RT-Thread中Lan8720和lwip协议栈的使用-电子发烧友网

开发环境：野火的stm32f407，rt-thread studio版本是版本: 2.2.6，stm32f4的资源包为0.2.2，Agile Modbus软件包版本为v1.1.2。新建选择芯片工程。

修改工程使用外部晶振，可参考第一篇文章 rt-thread studio新建stm32f407工程。

查看野火工程的资料，可知道芯片的使用引脚为：

PG11 : RMII_TX_EN；
PG13 : RMII_TXD0；
PG14 : RMII_TXD1；
PC5 : RMII_RXD1；
PC4 : RMII_RXD0；
PA7 : RMII_CRSDV；
PA1 : RMII_REF_CLK；
PC1 : RMII_MDC；
PA2 : RMII_MDIO；
复位脚：NRST脚。

接线方式: 笔记本连接路由器，野火开发板也连接路由器。
根据文档需要做的步骤如下：

/*if you want to use eth you can use the following instructions.
*

STEP 1, define macro related to the eth
```
such as    BSP_USING_ETH
```
STEP 2, copy your eth init function from stm32xxxx_hal_msp.c generated by stm32cubemx to the end if board.c file

such as     void HAL_ETH_MspInit(ETH_HandleTypeDef* heth)

STEP 3, modify your stm32xxxx_hal_config.h file to support eth peripherals. define macro related to the peripherals

such as     #define HAL_ETH_MODULE_ENABLED

STEP 4, config your phy type
```
such as     #define PHY_USING_LAN8720A
```
```
#define PHY_USING_DM9161CEP
```
```
#define PHY_USING_DP83848C
```
STEP 5, implement your phy reset function in the end of board.c file
```
void phy_reset(void)
```

STEP 6, config your lwip or other network stack
*/
按照要求修改即可，主要讲STEP2和STEP6的修改。STEP2 中的代码使用cubmx生成，生成的代码如下：

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_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
PG11 ------> 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_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 */
}
}