usb_standard_request.c File Reference

#include "config.h"
#include "conf_usb.h"
#include "lib_mcu/usb/usb_drv.h"
#include "lib_mcu/pll/pll_drv.h"
#include "usb_descriptors.h"
#include "modules/usb/device_chap9/usb_standard_request.h"
#include "usb_specific_request.h"
#include "lib_mcu/flash/flash_drv.h"

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Go to the source code of this file.

Defines

#define Usb_write_PGM_byte(byte)   (Usb_write_byte(*byte))

Functions

static U8 bin_to_ascii (U8 b)
 This function is used to convert a 4 bit number into an ascii character 5 => '5' 10 => 'A'.
static Bool usb_get_descriptor (void)
 This function manages the GET DESCRIPTOR request.
static void usb_set_address (void)
 This function manages the SET ADDRESS request.
static Bool usb_set_configuration (void)
 This function manages the SET CONFIGURATION request.
static void usb_get_configuration (void)
 This function manages the GET CONFIGURATION request.
static Bool usb_get_status (U8 bmRequestType)
 This function manages the GET STATUS request.
static Bool usb_set_feature (U8 bmRequestType)
 This function manages the SET FEATURE request.
static Bool usb_clear_feature (U8 bmRequestType)
 This function manages the SET FEATURE request.
static Bool usb_get_interface (void)
 This function manages the SETUP_GET_INTERFACE request.
static Bool usb_set_interface (void)
 This function manages the SETUP_SET_INTERFACE request.
void usb_process_request (void)
void usb_generate_remote_wakeup (void)
 This function manages the remote wake up generation.

Variables

U8 f_get_serial_string = FALSE
U8 code * pbuffer
U8 endpoint_status [MAX_EP_NB]
U8 data_to_transfer
U8 usb_configuration_nb
 Public : (U8) usb_configuration_nb Store the number of the USB configuration used by the USB device when its value is different from zero, it means the device mode is enumerated Used with USB_DEVICE_FEATURE == ENABLED only /.
U8 remote_wakeup_feature = DISABLE
 Public : (U8) remote_wakeup_feature Store a host request for remote wake up (set feature received) /.
static U8 device_status = DEVICE_STATUS


Detailed Description

Process USB device enumeration requests.

This file contains the USB endpoint 0 management routines corresponding to the standard enumeration process (refer to chapter 9 of the USB specification. This file calls routines of the usb_specific_request.c file for non-standard request management. The enumeration parameters (descriptor tables) are contained in the usb_descriptors.c file.

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

Definition in file usb_standard_request.c.


Define Documentation

#define Usb_write_PGM_byte ( byte   )     (Usb_write_byte(*byte))

Definition at line 95 of file usb_standard_request.c.

Referenced by usb_get_descriptor().


Function Documentation

U8 bin_to_ascii ( U8  b  )  [static]

This function is used to convert a 4 bit number into an ascii character 5 => '5' 10 => 'A'.

Parameters:
binary value to convert
Returns:
converted character

Definition at line 669 of file usb_standard_request.c.

Referenced by usb_get_descriptor().

00670 {
00671 return ( (b <= 0x09) ? (b+'0') : (b+'A'-10) );
00672 }

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Bool usb_get_descriptor ( void   )  [static]

This function manages the GET DESCRIPTOR request.

The device descriptor, the configuration descriptor and the device qualifier are supported. All other descriptors must be supported by the usb_user_get_descriptor function. Only 1 configuration is supported.

< sizeof (usb_user_device_descriptor);

< sizeof (usb_user_configuration_descriptor);

< don't care of wIndex field

< read wLength

< clear the receive setup flag

< send only requested number of data

< Send data until necessary

< Check endpoint 0 size

Definition at line 246 of file usb_standard_request.c.

References bin_to_ascii(), data_to_transfer, DESCRIPTOR_CONFIGURATION, DESCRIPTOR_DEVICE, EP_CONTROL_LENGTH, f_get_serial_string, FALSE, Flash_read_sn, Is_usb_nak_out_sent, Is_usb_read_control_enabled, Is_usb_vbus_low, LSB, MSB, pbuffer, TRUE, Usb_ack_control_out, Usb_ack_nak_out, Usb_ack_receive_setup, Usb_get_conf_desc_length, Usb_get_conf_desc_pointer, Usb_get_dev_desc_length, Usb_get_dev_desc_pointer, Usb_read_byte, Usb_send_control_in, usb_user_get_descriptor(), Usb_write_byte, and Usb_write_PGM_byte.

