03021291746dc34c86e05f68988b.png)
另外新建ioc文件，使用CubeMX生成HAL_ETH_MspInit函数如下：

```c
/**
* @brief ETH MSP Initialization
* This function configures the hardware resources used in this example
* @param heth: ETH handle pointer
* @retval None
*/
void HAL_ETH_MspInit(ETH_HandleTypeDef* heth)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(heth->Instance==ETH)
  {
  /* USER CODE BEGIN ETH_MspInit 0 */

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

__HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOB_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
    PB12     ------> ETH_TXD0
    PB13     ------> 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_PIN_12|GPIO_PIN_13;
    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);

/* USER CODE BEGIN ETH_MspInit 1 */

/* USER CODE END ETH_MspInit 1 */
  }

}
```
将HAL_ETH_MspInit函数复制粘贴到drv_eth.c文件末尾
找到rt-thread文件内的phy.h文件，注释掉#define PHY_FULL_DUPLEX 1U，不然报错，并且引用当前路径为构建配置，看了教程复位时要使用pin.h文件。
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230726/351e0c0206b23687900d17fd90a315ec.png.webp)
ETH初始化时，会调用phy_reset函数复位phy芯片
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230726/0a63f466e3f4418431421a94613dc36e.png)
之前看了一篇教程，用的是LAN8720A的phy芯片，我有个疑惑是这个芯片的配置步骤和DP83848KSQ/NOPB是一样的吗？看到例程上是使用一个GPIO来复位phy芯片如下，但是我的原理图上直接接到主复位键上了，这一步我该怎么实现呢？
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230726/c58cf12c92776aa045f0727144f7d9f0.png.webp)

我这里把phy_reset函数做了空实现

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230726/dbc9c4bb5cf09b8187569c56c53be434.png)

然后打开RT-Thread Settings，打开ETH设备驱动
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230726/2c5b7269e8fa6af0d57253928714b8c1.png.webp)
打开网络，使能套接字抽象层，使能Lwip堆栈
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230726/2eb8cdb5b0da4edd5874057c77d3259f.png.webp)
我这里没有使用路由器，取消DHCP，设置了一个静态IP(192.168.1.10)，我是用单片机网线直连的电脑，电脑IP为192.168.1.80
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230726/88e9a5314af8cf91caf09a5fb63ffcb0.png.webp)
编译后下载到开发板，控制台提示如下：

```c
 \ | /
- RT -     Thread Operating System
 / | \     4.1.1 build Jul 26 2023 16:17:01
 2006 - 2022 Copyright by RT-Thread team
lwIP-2.0.3 initialized!
[31m[E/drv.emac] eth hardware init failed[0m
[32m[I/sal.skt] Socket Abstraction Layer initialize success.[0m
msh >ifconfig
network interface device: e0 (Default)
MTU: 1500
MAC: 00 80 e1 02 4b 44 
FLAGS: UP LINK_DOWN INTERNET_DOWN DHCP_DISABLE ETHARP BROADCAST IGMP
ip address: 192.168.1.10
gw address: 192.168.1.1
net mask  : 255.255.255.0
dns server #0: 0.0.0.0
dns server #1: 0.0.0.0
msh >
msh >ping 192.168.1.80
ping: not found available network interface device.
msh >
msh >
```
可以看到eth hardware init failed初始化失败了，我想问下是否和那个复位引脚有关呢？