main
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Last change
on this file since 38a6d09 was 38a6d09, checked in by Adrien Destugues <pulkomandy@…>, 5 years ago |
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Initial work on GrIP2HID
Implements the GrIP protocol, with polling for now.
Next steps:
- Move to interrupts for the clock decoding (freeing the CPU for more
important work)
- Have 4 GrIP instances for each controller
- Implement USB-HID
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Property mode
set to
100644
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File size:
941 bytes
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| 1 | Gravis GrIP to HID adapter
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| 2 | ==========================
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| 3 |
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| 4 | GRiP is (or was?) a custom protocol designed by Gravis to allow their gamepad
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| 5 | to use more than 4 buttons on the PC joystick port. The Gravis Gamepad Pro is
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| 6 | one of the best PC gamepads ever manufactured, and the USB version is not that
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| 7 | common (and also looks less nice with the black plastic).
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| 8 |
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| 9 | This interface allows to use these gamepads on an USB port, for modern machines
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| 10 | where the traditional gameport is not available. It supports up to 4 gamepads
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| 11 | (2 gameports, each allowing to use 2 gamepads thanks to Gravis chaining system).
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| 12 |
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| 13 | It is powered by an AT90USB AVR microcontroller, because these implement USB in
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| 14 | hardware and have easily usable external interupts (PCINT) making it much easier
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| 15 | to implement the protocol (this helps because the gamepad is the master and
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| 16 | drives the clock).
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| 17 |
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| 18 | [Further reading on GrIP](http://pulkomandy.tk/_/_Electronique/_Gravis%20Interface%20Protocol)
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