usbd_udphs.c

Include startup files and peripherial devices Code for Atmel ARM7 development

//------------------------------------------------------------------------------
void USBD_InterruptHandler(void)
{
    unsigned int  status;
    unsigned char numIT;

    if (deviceState >= USBD_STATE_POWERED) {

        LED_Set(USBD_LEDUSB);
    }

    // Get interrupts status
    status = AT91C_BASE_UDPHS->UDPHS_INTSTA & AT91C_BASE_UDPHS->UDPHS_IEN;

    // Handle all UDPHS interrupts
    TRACE_DEBUG_WP("H");
    while (status != 0) {

        // Start Of Frame (SOF)
        if ((status & AT91C_UDPHS_IEN_SOF) != 0) {

            TRACE_DEBUG_WP("SOF ");

            // Invoke the SOF callback
            //USB_StartOfFrameCallback(pUsb);

            // Acknowledge interrupt
            AT91C_BASE_UDPHS->UDPHS_CLRINT = AT91C_UDPHS_IEN_SOF;
            status &= ~AT91C_UDPHS_IEN_SOF;
        }
        // Suspend
        // This interrupt is always treated last (hence the '==')
        else if (status == AT91C_UDPHS_DET_SUSPD) {

            TRACE_DEBUG_WP("S");

            // The device enters the Suspended state
            // MCK + UDPCK must be off
            // Pull-Up must be connected
            // Transceiver must be disabled

            LED_Clear(USBD_LEDUSB);

            UDPHS_DisableBIAS();

            // Enable wakeup
            AT91C_BASE_UDPHS->UDPHS_IEN |= AT91C_UDPHS_WAKE_UP | AT91C_UDPHS_ENDOFRSM;
            AT91C_BASE_UDPHS->UDPHS_IEN &= ~AT91C_UDPHS_DET_SUSPD;

            // Acknowledge interrupt
            AT91C_BASE_UDPHS->UDPHS_CLRINT = AT91C_UDPHS_DET_SUSPD | AT91C_UDPHS_WAKE_UP;
            previousDeviceState = deviceState;
            deviceState = USBD_STATE_SUSPENDED;
            UDPHS_DisableUsbClock();

            // Invoke the Suspend callback
            USBDCallbacks_Suspended();
        }
        // Resume
        else if( ((status & AT91C_UDPHS_WAKE_UP) != 0)      // line activity
              || ((status & AT91C_UDPHS_ENDOFRSM) != 0))  { // pc wakeup

//JCB
#ifdef NOT_DEFINED
#if !defined(PIN_USB_VBUS)
            // Configure PIO
            PIO_Configure(&pinVbus, 1);

            // Check current level on VBus
            if (PIO_Get(&pinVbus) == 1)    // Protection
#endif
#endif
            {
                // Invoke the Resume callback
                USBDCallbacks_Resumed();

                TRACE_DEBUG_WP("R");

                UDPHS_EnableUsbClock();
                UDPHS_EnableBIAS();

                // The device enters Configured state
                // MCK + UDPCK must be on
                // Pull-Up must be connected
                // Transceiver must be enabled

                deviceState = previousDeviceState;

                AT91C_BASE_UDPHS->UDPHS_CLRINT = AT91C_UDPHS_WAKE_UP | AT91C_UDPHS_ENDOFRSM | AT91C_UDPHS_DET_SUSPD;

                AT91C_BASE_UDPHS->UDPHS_IEN |= AT91C_UDPHS_ENDOFRSM | AT91C_UDPHS_DET_SUSPD;
                AT91C_BASE_UDPHS->UDPHS_CLRINT = AT91C_UDPHS_WAKE_UP | AT91C_UDPHS_ENDOFRSM;
                AT91C_BASE_UDPHS->UDPHS_IEN &= ~AT91C_UDPHS_WAKE_UP;
            }
// jcb !!!
#ifdef NOT_DEFINED
#if !defined(PIN_USB_VBUS)
            else {

                // No VBUS
                // Disconnect the pull-up
                USBD_Disconnect();
                AT91C_BASE_UDPHS->UDPHS_CLRINT = AT91C_UDPHS_WAKE_UP;
            }
#endif
#endif
        }
        // End of bus reset
        else if ((status & AT91C_UDPHS_ENDRESET) == AT91C_UDPHS_ENDRESET) {

//            TRACE_DEBUG_WP("EoB ");

            // The device enters the Default state
            deviceState = USBD_STATE_DEFAULT;
            //      MCK + UDPCK are already enabled
            //      Pull-Up is already connected
            //      Transceiver must be enabled
            //      Endpoint 0 must be enabled

            UDPHS_ResetEndpoints();
            UDPHS_DisableEndpoints();
            USBD_ConfigureEndpoint(0);

