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   源码介绍

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CyFxMscCswReturnStatus_t
CyFxMscSendCsw(
    CyFxMscCswReturnStatus_t cswReturnStatus    /* Command Status */
    )
{
    /* Update the residue length in the CSW */
    glMscCswStatus[11] = (uint8_t)((glCswDataResidue & 0xFF000000) >> 24);
    glMscCswStatus[10] = (uint8_t)((glCswDataResidue & 0x00FF0000) >> 16);
    glMscCswStatus[9] = (uint8_t)((glCswDataResidue & 0x0000FF00) >> 8);
    glMscCswStatus[8] = (uint8_t)(glCswDataResidue & 0x000000FF);

    /* Update the status in the CSW */
    glMscCswStatus[12] = (uint8_t)(cswReturnStatus & 0x3);

    /* Check for phase error */
    if (cswReturnStatus == CY_FX_CBW_CMD_PHASE_ERROR)
    {
        glInPhaseError = CyTrue;

        CyU3PUsbFlushEp(CY_FX_MSC_EP_BULK_IN);
        CyU3PUsbFlushEp(CY_FX_MSC_EP_BULK_OUT);
        /* Stall the IN endpoint */
        CyU3PUsbStall(CY_FX_MSC_EP_BULK_IN, CyTrue, CyFalse);

        /* Stall the OUT endpoint */
        CyU3PUsbStall(CY_FX_MSC_EP_BULK_OUT, CyTrue, CyFalse);

        CyU3PDmaChannelReset(&glChHandleMscIn);
        CyU3PDmaChannelReset(&glChHandleMscOut);
    }
    /* Check for Command failed */
    else if (cswReturnStatus == CY_FX_CBW_CMD_FAILED)
    {
        /* Only when data is expected or to be sent stall the EPs */
        if (glDataTxLength != 0)
        {
            /* Check direction */
            if (glCmdDirection == 0x00)
            {
                /* Stall the OUT endpoint */
                CyU3PUsbStall(CY_FX_MSC_EP_BULK_OUT, CyTrue, CyFalse);
            }
            else
            {
                CyU3PUsbFlushEp(CY_FX_MSC_EP_BULK_IN);
                /* Stall the IN endpoint */
                CyU3PUsbStall(CY_FX_MSC_EP_BULK_IN, CyTrue, CyFalse);
                CyU3PDmaChannelReset(&glChHandleMscIn);
            }
        }
    }
    else
    {
        /* No operation. Proceed to send the status */
    }

    /* Send the status to the host */
    if (CyFxMscSendUSBData(glMscCswStatus, CY_FX_MSC_CSW_MAX_COUNT) != CY_U3P_SUCCESS)
    {
        cswReturnStatus = CY_FX_CBW_CMD_MSC_RESET;
    }

    /* Return status */
    return cswReturnStatus;
}