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Bug 484

Summary: Joystick button states fail to update
Product: SDL Reporter: Oskari Nyman <asko>
Component: joystickAssignee: Ryan C. Gordon <icculus>
Status: RESOLVED INVALID QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.0   
Hardware: x86   
OS: Windows (XP)   

Description Oskari Nyman 2007-08-28 11:45:52 UTC 
Joystick button pushes are not detected for my USB joystick. It's probably a rare case, so before I scare you away, let me reveal the problem:

In /src/joystick/win32/SDL_mmjoystick.c, function SDL_SYS_JoystickUpdate()

JOYINFOEX joyinfo;
            ^
This struct should be zeroed out before using it, meaning:

ZeroMemory(&joyinfo, sizeof(joyinfo));

That fixes it.
Comment 1 Oskari Nyman 2007-08-28 12:21:39 UTC 
Seems this is not the problem after all. Instead my joystick seems to shift the button state bits in joyinfo.dwButtons by 4 bits to the left. Obviously it's a problem in the joystick itself (it's custom made).

Windows control panel seems to detect this though, and shows 4 extra buttons. But there's nothing in the device caps that would indicate it, so it's probably not worth fixing.