我用 STM32CubeMX 生成了工程，板子上的以太网通信在网线预先插好的情况下可以正常工作。
但存在一个问题：只有在开机时网线已经接好，以太网才能正常工作。如果板子上电时没有插网线，以太网就无法正常工作，即便之后再插上网线也始终无法恢复。
为了解决这个问题，我在 LWIP 初始化完成后添加了如下函数：
netif_set_link_callback(&gnetif, ethernetif_update_config);
其中`ethernetif_update_config`函数是 CubeMX 自动生成的，作用是重启以太网自动协商。
void
ethernetif_update_config(
struct
netif *netif)
{
__IO uint32_t tickstart = 0;
uint32_t regvalue = 0;
if
(netif_is_link_up(netif))
{
/* Restart the auto-negotiation */
if
(heth.Init.AutoNegotiation != ETH_AUTONEGOTIATION_DISABLE)
{
/* Enable Auto-Negotiation */
HAL_ETH_WritePHYRegister(&heth, PHY_BCR, PHY_AUTONEGOTIATION);
/* Get tick */
tickstart = HAL_GetTick();
/* Wait until the auto-negotiation will be completed */
do
{
HAL_ETH_ReadPHYRegister(&heth, PHY_BSR, ®value);
/* Check for the Timeout ( 1s ) */
if
((HAL_GetTick() - tickstart ) > 1000)
{
/* In case of timeout */
goto
error;
}
}
while
(((regvalue & PHY_AUTONEGO_COMPLETE) != PHY_AUTONEGO_COMPLETE));
/* Read the result of the auto-negotiation */
HAL_ETH_ReadPHYRegister(&heth, PHY_SR, ®value);
/* Configure the MAC with the Duplex Mode fixed by the auto-negotiation process */
if
((regvalue & PHY_DUPLEX_STATUS) != (uint32_t)RESET)
{
/* Set Ethernet duplex mode to Full-duplex following the auto-negotiation */
heth.Init.DuplexMode = ETH_MODE_FULLDUPLEX;
}
else
{
/* Set Ethernet duplex mode to Half-duplex following the auto-negotiation */
heth.Init.DuplexMode = ETH_MODE_HALFDUPLEX;
}
/* Configure the MAC with the speed fixed by the auto-negotiation process */
if
(regvalue & PHY_SPEED_STATUS)
{
/* Set Ethernet speed to 10M following the auto-negotiation */
heth.Init.Speed = ETH_SPEED_10M;
}
else
{
/* Set Ethernet speed to 100M following the auto-negotiation */
heth.Init.Speed = ETH_SPEED_100M;
}
}
else
/* AutoNegotiation Disable */
{
error :
/* Check parameters */
assert_param(IS_ETH_SPEED(heth.Init.Speed));
assert_param(IS_ETH_DUPLEX_MODE(heth.Init.DuplexMode));
/* Set MAC Speed and Duplex Mode to PHY */
HAL_ETH_WritePHYRegister(&heth, PHY_BCR, ((uint16_t)(heth.Init.DuplexMode >> 3) |
(uint16_t)(heth.Init.Speed >> 1)));
}
/* ETHERNET MAC Re-Configuration */
HAL_ETH_ConfigMAC(&heth, (ETH_MACInitTypeDef *) NULL);
/* Restart MAC interface */
HAL_ETH_Start(&heth);
}
else
{
/* Stop MAC interface */
HAL_ETH_Stop(&heth);
}
ethernetif_notify_conn_changed(netif);
}
我在插上网线后通过调用`netif_set_link_up(&gnetif)`手动触发该回调函数时，以太网依旧无法正常工作。有没有人知道在这种场景下该如何让以太网正常运行？
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