Referenced by usb_process_request().

00247 {
00248    Bool zlp;
00249    U16  wLength;
00250    U8   descriptor_type ;
00251    U8   string_type;
00252    U8   dummy;
00253    U8   nb_byte;
00254    U8   byte_to_send;
00255 #if (USE_DEVICE_SN_UNIQUE==ENABLE)
00256    U16  sn_index=0;
00257    U8   initial_data_to_transfer;
00258 #endif
00259     
00260    zlp             = FALSE;                  /* no zero length packet */
00261    string_type     = Usb_read_byte();        /* read LSB of wValue    */
00262    descriptor_type = Usb_read_byte();        /* read MSB of wValue    */
00263 
00264    switch (descriptor_type)
00265    {
00266       case DESCRIPTOR_DEVICE:
00267       data_to_transfer = Usb_get_dev_desc_length(); 
00268       pbuffer          = Usb_get_dev_desc_pointer();
00269       break;
00270       
00271       case DESCRIPTOR_CONFIGURATION:
00272       data_to_transfer = Usb_get_conf_desc_length(); 
00273       pbuffer          = Usb_get_conf_desc_pointer();
00274       break;
00275       
00276       default:
00277       if( !usb_user_get_descriptor(descriptor_type, string_type))
00278          return FALSE;  // Unknow descriptor then stall request
00279       break;
00280    }
00281 
00282    dummy = Usb_read_byte();                     
00283    dummy = Usb_read_byte();
00284    LSB(wLength) = Usb_read_byte();              
00285    MSB(wLength) = Usb_read_byte();
00286    Usb_ack_receive_setup() ;                  
00287 
00288    if (wLength > data_to_transfer)
00289    {
00290       if ((data_to_transfer % EP_CONTROL_LENGTH) == 0) { zlp = TRUE; }
00291       else { zlp = FALSE; }                   
00292    }
00293    else
00294    {
00295       data_to_transfer = (U8)wLength;         
00296    }
00297 
00298    Usb_ack_nak_out();
00299     
00300    byte_to_send=0;
00301 #if (USE_DEVICE_SN_UNIQUE==ENABLE)
00302    initial_data_to_transfer = data_to_transfer;
00303 #endif
00304    while((data_to_transfer != 0) && (!Is_usb_nak_out_sent()))
00305    {
00306       while(!Is_usb_read_control_enabled())
00307       {
00308          if (Is_usb_nak_out_sent())
00309             break;    // don't clear the flag now, it will be cleared after
00310          if (Is_usb_vbus_low())
00311             break;          
00312       }
00313               
00314       nb_byte=0;
00315       while(data_to_transfer != 0)        
00316       {
00317          if(nb_byte++==EP_CONTROL_LENGTH) 
00318             break;         
00319          
00320 #if (USE_DEVICE_SN_UNIQUE==ENABLE)
00321 
00322          if(f_get_serial_string && (data_to_transfer < (initial_data_to_transfer-1)))    //if we are sending the signature characters (third byte and more...)
00323          {                                                                              //(The first two bytes are the length and the descriptor)
00324             
00325             switch (byte_to_send)
00326             {
00327                case 0:
00328                Usb_write_byte(bin_to_ascii((Flash_read_sn(sn_index)>>4) & 0x0F)); //sends the fist part (MSB) of the signature hex number, converted in ascii
00329                break;
00330               
00331                case 1:
00332                Usb_write_byte(0);                                                   //then, sends a null character (Usb_unicode)                    
00333                break;
00334     
00335                case 2:
00336                Usb_write_byte(bin_to_ascii(Flash_read_sn(sn_index) & 0x0F));      //sends the second part (LSB) of the signature hex number, converted in ascii 
00337                break;
00338     
00339                case 3:
00340                Usb_write_byte(0);                                                   //then, sends a null character (Usb_unicode)  
00341                sn_index++;                                                         //increments the signature address pointer.
00342                break;
00343             }
00344             byte_to_send = (byte_to_send+1)%4;     
00345          }
00346          else
00347          {
00348             Usb_write_PGM_byte(pbuffer++);                                                 //Write a flash byte to USB        
00349          }        
00350 #else          
00351          Usb_write_PGM_byte(pbuffer++);          
00352 #endif
00353          data_to_transfer --;                                                             //decrements the number of bytes to transmit.
00354       }
00355       
00356       if (Is_usb_nak_out_sent())
00357          break;
00358       if (Is_usb_vbus_low())
00359          break;
00360       Usb_send_control_in();
00361    }
00362    
00363 #if (USE_DEVICE_SN_UNIQUE==ENABLE)      
00364    f_get_serial_string=FALSE;                                                   //end of signature transmission    
00365 #endif   
00366 
00367    if((zlp == TRUE) && (!Is_usb_nak_out_sent()))
00368    {
00369       while(!Is_usb_read_control_enabled()) {if(Is_usb_vbus_low())break;}
00370       Usb_send_control_in();
00371    }
00372 
00373    while (!(Is_usb_nak_out_sent())) {if(Is_usb_vbus_low())break;}
00374    Usb_ack_nak_out();
00375    Usb_ack_control_out();
00376    return TRUE;
00377 }

