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Windows implements the ReadFile system call as a blocking call. This means that the application program must wait for the read to complete before continuing. So it waits for the device driver to issue a URB, it waits while the TD_List is being built and sent, and it waits while the device is returning NAKs. Eventually the device will send data and the corresponding TD will be marked complete. This propagates all of the way up the stack and the application program can continue. The operation of an EZ-Host/EZ-OTG embedded host is similar.
The code implements the sequences and protocols as required by the USB specification. It is not all that exciting. You can change it if you really want to, using SCAN records, but I would not recommend that. It is more productive for you to put energy into your USB application. done_func = (PFNINTHANDLER) &lights_report_received; susb_receive ( SIE1, 2, &lights_report_info); } Figure 3-11. The CallBack routines needed for Example 3 Simple Example #4 – BAL Host Program Just as we did in the first example, double click on bash_env in the se3 directory to create a bash window.
In the next chapter, we will build a host application. 46 Chapter 4: Developing a host application Chapter 4: Developing a host application A USB host controller has more work to do than a USB device controller, a lot more. USB is a master-slave bus and the host, as master, will control all of the communications. This will involve detecting and identifying connected devices, and then scheduling USB transfers as defined by the requirements of each device. The structure of a host application program is the same as a device application program (refer to Figure 3-3) so we can focus on the functionality of our application program and allow Frameworks and BIOS to handle all of the low-level details of enumeration and scheduling.