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使用STM32F105以及官方的USB库模拟usb转串口，USB的电源5V不监测。初始化usb，打开串口输出正常，然后关闭串口，一段时间程序就一直在中断函数uint32_t USBD_OTG_ISR_Handler (USB_OTG_CORE_HANDLE *pdev)跳不出来，设断点于retval |= DCD_HandleInEP_ISR(pdev);一直进入这里无法返回主函数。
uint32_t USBD_OTG_ISR_Handler (USB_OTG_CORE_HANDLE *pdev)
{
USB_OTG_GINTSTS_TypeDef gintr_status;
uint32_t retval = 0;
if (USB_OTG_IsDeviceMode(pdev)) /* ensure that we are in device mode */
{
gintr_status.d32 = USB_OTG_ReadCoreItr(pdev);
if (!gintr_status.d32) /* avoid spurious interrupt */
{
return 0;
}
if (gintr_status.b.outepintr)
{
retval |= DCD_HandleOutEP_ISR(pdev);
}
if (gintr_status.b.inepint)
{
retval |= DCD_HandleInEP_ISR(pdev);//程序一直进入此处
}
if (gintr_status.b.modemismatch)
{
USB_OTG_GINTSTS_TypeDef gintsts;
/* Clear interrupt */
gintsts.d32 = 0;
gintsts.b.modemismatch = 1;
USB_OTG_WRITE_REG32(&pdev->regs.GREGS->GINTSTS, gintsts.d32);
}
if (gintr_status.b.wkupintr)
{
retval |= DCD_HandleResume_ISR(pdev);
}
if (gintr_status.b.usbsuspend)
{
retval |= DCD_HandleUSBSuspend_ISR(pdev);
}
if (gintr_status.b.sofintr)
{
retval |= DCD_HandleSof_ISR(pdev);
}
if (gintr_status.b.rxstsqlvl)
{
retval |= DCD_HandleRxStatusQueueLevel_ISR(pdev);
}
if (gintr_status.b.usbreset)
{
retval |= DCD_HandleUsbReset_ISR(pdev);
}
if (gintr_status.b.enumdone)
{
retval |= DCD_HandleEnumDone_ISR(pdev);
}
if (gintr_status.b.incomplisoin)
{
retval |= DCD_IsoINIncomplete_ISR(pdev);
}
if (gintr_status.b.incomplisoout)
{
retval |= DCD_IsoOUTIncomplete_ISR(pdev);
}
#ifdef VBUS_SENSING_ENABLED
if (gintr_status.b.sessreqintr)
{
retval |= DCD_SessionRequest_ISR(pdev);
}
if (gintr_status.b.otgintr)
{
retval |= DCD_OTG_ISR(pdev);
}
#endif
}
return retval;
}
重新打开串口，输出又正常了，主程序部分接着可以执行，求大神指点原因~~
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阿莫论坛20周年了！感谢大家的支持与爱护！！
曾经有一段真挚的爱情摆在我的面前，我没有珍惜，现在想起来，还好我没有珍惜……
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发表于 2016-2-23 18:42:01
楼主
