/******************************************************************** FileName: usb_descriptors.c Dependencies: See INCLUDES section Processor: PIC18 or PIC24 USB Microcontrollers Hardware: The code is natively intended to be used on the following hardware platforms: PICDEM™ FS USB Demo Board, PIC18F87J50 FS USB Plug-In Module, or Explorer 16 + PIC24 USB PIM. The firmware may be modified for use on other USB platforms by editing the HardwareProfile.h file. Complier: Microchip C18 (for PIC18) or C30 (for PIC24) Company: Microchip Technology, Inc. Software License Agreement: The software supplied herewith by Microchip Technology Incorporated (the “Company”) for its PIC® Microcontroller is intended and supplied to you, the Company’s customer, for use solely and exclusively on Microchip PIC Microcontroller products. The software is owned by the Company and/or its supplier, and is protected under applicable copyright laws. All rights are reserved. Any use in violation of the foregoing restrictions may subject the user to criminal sanctions under applicable laws, as well as to civil liability for the breach of the terms and conditions of this license. THIS SOFTWARE IS PROVIDED IN AN “AS IS” CONDITION. NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. ********************************************************************* -usb_descriptors.c- ------------------------------------------------------------------- Filling in the descriptor values in the usb_descriptors.c file: ------------------------------------------------------------------- [Device Descriptors] The device descriptor is defined as a USB_DEVICE_DESCRIPTOR type. This type is defined in usb_ch9.h Each entry into this structure needs to be the correct length for the data type of the entry. [Configuration Descriptors] The configuration descriptor was changed in v2.x from a structure to a BYTE array. Given that the configuration is now a byte array each byte of multi-byte fields must be listed individually. This means that for fields like the total size of the configuration where the field is a 16-bit value "64,0," is the correct entry for a configuration that is only 64 bytes long and not "64," which is one too few bytes. The configuration attribute must always have the _DEFAULT definition at the minimum. Additional options can be ORed to the _DEFAULT attribute. Available options are _SELF and _RWU. These definitions are defined in the usb_device.h file. The _SELF tells the USB host that this device is self-powered. The _RWU tells the USB host that this device supports Remote Wakeup. [Endpoint Descriptors] Like the configuration descriptor, the endpoint descriptors were changed in v2.x of the stack from a structure to a BYTE array. As endpoint descriptors also has a field that are multi-byte entities, please be sure to specify both bytes of the field. For example, for the endpoint size an endpoint that is 64 bytes needs to have the size defined as "64,0," instead of "64," Take the following example: // Endpoint Descriptor // 0x07, //the size of this descriptor // USB_DESCRIPTOR_ENDPOINT, //Endpoint Descriptor _EP02_IN, //EndpointAddress _INT, //Attributes 0x08,0x00, //size (note: 2 bytes) 0x02, //Interval The first two parameters are self-explanatory. They specify the length of this endpoint descriptor (7) and the descriptor type. The next parameter identifies the endpoint, the definitions are defined in usb_device.h and has the following naming convention: _EP<##>_ where ## is the endpoint number and dir is the direction of transfer. The dir has the value of either 'OUT' or 'IN'. The next parameter identifies the type of the endpoint. Available options are _BULK, _INT, _ISO, and _CTRL. The _CTRL is not typically used because the default control transfer endpoint is not defined in the USB descriptors. When _ISO option is used, addition options can be ORed to _ISO. Example: _ISO|_AD|_FE This describes the endpoint as an isochronous pipe with adaptive and feedback attributes. See usb_device.h and the USB specification for details. The next parameter defines the size of the endpoint. The last parameter in the polling interval. ------------------------------------------------------------------- Adding a USB String ------------------------------------------------------------------- A string descriptor array should have the following format: rom struct{byte bLength;byte