这个钩子函数是什么什么意思？

发布于 2025-05-07 21:00:04 浏览：114 订阅该版

2 个回答

oxlm 22小时前

这家伙很懒，什么也没写！

天涯cccc 打赏了 50.00 元 2025-05-08 09:14:10

天涯cccc 11小时前

这家伙很懒，什么也没写！

```c
void rt_object_init(struct rt_object         *object,
                    enum rt_object_class_type type,
                    const char               *name)
{
    register rt_base_t temp;
    struct rt_list_node *node = RT_NULL;
    struct rt_object_information *information;
#ifdef RT_USING_MODULE
    struct rt_dlmodule *module = dlmodule_self();
#endif /* RT_USING_MODULE */

/* get object information */
    information = rt_object_get_information(type);
    RT_ASSERT(information != RT_NULL);

/* check object type to avoid re-initialization */

/* enter critical */
    rt_enter_critical();
    /* try to find object */
    for (node  = information->object_list.next;
            node != &(information->object_list);
            node  = node->next)
    {
        struct rt_object *obj;

obj = rt_list_entry(node, struct rt_object, list);
        if (obj) /* skip warning when disable debug */
        {
            RT_ASSERT(obj != object);
        }
    }
    /* leave critical */
    rt_exit_critical();

/* initialize object's parameters */
    /* set object type to static */
    object->type = type | RT_Object_Class_Static;
    /* copy name */
    rt_strncpy(object->name, name, RT_NAME_MAX);

RT_OBJECT_HOOK_CALL(rt_object_attach_hook, (object));

/* lock interrupt */
    temp = rt_hw_interrupt_disable();

#ifdef RT_USING_MODULE
    if (module)
    {
        rt_list_insert_after(&(module->object_list), &(object->list));
        object->module_id = (void *)module;
    }
    else
#endif /* RT_USING_MODULE */
    {
        /* insert object into information object list */
        rt_list_insert_after(&(information->object_list), &(object->list));
    }

/* unlock interrupt */
    rt_hw_interrupt_enable(temp);
}
```

这个代码的作用是初始化对象，我的疑问是运行rt_object_attach_hook(object)怎么就调用了下面的设备对象里面的初始化函数：

```c
struct rt_device
{
    struct rt_object          parent;                   /**< inherit from rt_object */

enum rt_device_class_type type;                     /**< device type */
    rt_uint16_t               flag;                     /**< device flag */
    rt_uint16_t               open_flag;                /**< device open flag */

rt_uint8_t                ref_count;                /**< reference count */
    rt_uint8_t                device_id;                /**< 0 - 255 */

/* device call back */
    rt_err_t (*rx_indicate)(rt_device_t dev, rt_size_t size);
    rt_err_t (*tx_complete)(rt_device_t dev, void *buffer);

#ifdef RT_USING_DEVICE_OPS
    const struct rt_device_ops *ops;
#else
    /* common device interface */
    rt_err_t  (*init)   (rt_device_t dev);
    rt_err_t  (*open)   (rt_device_t dev, rt_uint16_t oflag);
    rt_err_t  (*close)  (rt_device_t dev);
    rt_size_t (*read)   (rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size);
    rt_size_t (*write)  (rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size);
    rt_err_t  (*control)(rt_device_t dev, int cmd, void *args);
#endif
```

rt_err_t  (*init)   (rt_device_t dev);