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void usb_set_address ( void   )  [static]

This function manages the SET ADDRESS request.

When complete, the device will filter the requests using the new address.

Definition at line 203 of file usb_standard_request.c.

References Is_usb_in_ready, Is_usb_vbus_low, Usb_ack_receive_setup, Usb_configure_address, Usb_enable_address, Usb_read_byte, and Usb_send_control_in.

Referenced by usb_process_request().

00204 {
00205    U8 addr = Usb_read_byte();
00206    Usb_configure_address(addr);
00207 
00208    Usb_ack_receive_setup();
00209 
00210    Usb_send_control_in();                    // send a ZLP for STATUS phase
00211    while(!Is_usb_in_ready()) {if(Is_usb_vbus_low())break;} // waits for status phase done
00212                                              // before using the new address
00213    Usb_enable_address();
00214 }

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Bool usb_set_configuration ( void   )  [static]

This function manages the SET CONFIGURATION request.

If the selected configuration is valid, this function call the usb_user_endpoint_init() function that will configure the endpoints following the configuration number.

Definition at line 222 of file usb_standard_request.c.

References FALSE, NB_CONFIGURATION, TRUE, Usb_ack_receive_setup, usb_configuration_nb, Usb_read_byte, Usb_send_control_in, Usb_set_configuration_action, and usb_user_endpoint_init().

Referenced by usb_process_request().

00223 {
00224    U8 configuration_number;
00225 
00226    // Get/Check new configuration
00227    configuration_number = Usb_read_byte();
00228    if (configuration_number > NB_CONFIGURATION)
00229       return FALSE;  //  Bad configuration number then stall request
00230    Usb_ack_receive_setup();
00231    usb_configuration_nb = configuration_number;
00232    
00233    Usb_send_control_in();                          // send a ZLP for STATUS phase
00234    usb_user_endpoint_init(usb_configuration_nb);   // endpoint configuration
00235    Usb_set_configuration_action();
00236    return TRUE;
00237 }

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void usb_get_configuration ( void   )  [static]

This function manages the GET CONFIGURATION request.

The current configuration number is returned.

Definition at line 383 of file usb_standard_request.c.

References Is_usb_receive_out, Is_usb_vbus_low, Usb_ack_in_ready, Usb_ack_receive_out, Usb_ack_receive_setup, usb_configuration_nb, and Usb_write_byte.

Referenced by usb_process_request().

00384 {
00385    Usb_ack_receive_setup();
00386 
00387    Usb_write_byte(usb_configuration_nb);
00388    Usb_ack_in_ready();
00389 
00390    while( !Is_usb_receive_out() ){if(Is_usb_vbus_low())break;}
00391    Usb_ack_receive_out();
00392 }

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Bool usb_get_status ( U8  bmRequestType  )  [static]

This function manages the GET STATUS request.

The device, interface or endpoint status is returned.

< dummy read

< dummy read

Definition at line 398 of file usb_standard_request.c.

