USB Classes for Microcontrollers

USB : USB Classes USB Classes for Microcontrollers

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1 What Are USB Classes, Anyway?

2 USB Classes are organized by function

3 USB classes we won't be talking about

4 The commonly used USB classes

5 The "No Class" solution: generic classless bulk devices

6 What your customer sees, if you are lucky

7 If you are NOT so lucky...

8 Writing a protocol for your classless bulk or CDC device

9 Protocol Problems

10 CDC Devices:

11 The bad news about those "Fake Serial Port" chips

12 CDC devices waste USB bandwidth!

13 Why CDC devices waste bandwidth

14 Mass Storage Device (MSD) class

15 Mass Storage Devices are not always a good solution - part 1

16 Mass Storage Devices are not always a good solution - part 2

17 The MSD "drag and drop" trap - 1

18 The MSD "drag and drop" trap - 2

19 Human Interface Device (HID) class

20 What is HID Class Good For?

21 Completely self describing

22 HID class focuses on DATA ITEMS (variables)

23 HID data items are identified by Usages

24 HIDmaker takes HID data items a step further

25 The result: HIDmaker's unique Direct Transfer of Variables

26 HID: The most highly developed USB class

27 Plenty of Speed

28 HID class does not waste USB bandwidth

29 So what's the bad news about HID class devices?