storage_task.c File Reference

,vThis file manages the mass storage task. More...

#include "config.h"
#include "conf_usb.h"
#include "storage_task.h"
#include "lib_mcu\usb\usb_drv.h"
#include "usb_descriptors.h"
#include "modules\usb\device_chap9\usb_standard_request.h"
#include "usb_specific_request.h"
#include "modules\scsi_decoder\scsi_decoder.h"
#include "modules\control_access\ctrl_access.h"
#include "lib_mem/df/df.h"

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Go to the source code of this file.

Defines

#define Usb_set_ms_data_direction_in()   (ms_data_direction = 1)
#define Usb_set_ms_data_direction_out()   (ms_data_direction = 0)
#define Is_usb_ms_data_direction_in()   (ms_data_direction == 1)

Functions

void usb_mass_storage_cbw (void)
 USB Command Block Wrapper (CBW) management.
void usb_mass_storage_csw (void)
 USB Command Status Wrapper (CSW) management.
void storage_task_init (void)
 This function initializes the hardware/software ressources required for storage task.
void storage_task (void)
 Entry point of the mass storage task management.

Variables

U8 usb_configuration_nb
static bit ms_data_direction
static _MEM_TYPE_SLOW_ U8 dCBWTag [4]
_MEM_TYPE_SLOW_ U8 g_scsi_status
_MEM_TYPE_FAST_ U32 g_scsi_data_remaining
bit ms_multiple_drive
_MEM_TYPE_SLOW_ U8 g_scsi_command [16]
_MEM_TYPE_SLOW_ U8 usb_LUN


Detailed Description

,vThis file manages the mass storage task.

Copyright (c) 2004 Atmel.

Please read file license.txt for copyright notice.

Version:
1.2 at90usb162-2enum-mouse_ms-1_0_1
Id
storage_task.c,v 1.2 2007/01/08 16:09:31 arobert Exp
Todo:
Bug:
/

Definition in file storage_task.c.


Define Documentation

 
#define Usb_set_ms_data_direction_in (  )     (ms_data_direction = 1)

Definition at line 65 of file storage_task.c.

Referenced by usb_mass_storage_cbw().

 
#define Usb_set_ms_data_direction_out (  )     (ms_data_direction = 0)

Definition at line 66 of file storage_task.c.

Referenced by usb_mass_storage_cbw().

 
#define Is_usb_ms_data_direction_in (  )     (ms_data_direction == 1)

Definition at line 67 of file storage_task.c.

Referenced by usb_mass_storage_cbw().


Function Documentation

void usb_mass_storage_cbw ( void   ) 

USB Command Block Wrapper (CBW) management.

This function decodes the CBW command and stores the SCSI command

Warning:
Code:?? bytes (function code length)
Parameters:
none 
Returns:
none

check if dCBWSignature is correct

'U'

'S'

'B'

'C'

Store CBW Tag to be repeated in CSW

if (bmCBWFlags.bit7 == 1) {direction = IN}

dummy CBWCBLength read

Definition at line 127 of file storage_task.c.

References dCBWTag, EP_MS_IN, EP_MS_OUT, FALSE, g_scsi_command, g_scsi_data_remaining, get_cur_lun(), Is_usb_ms_data_direction_in, LSB0, LSB1, LSB2, LSB3, ms_multiple_drive, scsi_decode_command(), TRUE, Usb_ack_receive_out, Usb_enable_stall_handshake, usb_LUN, Usb_read_byte, Usb_select_endpoint, Usb_set_ms_data_direction_in, and Usb_set_ms_data_direction_out.

Referenced by storage_task().

