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335 lines
11 KiB
335 lines
11 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Main source file for the Mass Storage demo. This file contains the main tasks of the demo and
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* is responsible for the initial application hardware configuration.
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*/
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#define INCLUDE_FROM_MASSSTORAGE_C
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#include "MassStorage.h"
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/* Global Variables */
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/** Structure to hold the latest Command Block Wrapper issued by the host, containing a SCSI command to execute. */
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CommandBlockWrapper_t CommandBlock;
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/** Structure to hold the latest Command Status Wrapper to return to the host, containing the status of the last issued command. */
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CommandStatusWrapper_t CommandStatus = { .Signature = CSW_SIGNATURE };
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/** Flag to asynchronously abort any in-progress data transfers upon the reception of a mass storage reset command. */
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volatile bool IsMassStoreReset = false;
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/** Main program entry point. This routine configures the hardware required by the application, then
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* starts the scheduler to run the application tasks.
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*/
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int main(void)
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{
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SetupHardware();
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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for (;;)
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{
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MassStorage_Task();
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USB_USBTask();
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}
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}
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/** Configures the board hardware and chip peripherals for the demo's functionality. */
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void SetupHardware(void)
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{
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/* Disable watchdog if enabled by bootloader/fuses */
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MCUSR &= ~(1 << WDRF);
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wdt_disable();
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/* Disable clock division */
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clock_prescale_set(clock_div_1);
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/* Hardware Initialization */
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LEDs_Init();
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Dataflash_Init(SPI_SPEED_FCPU_DIV_2);
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USB_Init();
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/* Clear Dataflash sector protections, if enabled */
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DataflashManager_ResetDataflashProtections();
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}
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/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
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void EVENT_USB_Connect(void)
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{
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/* Indicate USB enumerating */
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LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
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/* Reset the MSReset flag upon connection */
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IsMassStoreReset = false;
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}
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/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
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* the status LEDs and stops the Mass Storage management task.
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*/
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void EVENT_USB_Disconnect(void)
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{
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/* Indicate USB not ready */
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LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
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}
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/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
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* of the USB device after enumeration - the device endpoints are configured and the Mass Storage management task started.
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*/
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void EVENT_USB_ConfigurationChanged(void)
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{
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/* Indicate USB connected and ready */
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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/* Setup Mass Storage In and Out Endpoints */
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if (!(Endpoint_ConfigureEndpoint(MASS_STORAGE_IN_EPNUM, EP_TYPE_BULK,
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ENDPOINT_DIR_IN, MASS_STORAGE_IO_EPSIZE,
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ENDPOINT_BANK_DOUBLE)))
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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if (!(Endpoint_ConfigureEndpoint(MASS_STORAGE_OUT_EPNUM, EP_TYPE_BULK,
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ENDPOINT_DIR_OUT, MASS_STORAGE_IO_EPSIZE,
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ENDPOINT_BANK_DOUBLE)))
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{
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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}
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/** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
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* control requests that are not handled internally by the USB library (including the Mass Storage class-specific
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* requests) so that they can be handled appropriately for the application.
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*/
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void EVENT_USB_UnhandledControlPacket(void)
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{
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/* Process UFI specific control requests */
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switch (USB_ControlRequest.bRequest)
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{
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case REQ_MassStorageReset:
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if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Indicate that the current transfer should be aborted */
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IsMassStoreReset = true;
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/* Acknowledge status stage */
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while (!(Endpoint_IsINReady()));
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Endpoint_ClearIN();
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}
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break;
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case REQ_GetMaxLUN:
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if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
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{
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Endpoint_ClearSETUP();
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/* Indicate to the host the number of supported LUNs (virtual disks) on the device */
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Endpoint_Write_Byte(TOTAL_LUNS - 1);
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Endpoint_ClearIN();
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/* Acknowledge status stage */
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while (!(Endpoint_IsOUTReceived()));
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Endpoint_ClearOUT();
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}
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break;
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}
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}
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/** Task to manage the Mass Storage interface, reading in Command Block Wrappers from the host, processing the SCSI commands they
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* contain, and returning Command Status Wrappers back to the host to indicate the success or failure of the last issued command.
