61 lines
1.6 KiB
Text
61 lines
1.6 KiB
Text
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Serial Mouse Converter
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======================
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This makes old serial mouse into modern USB one.
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Tested by:
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- Microsoft green-eyed mouse
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- DELL mouse can work with DTR only.
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Pinout
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------
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DE-9 DB-25 DTE DCE Description
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----------------------------------------------------------------
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2 3 RXD TXD data from mouse
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3 2 TXD RXD used by mouse as power source?
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4 20 DTR DSR used by mouse as power source
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5 7 GND GND
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7 4 RTS CTS used by mouse as power source
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*DTE=Converter, DCE=Mouse
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## RS-232 Driver
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Microsoft mouse seems to need higher voltage for power source.
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SP3232E outputs only +-6V at charge pump output and didn't work.
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ADM232A works for both Microsoft and DELL.
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Microsoft green-eyed mouse requires both while DELL mouse can work with DTR only.
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## Wiring
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Mouse RXD, TXD, DTR and RTS should be wired to RS-232 driver.
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Wire up RS-232 driver charge pump output V+ to DTR and RTS for power source purpose.
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Connect Mouse TXD to AVR PD2(RXD) *through* RS-232 driver for mouse data.
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UART Setting
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------------
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defined in config.h.
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### Microsoft serial mouse
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1200 baud, 7-bit data, no parity, 1-bit stop, lsb-first
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### MouseSystems
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1200 baud, 8-bit data, no parity, 1-bit stop, lsb-first(Not tested)
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Resources
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---------
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Get power out of PC RS-232 port:
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https://www.epanorama.net/circuits/rspower.html
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Microsoft serial mouse:
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https://web.archive.org/web/20130307230349/www.kryslix.com/nsfaq/Q.12.html
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Serial Mice Protocols:
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https://roborooter.com/post/serial-mice/
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