            // Flush and enable the Suspend interrupt
            AT91C_BASE_UDPHS->UDPHS_CLRINT = AT91C_UDPHS_WAKE_UP | AT91C_UDPHS_DET_SUSPD;

            //// Enable the Start Of Frame (SOF) interrupt if needed
            //if (pCallbacks->startOfFrame != 0)
            //{
            //    AT91C_BASE_UDPHS->UDPHS_IEN |= AT91C_UDPHS_IEN_SOF;
            //}

            // Invoke the Reset callback
            USBDCallbacks_Reset();

            // Acknowledge end of bus reset interrupt
            AT91C_BASE_UDPHS->UDPHS_CLRINT = AT91C_UDPHS_ENDRESET;

            AT91C_BASE_UDPHS->UDPHS_IEN |= AT91C_UDPHS_DET_SUSPD;
        }
        // Handle upstream resume interrupt
        else if (status & AT91C_UDPHS_UPSTR_RES) {

            TRACE_DEBUG_WP("ExtRes ");

            // - Acknowledge the IT
            AT91C_BASE_UDPHS->UDPHS_CLRINT = AT91C_UDPHS_UPSTR_RES;
        }
        // Endpoint interrupts
        else {
#ifndef DMA
            // Handle endpoint interrupts
            for (numIT = 0; numIT < NUM_IT_MAX; numIT++) {

                if ((status & (1 << SHIFT_INTERUPT << numIT)) != 0) {

                    UDPHS_EndpointHandler(numIT);
                }
            }
#else
            // Handle endpoint control interrupt
            if ((status & (1 << SHIFT_INTERUPT << 0)) != 0) {

                UDPHS_EndpointHandler( 0 );
            }
            else {

                numIT = 1;
                while((status&(0x7E<<SHIFT_DMA)) != 0) {

                    // Check if endpoint has a pending interrupt
                    if ((status & (1 << SHIFT_DMA << numIT)) != 0) {

                        UDPHS_DmaHandler(numIT);
                        status &= ~(1 << SHIFT_DMA << numIT);
                        if (status != 0) {

                            TRACE_INFO_WP("\n\r  - ");
                        }
                    }
                    numIT++;
                }
            }
#endif
        }

        // Retrieve new interrupt status
        status = AT91C_BASE_UDPHS->UDPHS_INTSTA & AT91C_BASE_UDPHS->UDPHS_IEN;

        TRACE_DEBUG_WP("\n\r");
        if (status != 0) {

            TRACE_DEBUG_WP("  - ");
        }
    }

    if (deviceState >= USBD_STATE_POWERED) {

        LED_Clear(USBD_LEDUSB);
    }
}

//------------------------------------------------------------------------------
/// Configure an endpoint with the provided endpoint descriptor
/// \param pDdescriptor Pointer to the endpoint descriptor
//------------------------------------------------------------------------------
void USBD_ConfigureEndpoint(const USBEndpointDescriptor *pDescriptor)
{
    Endpoint *pEndpoint;
    unsigned char bEndpoint;
    unsigned char bType;
    unsigned char bEndpointDir;
    unsigned char bSizeEpt = 0;

    // NULL descriptor -> Control endpoint 0
    if (pDescriptor == 0) {

        bEndpoint = 0;
        pEndpoint = &(endpoints[bEndpoint]);
        bType = USBEndpointDescriptor_CONTROL;
        bEndpointDir = 0;
        pEndpoint->size = BOARD_USB_ENDPOINTS_MAXPACKETSIZE(0);
        pEndpoint->bank = BOARD_USB_ENDPOINTS_BANKS(0);
    }
    else  {

        // The endpoint number
        bEndpoint = USBEndpointDescriptor_GetNumber(pDescriptor);
        pEndpoint = &(endpoints[bEndpoint]);
        // Transfer type: Control, Isochronous, Bulk, Interrupt
        bType = USBEndpointDescriptor_GetType(pDescriptor);
        // Direction, ignored for control endpoints
        bEndpointDir = USBEndpointDescriptor_GetDirection(pDescriptor);
        pEndpoint->size = USBEndpointDescriptor_GetMaxPacketSize(pDescriptor);
        pEndpoint->bank = BOARD_USB_ENDPOINTS_BANKS(bEndpoint);
    }

    // Abort the current transfer is the endpoint was configured and in
    // Write or Read state
    if( (pEndpoint->state == UDP_ENDPOINT_RECEIVING)
     || (pEndpoint->state == UDP_ENDPOINT_SENDING) ) {

        UDPHS_EndOfTransfer(bEndpoint, USBD_STATUS_RESET);
    }
    pEndpoint->state = UDP_ENDPOINT_IDLE;

