apb_target_de1_cl_inputs

Files
file	apb_target_timer.cdl
	Simple timer target for an APB bus.

Detailed Description

Modules

module apb_target_de1_cl_inputs::apb_target_de1_cl_inputs	(	clock	clk,
		input bit	reset_n,
		input t_apb_request	apb_request,
		output t_apb_response	apb_response,
		input t_de1_cl_user_inputs	user_inputs
	)

Parameters

[in]	clk	System clock
[in]	reset_n	Active low reset
[in]	apb_request	APB request
[out]	apb_response	APB response
[in]	user_inputs	This module provides an APB target to get the status of inputs for the Cambridge University DE1-SOC daughterboard.

The CL DE1-SOC daughterboard contains a joystick, a diamond of four buttons, two rotary dials, and apparently a temperature alarm and touchpanel intrerrupt (the latter two I have not used as yet).

Two registers are provided. The first is the state register,

Bits	Meaning
31	Inputs changed since last read of state
5;26	zero
25	temperature alarm
24	touchpanel interrupt
6;18	zero
17	right rotary dial is pressed in
16	left rotary dial is pressed in
3;13	zero
12	joystick is being pressed
11	joystick is being pushed right
10	joystick is being pushed left
9	joystick is being pushed down
8	joystick is being pushed up
4;4	zero
3	diamond y (top black button) is being pressed
2	diamond x (left blue button) is being pressed
1	diamond b (right red button) is being pressed
0	diamond a (bottom green button) is being pressed

The second register relates just to the rotary dials; the hardware keeps track of directional impulses to provide an 8-bit 'rotary value' for each dial.

Bits	Meaning
31	Inputs changed since last read of state
13;18	zero
17	right rotary dial is pressed in
16	left rotary dial is pressed in
8;8	right rotary dial position (decremented on anticlockwise, incremented on clockwise)
8;0	left rotary dial position (decremented on anticlockwise, incremented on clockwise)