stm32 USB OTG mass storage device enumeration failed

[danashevskiy]

Posted on November 03, 2015 at 10:20

In my device based on stm32f107 connectivity line model i use

http://www.st.com/web/en/catalog/tools/PF257882#

http://www.st.com/web/en/catalog/tools/PF257882#

. When i connect device to the PC with Windows 7, last one recognizes stm32f107 as ''Unknown Device''. This means that USB enumeration process has been failed and i can't understand ''why?''

The early interrupt routine can be found in usb_dcd_int.c of standart library.

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); }

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; }  In debug mode i've found that switch process stops in DCD_HandleEnumDone_ISR.   static uint32_t DCD_HandleEnumDone_ISR(USB_OTG_CORE_HANDLE *pdev) { USB_OTG_GINTSTS_TypeDef gintsts; USB_OTG_GUSBCFG_TypeDef gusbcfg; USB_OTG_EP0Activate(pdev); /* Set USB turn-around time based on device speed and PHY interface. */ gusbcfg.d32 = USB_OTG_READ_REG32(&pdev->regs.GREGS->GUSBCFG); /* Full or High speed */ if ( USB_OTG_GetDeviceSpeed(pdev) == USB_SPEED_HIGH) { pdev->cfg.speed = USB_OTG_SPEED_HIGH; pdev->cfg.mps = USB_OTG_HS_MAX_PACKET_SIZE ; gusbcfg.b.usbtrdtim = 9; } else { pdev->cfg.speed = USB_OTG_SPEED_FULL; pdev->cfg.mps = USB_OTG_FS_MAX_PACKET_SIZE ; gusbcfg.b.usbtrdtim = 5; } USB_OTG_WRITE_REG32(&pdev->regs.GREGS->GUSBCFG, gusbcfg.d32); /* Clear interrupt */ gintsts.d32 = 0; gintsts.b.enumdone = 1; USB_OTG_WRITE_REG32( &pdev->regs.GREGS->GINTSTS, gintsts.d32 ); return 1; }   Here host should give device address and check it's descriptors. And after that there are no actions. What can be the reason of failing enumeration process?BTW i have flash chip in device and i didn't mounted any filesystems on it.

UPDATE: After checking the signal processes with oscilloscope i've found that data flows only in one way. PC sends some commands, i think stm32 even reads this input data with

USB_OTG_READ_REG32()

and then tries to send data with

USB_OTG_WRITE_REG32()

but i see no signal on oscilloscope display.

#usb #stm32f10x