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"

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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 137 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().

00138 {
00139 bit cbw_error;
00140 U8  c;
00141 U8  dummy;
00142 
00143    cbw_error = FALSE;
00144    Usb_select_endpoint(EP_MS_OUT);           
00145    if (0x55 != Usb_read_byte())
00146       { cbw_error = TRUE; } 
00147    if (0x53 != Usb_read_byte())
00148       { cbw_error = TRUE; } 
00149    if (0x42 != Usb_read_byte())
00150       { cbw_error = TRUE; } 
00151    if (0x43 != Usb_read_byte())
00152       { cbw_error = TRUE; } 
00153    if (cbw_error)
00154    {
00155       Usb_ack_receive_out();
00156       Usb_select_endpoint(EP_MS_IN);
00157       Usb_enable_stall_handshake();
00158       endpoint_status[(EP_MS_IN & MSK_EP_DIR)] = 0x01;
00159       return;
00160    }
00161 
00162    dCBWTag[0] = Usb_read_byte();             
00163    dCBWTag[1] = Usb_read_byte();
00164    dCBWTag[2] = Usb_read_byte();
00165    dCBWTag[3] = Usb_read_byte();
00166    
00167    LSB0(g_scsi_data_remaining) = Usb_read_byte();
00168    LSB1(g_scsi_data_remaining) = Usb_read_byte();
00169    LSB2(g_scsi_data_remaining) = Usb_read_byte();
00170    LSB3(g_scsi_data_remaining) = Usb_read_byte();
00171 
00172    if (Usb_read_byte() != 0x00)              
00173    {
00174       Usb_set_ms_data_direction_in();
00175    }
00176    else
00177    {
00178       Usb_set_ms_data_direction_out();
00179    }
00180 
00181    usb_LUN = Usb_read_byte();
00182 
00183    if (!ms_multiple_drive)
00184    {
00185       usb_LUN = get_cur_lun();
00186    }
00187 
00188    dummy      = Usb_read_byte();                // dummy CBWCBLength read
00189 
00190 
00191    for (c=0; c<16; c++)                         // store scsi_command
00192    {
00193       g_scsi_command[c] = Usb_read_byte();
00194    }
00195    Usb_ack_receive_out();
00196 
00197    if (Is_usb_ms_data_direction_in())
00198    {
00199       Usb_select_endpoint(EP_MS_IN);
00200    }
00201 
00202    if (TRUE != scsi_decode_command())
00203    {
00204       U8 ep;
00205       Usb_enable_stall_handshake();
00206       if (Is_usb_ms_data_direction_in())
00207       {
00208          ep = (EP_MS_IN & MSK_EP_DIR);
00209       }else{
00210          ep = (EP_MS_OUT & MSK_EP_DIR);
00211       }
00212       endpoint_status[ep] = 0x01;
00213    }
00214 }

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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 225 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().

00226 {
00227    Usb_select_endpoint(EP_MS_IN);
00228    while (Is_usb_endpoint_stall_requested())
00229    {
00230       Usb_select_endpoint(EP_CONTROL);
00231       if (Is_usb_receive_setup())       { usb_process_request(); }
00232       Usb_select_endpoint(EP_MS_IN);
00233    }
00234 
00235    Usb_select_endpoint(EP_MS_OUT);
00236    while (Is_usb_endpoint_stall_requested())
00237    {
00238       Usb_select_endpoint(EP_CONTROL);
00239       if (Is_usb_receive_setup())       { usb_process_request(); }
00240       Usb_select_endpoint(EP_MS_OUT);
00241    }
00242 
00243 
00244    Usb_select_endpoint(EP_MS_IN);
00245    while(!Is_usb_write_enabled())
00246    {
00247       if(!Is_usb_endpoint_enabled())   return; // USB Reset
00248    }
00250    Usb_write_byte(0x55);                                 
00251    Usb_write_byte(0x53);                                 
00252    Usb_write_byte(0x42);                                 
00253    Usb_write_byte(0x53);                                 
00254 
00255    Usb_write_byte(dCBWTag[0]);
00256    Usb_write_byte(dCBWTag[1]);
00257    Usb_write_byte(dCBWTag[2]);
00258    Usb_write_byte(dCBWTag[3]);
00260    Usb_write_byte( LSB0(g_scsi_data_remaining) );
00261    Usb_write_byte( LSB1(g_scsi_data_remaining) );
00262    Usb_write_byte( LSB2(g_scsi_data_remaining) );
00263    Usb_write_byte( LSB3(g_scsi_data_remaining) );
00264 
00266    Usb_write_byte(g_scsi_status);                        
00267 
00268    Usb_send_in();
00269 }

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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 88 of file storage_task.c.

References df_mem_init(), Leds_init, and Usb_enable_sof_interrupt.

00089 {
00090    Leds_init();
00091    Usb_enable_sof_interrupt();
00092    df_mem_init();    // Init the hw/sw ressources required to drive the DF.
00093 }

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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 104 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.

00105 {
00106    if (Is_device_enumerated())
00107    {
00108       Usb_select_endpoint(EP_MS_OUT);
00109       if (Is_usb_receive_out())
00110       {
00111          usb_mass_storage_cbw();
00112          usb_mass_storage_csw();
00113       }
00114    }
00115 }

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Variable Documentation

volatile U8 cpt_sof

Definition at line 61 of file storage_task.c.

Referenced by sof_action().

bit ms_data_direction

Definition at line 63 of file storage_task.c.

_MEM_TYPE_SLOW_ U8 dCBWTag[4] [static]

Definition at line 64 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 73 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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