/** Task to manage the Mass Storage interface, reading in Command Block Wrappers from the host, processing the SCSI commands they
* contain, and returning Command Status Wrappers back to the host to indicate the success or failure of the last issued command.
*/
void MassStorage_Task(void)
{
/* Device must be connected and configured for the task to run */
if (USB_DeviceState != DEVICE_STATE_Configured)
return;
/* Process sent command block from the host if one has been sent */
if (ReadInCommandBlock())
{
/* Indicate busy */
LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
/* Check direction of command, select Data IN endpoint if data is from the device */
if (CommandBlock.Flags & COMMAND_DIRECTION_DATA_IN)
Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
/* Decode the received SCSI command, set returned status code */
CommandStatus.Status = SCSI_DecodeSCSICommand() ? Command_Pass : Command_Fail;
/* Load in the CBW tag into the CSW to link them together */
CommandStatus.Tag = CommandBlock.Tag;
/* Load in the data residue counter into the CSW */
CommandStatus.DataTransferResidue = CommandBlock.DataTransferLength;
/* Stall the selected data pipe if command failed (if data is still to be transferred) */
if ((CommandStatus.Status == Command_Fail) && (CommandStatus.DataTransferResidue))
Endpoint_StallTransaction();
/* Return command status block to the host */
ReturnCommandStatus();
/* Indicate ready */
LEDs_SetAllLEDs(LEDMASK_USB_READY);
}
/* Check if a Mass Storage Reset occurred */
if (IsMassStoreReset)
{
/* Reset the data endpoint banks */
Endpoint_ResetFIFO(MASS_STORAGE_OUT_EPNUM);
Endpoint_ResetFIFO(MASS_STORAGE_IN_EPNUM);
Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
Endpoint_ClearStall();
Endpoint_ResetDataToggle();
Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
Endpoint_ClearStall();
Endpoint_ResetDataToggle();
/* Clear the abort transfer flag */
IsMassStoreReset = false;
}
}
void MS_Device_USBTask(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo)
{
if (USB_DeviceState != DEVICE_STATE_Configured)
return;
Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber);
if (Endpoint_IsReadWriteAllowed())
{
if (MS_Device_ReadInCommandBlock(MSInterfaceInfo))
{
if (MSInterfaceInfo->State.CommandBlock.Flags & MS_COMMAND_DIR_DATA_IN)
Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataINEndpointNumber);
MSInterfaceInfo->State.CommandStatus.Status = CALLBACK_MS_Device_SCSICommandReceived(MSInterfaceInfo) ?
MS_SCSI_COMMAND_Pass : MS_SCSI_COMMAND_Fail;
MSInterfaceInfo->State.CommandStatus.Signature = MS_CSW_SIGNATURE;
MSInterfaceInfo->State.CommandStatus.Tag = MSInterfaceInfo->State.CommandBlock.Tag;
MSInterfaceInfo->State.CommandStatus.DataTransferResidue = MSInterfaceInfo->State.CommandBlock.DataTransferLength;
if ((MSInterfaceInfo->State.CommandStatus.Status == MS_SCSI_COMMAND_Fail) &&
(MSInterfaceInfo->State.CommandStatus.DataTransferResidue))
{
Endpoint_StallTransaction();
}
MS_Device_ReturnCommandStatus(MSInterfaceInfo);
}
}
if (MSInterfaceInfo->State.IsMassStoreReset)
{
Endpoint_ResetFIFO(MSInterfaceInfo->Config.DataOUTEndpointNumber);
Endpoint_ResetFIFO(MSInterfaceInfo->Config.DataINEndpointNumber);
Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataOUTEndpointNumber);
Endpoint_ClearStall();
Endpoint_ResetDataToggle();
Endpoint_SelectEndpoint(MSInterfaceInfo->Config.DataINEndpointNumber);
Endpoint_ClearStall();
Endpoint_ResetDataToggle();
MSInterfaceInfo->State.IsMassStoreReset = false;
}
}
/*
* The Linux and OSX call the configuration changed entry each time
* a transaction is started (e.g., multiple runs of cbmctrl status).
* We need to reset the endpoints before reconfiguring them, otherwise
* we get a hang the second time through.
*
* We keep the original endpoint selected after returning.
*/
void
USB_ResetConfig()
{
static uint8_t endpoints[] = {
XUM_BULK_IN_ENDPOINT, XUM_BULK_OUT_ENDPOINT, 0,
};
uint8_t lastEndpoint, *endp;
lastEndpoint = Endpoint_GetCurrentEndpoint();
for (endp = endpoints; *endp != 0; endp++) {
Endpoint_SelectEndpoint(*endp);
Endpoint_ResetFIFO(*endp);
Endpoint_ResetDataToggle();
if (Endpoint_IsStalled())
Endpoint_ClearStall();
}
Endpoint_SelectEndpoint(lastEndpoint);
}
