Oki JOB60851 4-1-12. Device Descriptors

Chapter 4 Software Development

page 4-8

7SET_DESCRIPTOR Update or add a descriptor

8GET_CONFIGURATION Return the current device configuration value

9SET_CONFIGURATION Set the device configuration value

10 GET_INTERFACE Return the selected alternate setting for the specified interface

11 SET_INTERFACE Set the alternate setting for the specified interface

12 SYNCH_FRAME Set and report an endpoint's synchronization frame

4-1-12. Device Descriptors

When a USB device first connects to the bus, it reports its attributes to the host with a device

descriptor. Figure 4.1.3 illustrates the hierarchical structure of this data structure with the device

descriptor for a bidirectional printer.

Endpoint descriptors give the physical capabilities of the endpoints already discussed in Section

4.1.7 above.

Groups of endpoint descriptors form logical communications functions called interfaces. These

interfaces support alternate settings for changing the interface and thus device characteristics. Note

that these interfaces are mutually exclusive in that only one can be in use at any given time.

n Device

o Configuration #1

u Interface #1 alternate setting #0 ; output-only printer

¡ Endpoint #1 BulkOut

u Interface #1 alternate setting #1 ; bidirectional printer

¡ Endpoint #1 BulkOut

¡ Endpoint #2 BulkIn

u Interface #1 alternate setting #2 ; bidirectional printer

¡ Endpoint #1 BulkOut

¡ Endpoint #2 BulkIn

¡ Endpoint #3 InterruptIn ; Inform of data volumes by interrupt transfer

Figure 4.1.3. Device Descriptor for Bidirectional Printer

Higher up the hierarchy are the configuration and device layers. The same device can have multiple

configurations--drawing its power from the bus or its own local power supply, for example. It can

even start as a power-saving device and later switch to a high-consumption one.

The following are brief listings of descriptor contents. For detailed descriptions, refer to Section 9.4

of the USB version 1.1 specifications.

(1) Device descriptor

USB Specification release number in binary coded decimal

Device class code

Device subclass code

Protocol code

Maximum packet size for endpoint 0 (EP0)

Vendor and product IDs

Contents

Main Page OKI Contents 1. Introduction ............................................................................ 1-1 2. Putting Board through its Paces........................................... 2-1 3. System Specifications............................................................ 3-1 4. Software Development........................................................... 4-1 Page Page 1-1. Checking Packing List Page 1-3. Precaution for Safe and Proper Use Labels Warning Caution Icons Warning Caution Notation Page 2-1. Setup 2-1-1. Configuring JOB60851 Board 2-1-2. Installing Development Software 2-1-3. Connecting Board 2-2. Running Default Program 2-2-1. Installing USB Driver 2-2-2. Running Flash Memory Program Page 2-3. Running User Programs 2-3-1. Connecting Serial Cable 2-3-2. Loading Terminal Emulator 2-3-3. Synchronizing Link 2-3-4. Downloading and Executing 2-4. Overwriting Flash Memory Contents Page 3-1. System Components 3-1-1. System Objective 3-1-2. System Components 3-2. Hardware Specification 3-2-1. Connectors and Switches Page Page Page page 3-7 3-2-3. Parts List Tables 3.2.1 and 3.2.2 list the parts on the JOB60851 board. Table 3.2.1. Parts List (1/2) page 3-8 3-2-4. Memory Maps Figure 3.2.4. Memory Map for Download Mode Data Memory Program Memory Loader Mode 1 memory map ( Load_Sel/ = L ) ( EA/ = L ) Figure 3.2.5. Memory Map for Flash Execution Mode Data Memory Program Memory Loader Mode2 memory map ( Load_Sel/ = L ) ( EA/ = H ) Ext._SRAM Figure 3.2.6. Memory Map for Application Mode Data Memory AP Mode 1 memory map ( Load_Sel/ = H ) ( EA/ = L ) Ext._SRAM Ext._EPROM Figure 3.2.7. Memory Map for Flash Rewrite Mode Data Memory Program Memory AP Mode2 memory map ( Load_Sel/ = H ) ( EA/ = H ) Ext._SRAM 3-3. System Limitations 3-3-1. Resources Uses Table 3.3.1. MSM66Q573 Pin Assignments (2/2) Page 4-1. USB Basics 4-1-1. Bus Topology, Addresses, and Hot Plugging 4-1-2. Specification Documents 4-1-3. Core Specifications 4-1-4. Data Flow Types 4-1-5. Bus Transactions 4-1-6. Packets 4-1-7. Endpoints 4-1-8. Data Rates 4-1-9. Device Class Specifications 4-1-10. Device Requests 4-1-11. Standard Device Requests 4-1-12. Device Descriptors (2) Configuration descriptor (3) Interface descriptor (4) Endpoint descriptor Total size of this descriptor in bytes (5) String descriptor 4-2. Sample USB Firmware 4-2-1. Setup 4-2-2. Sample Firmware Specifications 4-2-3. Sample USB Host Software 4-2-4. Compiling and Executing Sample USB Firmware 4-2-5. Confirming USB Compliance with Usbcheck.exe Page 4-2-6. Creating USB Mouse Demo HID_MOUSE_ONLY one. 4-2-7. Modifying Application Layer Receive Only Skeleton Transmit Only Skeleton 4-2-8. Simple Debugging 4-2-9. Evaluating USB Equipment 4-3. USB Bits and Pieces 4-3-1. Device Controller Specifications 4-3-2. Overview of ML60851C Operation 4-3-3. Connecting Microcontroller to USB Controller Page 4-3-5. Building a Product 4-3-6. Vendor and Product IDs 4-3-7. Other Tools Necessary Products: Developer: 4-3-8. Note on Porting 4-3-9. Limitations 4-4. Port 7 LED2 Control 4-4-1. Port 7 Registers Port Mode Register (P7IO) Port Secondary Function Control Register (P7SF) 4-4-2. Changing LED2 Color Sample Port 7 Control Program 4-5. Standard I/O over Serial Link 4-5-1. JOB60851 Board Standard I/O 4.5.2 Serial Port Page 4-5-3. read() and write() Functions Page 4-5-4. Standard I/O Examples Sample Program Using Standard Output Sample Program Using Standard Input 4-5-5. Debugging with Standard I/O