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65 lines
1.5 KiB
Markdown
65 lines
1.5 KiB
Markdown
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[← Home](../README.md) · [Devices](README.md)
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# gameport.device — Joystick and Mouse
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## Overview
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`gameport.device` reads joystick and mouse ports (active on port 1 for joystick, port 0 for mouse). Uses CIA and custom chip registers.
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---
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## Controller Types
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```c
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/* devices/gameport.h */
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#define GPCT_ALLOCATED -1 /* port is allocated */
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#define GPCT_NOCONTROLLER 0 /* nothing connected */
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#define GPCT_MOUSE 1 /* mouse */
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#define GPCT_RELJOYSTICK 2 /* relative joystick (proportional) */
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#define GPCT_ABSJOYSTICK 3 /* absolute joystick */
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```
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---
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## Reading a Joystick
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```c
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struct IOStdReq *gp = CreateStdIO(port);
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OpenDevice("gameport.device", 1, (struct IORequest *)gp, 0);
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/* Set controller type: */
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UBYTE type = GPCT_ABSJOYSTICK;
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gp->io_Command = GPD_SETCTYPE;
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gp->io_Data = &type;
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gp->io_Length = 1;
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DoIO((struct IORequest *)gp);
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/* Set trigger conditions: */
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struct GamePortTrigger trigger = {
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GPTF_UPKEYS | GPTF_DOWNKEYS, /* report buttons */
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10000, /* X delta timeout */
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10000, /* Y delta timeout */
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1, 1 /* X/Y delta threshold */
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};
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gp->io_Command = GPD_SETTRIGGER;
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gp->io_Data = &trigger;
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gp->io_Length = sizeof(trigger);
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DoIO((struct IORequest *)gp);
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/* Read events: */
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struct InputEvent ie;
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gp->io_Command = GPD_READEVENT;
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gp->io_Data = &ie;
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gp->io_Length = sizeof(ie);
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DoIO((struct IORequest *)gp);
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/* ie.ie_Code, ie.ie_position.ie_xy give button/direction */
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CloseDevice((struct IORequest *)gp);
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```
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---
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## References
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- NDK39: `devices/gameport.h`
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