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Modules Relationship
4
4-1 MODULES RELATIONSHIP
4-1-1 APPLICATION
Your application layer needs to provide configuration information to μC/USB-Device in the
form of four C files: app_cfg.h , usbd_cfg.h , usbd_dev_cfg.c and usbd_dev_cfg.h :
■
app_cfg.h is an application-specific configuration file. It contains #defines to specify
task priorities and the stack size of each of the task within the application and the task
required by μC/USB-Device. Some small Micriμm modules like μC/LIB (run-time
library) use app_cfg.h to configure parameters such as the heap size.
■
Configuration data in usbd_cfg.h consists of specifying the number of devices
supported in the stack, the maximum number of configurations, the maximum number
of interfaces and alternate interfaces, maximum number of opened endpoints per
device, class-specific configuration parameters and more. In all, there are approximately
20 #defines to set.
■
Finally, usbd_dev_cfg.c/.h consists of device-specific configuration requirements
such as vendor ID, product ID, device release number and its respective strings. It also
contains device controller specific configurations such as base address, dedicated
memory base address and size, and endpoint management table.
Refer to Chapter 5, “Configuration” on page 65 for more information on how to configure
μC/USB-Device.
4-1-2 LIBRARIES
Given that μC/USB-Device is designed to be used in safety critical applications, some of the
“standard” library functions such as strcpy() , memset() , etc. have been rewritten to
conform to the same quality standards as the rest of the USB device stack. All these standard
functions are part of a separate Micriμm’s product, μC/LIB. μC/USB-Device depends on this
product. In addition, some data objects in USB controller drivers are created at run-time
which implies the use of memory allocation from the heap function Mem_HeapAlloc() .
55
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