c5509_usb_control.c

MSP430与dsp接口技术1,编辑环境C语言,我运行过,好

/*
 *  Copyright 2003 by Texas Instruments Incorporated.
 *  All rights reserved. Property of Texas Instruments Incorporated.
 *  Restricted rights to use, duplicate or disclose this code are
 *  granted through contract.
 *  
 */
/* "@(#) DDK 1.11.00.00 11-04-03 (ddk-b13)" */
/*
 *  ======== _C5509_USB_mdControlChan.c ========
 *  This file inmplements the _mdControlChan() function 
 */

#include <std.h>
#include <hwi.h>
#include <csl.h>
#include <csl_usb.h>
#include <_c5509_usb.h>
#include <c5509_usb.h>

/*
 *  ======== connectDevice ========
 *  This function calls USB_connectDev to pull up D+ wire so that bus 
 *  enumeration starts by the host.
 *  Call with INTRs enabled.
 */
Void connectDevice(C5509_USB_ChanHandle chan, C5509_USB_AppCallback * cbFxn)
{   
 
    USB_connectDev(USB0);    /* connect it to upstream port */

    if (cbFxn != NULL) {
        /* save away fxn and arg to call when we are connected */
        chan->fxnConnect = cbFxn->fxn;
        chan->argConnect = cbFxn->arg;
        /*
         *  Check if host has already enumerated USB.
         *  busConnected is set after host reads the USB config desc.
         */
        if (_C5509_USB_devObj.busConnected == TRUE) {
            /* call connect fxn with arg */
            chan->fxnConnect(chan->argConnect);
        }
    }
    else {
        /* no callback specified so spin until bus connected ! */
        while (_C5509_USB_devObj.busConnected == FALSE);       
    }    
}

/* 
 *  ======== _C5509_USB_freeAllPackets ========
 *  This function is called to free packets and complete IOM_FLUSH 
 *  for all channels
 */
Void _C5509_USB_freeAllPackets()
{
    Int i;
    C5509_USB_ChanHandle chan;
    
    for (i=1; i < _C5509_USB_ENDPTNUMS; i++) {
        chan = _C5509_USB_devObj.chans[i];
        if (chan) {
            
            /* abort all pending I/Os */
            _C5509_USB_removePackets( chan, IOM_ABORTED );
            
            /* complete IOM_FLUSH if any */
            _C5509_USB_flushPacketHandler( chan, chan->flushPacket );
        }
    }
}


/*
 *  ========= resetDevice ========
 *  This function is called to reset the USB device.
 *  Call with INTRs disabled.
 */
Void resetDevice()
{
        
    /* stop all data transfer activities */
    USB_abortAllTransaction(USB0);
    
    /* reset device h/w and disconnect it from host */
    USB_resetDev(USB0); 
    
    /* return packets and complete IOM_FLUSH for all channels */
    _C5509_USB_freeAllPackets();

    _C5509_USB_devObj.busConnected = FALSE; 

}

/*
 *  ======== _C5509_USB_reInitUsb ========
 *  This function re-initializes usb module, set device state to default state.
 */
Void _C5509_USB_reInitUsb() 
{
    /* reset device config number */
    _C5509_USB_devObj.stateInfo.usbCurConfig = 0x00;  
    
    /* reset Alt Setting number */
    _C5509_USB_devObj.stateInfo.usbCurAltSet = 0x00; 
  
    /* reconfig the USB module */
    USB_init(USB0, &_C5509_USB_devObj.eps[0], _C5509_USB_devParams->pSofTmrCnt);
}

/*
 *  ======== _C5509_USB_mdControlChan ========
 *  This function preforms various device dependent operations.
 *
 *  chanp is the point to the chanObj
 *
 *  cmd is the control command
 *
 *  args is the optional argument.
 *
 *  
 *  IOM_CHAN_RESET and IOM_CHAN_TIMEDOUT are handled in the same way.
 *  It aborts all pending I/Os and completes any IOM_FLUSHing . 
 *
 *  IOM_DEVICE_RESET dis-connects the device from host, aborts all 
 *   pending I/Os, completes all IOM_FLUSHes.
 *  It then re-init the usb module. After that, application should 
 *   re-create channels and re-connect device to start I/O again.
 *
 *  C5509_USB_DEVICECONNECT call connectDevice to re-start bus enumeration.
 *
 *  C5509_USB_GETSTATEINFO returns USB state information in the 
 *   C5509_USB_StateInfo structure passed in by the application provide arg.
 *  If arg is NULL an error status is returned.
 */
Int _C5509_USB_mdControlChan(Ptr chanp, Uns cmd, Ptr args)
{
    C5509_USB_ChanHandle chan = chanp;
    Uns imask;
    C5509_USB_AppCallback * connectCb;
    C5509_USB_StateInfo * stateInfo;
    Int status = IOM_COMPLETED;
        
    switch(cmd) {

        case IOM_CHAN_RESET:
        case IOM_CHAN_TIMEDOUT:
                  
            /* discard all pending IO packets */
            imask = HWI_disable();    /* disable INTRs */   
            _C5509_USB_removePackets(chan, IOM_ABORTED);
            _C5509_USB_flushPacketHandler( chan, chan->flushPacket);
            HWI_restore(imask);
            break;
        case IOM_DEVICE_RESET:

            imask = HWI_disable();    /* disable INTRs */   
            resetDevice();            /* reset device  */
            HWI_restore(imask);       
            /* 
             * re-init usb module, set state to default 
             */
            _C5509_USB_reInitUsb();    
            break;

        case C5509_USB_DEVICECONNECT:

            connectCb = args;
            connectDevice(chan, connectCb);    /* connect the device */
            break;
                     
        case C5509_USB_GETSTATEINFO:
   
            if (args == NULL) {
                return (IOM_EBADARGS);
            }
          
            stateInfo =  (C5509_USB_StateInfo *)args;
            imask = HWI_disable();    /* disable INTRs */
            *stateInfo = _C5509_USB_devObj.stateInfo; /* copy to user struct */
            HWI_restore(imask);       
            break;

        default:
            status = IOM_ENOTIMPL;    /* cmd has not been implemented */
            break;

    } /* end switch */

    return status;
}