bDscType;word string[size];}sdxxx={ sizeof(sdxxx),DSC_STR,}; The above structure provides a means for the C compiler to calculate the length of string descriptor sdxxx, where xxx is the index number. The first two bytes of the descriptor are descriptor length and type. The rest are string texts which must be in the unicode format. The unicode format is achieved by declaring each character as a word type. The whole text string is declared as a word array with the number of characters equals to . has to be manually counted and entered into the array declaration. Let's study this through an example: if the string is "USB" , then the string descriptor should be: (Using index 02) rom struct{byte bLength;byte bDscType;word string[3];}sd002={ sizeof(sd002),DSC_STR,'U','S','B'}; A USB project may have multiple strings and the firmware supports the management of multiple strings through a look-up table. The look-up table is defined as: rom const unsigned char *rom USB_SD_Ptr[]={&sd000,&sd001,&sd002}; The above declaration has 3 strings, sd000, sd001, and sd002. Strings can be removed or added. sd000 is a specialized string descriptor. It defines the language code, usually this is US English (0x0409). The index of the string must match the index position of the USB_SD_Ptr array, &sd000 must be in position USB_SD_Ptr[0], &sd001 must be in position USB_SD_Ptr[1] and so on. The look-up table USB_SD_Ptr is used by the get string handler function. ------------------------------------------------------------------- The look-up table scheme also applies to the configuration descriptor. A USB device may have multiple configuration descriptors, i.e. CFG01, CFG02, etc. To add a configuration descriptor, user must implement a structure similar to CFG01. The next step is to add the configuration descriptor name, i.e. cfg01, cfg02,.., to the look-up table USB_CD_Ptr. USB_CD_Ptr[0] is a dummy place holder since configuration 0 is the un-configured state according to the definition in the USB specification. ********************************************************************/ /********************************************************************* * Descriptor specific type definitions are defined in: * usb_device.h * * Configuration options are defined in: * usb_config.h ********************************************************************/ #ifndef __USB_DESCRIPTORS_C #define __USB_DESCRIPTORS_C /** INCLUDES *******************************************************/ #include "USB/usb.h" #include "USB/usb_function_generic.h" #include "HardwareProfile.h" #if VENDOR_ID == 1234 #error hardware id not set. see usb_config.h #endif /** CONSTANTS ******************************************************/ #if defined(__18CXX) #pragma romdata #endif /* Device Descriptor */ ROM USB_DEVICE_DESCRIPTOR device_dsc= { 0x12, // Size of this descriptor in bytes USB_DESCRIPTOR_DEVICE, // DEVICE descriptor type 0x0200, // USB Spec Release Number in BCD format 0x00, // Class Code 0x00, // Subclass code 0x00, // Protocol code USB_EP0_BUFF_SIZE, // Max packet size for EP0, (see usb_config.h) VENDOR_ID, // Vendor ID (see usb_config.h) PRODUCT_ID, // Product ID (see usb_config.h) BCD_RELEASE_NUMBER, // Device release number in BCD format (see usb_config.h) 0x01, // Manufacturer string index 0x02, // Product string index 0x03, // Device serial number string index 0x01 // Number of possible configurations }; #if !defined(DUAL_INTERFACE) /* Configuration 1 Descriptor */ ROM BYTE configDescriptor1[]={ /* Configuration Descriptor */ 0x09,//sizeof(USB_CFG_DSC), // Size of this descriptor in bytes USB_DESCRIPTOR_CONFIGURATION, // CONFIGURATION descriptor type 0x2E,0x00, // Total length of data for this cfg 1, // Number of interfaces in this cfg 1, // Index value of this configuration 0, // Configuration string index _DEFAULT | _SELF, // Attributes, see usb_device.h 50, // Max power consumption (2X mA) /* Interface Descriptor */ 0x09,//sizeof(USB_INTF_DSC), // Size of this descriptor in bytes USB_DESCRIPTOR_INTERFACE, // INTERFACE descriptor type 0, // Interface Number 0, // Alternate Setting Number 4, // Number of endpoints in this intf 0xFF, // Class code 0xFF, // Subclass code 0xFF, // Protocol code 0, // Interface string index 0x07, // Endpoint descriptor size USB_DESCRIPTOR_ENDPOINT, // Endpoint descriptor USBGEN_EP_NUM_INTF0_1, // Endpoint address USBGEN_EP_ATTRIBUTES_INTF0_1, // Endpoint