Joystick Buttons

Lazycow · 26 May 2016, 09:37

Hi, I have problems querying the 2nd button in the joystick port...

Code:

    bclr    #5,d0
    move.w    $dff016,d1
    btst    #14,d1
    bne.s    .skip
    bset    #5,d0

It seems like the 2nd button is always pressed. The Hardware reference manual says that the pin for the 2nd button can be configured as input or output, maybe that has to be prepared first? (But I don't know how)

The 2nd button on the mouse port works. (btst #10,d1)

any hints?

meynaf · 26 May 2016, 11:47

Try this somewhere in the initialization of your program :

Code:

 move.w #$ff00,$dff034

How exactly it works, is still unclear to me.

Toni Wilen · 26 May 2016, 12:03

Yeah, proper button read requires output mode and IO data set to 1. This is explained in HRM.

Joystick and mouse button line is "floating" when not pressed, grounded when pressed. Output mode with data=1 simulates pullup resistor, pulling non-pressed logic state back to 1. (This is not dangerous, IO lines are designed for this) Without pullup button releases would not work.

Note that some 3rd party joypads and some mice have internal pullup resistor. They do work without output mode. This has caused lots of confusion..

Lazycow · 26 May 2016, 13:05

Ah, ok... the POTGO register! How did I miss that one?
(I just wonder why I have to set the pins to OUTPUT, when I actually want read something... yes, yes, you explained it...)
Anyway, it works! Excellent!

sandruzzo · 12 June 2016, 15:25

After first reading, it seems like 2nd buttos is allway pressed!

Issue resolved

26 May 2016, 11:47	#2
meynaf son of 68k Join Date: Nov 2007 Location: Lyon / France Age: 51 Posts: 5,323	Try this somewhere in the initialization of your program : Code: move.w #$ff00,$dff034 How exactly it works, is still unclear to me.

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26 May 2016, 09:37	#1
Lazycow Registered User Join Date: Oct 2014 Location: Germany Posts: 195	Joystick Buttons Hi, I have problems querying the 2nd button in the joystick port... Code: bclr #5,d0 move.w $dff016,d1 btst #14,d1 bne.s .skip bset #5,d0 It seems like the 2nd button is always pressed. The Hardware reference manual says that the pin for the 2nd button can be configured as input or output, maybe that has to be prepared first? (But I don't know how) The 2nd button on the mouse port works. (btst #10,d1) any hints?

26 May 2016, 12:03	#3
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,505	Yeah, proper button read requires output mode and IO data set to 1. This is explained in HRM. Joystick and mouse button line is "floating" when not pressed, grounded when pressed. Output mode with data=1 simulates pullup resistor, pulling non-pressed logic state back to 1. (This is not dangerous, IO lines are designed for this) Without pullup button releases would not work. Note that some 3rd party joypads and some mice have internal pullup resistor. They do work without output mode. This has caused lots of confusion..

26 May 2016, 13:05	#4
Lazycow Registered User Join Date: Oct 2014 Location: Germany Posts: 195	Ah, ok... the POTGO register! How did I miss that one? (I just wonder why I have to set the pins to OUTPUT, when I actually want read something... yes, yes, you explained it...) Anyway, it works! Excellent!

12 June 2016, 15:25	#5
sandruzzo Registered User Join Date: Feb 2011 Location: Italy/Rome Posts: 2,281	After first reading, it seems like 2nd buttos is allway pressed! Issue resolved Last edited by sandruzzo; 12 June 2016 at 16:08.

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