References device_status, endpoint_status, FALSE, Is_usb_receive_out, Is_usb_vbus_low, MSK_EP_DIR, TRUE, Usb_ack_receive_out, Usb_ack_receive_setup, Usb_read_byte, Usb_send_control_in, USB_SETUP_GET_STAND_DEVICE, USB_SETUP_GET_STAND_ENDPOINT, USB_SETUP_GET_STAND_INTERFACE, and Usb_write_byte.

Referenced by usb_process_request().

00399 {
00400    U8 wIndex;
00401    U8 dummy;
00402 
00403    dummy    = Usb_read_byte();                 
00404    dummy    = Usb_read_byte();                 
00405    wIndex   = Usb_read_byte();
00406 
00407    switch(bmRequestType)
00408    {
00409       case USB_SETUP_GET_STAND_DEVICE:
00410       Usb_ack_receive_setup();
00411       Usb_write_byte(device_status);
00412       break;
00413 
00414       case USB_SETUP_GET_STAND_INTERFACE:
00415       Usb_ack_receive_setup();
00416       Usb_write_byte(0);      // Reserved - always 0
00417       break;
00418 
00419       case USB_SETUP_GET_STAND_ENDPOINT:
00420       Usb_ack_receive_setup();
00421       wIndex = wIndex & MSK_EP_DIR;
00422       Usb_write_byte( endpoint_status[wIndex] );
00423       break;
00424     
00425       default:
00426       return FALSE;
00427    }
00428    Usb_write_byte(0);
00429 
00430    Usb_send_control_in();
00431    while( !Is_usb_receive_out() ){if(Is_usb_vbus_low())break;}
00432    Usb_ack_receive_out();
00433    return TRUE;
00434 }

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Bool usb_set_feature ( U8  bmRequestType  )  [static]

This function manages the SET FEATURE request.

The USB test modes are supported by this function.

< dummy read

Definition at line 440 of file usb_standard_request.c.

References BDEV_HNP_NB_RETRY, device_status, DISABLED, ENABLED, endpoint_status, EP_CONTROL, FALSE, FEATURE_DEVICE_REMOTE_WAKEUP, FEATURE_ENDPOINT_HALT, HNP_SUPPORT, Is_usb_endpoint_enabled, MSK_EP_DIR, OTG_A_ALT_HNP_SUPPORT, OTG_A_HNP_SUPPORT, OTG_B_HNP_ENABLE, otg_features_supported, remote_wakeup_feature, TRUE, Usb_ack_receive_setup, USB_DEVICE_STATUS_REMOTEWAKEUP, Usb_enable_stall_handshake, Usb_read_byte, USB_REMOTE_WAKEUP, USB_REMOTE_WAKEUP_FEATURE, Usb_select_endpoint, Usb_send_control_in, USB_SETUP_SET_STAND_DEVICE, USB_SETUP_SET_STAND_ENDPOINT, and USB_SETUP_SET_STAND_INTERFACE.

Referenced by usb_process_request().

