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Chapter 6
6
6-6 MEMORY ALLOCATION
Memory allocation in the driver can be simplified by the use of memory allocation functions
available from μC/LIB. μC/LIB’s memory allocation functions provide allocation of memory
from dedicated memory space (e.g., USB RAM) or general purpose heap. The driver may
use the pool functionality offered by μC/LIB. Memory pools use fixed-sized blocks that can
be dynamically allocated and freed during application execution. Memory pools may be
convenient to manage objects needed by the driver. The objects could be for instance data
structures mandatory for DMA operations. For more information on using μC/LIB memory
allocation functions, consult the μC/LIB documentation.
6-7 CPU AND BOARD SUPPORT
The USB device stack supports big-endian and little-endian CPU architectures. The setup
packet received as part of a control transfer must provide the content of the setup packet in
little-endian format to the stack. Therefore, if the USB device controller provides the content
in big-endian format, device drivers must swap the endianness of the setup packet’s
content.
In order for device drivers to be platform-independent, it is necessary to provide a layer of
code that abstracts details such as clocks, interrupt controllers, general-purpose input/
output (GPIO) pins, and other hardware modules configuration. With this board support
package (BSP) code layer, it is possible for the majority of the USB device stack to be
independent of any specific hardware, and for device drivers to be reused on different
architectures and bus configurations without the need to modify stack or driver source
code. These procedures are also referred as the USB BSP for a particular development
board.
A sample device BSP interface API structure is shown below.
const
USBD_DRV_BSP_API
USBD_DrvBSP_<controller> = { USBD_BSP_Init,
USBD_BSP_Conn,
USBD_BSP_Disconn
(1)
(2)
(3)
};
Listing 6-7 Device BSP Interface API
88
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