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Arcom Embedded Linux Technical Manual Developing software for AEL

The following table explains the functions provided by libdevmem (which are also

described in /opt/arcom/SYSTEM-TYPE/include/libdevmem.h):

Function Description

libdevmem_open

Maps a physical address into the current virtual address

space, returning a libdevmem_handle that serves as a

handle onto the mapping.

Takes the physical address to map and the length of the

region to map and returns.

Returns NULL on error and sets errno accordingly.

libdevmem_close

Unmaps an existing mapping.

Takes a handle as returned by libdevmem_close.

Returns 0 on success, –1 on error, and sets errno

accordingly.

libdevmem_read_TYPE

Reads a value from an offset within a mapping.

Takes a handle and an offset and returns a TYPE_t that is

the value that was read. TYPE may be one of uint8, uint16 or

uint32.

libdevmem_write_TYPE

Writes a value to an offset within a mapping.

Takes a handle, an offset and a TYPE_t that is the value to

write. TYPE may be one of uint8, uint16 or uint32.

An application that wishes to use libdevmem must include the libdevmem.h. It must also

include libdevmem when linking:

$ arm-linux-gcc –o application application.o -ldevmem

The library is currently available only as a static library.

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Eurotech ZEUS Manual de usuario Pagina 48