GD32H7在USB HOST 工作模式 从IAP跳转到APP一个BUG

USB HOST 在IAP挂载U盘后，更新APP程序后

进入app程序化化卡在

/*!
    \brief      configure USB core to soft reset
    \param[in]  usb_regs: pointer to USB core registers
    \param[out] none
    \retval     none
*/
static void usb_core_reset (usb_core_regs *usb_regs)
{
    /* enable core soft reset */
    usb_regs->gr->GRSTCTL |= GRSTCTL_CSRST;

    /* wait for the core to be soft reset */
    while (usb_regs->gr->GRSTCTL & GRSTCTL_CSRST) {
        /* no operation */
    }

    /* wait for additional 3 PHY clocks */
    usb_udelay(3U);
}

这个位置出不来

测试发现是上电初始化顺序的问题，并且进入app前需要关闭USB的时钟与中断

nvic_irq_disable((uint8_t)USBHS0_IRQn); // 失能OTG USB FS中断
nvic_irq_disable((uint8_t)USBHS0_WKUP_IRQn);
exti_interrupt_disable(EXTI_31);

rcu_periph_clock_disable(RCU_USBHS0);   // 失能OTG FS时钟
rcu_periph_clock_disable(RCU_PMU);

需要做如下处理：将官方代码

#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_msc, &usbh_msc);

#ifdef USE_USBHS0

#ifdef USE_USB_FS
    usb_para_init (&msc_host_core, USBHS0, USB_SPEED_FULL);
#endif

#ifdef USE_USB_HS
    usb_para_init (&msc_host_core, USBHS0, USB_SPEED_HIGH);
#endif

#endif /* USE_USBHS0 */

#ifdef USE_USBHS1

#ifdef USE_USB_FS
    usb_para_init (&msc_host_core, USBHS1, USB_SPEED_FULL);
#endif

#ifdef USE_USB_HS
    usb_para_init (&msc_host_core, USBHS1, USB_SPEED_HIGH);
#endif

#endif /* USE_USBHS1 */

    usbh_init(&usb_host_msc, &msc_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_msc);
    }

代码中的 pll 时钟需要靠前初始化

#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 */

 改为：

#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_msc, &usbh_msc);

#ifdef USE_USBHS0

#ifdef USE_USB_FS
    usb_para_init (&msc_host_core, USBHS0, USB_SPEED_FULL);
#endif

#ifdef USE_USB_HS
    usb_para_init (&msc_host_core, USBHS0, USB_SPEED_HIGH);
#endif

#endif /* USE_USBHS0 */

#ifdef USE_USBHS1

#ifdef USE_USB_FS
    usb_para_init (&msc_host_core, USBHS1, USB_SPEED_FULL);
#endif

#ifdef USE_USB_HS
    usb_para_init (&msc_host_core, USBHS1, USB_SPEED_HIGH);
#endif

#endif /* USE_USBHS1 */

#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 */

    usbh_init(&usb_host_msc, &msc_host_core, &usr_cb);
		
    usb_intr_config();

    while (1) {
        usbh_core_task(&usb_host_msc);
    }

即可正常跳转。