00441 {
00442    U8 wValue;
00443    U8 wIndex;
00444    U8 dummy;
00445 
00446    switch (bmRequestType)
00447    {
00448       case USB_SETUP_SET_STAND_DEVICE:
00449       wValue = Usb_read_byte();
00450       switch (wValue)
00451       {
00452          case USB_REMOTE_WAKEUP:
00453          if ((wValue != FEATURE_DEVICE_REMOTE_WAKEUP)
00454          ||  (USB_REMOTE_WAKEUP_FEATURE != ENABLED))
00455             return FALSE;              // Invalid request
00456          device_status |= USB_DEVICE_STATUS_REMOTEWAKEUP;
00457          remote_wakeup_feature = ENABLED;
00458          Usb_ack_receive_setup();
00459          Usb_send_control_in();
00460          break;
00461 
00462 #if (USB_OTG_FEATURE == ENABLED)
00463          case OTG_B_HNP_ENABLE:
00464          if (((OTG_BMATTRIBUTES&HNP_SUPPORT) == 0) || (USB_OTG_FEATURE == DISABLED))   // see usb_descriptors.h
00465             return FALSE;              // Invalid request
00466          otg_features_supported |= OTG_B_HNP_ENABLE;
00467          otg_device_nb_hnp_retry = BDEV_HNP_NB_RETRY;
00468          Usb_ack_receive_setup();
00469          Usb_send_control_in();
00470          break;
00471 
00472          case OTG_A_HNP_SUPPORT:
00473          if (((OTG_BMATTRIBUTES&HNP_SUPPORT) == 0) || (USB_OTG_FEATURE == DISABLED))
00474             return FALSE;              // Invalid request
00475          otg_features_supported |= OTG_A_HNP_SUPPORT;
00476          Usb_ack_receive_setup();
00477          Usb_send_control_in();
00478          break;
00479 
00480          case OTG_A_ALT_HNP_SUPPORT:
00481          if (((OTG_BMATTRIBUTES&HNP_SUPPORT) == 0) || (USB_OTG_FEATURE == DISABLED))
00482             return FALSE;              // Invalid request
00483          otg_features_supported |= OTG_A_ALT_HNP_SUPPORT;
00484          Usb_ack_receive_setup();
00485          Usb_send_control_in();
00486          break;
00487 #endif
00488             
00489          default:
00490          return FALSE;                 // Unknow request
00491          break;
00492       }
00493       break;
00494 
00495       case USB_SETUP_SET_STAND_INTERFACE:
00496       return FALSE;                    // Unknow request
00497       break;
00498 
00499       case USB_SETUP_SET_STAND_ENDPOINT:
00500       wValue   = Usb_read_byte();
00501       dummy    = Usb_read_byte();                
00502       if (wValue != FEATURE_ENDPOINT_HALT)
00503          return FALSE;                 // Unknow request
00504       wIndex = (Usb_read_byte() & MSK_EP_DIR);
00505       if (wIndex == EP_CONTROL)
00506       {
00507          Usb_enable_stall_handshake();
00508          Usb_ack_receive_setup();
00509       }
00510       Usb_select_endpoint(wIndex);
00511       if( !Is_usb_endpoint_enabled())
00512       {
00513          Usb_select_endpoint(EP_CONTROL);
00514          return FALSE;              // Invalid request
00515       }
00516       Usb_enable_stall_handshake();
00517       Usb_select_endpoint(EP_CONTROL);
00518       endpoint_status[wIndex] = 0x01;
00519       Usb_ack_receive_setup();
00520       Usb_send_control_in();
00521       break;
00522 
00523       default:
00524       return FALSE;                    // Unknow request
00525       break;
00526    }
00527    return TRUE;
00528 }

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Bool usb_clear_feature ( U8  bmRequestType  )  [static]

This function manages the SET FEATURE request.

Definition at line 533 of file usb_standard_request.c.

References device_status, DISABLED, ENABLED, endpoint_status, EP_CONTROL, FALSE, FEATURE_DEVICE_REMOTE_WAKEUP, FEATURE_ENDPOINT_HALT, Is_usb_endpoint_enabled, MSK_EP_DIR, remote_wakeup_feature, TRUE, Usb_ack_receive_setup, USB_DEVICE_STATUS_REMOTEWAKEUP, Usb_disable_stall_handshake, Usb_read_byte, USB_REMOTE_WAKEUP_FEATURE, Usb_reset_data_toggle, Usb_reset_endpoint, Usb_select_endpoint, Usb_send_control_in, USB_SETUP_SET_STAND_DEVICE, USB_SETUP_SET_STAND_ENDPOINT, and USB_SETUP_SET_STAND_INTERFACE.

Referenced by usb_process_request().