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*/
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void MassStorage_Task(void)
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{
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/* Check if the USB System is connected to a Host */
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if (USB_IsConnected)
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{
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/* Select the Data Out Endpoint */
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Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
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/* Check to see if a command from the host has been issued */
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if (Endpoint_IsReadWriteAllowed())
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{
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/* Indicate busy */
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LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
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/* Process sent command block from the host */
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if (ReadInCommandBlock())
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{
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/* Check direction of command, select Data IN endpoint if data is from the device */
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if (CommandBlock.Flags & COMMAND_DIRECTION_DATA_IN)
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Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
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/* Decode the received SCSI command */
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SCSI_DecodeSCSICommand();
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/* Load in the CBW tag into the CSW to link them together */
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CommandStatus.Tag = CommandBlock.Tag;
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/* Load in the data residue counter into the CSW */
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CommandStatus.DataTransferResidue = CommandBlock.DataTransferLength;
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/* Stall the selected data pipe if command failed (if data is still to be transferred) */
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if ((CommandStatus.Status == Command_Fail) && (CommandStatus.DataTransferResidue))
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Endpoint_StallTransaction();
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/* Return command status block to the host */
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ReturnCommandStatus();
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/* Check if a Mass Storage Reset occurred */
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if (IsMassStoreReset)
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{
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/* Reset the data endpoint banks */
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Endpoint_ResetFIFO(MASS_STORAGE_OUT_EPNUM);
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Endpoint_ResetFIFO(MASS_STORAGE_IN_EPNUM);
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Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
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Endpoint_ClearStall();
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Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
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Endpoint_ClearStall();
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/* Clear the abort transfer flag */
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IsMassStoreReset = false;
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}
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/* Indicate ready */
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LEDs_SetAllLEDs(LEDMASK_USB_READY);
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}
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else
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{
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/* Indicate error reading in the command block from the host */
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LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
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}
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}
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}
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}
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/** Function to read in a command block from the host, via the bulk data OUT endpoint. This function reads in the next command block
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* if one has been issued, and performs validation to ensure that the block command is valid.
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*
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* \return Boolean true if a valid command block has been read in from the endpoint, false otherwise
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*/
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static bool ReadInCommandBlock(void)
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{
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/* Select the Data Out endpoint */
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Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
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/* Read in command block header */
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Endpoint_Read_Stream_LE(&CommandBlock, (sizeof(CommandBlock) - sizeof(CommandBlock.SCSICommandData)),
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StreamCallback_AbortOnMassStoreReset);
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/* Check if the current command is being aborted by the host */
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if (IsMassStoreReset)
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return false;
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/* Verify the command block - abort if invalid */
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if ((CommandBlock.Signature != CBW_SIGNATURE) ||
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(CommandBlock.LUN >= TOTAL_LUNS) ||
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(CommandBlock.SCSICommandLength > MAX_SCSI_COMMAND_LENGTH))
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{
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/* Stall both data pipes until reset by host */
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Endpoint_StallTransaction();
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Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
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Endpoint_StallTransaction();
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return false;
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}
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/* Read in command block command data */
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Endpoint_Read_Stream_LE(&CommandBlock.SCSICommandData,
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CommandBlock.SCSICommandLength,
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StreamCallback_AbortOnMassStoreReset);
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/* Check if the current command is being aborted by the host */
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if (IsMassStoreReset)
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return false;
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/* Finalize the stream transfer to send the last packet */
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Endpoint_ClearOUT();
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return true;
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}
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/** Returns the filled Command Status Wrapper back to the host via the bulk data IN endpoint, waiting for the host to clear any
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* stalled data endpoints as needed.
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*/
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static void ReturnCommandStatus(void)
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{
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/* Select the Data Out endpoint */
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Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
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/* While data pipe is stalled, wait until the host issues a control request to clear the stall */
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while (Endpoint_IsStalled())
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{
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/* Check if the current command is being aborted by the host */
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if (IsMassStoreReset)
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return;
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}
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/* Select the Data In endpoint */
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Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
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/* While data pipe is stalled, wait until the host issues a control request to clear the stall */
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while (Endpoint_IsStalled())
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{
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/* Check if the current command is being aborted by the host */
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if (IsMassStoreReset)
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return;
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}
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/* Write the CSW to the endpoint */
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Endpoint_Write_Stream_LE(&CommandStatus, sizeof(CommandStatus),
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StreamCallback_AbortOnMassStoreReset);
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/* Check if the current command is being aborted by the host */
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if (IsMassStoreReset)
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return;
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/* Finalize the stream transfer to send the last packet */
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Endpoint_ClearIN();
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}
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/** Stream callback function for the Endpoint stream read and write functions. This callback will abort the current stream transfer
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* if a Mass Storage Reset request has been issued to the control endpoint.
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*/
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uint8_t StreamCallback_AbortOnMassStoreReset(void)
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{
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/* Abort if a Mass Storage reset command was received */
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if (IsMassStoreReset)
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return STREAMCALLBACK_Abort;
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/* Continue with the current stream operation */
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return STREAMCALLBACK_Continue;
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}
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