在看GD32H7xx的usb官方demo（GD32H7xx_Firmware_Library_V1.4.0\Examples\USBHS\usb_host\usb_host_hid_keyboard_mouse），发现个问题，想请教各位大佬，以下是代码
<app.c>主进程入口
usbh_host usb_host_hid;
usb_core_driver hid_host_core;
int main(void)
{
usb_core_driver *idev = (usb_core_driver *)usb_host_hid.data;
cache_enable();
#ifdef USE_ULPI_PHY
usb_gpio_config();
#endif /* USE_ULPI_PHY */
usb_rcu_config();
usb_timer_init();
/* configure GPIO pin used for switching VBUS power and charge pump I/O */
usb_vbus_config();
/* register device class */
usbh_class_register(&usb_host_hid, &usbh_hid);
#ifdef USE_USBHS0
#ifdef USE_USB_FS
usb_para_init(&hid_host_core, USBHS0, USB_SPEED_FULL);
#endif
#ifdef USE_USB_HS
usb_para_init(&hid_host_core, USBHS0, USB_SPEED_HIGH);
#endif
#endif /* USE_USBHS0 */
#ifdef USE_USBHS1
#ifdef USE_USB_FS
usb_para_init(&hid_host_core, USBHS1, USB_SPEED_FULL);
#endif
#ifdef USE_USB_HS
usb_para_init(&hid_host_core, USBHS1, USB_SPEED_HIGH);
#endif
#endif /* USE_USBHS1 */
usb_core_driver *udev = (usb_core_driver *)usb_host_hid.data;
usbh_init(&usb_host_hid, &hid_host_core, &usr_cb);
#ifdef USE_USB_HS
#ifndef USE_ULPI_PHY
#ifdef USE_USBHS0
pllusb_rcu_config(USBHS0);
#elif defined USE_USBHS1
pllusb_rcu_config(USBHS1);
#else
#endif
#endif /* !USE_ULPI_PHY */
#endif /* USE_USB_HS */
usb_intr_config();
while(1) {
usbh_core_task(&usb_host_hid);
}
}
↓
进入usbh_init
/*!
\brief USB host stack initializations
\param[in] uhost: pointer to USB host
\param[in] udev: pointer to USB core instance
\param[in] user_cb: pointer to user callback
\param[out] none
\retval none
*/
void usbh_init(usbh_host *uhost, usb_core_driver *udev, usbh_user_cb *user_cb)
{
/* host de-initializations */
usbh_deinit(uhost);
uhost->usr_cb = user_cb;
udev->host.connect_status = 0U;
for(uint8_t i = 0U; i < USBHS_MAX_TX_FIFOS; i++) {
udev->host.pipe.err_count = 0U;
udev->host.pipe.pp_status = PIPE_IDLE;
udev->host.backup_xfercount = 0U;
}
udev->host.pipe[0].ep.mps = 8U;
usb_basic_init(&udev->bp, &udev->regs);
#ifndef DUAL_ROLE_MODE_ENABLED
usb_globalint_disable(&udev->regs);
usb_core_init(udev->bp, &udev->regs);
#ifndef USE_OTG_MODE
usb_curmode_set(&udev->regs, HOST_MODE);
#endif /* USE_OTG_MODE */
usb_host_init(udev);
usb_globalint_enable(&udev->regs);
#endif /* DUAL_ROLE_MODE_ENABLED */
/* link driver to the stack */
udev->host.data = (void *)uhost;
uhost->data = (void *)udev;
/* upon initialize call USR call back */
uhost->usr_cb->dev_init();
}
↓
进入usbh_deinit
/*!
\brief de-initialize USB host
\param[in] uhost: pointer to USB host
\param[out] none
\retval operation status
*/
usbh_status usbh_deinit(usbh_host *uhost)
{
usb_core_driver *udev = (usb_core_driver *)uhost->data;
if (NULL == udev) {
printf("NULL!");
}
/* software initialize */
uhost->cur_state = HOST_DEFAULT;
uhost->backup_state = HOST_DEFAULT;
uhost->enum_state = ENUM_DEFAULT;
uhost->control.ctl_state = CTL_IDLE;
uhost->control.max_len = USB_FS_EP0_MAX_LEN;
uhost->dev_prop.addr = USBH_DEV_ADDR_DEFAULT;
uhost->dev_prop.speed = PORT_SPEED_FULL;
uhost->dev_prop.cur_itf = 0xFFU;
usbh_pipe_free(udev, uhost->control.pipe_in_num);
usbh_pipe_free(udev, uhost->control.pipe_out_num);
return USBH_OK;
}
↓
进入usbh_pipe_free
uint8_t usbh_pipe_free(usb_core_driver *udev, uint8_t pp_num)
{
if(pp_num < HP_MAX) {
udev->host.pipe[3].in_used = 0U;
}
return USBH_OK;
}
从usbh_deinit函数中可以看出udev是一个空指针，下面我加的判空验证也进去了，执行到usbh_pipe_free函数中udev->host.pipe[3].in_used = 0U;这一句时，对空指针解引用，这一句应该有问题吧？可是在我裸机运行此demo时却正常运行，没有异常。然而当移植到项目中时，项目运行的是RT-Thread，走到这一句直接报错hard fault。芯片是GD32H759IMK，想在此问问前辈大佬们，这是什么原因，感激不尽！
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