00534 {
00535    U8 wValue;
00536    U8 wIndex;
00537    U8 dummy;
00538 
00539    switch (bmRequestType)
00540    {
00541       case  USB_SETUP_SET_STAND_DEVICE:
00542       wValue = Usb_read_byte();
00543       if ((wValue != FEATURE_DEVICE_REMOTE_WAKEUP) || (USB_REMOTE_WAKEUP_FEATURE != ENABLED))
00544          return FALSE;              // Invalid request
00545       device_status &= ~USB_DEVICE_STATUS_REMOTEWAKEUP;
00546       remote_wakeup_feature = DISABLED;
00547       Usb_ack_receive_setup();
00548       Usb_send_control_in();
00549       break;
00550    
00551       case USB_SETUP_SET_STAND_INTERFACE:
00552       return FALSE;                    // Unknow request
00553       break;
00554       
00555       case USB_SETUP_SET_STAND_ENDPOINT:
00556       wValue = Usb_read_byte();
00557       dummy  = Usb_read_byte();
00558       if (wValue != FEATURE_ENDPOINT_HALT)
00559          return FALSE;                 // Unknow request
00560       wIndex = (Usb_read_byte() & MSK_EP_DIR);
00561       Usb_select_endpoint(wIndex);
00562       if( !Is_usb_endpoint_enabled())
00563       {
00564          Usb_select_endpoint(EP_CONTROL);
00565          return FALSE;              // Invalid request
00566       } 
00567       if(wIndex != EP_CONTROL)
00568       {
00569          Usb_disable_stall_handshake();
00570          Usb_reset_endpoint(wIndex);
00571          Usb_reset_data_toggle();
00572       }
00573       Usb_select_endpoint(EP_CONTROL);
00574       endpoint_status[wIndex] = 0x00;
00575       Usb_ack_receive_setup();
00576       Usb_send_control_in();
00577       break;
00578    
00579       default:
00580       return FALSE;                    // Unknow request
00581       break;
00582    }
00583    return TRUE;
00584 }

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Bool usb_get_interface ( void   )  [static]

This function manages the SETUP_GET_INTERFACE request.

Definition at line 589 of file usb_standard_request.c.

References FALSE, Is_usb_receive_out, Is_usb_vbus_low, LSB, MSB, TRUE, Usb_ack_receive_out, Usb_ack_receive_setup, Usb_read_byte, Usb_send_control_in, usb_user_interface_get(), and Usb_write_byte.

Referenced by usb_process_request().

00590 {
00591    U16   wInterface;
00592    U8    wValue_msb;
00593    U8    wValue_lsb;
00594 
00595    // Read wValue
00596    wValue_lsb = Usb_read_byte();
00597    wValue_msb = Usb_read_byte();
00598    // wValue = Alternate Setting
00599    // wIndex = Interface
00600    LSB(wInterface)=Usb_read_byte();
00601    MSB(wInterface)=Usb_read_byte();
00602    if( (0!=wValue_msb) || (0!=wValue_msb) )
00603       return FALSE;
00604    Usb_ack_receive_setup();
00605    
00606    Usb_write_byte( usb_user_interface_get(wInterface) );
00607    Usb_send_control_in();
00608 
00609    while( !Is_usb_receive_out() ){if(Is_usb_vbus_low())break;}
00610    Usb_ack_receive_out();
00611    return TRUE;
00612 }

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Bool usb_set_interface ( void   )  [static]

This function manages the SETUP_SET_INTERFACE request.

Definition at line 617 of file usb_standard_request.c.

References EP_CONTROL, FALSE, Is_usb_in_ready, Is_usb_vbus_low, LSB, MSB, TRUE, Usb_ack_receive_setup, Usb_read_byte, Usb_select_endpoint, Usb_send_control_in, and usb_user_interface_reset().

Referenced by usb_process_request().

00618 {
00619    U16   wInterface;
00620    U8    wValue_msb;
00621    U8    wValue_lsb;
00622 
00623    // Read wValue
00624    wValue_lsb = Usb_read_byte();
00625    wValue_msb = Usb_read_byte();
00626    // wValue = Alternate Setting
00627    // wIndex = Interface
00628    LSB(wInterface)=Usb_read_byte();
00629    MSB(wInterface)=Usb_read_byte();
00630    if( 0!=wValue_msb )
00631       return FALSE;
00632    Usb_ack_receive_setup();
00633    
00634    usb_user_interface_reset(wInterface, wValue_lsb);
00635    Usb_select_endpoint(EP_CONTROL);
00636             
00637    Usb_send_control_in();
00638    while(!Is_usb_in_ready()) {if(Is_usb_vbus_low())break;}
00639    return TRUE;
00640 }

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Variable Documentation

U8 code* pbuffer

Definition at line 94 of file usb_standard_request.c.

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_process_request(), and usb_set_feature().

U8 data_to_transfer

Definition at line 99 of file usb_standard_request.c.

U8 device_status = DEVICE_STATUS [static]

Definition at line 102 of file usb_standard_request.c.

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


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