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-------------------------------------------------------------------------------
NES Gamepad signalling
-------------------------------------------------------------------------------
Synthetically generated NES gamepad signalling.
SPI settings are always:
Clock polarity = 1
Clock phase = 0
Bit order = msb-first
Word size = 8
Chip-select is not used and must not be assigned to any channel.
___
GND |o \
CUP |o o| VCC
OUT 0 |o o| D3
D1 |o o| D4
-----
NES Gamepad Connector
VCC - Power 5V
GND - Ground
CUP - Shift register clock (CLK)
OUT 0 - Shift register latch (optional)
D1 - Gamepad data (MISO)
D3 - Data (unused)
D4 - Data (unused)
Data pins D3 and D4 are not used by the standard game pad but by special
controllers like the Nintento Zapper light gun.
Logic analyzer setup
--------------------
The logic analyzer used was a DreamSourceLab DSLogic Plus (at 10 MHz):
Probe NES gamepad
-----------------------
0 OUT 0
1 D1
2 CUP
a.sr
----
Button press of button 'A'.
MISO bits: 01111111
MISO data: 7F
Button States: A
b.sr
----
Button press of button 'B'.
MISO bits: 10111111
MISO data: BF
Button States: B
select.sr
---------
Button press of button 'Select'.
MISO bits: 11011111
MISO data: DF
Button States: Select
start.sr
--------
Button press of button 'Start'.
MISO bits: 11101111
MISO data: EF
Button States: Start
north.sr
--------
Button press of button 'North'.
MISO bits: 11110111
MISO data: F7
Button States: North
south.sr
--------
Button press of button 'South'.
MISO bits: 11111011
MISO data: FB
Button States: South
west.sr
-------
Button press of button 'West'.
MISO bits: 11111101
MISO data: FD
Button States: West
east.sr
-------
Button press of button 'East'.
MISO bits: 11111110
MISO data: FE
Button States: East
a_b.sr
------
Button press of button 'A' and 'B'.
MISO bits: 00111111
MISO data: 3F
Button States: A + B
b_select_west.sr
----------------
Button press of button 'B' and 'Select' and 'West'.
MISO bits: 10011101
MISO data: 9D
Button States: B + Select + West
no_button.sr
------------
Controller connected but no button pressed.
MISO bits: 11111111
MISO data: FF
Button States: No button is pressed
unconnected.sr
--------------
Gamepad not connected.
MISO bits: 00000000
MISO data: 00
Button States: Gamepad is not connected.
|