Attributes DESC_CONFIG_WORD(USBGEN_EP_SIZE_INTF0), // Endpoint Size 32, // Endpoint Interval 0x07, // Endpoint descriptor size USB_DESCRIPTOR_ENDPOINT, // Endpoint descriptor USBGEN_EP_NUM_INTF0_1|0x80, // Endpoint address USBGEN_EP_ATTRIBUTES_INTF0_1, // Endpoint Attributes DESC_CONFIG_WORD(USBGEN_EP_SIZE_INTF0), // Endpoint Size 32, // Endpoint Interval 0x07, // Endpoint descriptor size USB_DESCRIPTOR_ENDPOINT, // Endpoint descriptor USBGEN_EP_NUM_INTF0_2, // Endpoint address USBGEN_EP_ATTRIBUTES_INTF0_2, // Endpoint Attributes DESC_CONFIG_WORD(USBGEN_EP_SIZE_INTF0), // Endpoint Size 32, // Endpoint Interval 0x07, // Endpoint descriptor size USB_DESCRIPTOR_ENDPOINT, // Endpoint descriptor USBGEN_EP_NUM_INTF0_2|0x80, // Endpoint address USBGEN_EP_ATTRIBUTES_INTF0_2, // Endpoint Attributes DESC_CONFIG_WORD(USBGEN_EP_SIZE_INTF0), // Endpoint Size 32, // Endpoint Interval }; #else // Dual interface config /* Configuration 1 Descriptor */ ROM BYTE configDescriptor1[]={ //// CONFIG //// 0x09, // Size of this descriptor in bytes USB_DESCRIPTOR_CONFIGURATION, // CONFIGURATION descriptor type DESC_CONFIG_WORD(0x0037), // Total length of data for this cfg 2, // Number of interfaces in this cfg 1, // Index value of this configuration 0, // Configuration string index _DEFAULT | _SELF, // Attributes, see usb_device.h 50, // Max power consumption (2X mA) //// INTERFACE //// 0x09, // Interface descriptor size USB_DESCRIPTOR_INTERFACE, // Interface descriptor 0, // Interface Number 0, // Alternate Setting Number 2, // Number of endpoints in this intf 0x00, // Class code 0x00, // Subclass code 0x00, // Protocol code 4, // Interface string index //// ENDPOINT //// 0x07, // Endpoint descriptor size USB_DESCRIPTOR_ENDPOINT, // Endpoint descriptor USBGEN_EP_NUM_INTF0, // Endpoint address USBGEN_EP_ATTRIBUTES_INTF0, // Attributes DESC_CONFIG_WORD(USBGEN_EP_SIZE_INTF0), // Size USBGEN_EP_INTERVAL_INTF0, // Interval //// ENDPOINT //// 0x07, // Endpoint descriptor size USB_DESCRIPTOR_ENDPOINT, // Endpoint descriptor USBGEN_EP_NUM_INTF0|0x80, // Endpoint address USBGEN_EP_ATTRIBUTES_INTF0, // Attributes DESC_CONFIG_WORD(USBGEN_EP_SIZE_INTF0), // Size USBGEN_EP_INTERVAL_INTF0, // Interval //// INTERFACE //// 0x09, // Interface descriptor size USB_DESCRIPTOR_INTERFACE, // Interface descriptor 1, // Interface Number 0, // Alternate Setting Number 2, // Number of endpoints in this intf 0x00, // Class code 0x00, // Subclass code 0x00, // Protocol code 5, // Interface string index //// ENDPOINT //// 0x07, // Endpoint descriptor size USB_DESCRIPTOR_ENDPOINT, // Endpoint descriptor USBGEN_EP_NUM_INTF1, // Endpoint address USBGEN_EP_ATTRIBUTES_INTF1, // Attributes DESC_CONFIG_WORD(USBGEN_EP_SIZE_INTF1), // Size USBGEN_EP_INTERVAL_INTF1, // Interval //// ENDPOINT //// 0x07, // Endpoint descriptor size USB_DESCRIPTOR_ENDPOINT, // Endpoint descriptor USBGEN_EP_NUM_INTF1|0x80, // Endpoint address USBGEN_EP_ATTRIBUTES_INTF1, // Attributes DESC_CONFIG_WORD(USBGEN_EP_SIZE_INTF1), // Size USBGEN_EP_INTERVAL_INTF1, // Interval }; // Interface #0 String ROM struct { BYTE bLength; BYTE bDscType; WORD string[INTF0_STRING_LENGTH]; } sd4={sizeof(sd4),USB_DESCRIPTOR_STRING, {INTF0_STRING}}; // Interface #1 String ROM struct { BYTE bLength; BYTE bDscType; WORD string[INTF1_STRING_LENGTH]; } sd5={sizeof(sd5),USB_DESCRIPTOR_STRING, {INTF1_STRING}}; #endif //Array of configuration descriptors ROM BYTE *ROM USB_CD_Ptr[]= { (ROM BYTE *ROM)&configDescriptor1 }; // Language Code ROM struct { BYTE bLength; BYTE bDscType; WORD string[1]; } sd000={sizeof(sd000),USB_DESCRIPTOR_STRING,{0x0409}}; // Manufacturer String ROM struct { BYTE bLength; BYTE bDscType; WORD string[MANUFACTURER_STRING_LENGTH]; } sd1={sizeof(sd1),USB_DESCRIPTOR_STRING, {MANUFACTURER_STRING}}; // Product String ROM struct { BYTE bLength; BYTE bDscType; WORD string[PRODUCT_STRING_LENGTH]; } sd2={sizeof(sd2),USB_DESCRIPTOR_STRING, {PRODUCT_STRING}}; // Serial Number String ROM struct { BYTE bLength; BYTE bDscType; WORD string[SERIAL_NUMBER_LENGTH]; } sd3={sizeof(sd3),USB_DESCRIPTOR_STRING, {SERIAL_NUMBER}}; //Array of string descriptors ROM BYTE *ROM USB_SD_Ptr[]= { (ROM BYTE *ROM)&sd000, (ROM BYTE *ROM)&sd1, (ROM BYTE *ROM)&sd2, (ROM BYTE *ROM)&sd3, #if defined(DUAL_INTERFACE) (ROM BYTE *ROM)&sd4, (ROM BYTE *ROM)&sd5, #endif }; #endif /** EOF usb_descriptors.c ***************************************************/