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Bug 484 - Joystick button states fail to update
Summary: Joystick button states fail to update
Status: RESOLVED INVALID
Alias: None
Product: SDL
Classification: Unclassified
Component: joystick (show other bugs)
Version: HG 2.0
Hardware: x86 Windows (XP)
: P2 normal
Assignee: Ryan C. Gordon
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2007-08-28 11:45 UTC by Oskari Nyman
Modified: 2007-08-28 12:21 UTC (History)
0 users

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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.