AMC 68VZ328 software manual Programming Structure, Dimmio structure description

Programming Structure

The structure that should be used to store pin configuration and information is dimm_io from dimmio.h, located in /opt/uClinux/linux/include/linux/. Table 2 below describes the six fields of the structure and their settings.

Table 2: dimm_io structure description

Field	Description
	type - short
port_number	The port number corresponds to the ports of
	the MC68VZ328, where A = 0, B = 1, C =
	2, … L = 11, M = 12
	type - short
bit_number	The bit numbers are for each port, where 0 =
	lsb, … 7 = msb
	type - long
offset	This is the offset into the list of active pins.
	The offset has a maximum range of 0 to 26.
	type - unsigned char
mode	The mode determines the direction of the I/O
	point, where 0 = input, 1 = output
	type - unsigned char
	The state describes the logic level on the pin,
state	where 0 = low, 1 = highNote that the state
	field is not updated when an ioctl call is used
	and field exists only for programming
	convenience.
	type - unsigned char
pull_up_dn	The pull_up_dn controls the pull-up orpull-
	down register for each pin, where 0 =
	disabled, 1 = enabled

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