storage_task.c File Reference

#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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Functions

void usb_mass_storage_cbw (void)
void usb_mass_storage_csw (void)
void storage_task_init (void)
void storage_task (void)

Variables

U8 usb_configuration_nb
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]
U8 endpoint_status [MAX_EP_NB]
_MEM_TYPE_SLOW_ U8 usb_LUN

Detailed Description

This file manages the mass storage task.

Author:
Atmel Corporation: http://www.atmel.com
Support and FAQ: http://support.atmel.no/

Definition in file storage_task.c.

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}

Definition at line 143 of file storage_task.c.

References dCBWTag, endpoint_status, 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, MSK_EP_DIR, 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().

00144 {
00145 bit cbw_error;
00146 U8  c;
00147 U8  dummy;
00148 
00149    cbw_error = FALSE;
00150    Usb_select_endpoint(EP_MS_OUT);           
00151    if (0x55 != Usb_read_byte())
00152       { cbw_error = TRUE; } 
00153    if (0x53 != Usb_read_byte())
00154       { cbw_error = TRUE; } 
00155    if (0x42 != Usb_read_byte())
00156       { cbw_error = TRUE; } 
00157    if (0x43 != Usb_read_byte())
00158       { cbw_error = TRUE; } 
00159    if (cbw_error)
00160    {
00161       Usb_ack_receive_out();
00162       Usb_select_endpoint(EP_MS_IN);
00163       Usb_enable_stall_handshake();
00164       endpoint_status[(EP_MS_IN & MSK_EP_DIR)] = 0x01;
00165       return;
00166    }
00167 
00168    dCBWTag[0] = Usb_read_byte();             
00169    dCBWTag[1] = Usb_read_byte();
00170    dCBWTag[2] = Usb_read_byte();
00171    dCBWTag[3] = Usb_read_byte();
00172    
00173    LSB0(g_scsi_data_remaining) = Usb_read_byte();
00174    LSB1(g_scsi_data_remaining) = Usb_read_byte();
00175    LSB2(g_scsi_data_remaining) = Usb_read_byte();
00176    LSB3(g_scsi_data_remaining) = Usb_read_byte();
00177 
00178    if (Usb_read_byte() != 0x00)              
00179    {
00180       Usb_set_ms_data_direction_in();
00181    }
00182    else
00183    {
00184       Usb_set_ms_data_direction_out();
00185    }
00186 
00187    usb_LUN = Usb_read_byte();
00188 
00189    if (!ms_multiple_drive)
00190    {
00191       usb_LUN = get_cur_lun();
00192    }
00193 
00194    dummy      = Usb_read_byte();                // dummy CBWCBLength read
00195 
00196 
00197    for (c=0; c<16; c++)                         // store scsi_command
00198    {
00199       g_scsi_command[c] = Usb_read_byte();
00200    }
00201    Usb_ack_receive_out();
00202 
00203    if (Is_usb_ms_data_direction_in())
00204    {
00205       Usb_select_endpoint(EP_MS_IN);
00206    }
00207 
00208    if (TRUE != scsi_decode_command())
00209    {
00210       U8 ep;
00211       Usb_enable_stall_handshake();
00212       if (Is_usb_ms_data_direction_in())
00213       {
00214          ep = (EP_MS_IN & MSK_EP_DIR);
00215       }else{
00216          ep = (EP_MS_OUT & MSK_EP_DIR);
00217       }
00218       endpoint_status[ep] = 0x01;
00219    }
00220 }

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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 231 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_enabled, Is_usb_endpoint_stall_requested, Is_usb_receive_setup, Is_usb_write_enabled, LSB0, LSB1, LSB2, LSB3, usb_process_request(), Usb_select_endpoint, Usb_send_in, and Usb_write_byte.

Referenced by storage_task().

00232 {
00233    Usb_select_endpoint(EP_MS_IN);
00234    while (Is_usb_endpoint_stall_requested())
00235    {
00236       Usb_select_endpoint(EP_CONTROL);
00237       if (Is_usb_receive_setup())       { usb_process_request(); }
00238       Usb_select_endpoint(EP_MS_IN);
00239    }
00240 
00241    Usb_select_endpoint(EP_MS_OUT);
00242    while (Is_usb_endpoint_stall_requested())
00243    {
00244       Usb_select_endpoint(EP_CONTROL);
00245       if (Is_usb_receive_setup())       { usb_process_request(); }
00246       Usb_select_endpoint(EP_MS_OUT);
00247    }
00248 
00249 
00250    Usb_select_endpoint(EP_MS_IN);
00251    while(!Is_usb_write_enabled())
00252    {
00253       if(!Is_usb_endpoint_enabled())   return; // USB Reset
00254    }
00256    Usb_write_byte(0x55);                                 
00257    Usb_write_byte(0x53);                                 
00258    Usb_write_byte(0x42);                                 
00259    Usb_write_byte(0x53);                                 
00260 
00261    Usb_write_byte(dCBWTag[0]);
00262    Usb_write_byte(dCBWTag[1]);
00263    Usb_write_byte(dCBWTag[2]);
00264    Usb_write_byte(dCBWTag[3]);
00266    Usb_write_byte( LSB0(g_scsi_data_remaining) );
00267    Usb_write_byte( LSB1(g_scsi_data_remaining) );
00268    Usb_write_byte( LSB2(g_scsi_data_remaining) );
00269    Usb_write_byte( LSB3(g_scsi_data_remaining) );
00270 
00272    Usb_write_byte(g_scsi_status);                        
00273 
00274    Usb_send_in();
00275 }

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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 102 of file storage_task.c.

References df_mem_init().

00103 {
00104    df_mem_init();    // Init the hw/sw ressources required to drive the DF.
00105 }

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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 116 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.

00117 {
00118    if (Is_device_enumerated())
00119    {
00120       Usb_select_endpoint(EP_MS_OUT);
00121       if (Is_usb_receive_out())
00122       {
00123          usb_mass_storage_cbw();
00124          usb_mass_storage_csw();
00125       }
00126    }
00127 }

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Variable Documentation

U8 usb_configuration_nb

Definition at line 100 of file usb_standard_request.c.

Referenced by usb_device_task(), usb_get_configuration(), and usb_set_configuration().

bit ms_data_direction

Definition at line 77 of file storage_task.c.

_MEM_TYPE_SLOW_ U8 dCBWTag[4] [static]

Definition at line 78 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 60 of file scsi_decoder.c.

Referenced by usb_mass_storage_csw().

_MEM_TYPE_FAST_ U32 g_scsi_data_remaining

Definition at line 61 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 63 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 59 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().

U8 endpoint_status[MAX_EP_NB]

Definition at line 98 of file usb_standard_request.c.

Referenced by usb_clear_feature(), usb_get_status(), usb_mass_storage_cbw(), usb_process_request(), and usb_set_feature().

_MEM_TYPE_SLOW_ U8 usb_LUN

Definition at line 87 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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