USB Multi-Role Device Design by Example by John Hyde

By John Hyde

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Our first example will use the EZ-Host mezzanine board in standalone mode. Note that the EZ-OTG mezzanine board could also be used for this example, and it will produce identical results. Figure 3-5 shows key features of the mezzanine board. 34 Chapter 3: EZ-Host/EZ-OTG Development Environment +5 Volts SIE2 CPU SIE1 Figure 3-5. Key features of a mezzanine board We will attach the mezzanine board to our development system using a USB cable to SIE2. Note that all dip switches will be set to OFF. The BIOS contains a default USB device descriptor, and this will be used to enumerate a connection.

Frameworks also contains software subsystems to manage the hardware on the mezzanine boards – buttons, dipswitches, LEDs, and seven segment display. The Frameworks subsystem is built from the source files in the COMMON directory. Take a quick look into this directory and note that the common module list is very complete. Each module is designed around a CY16 capability, and individual features are contained within conditional compilation directives. You will not need to edit any files in this directory, but Frameworks is supplied in source format for those users who want to.

Sending URBs took us to TDs, which took us to scheduling and into the heart of the Frameworks 54 Chapter 4: Developing a host application host controller firmware. Notice in the URB structure (shown in Figure 4-4) that the caller specifies a callback routine that is used once the request is completed. The application programmer does not need to know any of these low-level details since the callback function will eventually be called. Device Identification Frameworks will use a series of URBs to enumerate the device.

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