虽然这个是系统的函数，不需要更改，但还是想搞明白。

oxlm 10小时前

这家伙很懒，什么也没写！

oxlm 10小时前

这家伙很懒，什么也没写！

天涯cccc 9小时前

这家伙很懒，什么也没写！

我这边想找到给以太网中断打开的调用：
```c
static int rt_hw_ch32_eth_init(void)
{
    rt_err_t state = RT_EOK;
    /* 84-c2-e4 WCH. */
    ch32v30x_eth_device.dev_addr[0] = 0x84;
    ch32v30x_eth_device.dev_addr[1] = 0xc2;
    ch32v30x_eth_device.dev_addr[2] = 0xe4;
    /* generate MAC (only for test). */
    ch32v30x_eth_device.dev_addr[3] = 0x1;
    ch32v30x_eth_device.dev_addr[4] = 0x2;
    ch32v30x_eth_device.dev_addr[5] = 0x3;

ch32v30x_eth_device.parent.parent.init       = rt_ch32_eth_init;
    ch32v30x_eth_device.parent.parent.open       = rt_ch32_eth_open;
    ch32v30x_eth_device.parent.parent.close      = rt_ch32_eth_close;
    ch32v30x_eth_device.parent.parent.read       = rt_ch32_eth_read;
    ch32v30x_eth_device.parent.parent.write      = rt_ch32_eth_write;
    ch32v30x_eth_device.parent.parent.control    = rt_ch32_eth_control;
    ch32v30x_eth_device.parent.parent.user_data  = RT_NULL;

ch32v30x_eth_device.parent.eth_rx     = rt_ch32_eth_rx;
    ch32v30x_eth_device.parent.eth_tx     = rt_ch32_eth_tx;

/* register eth device */
    state = eth_device_init(&(ch32v30x_eth_device.parent), "e0");
    if (RT_EOK == state)
    {
        LOG_D("emac device init success");
    }
    else
    {
        LOG_E("emac device init faild: %d\r\n", state);
        state = -RT_ERROR;
    }

return state;
}
INIT_DEVICE_EXPORT(rt_hw_ch32_eth_init);
```
我只找到这个指针的赋值，但是没有调用：  
ch32v30x_eth_device.parent.parent.init       = rt_ch32_eth_init;，
在这个函数里面对以太网中断进行了设置：

```c
static rt_err_t rt_ch32_eth_init(rt_device_t dev)
{
    ETH_InitTypeDef ETH_InitStructure={0};
    RCC_PLL3Cmd(DISABLE);
    RCC_PREDIV2Config(RCC_PREDIV2_Div2);
    RCC_PLL3Config(RCC_PLL3Mul_15);
    RCC_PLL3Cmd(ENABLE);
    while(RESET == RCC_GetFlagStatus(RCC_FLAG_PLL3RDY));
    LOG_D("PLL3 Init Finish\r\n");
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ETH_MAC|RCC_AHBPeriph_ETH_MAC_Tx|RCC_AHBPeriph_ETH_MAC_Rx,ENABLE);
#ifdef USE10BASE_T
    /* Enable internal 10BASE-T PHY*/
    EXTEN->EXTEN_CTR |=EXTEN_ETH_10M_EN;
#endif
#ifdef USE_GIGA_MAC
    /* Enable 1G MAC*/
    EXTEN->EXTEN_CTR |= EXTEN_ETH_RGMII_SEL;
    /* mac clock use external 125MHz,input from PB1 */
    RCC_ETH1GCLKConfig(RCC_ETH1GCLKSource_PB1_IN);
    RCC_ETH1G_125Mcmd(ENABLE);
    /*  Enable RGMII GPIO */
    GETH_pin_init();
#endif

#ifdef USE_FAST_MAC
    /*  Enable MII or RMII GPIO */
    FETH_pin_init();
#endif
    /* Reset ETHERNET on AHB Bus */
    ETH_DeInit();
    /* Software reset */
    ETH_SoftwareReset();
    /* Wait for software reset */
    while(ETH->DMABMR & ETH_DMABMR_SR);
    LOG_D("ETH RST Finish\r\n");

ETH_StructInit(Ð_InitStructure);
    ETH_InitStructure.ETH_Mode = ETH_Mode_FullDuplex;
    ETH_InitStructure.ETH_Speed = ETH_Speed_1000M;
    ETH_InitStructure.ETH_AutoNegotiation = ETH_AutoNegotiation_Enable  ;
    ETH_InitStructure.ETH_LoopbackMode = ETH_LoopbackMode_Disable;
    ETH_InitStructure.ETH_RetryTransmission = ETH_RetryTransmission_Disable;
    ETH_InitStructure.ETH_AutomaticPadCRCStrip = ETH_AutomaticPadCRCStrip_Disable;
    ETH_InitStructure.ETH_ReceiveAll = ETH_ReceiveAll_Enable;
    ETH_InitStructure.ETH_BroadcastFramesReception = ETH_BroadcastFramesReception_Enable;
    ETH_InitStructure.ETH_PromiscuousMode = ETH_PromiscuousMode_Enable;
    ETH_InitStructure.ETH_MulticastFramesFilter = ETH_MulticastFramesFilter_Perfect;
    ETH_InitStructure.ETH_UnicastFramesFilter = ETH_UnicastFramesFilter_Perfect;
#ifdef CHECKSUM_BY_HARDWARE
	ETH_InitStructure.ETH_ChecksumOffload = ETH_ChecksumOffload_Enable;
#endif
	/*------------------------   DMA   -----------------------------------*/
	/* When we use the Checksum offload feature, we need to enable the Store and Forward mode:
	the store and forward guarantee that a whole frame is stored in the FIFO, so the MAC can insert/verify the checksum,
	if the checksum is OK the DMA can handle the frame otherwise the frame is dropped */
	ETH_InitStructure.ETH_DropTCPIPChecksumErrorFrame = ETH_DropTCPIPChecksumErrorFrame_Enable;
	ETH_InitStructure.ETH_ReceiveStoreForward = ETH_ReceiveStoreForward_Enable;
	ETH_InitStructure.ETH_TransmitStoreForward = ETH_TransmitStoreForward_Enable;
	ETH_InitStructure.ETH_ForwardErrorFrames = ETH_ForwardErrorFrames_Enable;
	ETH_InitStructure.ETH_ForwardUndersizedGoodFrames = ETH_ForwardUndersizedGoodFrames_Enable;
	ETH_InitStructure.ETH_SecondFrameOperate = ETH_SecondFrameOperate_Disable;
	ETH_InitStructure.ETH_AddressAlignedBeats = ETH_AddressAlignedBeats_Enable;
	ETH_InitStructure.ETH_FixedBurst = ETH_FixedBurst_Enable;
	ETH_InitStructure.ETH_RxDMABurstLength = ETH_RxDMABurstLength_32Beat;
	ETH_InitStructure.ETH_TxDMABurstLength = ETH_TxDMABurstLength_32Beat;
	ETH_InitStructure.ETH_DMAArbitration = ETH_DMAArbitration_RoundRobin_RxTx_2_1;
	/* Configure Ethernet */
	ETH_Init(Ð_InitStructure, PHY_ADDRESS);
	/* Enable the Ethernet Rx Interrupt */
	ETH_DMAITConfig(ETH_DMA_IT_NIS
					| ETH_DMA_IT_R
					| ETH_DMA_IT_T
					,ENABLE);
	NVIC_SetPriority(ETH_IRQn,1<<4);
	NVIC_EnableIRQ(ETH_IRQn);
	ETH_DMATxDescChainInit(DMATxDscrTab, &Tx_Buff[0][0], ETH_TXBUFNB);
	ETH_DMARxDescChainInit(DMARxDscrTab, &Rx_Buff[0][0], ETH_RXBUFNB);
#ifdef USE_GIGA_MAC
	RGMII_TXC_Delay(0,2);   
#endif
	ETH_Start();
	return RT_EOK;
}
```
	NVIC_SetPriority(ETH_IRQn,1<<4);
	NVIC_EnableIRQ(ETH_IRQn);
目前找不到怎么调用这个函数的：
rt_ch32_eth_init;，