Difference between revisions of "USB Control"

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The power of a personal computer can be leveraged to create pinball machine software with simple or complex rulesets, video sequences, and audio effects.  The PC's audio output can be connected directly to a pinball machine, but interfacing to the machine's switch and driver circuits and to display elements such as a dot matrix display requires an interface card such as a P-ROC.
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See: [[Hardware Control Systems]]
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=== Hardware Implementation ===
 
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The P-ROC has a type B USB connector allowing it to connect directly to a PC using a standard USB cable.  The USB signalling protocol is handled by an [http://www.ftdichip.com/ FTDI] [http://www.ftdichip.com/Products/FT245R.htm FT245RL] chip on the P-ROC.  This chip buffers incoming data destined for the FPGA and outgoing data being sent back to the PC.  For more information about the FT245RL chip, refer to its [http://www.ftdichip.com/Documents/DataSheets/DS_FT245R_V206.pdf datasheet].
 
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=== USB Drivers ===
 
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[http://www.ftdichip.com/ FTDI] provides a free, closed-source driver for the FT245RL chip called [http://www.ftdichip.com/Drivers/D2XX.htm D2XX].  P-ROCs have been verified to work successfully with Windows based systems using D2XX.  Attempts to communicate with a P-ROC in Mac OS using D2XX have been unsuccessful due to an apparent bug in the Mac OS D2XX implementation.
 
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A free, open-source driver called [http://www.intra2net.com/en/developer/libftdi/ libFTDI] is also available.  P-ROCs have been verified to work successfully in Linux and Mac based systems using libFTDi.
 
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=== USB Bandwidth ===
 
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The P-ROC can send/receive approximately 1 MB of data each second, which is more than enough to exchange any information needed to control a pinball machine, including DMD animation information at frame rates exceeding 60 fps.
 

Latest revision as of 23:03, 4 February 2016

See: Hardware Control Systems

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