00128 {
00129 bit cbw_error;
00130 U8  c;
00131 U8  dummy;
00132 
00133    cbw_error = FALSE;
00134    Usb_select_endpoint(EP_MS_OUT);           
00135    if (0x55 != Usb_read_byte())
00136       { cbw_error = TRUE; } 
00137    if (0x53 != Usb_read_byte())
00138       { cbw_error = TRUE; } 
00139    if (0x42 != Usb_read_byte())
00140       { cbw_error = TRUE; } 
00141    if (0x43 != Usb_read_byte())
00142       { cbw_error = TRUE; } 
00143 
00144    dCBWTag[0] = Usb_read_byte();             
00145    dCBWTag[1] = Usb_read_byte();
00146    dCBWTag[2] = Usb_read_byte();
00147    dCBWTag[3] = Usb_read_byte();
00148    
00149    LSB0(g_scsi_data_remaining) = Usb_read_byte();
00150    LSB1(g_scsi_data_remaining) = Usb_read_byte();
00151    LSB2(g_scsi_data_remaining) = Usb_read_byte();
00152    LSB3(g_scsi_data_remaining) = Usb_read_byte();
00153 
00154 
00155    if (Usb_read_byte() != 0x00)              
00156    {
00157       Usb_set_ms_data_direction_in();
00158       if (cbw_error)
00159       {
00160          Usb_ack_receive_out();
00161          Usb_select_endpoint(EP_MS_IN);
00162          Usb_enable_stall_handshake();
00163          return;
00164       }
00165    }
00166    else
00167    {
00168       Usb_set_ms_data_direction_out();
00169       if (cbw_error)
00170       {
00171          Usb_enable_stall_handshake();
00172          Usb_ack_receive_out();
00173          return;
00174       }
00175    }
00176 
00177    usb_LUN = Usb_read_byte();
00178 
00179    if (!ms_multiple_drive)
00180    {
00181       usb_LUN = get_cur_lun();
00182    }
00183 
00184    dummy      = Usb_read_byte();                
00185 
00186 
00187    for (c=0; c<16; c++)                         // store scsi_command
00188    {
00189       g_scsi_command[c] = Usb_read_byte();
00190    }
00191 
00192    Usb_ack_receive_out();
00193 
00194    if (Is_usb_ms_data_direction_in())
00195    {
00196       Usb_select_endpoint(EP_MS_IN);
00197    }
00198 
00199    if (TRUE != scsi_decode_command())
00200    {
00201       if (g_scsi_data_remaining != 0)
00202       {
00203          Usb_enable_stall_handshake();
00204       }
00205    }
00206 }

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void usb_mass_storage_csw ( void   ) 

USB Command Status Wrapper (CSW) management.

This function sends the status in relation with the last CBW

Parameters:
none 
Returns:
none

write CSW Signature

'U'

'S'

'B'

'S' write stored CBW Tag

write data residue value

write command status

0 -> PASS, 1 -> FAIL

Definition at line 216 of file storage_task.c.

References dCBWTag, EP_CONTROL, EP_MS_IN, EP_MS_OUT, g_scsi_data_remaining, g_scsi_status, Is_usb_endpoint_stall_requested, Is_usb_receive_setup, Is_usb_write_enabled, usb_process_request(), Usb_select_endpoint, Usb_send_in, and Usb_write_byte.

Referenced by storage_task().

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void storage_task_init ( void   ) 

This function initializes the hardware/software ressources required for storage task.

Parameters:
none 
Returns:
none
/

Definition at line 79 of file storage_task.c.

References df_init_spi, df_mem_init(), and Leds_init.

00080 {
00081    Leds_init();
00082    //Usb_enable_sof_interrupt();
00083    df_init_spi();    // Init the board (definition of the links between the DF and AVR USB)
00084    df_mem_init();    // Init the hw/sw ressources required to drive the DF.
00085 
00086 }

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void storage_task ( void   ) 

Entry point of the mass storage task management.

This function links the mass storage SCSI commands and the USB bus.

Parameters:
none 
Returns:
none

Definition at line 100 of file storage_task.c.

References EP_MS_OUT, Is_device_enumerated, Is_usb_receive_out, usb_mass_storage_cbw(), usb_mass_storage_csw(), and Usb_select_endpoint.

00101 {
00102    if (Is_device_enumerated())
00103    {
00104       Usb_select_endpoint(EP_MS_OUT);
00105       if (Is_usb_receive_out())
00106       {
00107          usb_mass_storage_cbw();
00108          usb_mass_storage_csw();
00109       }
00110    }
00111 }

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Variable Documentation

U8 usb_configuration_nb

Definition at line 71 of file usb_standard_request.c.

bit ms_data_direction [static]

Definition at line 50 of file storage_task.c.

_MEM_TYPE_SLOW_ U8 dCBWTag[4] [static]

Definition at line 51 of file storage_task.c.

Referenced by usb_mass_storage_cbw(), and usb_mass_storage_csw().

_MEM_TYPE_SLOW_ U8 g_scsi_status

Definition at line 35 of file scsi_decoder.c.

Referenced by usb_mass_storage_csw().

_MEM_TYPE_FAST_ U32 g_scsi_data_remaining

Definition at line 36 of file scsi_decoder.c.

Referenced by sbc_read_10(), sbc_write_10(), usb_mass_storage_cbw(), and usb_mass_storage_csw().

bit ms_multiple_drive

Definition at line 32 of file usb_specific_request.c.

Referenced by usb_mass_storage_cbw(), and usb_user_read_request().

_MEM_TYPE_SLOW_ U8 g_scsi_command[16]

Definition at line 34 of file scsi_decoder.c.

Referenced by sbc_inquiry(), sbc_mode_sense(), sbc_read_10(), sbc_request_sense(), sbc_write_10(), scsi_decode_command(), and usb_mass_storage_cbw().

_MEM_TYPE_SLOW_ U8 usb_LUN

Definition at line 59 of file storage_task.c.

Referenced by sbc_header_mode_sense(), sbc_read_10(), sbc_read_capacity(), sbc_test_unit_ready(), sbc_write_10(), and usb_mass_storage_cbw().


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