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 dependency graph for storage_task.c:

Go to the source code of this file.

Functions

void usb_mass_storage_cbw (void)
void usb_mass_storage_csw (void)
void storage_task_init (void)
void storage_task (void)
void sof_action ()
 This function increments the cpt_sof counter each times the USB Start Of Frame interrupt subroutine is executed (1ms) Usefull to manage time delays.

Variables

volatile U8 cpt_sof
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 134 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().

00135 {
00136 bit cbw_error;
00137 U8  c;
00138 U8  dummy;
00139 
00140    cbw_error = FALSE;
00141    Usb_select_endpoint(EP_MS_OUT);           
00142    if (0x55 != Usb_read_byte())
00143       { cbw_error = TRUE; } 
00144    if (0x53 != Usb_read_byte())
00145       { cbw_error = TRUE; } 
00146    if (0x42 != Usb_read_byte())
00147       { cbw_error = TRUE; } 
00148    if (0x43 != Usb_read_byte())
00149       { cbw_error = TRUE; } 
00150    if (cbw_error)
00151    {
00152       Usb_ack_receive_out();
00153       Usb_select_endpoint(EP_MS_IN);
00154       Usb_enable_stall_handshake();
00155       endpoint_status[(EP_MS_IN & MSK_EP_DIR)] = 0x01;
00156       return;
00157    }
00158 
00159    dCBWTag[0] = Usb_read_byte();             
00160    dCBWTag[1] = Usb_read_byte();
00161    dCBWTag[2] = Usb_read_byte();
00162    dCBWTag[3] = Usb_read_byte();
00163    
00164    LSB0(g_scsi_data_remaining) = Usb_read_byte();
00165    LSB1(g_scsi_data_remaining) = Usb_read_byte();
00166    LSB2(g_scsi_data_remaining) = Usb_read_byte();
00167    LSB3(g_scsi_data_remaining) = Usb_read_byte();
00168 
00169    if (Usb_read_byte() != 0x00)              
00170    {
00171       Usb_set_ms_data_direction_in();
00172    }
00173    else
00174    {
00175       Usb_set_ms_data_direction_out();
00176    }
00177 
00178    usb_LUN = Usb_read_byte();
00179 
00180    if (!ms_multiple_drive)
00181    {
00182       usb_LUN = get_cur_lun();
00183    }
00184 
00185    dummy      = Usb_read_byte();                // dummy CBWCBLength read
00186 
00187 
00188    for (c=0; c<16; c++)                         // store scsi_command
00189    {
00190       g_scsi_command[c] = Usb_read_byte();
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       U8 ep;
00202       Usb_enable_stall_handshake();
00203       if (Is_usb_ms_data_direction_in())
00204       {
00205          ep = (EP_MS_IN & MSK_EP_DIR);
00206       }else{
00207          ep = (EP_MS_OUT & MSK_EP_DIR);
00208       }
00209       endpoint_status[ep] = 0x01;
00210    }
00211 }

Here is the call graph for this function:

Here is the caller graph for this function:

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 222 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().

00223 {
00224    Usb_select_endpoint(EP_MS_IN);
00225    while (Is_usb_endpoint_stall_requested())
00226    {
00227       Usb_select_endpoint(EP_CONTROL);
00228       if (Is_usb_receive_setup())       { usb_process_request(); }
00229       Usb_select_endpoint(EP_MS_IN);
00230    }
00231 
00232    Usb_select_endpoint(EP_MS_OUT);
00233    while (Is_usb_endpoint_stall_requested())
00234    {
00235       Usb_select_endpoint(EP_CONTROL);
00236       if (Is_usb_receive_setup())       { usb_process_request(); }
00237       Usb_select_endpoint(EP_MS_OUT);
00238    }
00239 
00240 
00241    Usb_select_endpoint(EP_MS_IN);
00242    while(!Is_usb_write_enabled())
00243    {
00244       if(!Is_usb_endpoint_enabled())   return; // USB Reset
00245    }
00247    Usb_write_byte(0x55);                                 
00248    Usb_write_byte(0x53);                                 
00249    Usb_write_byte(0x42);                                 
00250    Usb_write_byte(0x53);                                 
00251 
00252    Usb_write_byte(dCBWTag[0]);
00253    Usb_write_byte(dCBWTag[1]);
00254    Usb_write_byte(dCBWTag[2]);
00255    Usb_write_byte(dCBWTag[3]);
00257    Usb_write_byte( LSB0(g_scsi_data_remaining) );
00258    Usb_write_byte( LSB1(g_scsi_data_remaining) );
00259    Usb_write_byte( LSB2(g_scsi_data_remaining) );
00260    Usb_write_byte( LSB3(g_scsi_data_remaining) );
00261 
00263    Usb_write_byte(g_scsi_status);                        
00264 
00265    Usb_send_in();
00266 }

Here is the call graph for this function:

Here is the caller graph for this function:

void storage_task_init ( void   ) 

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

Parameters:
none 
Returns:
none
/

Definition at line 85 of file storage_task.c.

References df_mem_init(), Leds_init, and Usb_enable_sof_interrupt.

00086 {
00087    Leds_init();
00088    Usb_enable_sof_interrupt();
00089    df_mem_init();    // Init the hw/sw ressources required to drive the DF.
00090 }

Here is the call graph for this function:

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 101 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.

00102 {
00103    if (Is_device_enumerated())
00104    {
00105       Usb_select_endpoint(EP_MS_OUT);
00106       if (Is_usb_receive_out())
00107       {
00108          usb_mass_storage_cbw();
00109          usb_mass_storage_csw();
00110       }
00111    }
00112 }

Here is the call graph for this function:

Variable Documentation

volatile U8 cpt_sof

Definition at line 58 of file storage_task.c.

Referenced by sof_action().

bit ms_data_direction

Definition at line 60 of file storage_task.c.

_MEM_TYPE_SLOW_ U8 dCBWTag[4] [static]

Definition at line 61 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 57 of file scsi_decoder.c.

Referenced by usb_mass_storage_csw().

_MEM_TYPE_FAST_ U32 g_scsi_data_remaining

Definition at line 58 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 60 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 56 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 95 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 70 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().

Generated on Fri Oct 31 16:13:20 2008 for ATMEL by  doxygen 1.5.3