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Revision 3569, 1.2 kB
(checked in by smolik, 7 years ago)
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crorrection of czech documentation
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- Property svn:eol-style set to
native
- Property svn:keywords set to
Author Date Id Revision
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Primitive parallel port je driver pro i2c sbernici, ktera vyuziva vlastnosti |
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modernich obousmernych parallelnich portu. |
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U obousmernych portu jsou jednotlive bity zpojeny asi takto |
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/-----| R |
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--o| |-----| |
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cteni \-----| /------- Out pin |
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|/ |
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- -|\ |
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zapis V |
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--- |
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To znamena, ze pokud nastavime vystup do 1 muzeme z tohoto portu pohodlne cist. |
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Proto muzeme pouzit 2 piny parelelniho portu jako SDA a SCL pro i2c sbernici. |
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Nemusime proto pridavat zadne externi soucastky z jednoho portu muzeme |
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najednou cist i zapisovat. |
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Pouzivam pouze registr base+2 takze by melo jit pouzivat vsech 8 bitu datoveho |
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portu pro jinou aplikaci (ja mam pripojenou EEPROM + LCD display) . Nepouzivam |
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bit Enable Bi-Directional Port. Jedina nevyhoda je ,ze muzeme podporovat |
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jen 5V chipy. |
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Zapojeni: |
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Cann 25 pin. |
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SDA - pripojit na pin 14 ( Auto Linefeed) |
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SCL - pripojit na pin 16 (Initialize printer) |
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to je vse. |
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GND - pripojit na pin 18-25 |
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+5V - use external supply (I use 5V from 3.5" floppy connector) |
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no pullups requied |
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PARAMETRY modulu: |
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base=0xXXX |
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XXX - 278 nebo 378 |
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Daniel Smolik |
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marvin@sitour.cz |
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