    // Disable endpoint
    AT91C_BASE_UDPHS->UDPHS_EPT[bEndpoint].UDPHS_EPTCTLDIS = AT91C_UDPHS_SHRT_PCKT
                                                           | AT91C_UDPHS_BUSY_BANK
                                                           | AT91C_UDPHS_NAK_OUT
                                                           | AT91C_UDPHS_NAK_IN
                                                           | AT91C_UDPHS_STALL_SNT
                                                           | AT91C_UDPHS_RX_SETUP
                                                           | AT91C_UDPHS_TX_PK_RDY
                                                           | AT91C_UDPHS_TX_COMPLT
                                                           | AT91C_UDPHS_RX_BK_RDY
                                                           | AT91C_UDPHS_ERR_OVFLW
                                                           | AT91C_UDPHS_MDATA_RX
                                                           | AT91C_UDPHS_DATAX_RX
                                                           | AT91C_UDPHS_NYET_DIS
                                                           | AT91C_UDPHS_INTDIS_DMA
                                                           | AT91C_UDPHS_AUTO_VALID
                                                           | AT91C_UDPHS_EPT_DISABL;

    // Reset Endpoint Fifos
    AT91C_BASE_UDPHS->UDPHS_EPT[bEndpoint].UDPHS_EPTCLRSTA = AT91C_UDPHS_TOGGLESQ | AT91C_UDPHS_FRCESTALL;
    AT91C_BASE_UDPHS->UDPHS_EPTRST = 1<<bEndpoint;

    // Configure endpoint
    if( pEndpoint->size <= 8 )  {
        bSizeEpt = 0;
    } 
    else if ( pEndpoint->size <= 16 ) {
        bSizeEpt = 1;
    }
    else if ( pEndpoint->size <= 32 ) {
        bSizeEpt = 2;
    }
    else if ( pEndpoint->size <= 64 ) {
        bSizeEpt = 3;
    }
    else if ( pEndpoint->size <= 128 ) {
        bSizeEpt = 4;
    }
    else if ( pEndpoint->size <= 256 ) {
        bSizeEpt = 5;
    }
    else if ( pEndpoint->size <= 512 )  {
        bSizeEpt = 6;
    }
    else if ( pEndpoint->size <= 1024 ) {
        bSizeEpt = 7;
    } //else {
    //  sizeEpt = 0; // control endpoint
    //}

    // Configure endpoint
    if (bType == USBEndpointDescriptor_CONTROL) {

        // Enable endpoint IT for control endpoint
        AT91C_BASE_UDPHS->UDPHS_IEN |= (1<<SHIFT_INTERUPT<<bEndpoint);
    }


    AT91C_BASE_UDPHS->UDPHS_EPT[bEndpoint].UDPHS_EPTCFG = bSizeEpt 
                                                        | (bEndpointDir << 3) 
                                                        | (bType << 4) 
                                                        | ((pEndpoint->bank) << 6);

    while( (signed int)AT91C_UDPHS_EPT_MAPD != (signed int)((AT91C_BASE_UDPHS->UDPHS_EPT[bEndpoint].UDPHS_EPTCFG) & AT91C_UDPHS_EPT_MAPD) ) {

        // resolved by clearing the reset IT in good place
        TRACE_ERROR("PB bEndpoint: 0x%X\n\r", bEndpoint);
        TRACE_ERROR("PB bSizeEpt: 0x%X\n\r", bSizeEpt);
        TRACE_ERROR("PB bEndpointDir: 0x%X\n\r", bEndpointDir);
        TRACE_ERROR("PB bType: 0x%X\n\r", bType);
        TRACE_ERROR("PB pEndpoint->bank: 0x%X\n\r", pEndpoint->bank);
        TRACE_ERROR("PB UDPHS_EPTCFG: 0x%X\n\r", AT91C_BASE_UDPHS->UDPHS_EPT[bEndpoint].UDPHS_EPTCFG);
        for(;;);
    }

    if (bType == USBEndpointDescriptor_CONTROL) {

        AT91C_BASE_UDPHS->UDPHS_EPT[bEndpoint].UDPHS_EPTCTLENB = AT91C_UDPHS_RX_BK_RDY 
                                                               | AT91C_UDPHS_RX_SETUP
                                                               | AT91C_UDPHS_EPT_ENABL;
    }
    else {
#ifndef DMA
        AT91C_BASE_UDPHS->UDPHS_EPT[bEndpoint].UDPHS_EPTCTLENB = AT91C_UDPHS_EPT_ENABL;
#else
        AT91C_BASE_UDPHS->UDPHS_EPT[bEndpoint].UDPHS_EPTCTLENB = AT91C_UDPHS_AUTO_VALID 
                                                               | AT91C_UDPHS_EPT_ENABL;
#endif
    }

}